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  *  <http://lapsus.berlios.de/asus_oled.html>.
  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 #define USB_VENDOR_ID_ASUS      0x0b05
  56 #define USB_DEVICE_ID_ASUS_LCM      0x1726
  57 #define USB_DEVICE_ID_ASUS_LCM2     0x175b
  58
  59 MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
  60 MODULE_DESCRIPTION("Asus OLED Driver v" ASUS_OLED_VERSION);
  61 MODULE_LICENSE("GPL");
  62
  63 static struct class *oled_class;
  64 static int oled_num;
  65
  66 static uint start_off;
  67
  68 module_param(start_off, uint, 0644);
  69
  70 MODULE_PARM_DESC(start_off,
  71                  "Set to 1 to switch off OLED display after it is attached");
  72
  73 enum oled_pack_mode {
  74         PACK_MODE_G1,
  75         PACK_MODE_G50,
  76         PACK_MODE_LAST
  77 };
  78
  79 struct oled_dev_desc_str {
  80         uint16_t                idVendor;
  81         uint16_t                idProduct;
  82         /* width of display */
  83         uint16_t                devWidth;
  84         /* formula to be used while packing the picture */
  85         enum oled_pack_mode     packMode;
  86         const char              *devDesc;
  87 };
  88
  89 /* table of devices that work with this driver */
  90 static const struct usb_device_id id_table[] = {
  91         /* Asus G1/G2 (and variants)*/
  92         { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM) },
  93         /* Asus G50V (and possibly others - G70? G71?)*/
  94         { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2) },
  95         { },
  96 };
  97
  98 /* parameters of specific devices */
  99 static struct oled_dev_desc_str oled_dev_desc_table[] = {
 100         { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM, 128, PACK_MODE_G1,
 101                 "G1/G2" },
 102         { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2, 256, PACK_MODE_G50,
 103                 "G50" },
 104         { },
 105 };
 106
 107 MODULE_DEVICE_TABLE(usb, id_table);
 108
 109 struct asus_oled_header {
 110         uint8_t         magic1;
 111         uint8_t         magic2;
 112         uint8_t         flags;
 113         uint8_t         value3;
 114         uint8_t         buffer1;
 115         uint8_t         buffer2;
 116         uint8_t         value6;
 117         uint8_t         value7;
 118         uint8_t         value8;
 119         uint8_t         padding2[7];
 120 } __attribute((packed));
 121
 122 struct asus_oled_packet {
 123         struct asus_oled_header         header;
 124         uint8_t                         bitmap[ASUS_OLED_PACKET_BUF_SIZE];
 125 } __attribute((packed));
 126
 127 struct asus_oled_dev {
 128         struct usb_device       *udev;
 129         uint8_t                 pic_mode;
 130         uint16_t                dev_width;
 131         enum oled_pack_mode     pack_mode;
 132         size_t                  height;
 133         size_t                  width;
 134         size_t                  x_shift;
 135         size_t                  y_shift;
 136         size_t                  buf_offs;
 137         uint8_t                 last_val;
 138         size_t                  buf_size;
 139         char                    *buf;
 140         uint8_t                 enabled;
 141         struct device           *dev;
 142 };
 143
 144 static void setup_packet_header(struct asus_oled_packet *packet, char flags,
 145                          char value3, char buffer1, char buffer2, char value6,
 146                          char value7, char value8)
 147 {
 148         memset(packet, 0, sizeof(struct asus_oled_header));
 149         packet->header.magic1 = 0x55;
 150         packet->header.magic2 = 0xaa;
 151         packet->header.flags = flags;
 152         packet->header.value3 = value3;
 153         packet->header.buffer1 = buffer1;
 154         packet->header.buffer2 = buffer2;
 155         packet->header.value6 = value6;
 156         packet->header.value7 = value7;
 157         packet->header.value8 = value8;
 158 }
 159
 160 static void enable_oled(struct asus_oled_dev *odev, uint8_t enabl)
 161 {
 162         int a;
 163         int retval;
 164         int act_len;
 165         struct asus_oled_packet *packet;
 166
 167         packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
 168
 169         if (!packet) {
 170                 dev_err(&odev->udev->dev, "out of memory\n");
 171                 return;
 172         }
 173
 174         setup_packet_header(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
 175
 176         if (enabl)
 177                 packet->bitmap[0] = 0xaf;
 178         else
 179                 packet->bitmap[0] = 0xae;
 180
 181         for (a = 0; a < 1; a++) {
 182                 retval = usb_bulk_msg(odev->udev,
