Pileus Git - ~andy/linux/blob - drivers/staging/asus_oled/asus_oled.c

   1 /*
   2  *  Asus OLED USB driver
   3  *
   4  *  Copyright (C) 2007,2008 Jakub Schmidtke (sjakub@gmail.com)
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  *
  22  *
  23  *  This module is based on usbled and asus-laptop modules.
  24  *
  25  *
  26  *  Asus OLED support is based on asusoled program taken from
  27  *  <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_STATIC                's'
  46 #define ASUS_OLED_ROLL                  'r'
  47 #define ASUS_OLED_FLASH                 'f'
  48
  49 #define ASUS_OLED_MAX_WIDTH             1792
  50 #define ASUS_OLED_DISP_HEIGHT           32
  51 #define ASUS_OLED_PACKET_BUF_SIZE       256
  52
  53 #define USB_VENDOR_ID_ASUS      0x0b05
  54 #define USB_DEVICE_ID_ASUS_LCM      0x1726
  55 #define USB_DEVICE_ID_ASUS_LCM2     0x175b
  56
  57 MODULE_AUTHOR("Jakub Schmidtke, sjakub@gmail.com");
  58 MODULE_DESCRIPTION("Asus OLED Driver");
  59 MODULE_LICENSE("GPL");
  60 MODULE_VERSION(ASUS_OLED_VERSION);
  61
  62 static struct class *oled_class;
  63 static int oled_num;
  64
  65 static uint start_off;
  66
  67 module_param(start_off, uint, 0644);
  68
  69 MODULE_PARM_DESC(start_off,
  70                  "Set to 1 to switch off OLED display after it is attached");
  71
  72 enum oled_pack_mode {
  73         PACK_MODE_G1,
  74         PACK_MODE_G50,
  75         PACK_MODE_LAST
  76 };
  77
  78 struct oled_dev_desc_str {
  79         uint16_t                idVendor;
  80         uint16_t                idProduct;
  81         /* width of display */
  82         uint16_t                devWidth;
  83         /* formula to be used while packing the picture */
  84         enum oled_pack_mode     packMode;
  85         const char              *devDesc;
  86 };
  87
  88 /* table of devices that work with this driver */
  89 static const struct usb_device_id id_table[] = {
  90         /* Asus G1/G2 (and variants)*/
  91         { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM) },
  92         /* Asus G50V (and possibly others - G70? G71?)*/
  93         { USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2) },
  94         { },
  95 };
  96
  97 /* parameters of specific devices */
  98 static struct oled_dev_desc_str oled_dev_desc_table[] = {
  99         { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM, 128, PACK_MODE_G1,
 100                 "G1/G2" },
 101         { USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_LCM2, 256, PACK_MODE_G50,
 102                 "G50" },
 103         { },
 104 };
 105
 106 MODULE_DEVICE_TABLE(usb, id_table);
 107
 108 struct asus_oled_header {
 109         uint8_t         magic1;
 110         uint8_t         magic2;
 111         uint8_t         flags;
 112         uint8_t         value3;
 113         uint8_t         buffer1;
 114         uint8_t         buffer2;
 115         uint8_t         value6;
 116         uint8_t         value7;
 117         uint8_t         value8;
 118         uint8_t         padding2[7];
 119 } __attribute((packed));
 120
 121 struct asus_oled_packet {
 122         struct asus_oled_header         header;
 123         uint8_t                         bitmap[ASUS_OLED_PACKET_BUF_SIZE];
 124 } __attribute((packed));
 125
 126 struct asus_oled_dev {
 127         struct usb_device       *udev;
 128         uint8_t                 pic_mode;
 129         uint16_t                dev_width;
 130         enum oled_pack_mode     pack_mode;
 131         size_t                  height;
 132         size_t                  width;
 133         size_t                  x_shift;
 134         size_t                  y_shift;
 135         size_t                  buf_offs;
 136         uint8_t                 last_val;
 137         size_t                  buf_size;
 138         char                    *buf;
 139         uint8_t                 enabled;
 140         uint8_t                 enabled_post_resume;
 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         if (!packet)
 168                 return;
 169
 170         setup_packet_header(packet, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00);
 171
 172         if (enabl)
