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