 183                         usb_sndbulkpipe(odev->udev, 2),
 184                         packet,
 185                         sizeof(struct asus_oled_header) + 1,
 186                         &act_len,
 187                         -1);
 188
 189                 if (retval)
 190                         dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
 191         }
 192
 193         odev->enabled = enabl;
 194
 195         kfree(packet);
 196 }
 197
 198 static ssize_t set_enabled(struct device *dev, struct device_attribute *attr,
 199                            const char *buf, size_t count)
 200 {
 201         struct usb_interface *intf = to_usb_interface(dev);
 202         struct asus_oled_dev *odev = usb_get_intfdata(intf);
 203         unsigned long value;
 204         if (strict_strtoul(buf, 10, &value))
 205                 return -EINVAL;
 206
 207         enable_oled(odev, value);
 208
 209         return count;
 210 }
 211
 212 static ssize_t class_set_enabled(struct device *device,
 213                                  struct device_attribute *attr,
 214                                  const char *buf, size_t count)
 215 {
 216         struct asus_oled_dev *odev =
 217                 (struct asus_oled_dev *) dev_get_drvdata(device);
 218         unsigned long value;
 219
 220         if (strict_strtoul(buf, 10, &value))
 221                 return -EINVAL;
 222
 223         enable_oled(odev, value);
 224
 225         return count;
 226 }
 227
 228 static ssize_t get_enabled(struct device *dev, struct device_attribute *attr,
 229                            char *buf)
 230 {
 231         struct usb_interface *intf = to_usb_interface(dev);
 232         struct asus_oled_dev *odev = usb_get_intfdata(intf);
 233
 234         return sprintf(buf, "%d\n", odev->enabled);
 235 }
 236
 237 static ssize_t class_get_enabled(struct device *device,
 238                                  struct device_attribute *attr, char *buf)
 239 {
 240         struct asus_oled_dev *odev =
 241                 (struct asus_oled_dev *) dev_get_drvdata(device);
 242
 243         return sprintf(buf, "%d\n", odev->enabled);
 244 }
 245
 246 static void send_packets(struct usb_device *udev,
 247                          struct asus_oled_packet *packet,
 248                          char *buf, uint8_t p_type, size_t p_num)
 249 {
 250         size_t i;
 251         int act_len;
 252
 253         for (i = 0; i < p_num; i++) {
 254                 int retval;
 255
 256                 switch (p_type) {
 257                 case ASUS_OLED_ROLL:
 258                         setup_packet_header(packet, 0x40, 0x80, p_num,
 259                                             i + 1, 0x00, 0x01, 0xff);
 260                         break;
 261                 case ASUS_OLED_STATIC:
 262                         setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
 263                                             0x01, 0x00, 0x01, 0x00);
 264                         break;
 265                 case ASUS_OLED_FLASH:
 266                         setup_packet_header(packet, 0x10 + i, 0x80, 0x01,
 267                                             0x01, 0x00, 0x00, 0xff);
 268                         break;
 269                 }
 270
 271                 memcpy(packet->bitmap, buf + (ASUS_OLED_PACKET_BUF_SIZE*i),
 272                        ASUS_OLED_PACKET_BUF_SIZE);
 273
 274                 retval = usb_bulk_msg(udev, usb_sndctrlpipe(udev, 2),
 275                                       packet, sizeof(struct asus_oled_packet),
 276                                       &act_len, -1);
 277
 278                 if (retval)
 279                         dev_dbg(&udev->dev, "retval = %d\n", retval);
 280         }
 281 }
 282
 283 static void send_packet(struct usb_device *udev,
 284                         struct asus_oled_packet *packet,
 285                         size_t offset, size_t len, char *buf, uint8_t b1,
 286                         uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5,
 287                         uint8_t b6) {
 288         int retval;
 289         int act_len;
 290
 291         setup_packet_header(packet, b1, b2, b3, b4, b5, b6, 0x00);
 292         memcpy(packet->bitmap, buf + offset, len);
 293
 294         retval = usb_bulk_msg(udev,
 295                               usb_sndctrlpipe(udev, 2),
 296                               packet,
 297                               sizeof(struct asus_oled_packet),
 298                               &act_len,
 299                               -1);
 300
 301         if (retval)
 302                 dev_dbg(&udev->dev, "retval = %d\n", retval);
 303 }
 304
 305
 306 static void send_packets_g50(struct usb_device *udev,
 307                              struct asus_oled_packet *packet, char *buf)
 308 {
 309         send_packet(udev, packet,     0, 0x100, buf,
 310                     0x10, 0x00, 0x02, 0x01, 0x00, 0x01);
 311         send_packet(udev, packet, 0x100, 0x080, buf,
 312                     0x10, 0x00, 0x02, 0x02, 0x80, 0x00);
 313
 314         send_packet(udev, packet, 0x180, 0x100, buf,
 315                     0x11, 0x00, 0x03, 0x01, 0x00, 0x01);
 316         send_packet(udev, packet, 0x280, 0x100, buf,
 317                     0x11, 0x00, 0x03, 0x02, 0x00, 0x01);
 318         send_packet(udev, packet, 0x380, 0x080, buf,
 319                     0x11, 0x00, 0x03, 0x03, 0x80, 0x00);
 320 }
 321
 322
 323 static void send_data(struct asus_oled_dev *odev)
 324 {
 325         size_t packet_num = odev->buf_size / ASUS_OLED_PACKET_BUF_SIZE;
 326         struct asus_oled_packet *packet;
 327
 328         packet = kzalloc(sizeof(struct asus_oled_packet), GFP_KERNEL);
 329
 330         if (!packet) {
 331                 dev_err(&odev->udev->dev, "out of memory\n");
 332                 return;
 333         }
 334
 335         if (odev->pack_mode == PACK_MODE_G1) {
 336                 /* When sending roll-mode data the display updated only
 337                    first packet.  I have no idea why, but when static picture
 338                    is sent just before rolling picture everything works fine. */
 339                 if (odev->pic_mode == ASUS_OLED_ROLL)
 340                         send_packets(odev->udev, packet, odev->buf,
 341                                      ASUS_OLED_STATIC, 2);
 342
 343                 /* Only ROLL mode can use more than 2 packets.*/
 344                 if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
 345                         packet_num = 2;
 346
 347                 send_packets(odev->udev, packet, odev->buf,
 348                              odev->pic_mode, packet_num);
 349         } else if (odev->pack_mode == PACK_MODE_G50) {
 350                 send_packets_g50(odev->udev, packet, odev->buf);
 351         }
 352
 353         kfree(packet);
 354 }
 355
 356 static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
 357 {
 358         odev->last_val = val;
 359
 360         if (val == 0) {
 361                 odev->buf_offs += count;
 362                 return 0;
 363         }
 364
 365         while (count-- > 0) {
 366                 size_t x = odev->buf_offs % odev->width;
 367                 size_t y = odev->buf_offs / odev->width;
 368                 size_t i;
 369
 370                 x += odev->x_shift;
 371                 y += odev->y_shift;
 372
 373                 switch (odev->pack_mode) {
 374                 case PACK_MODE_G1:
 375                         /* i = (x/128)*640 + 127 - x + (y/8)*128;
 376                            This one for 128 is the same, but might be better
 377                            for different widths? */
 378                         i = (x/odev->dev_width)*640 +
 379                                 odev->dev_width - 1 - x +
 380                                 (y/8)*odev->dev_width;
 381                         break;
 382
 383                 case PACK_MODE_G50:
 384                         i =  (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
 385                         break;
 386
 387                 default:
 388                         i = 0;
 389                         printk(ASUS_OLED_ERROR "Unknown OLED Pack Mode: %d!\n",
 390                                odev->pack_mode);
 391                         break;
 392                 }
 393
 394                 if (i >= odev->buf_size) {
 395                         printk(ASUS_OLED_ERROR "Buffer overflow! Report a bug:"
 396                                "offs: %d >= %d i: %d (x: %d y: %d)\n",
 397                                (int) odev->buf_offs, (int) odev->buf_size,
 398                                (int) i, (int) x, (int) y);
 399                         return -EIO;
 400                 }
 401
 402                 switch (odev->pack_mode) {
 403                 case PACK_MODE_G1:
 404                         odev->buf[i] &= ~(1<<(y%8));
 405                         break;
 406
 407                 case PACK_MODE_G50:
 408                         odev->buf[i] &= ~(1<<(x%8));
 409                         break;
 410
 411                 default:
 412                         /* cannot get here; stops gcc complaining*/
 413                         ;
 414                 }
 415
 416                 odev->buf_offs++;
 417         }
 418
 419         return 0;
 420 }
 421
 422 static ssize_t odev_set_picture(struct asus_oled_dev *odev,
 423                                 const char *buf, size_t count)
 424 {
 425         size_t offs = 0, max_offs;
 426
 427         if (count < 1)
 428                 return 0;
 429
 430         if (tolower(buf[0]) == 'b') {
 431                 /* binary mode, set the entire memory*/
 432
 433                 size_t i;
 434
 435                 odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
 436
 437                 kfree(odev->buf);
 438                 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 439                 if (odev->buf == NULL) {
 440                         odev->buf_size = 0;
 441                         printk(ASUS_OLED_ERROR "Out of memory!\n");
 442                         return -ENOMEM;
 443                 }
 444
 445                 memset(odev->buf, 0xff, odev->buf_size);
 446
 447                 for (i = 1; i < count && i <= 32 * 32; i++) {
 448                         odev->buf[i-1] = buf[i];
 449                         odev->buf_offs = i-1;
 450                 }
 451
 452                 odev->width = odev->dev_width / 8;
 453                 odev->height = ASUS_OLED_DISP_HEIGHT;
 454                 odev->x_shift = 0;
 455                 odev->y_shift = 0;
 456                 odev->last_val =  0;
 457
 458                 send_data(odev);
 459
 460                 return count;
 461         }
 462
 463         if (buf[0] == '<') {
 464                 size_t i;
 465                 size_t w = 0, h = 0;
 466                 size_t w_mem, h_mem;
 467
 468                 if (count < 10 || buf[2] != ':')
 469                         goto error_header;
 470
 471
 472                 switch (tolower(buf[1])) {
 473                 case ASUS_OLED_STATIC:
 474                 case ASUS_OLED_ROLL:
 475                 case ASUS_OLED_FLASH:
 476                         odev->pic_mode = buf[1];
 477                         break;
 478                 default:
 479                         printk(ASUS_OLED_ERROR "Wrong picture mode: '%c'.\n",
 480                                buf[1]);
 481                         return -EIO;
 482                         break;
 483                 }
 484
 485                 for (i = 3; i < count; ++i) {
 486                         if (buf[i] >= '0' && buf[i] <= '9') {
 487                                 w = 10*w + (buf[i] - '0');
 488
 489                                 if (w > ASUS_OLED_MAX_WIDTH)
 490                                         goto error_width;
 491                         } else if (tolower(buf[i]) == 'x') {
 492                                 break;
 493                         } else {
 494                                 goto error_width;
 495                         }
 496                 }
 497
 498                 for (++i; i < count; ++i) {
 499                         if (buf[i] >= '0' && buf[i] <= '9') {
 500                                 h = 10*h + (buf[i] - '0');
 501
 502                                 if (h > ASUS_OLED_DISP_HEIGHT)
 503                                         goto error_height;
 504                         } else if (tolower(buf[i]) == '>') {
 505                                 break;
 506                         } else {
 507                                 goto error_height;
 508                         }
 509                 }
 510
 511                 if (w < 1 || w > ASUS_OLED_MAX_WIDTH)
 512                         goto error_width;
 513
 514                 if (h < 1 || h > ASUS_OLED_DISP_HEIGHT)
 515                         goto error_height;
 516
 517                 if (i >= count || buf[i] != '>')
 518                         goto error_header;
 519
 520                 offs = i+1;
 521
 522                 if (w % (odev->dev_width) != 0)
 523                         w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
 524                 else
 525                         w_mem = w;
 526
 527                 if (h < ASUS_OLED_DISP_HEIGHT)
 528                         h_mem = ASUS_OLED_DISP_HEIGHT;
 529                 else
 530                         h_mem = h;
 531
 532                 odev->buf_size = w_mem * h_mem / 8;
 533
 534                 kfree(odev->buf);
 535                 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 536
 537                 if (odev->buf == NULL) {
 538                         odev->buf_size = 0;
 539                         printk(ASUS_OLED_ERROR "Out of memory!\n");
 540                         return -ENOMEM;
 541                 }
 542
 543                 memset(odev->buf, 0xff, odev->buf_size);
 544
 545                 odev->buf_offs = 0;
 546                 odev->width = w;
 547                 odev->height = h;
 548                 odev->x_shift = 0;
 549                 odev->y_shift = 0;
 550                 odev->last_val = 0;
 551
 552                 if (odev->pic_mode == ASUS_OLED_FLASH) {
 553                         if (h < ASUS_OLED_DISP_HEIGHT/2)
 554                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
 555                 } else {
 556                         if (h < ASUS_OLED_DISP_HEIGHT)
 557                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
 558                 }
 559
 560                 if (w < (odev->dev_width))
 561                         odev->x_shift = ((odev->dev_width) - w)/2;
 562         }
 563
 564         max_offs = odev->width * odev->height;
 565
 566         while (offs < count && odev->buf_offs < max_offs) {
 567                 int ret = 0;
 568
 569                 if (buf[offs] == '1' || buf[offs] == '#') {
 570                         ret = append_values(odev, 1, 1);
 571                         if (ret < 0)
 572                                 return ret;
 573                 } else if (buf[offs] == '0' || buf[offs] == ' ') {
 574                         ret = append_values(odev, 0, 1);
 575                         if (ret < 0)
 576                                 return ret;
 577                 } else if (buf[offs] == '\n') {
 578                         /* New line detected. Lets assume, that all characters
 579                            till the end of the line were equal to the last
 580                            character in this line.*/
 581                         if (odev->buf_offs % odev->width != 0)
 582                                 ret = append_values(odev, odev->last_val,
 583                                                     odev->width -
 584                                                     (odev->buf_offs %
 585                                                      odev->width));
 586                         if (ret < 0)
 587                                 return ret;
 588                 }
 589
 590                 offs++;
 591         }
 592
 593         if (odev->buf_offs >= max_offs)
 594                 send_data(odev);
 595
 596         return count;
 597
 598 error_width:
 599         printk(ASUS_OLED_ERROR "Wrong picture width specified.\n");
 600         return -EIO;
 601
 602 error_height:
 603         printk(ASUS_OLED_ERROR "Wrong picture height specified.\n");
 604         return -EIO;
 605
 606 error_header:
 607         printk(ASUS_OLED_ERROR "Wrong picture header.\n");
 608         return -EIO;
 609 }
 610
 611 static ssize_t set_picture(struct device *dev, struct device_attribute *attr,
 612                            const char *buf, size_t count)
 613 {
 614         struct usb_interface *intf = to_usb_interface(dev);
 615
 616         return odev_set_picture(usb_get_intfdata(intf), buf, count);
 617 }
 618
 619 static ssize_t class_set_picture(struct device *device,
 620                                  struct device_attribute *attr,
 621                                  const char *buf, size_t count)
 622 {
 623         return odev_set_picture((struct asus_oled_dev *)
 624                                 dev_get_drvdata(device), buf, count);
 625 }
 626
 627 #define ASUS_OLED_DEVICE_ATTR(_file)            dev_attr_asus_oled_##_file
 628
 629 static DEVICE_ATTR(asus_oled_enabled, S_IWUSR | S_IRUGO,
 630                    get_enabled, set_enabled);
 631 static DEVICE_ATTR(asus_oled_picture, S_IWUSR , NULL, set_picture);
 632
 633 static DEVICE_ATTR(enabled, S_IWUSR | S_IRUGO,
 634                    class_get_enabled, class_set_enabled);
 635 static DEVICE_ATTR(picture, S_IWUSR, NULL, class_set_picture);
 636
 637 static int asus_oled_probe(struct usb_interface *interface,
 638                            const struct usb_device_id *id)
 639 {
 640         struct usb_device *udev = interface_to_usbdev(interface);
 641         struct asus_oled_dev *odev = NULL;
 642         int retval = -ENOMEM;
 643         uint16_t dev_width = 0;
 644         enum oled_pack_mode pack_mode = PACK_MODE_LAST;
 645         const struct oled_dev_desc_str *dev_desc = oled_dev_desc_table;
 646         const char *desc = NULL;
 647
 648         if (!id) {
 649                 /* Even possible? Just to make sure...*/
 650                 dev_err(&interface->dev, "No usb_device_id provided!\n");
 651                 return -ENODEV;
 652         }
 653
 654         for (; dev_desc->idVendor; dev_desc++) {
 655                 if (dev_desc->idVendor == id->idVendor
 656                     && dev_desc->idProduct == id->idProduct) {
 657                         dev_width = dev_desc->devWidth;
 658                         desc = dev_desc->devDesc;
 659                         pack_mode = dev_desc->packMode;
 660                         break;
 661                 }
 662         }
 663
 664         if (!desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
 665                 dev_err(&interface->dev,
 666                         "Missing or incomplete device description!\n");
 667                 return -ENODEV;
 668         }
 669
 670         odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
 671
 672         if (odev == NULL) {
 673                 dev_err(&interface->dev, "Out of memory\n");
 674                 return -ENOMEM;
 675         }
 676
 677         odev->udev = usb_get_dev(udev);
 678         odev->pic_mode = ASUS_OLED_STATIC;
 679         odev->dev_width = dev_width;
 680         odev->pack_mode = pack_mode;
 681         odev->height = 0;
 682         odev->width = 0;
 683         odev->x_shift = 0;
 684         odev->y_shift = 0;
 685         odev->buf_offs = 0;
 686         odev->buf_size = 0;
 687         odev->last_val = 0;
 688         odev->buf = NULL;
 689         odev->enabled = 1;
 690         odev->dev = NULL;
 691
 692         usb_set_intfdata(interface, odev);
 693
 694         retval = device_create_file(&interface->dev,
 695                                     &ASUS_OLED_DEVICE_ATTR(enabled));
 696         if (retval)
 697                 goto err_files;
 698
 699         retval = device_create_file(&interface->dev,
 700                                     &ASUS_OLED_DEVICE_ATTR(picture));
 701         if (retval)
 702                 goto err_files;
 703
 704         odev->dev = device_create(oled_class, &interface->dev, MKDEV(0, 0),
 705                                   NULL, "oled_%d", ++oled_num);
 706
 707         if (IS_ERR(odev->dev)) {
 708                 retval = PTR_ERR(odev->dev);
 709                 goto err_files;
 710         }
 711
 712         dev_set_drvdata(odev->dev, odev);
 713
 714         retval = device_create_file(odev->dev, &dev_attr_enabled);
 715         if (retval)
 716                 goto err_class_enabled;
 717
 718         retval = device_create_file(odev->dev, &dev_attr_picture);
 719         if (retval)
 720                 goto err_class_picture;
 721
 722         dev_info(&interface->dev,
 723                  "Attached Asus OLED device: %s [width %u, pack_mode %d]\n",
 724                  desc, odev->dev_width, odev->pack_mode);
 725
 726         if (start_off)
 727                 enable_oled(odev, 0);
 728
 729         return 0;
 730
 731 err_class_picture:
 732         device_remove_file(odev->dev, &dev_attr_picture);
 733
 734 err_class_enabled:
 735         device_remove_file(odev->dev, &dev_attr_enabled);
 736         device_unregister(odev->dev);
 737
 738 err_files:
 739         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
 740         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
 741
 742         usb_set_intfdata(interface, NULL);
 743         usb_put_dev(odev->udev);
 744         kfree(odev);
 745
 746         return retval;
 747 }
 748
 749 static void asus_oled_disconnect(struct usb_interface *interface)
 750 {
 751         struct asus_oled_dev *odev;
 752
 753         odev = usb_get_intfdata(interface);
 754         usb_set_intfdata(interface, NULL);
 755
 756         device_remove_file(odev->dev, &dev_attr_picture);
 757         device_remove_file(odev->dev, &dev_attr_enabled);
 758         device_unregister(odev->dev);
 759
 760         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
 761         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
 762
 763         usb_put_dev(odev->udev);
 764
 765         kfree(odev->buf);
 766
 767         kfree(odev);
 768
 769         dev_info(&interface->dev, "Disconnected Asus OLED device\n");
 770 }
 771
 772 static struct usb_driver oled_driver = {
 773         .name =         ASUS_OLED_NAME,
 774         .probe =        asus_oled_probe,
 775         .disconnect =   asus_oled_disconnect,
 776         .id_table =     id_table,
 777 };
 778
 779 static CLASS_ATTR_STRING(version, S_IRUGO,
 780                         ASUS_OLED_UNDERSCORE_NAME " " ASUS_OLED_VERSION);
 781
 782 static int __init asus_oled_init(void)
 783 {
 784         int retval = 0;
 785         oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
 786
 787         if (IS_ERR(oled_class)) {
 788                 err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
 789                 return PTR_ERR(oled_class);
 790         }
 791
 792         retval = class_create_file(oled_class, &class_attr_version.attr);
 793         if (retval) {
 794                 err("Error creating class version file");
 795                 goto error;
 796         }
 797
 798         retval = usb_register(&oled_driver);
 799
 800         if (retval) {
 801                 err("usb_register failed. Error number %d", retval);
 802                 goto error;
 803         }
 804
 805         return retval;
 806
 807 error:
 808         class_destroy(oled_class);
 809         return retval;
 810 }
 811
 812 static void __exit asus_oled_exit(void)
 813 {
 814         usb_deregister(&oled_driver);
 815         class_remove_file(oled_class, &class_attr_version.attr);
 816         class_destroy(oled_class);
 817 }
 818
 819 module_init(asus_oled_init);
 820 module_exit(asus_oled_exit);
 821