 173                 packet->bitmap[0] = 0xaf;
 174         else
 175                 packet->bitmap[0] = 0xae;
 176
 177         retval = usb_bulk_msg(odev->udev,
 178                 usb_sndbulkpipe(odev->udev, 2),
 179                 packet,
 180                 sizeof(struct asus_oled_header) + 1,
 181                 &act_len,
 182                 -1);
 183
 184         if (retval)
 185                 dev_dbg(&odev->udev->dev, "retval = %d\n", retval);
 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 (kstrtoul(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 (kstrtoul(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         if (!packet)
 324                 return;
 325
 326         if (odev->pack_mode == PACK_MODE_G1) {
 327                 /* When sending roll-mode data the display updated only
 328                    first packet.  I have no idea why, but when static picture
 329                    is sent just before rolling picture everything works fine. */
 330                 if (odev->pic_mode == ASUS_OLED_ROLL)
 331                         send_packets(odev->udev, packet, odev->buf,
 332                                      ASUS_OLED_STATIC, 2);
 333
 334                 /* Only ROLL mode can use more than 2 packets.*/
 335                 if (odev->pic_mode != ASUS_OLED_ROLL && packet_num > 2)
 336                         packet_num = 2;
 337
 338                 send_packets(odev->udev, packet, odev->buf,
 339                              odev->pic_mode, packet_num);
 340         } else if (odev->pack_mode == PACK_MODE_G50) {
 341                 send_packets_g50(odev->udev, packet, odev->buf);
 342         }
 343
 344         kfree(packet);
 345 }
 346
 347 static int append_values(struct asus_oled_dev *odev, uint8_t val, size_t count)
 348 {
 349         odev->last_val = val;
 350
 351         if (val == 0) {
 352                 odev->buf_offs += count;
 353                 return 0;
 354         }
 355
 356         while (count-- > 0) {
 357                 size_t x = odev->buf_offs % odev->width;
 358                 size_t y = odev->buf_offs / odev->width;
 359                 size_t i;
 360
 361                 x += odev->x_shift;
 362                 y += odev->y_shift;
 363
 364                 switch (odev->pack_mode) {
 365                 case PACK_MODE_G1:
 366                         /* i = (x/128)*640 + 127 - x + (y/8)*128;
 367                            This one for 128 is the same, but might be better
 368                            for different widths? */
 369                         i = (x/odev->dev_width)*640 +
 370                                 odev->dev_width - 1 - x +
 371                                 (y/8)*odev->dev_width;
 372                         break;
 373
 374                 case PACK_MODE_G50:
 375                         i =  (odev->dev_width - 1 - x)/8 + y*odev->dev_width/8;
 376                         break;
 377
 378                 default:
 379                         i = 0;
 380                         dev_err(odev->dev, "Unknown OLED Pack Mode: %d!\n",
 381                                odev->pack_mode);
 382                         break;
 383                 }
 384
 385                 if (i >= odev->buf_size) {
 386                         dev_err(odev->dev, "Buffer overflow! Report a bug:"
 387                                "offs: %d >= %d i: %d (x: %d y: %d)\n",
 388                                (int) odev->buf_offs, (int) odev->buf_size,
 389                                (int) i, (int) x, (int) y);
 390                         return -EIO;
 391                 }
 392
 393                 switch (odev->pack_mode) {
 394                 case PACK_MODE_G1:
 395                         odev->buf[i] &= ~(1<<(y%8));
 396                         break;
 397
 398                 case PACK_MODE_G50:
 399                         odev->buf[i] &= ~(1<<(x%8));
 400                         break;
 401
 402                 default:
 403                         /* cannot get here; stops gcc complaining*/
 404                         ;
 405                 }
 406
 407                 odev->buf_offs++;
 408         }
 409
 410         return 0;
 411 }
 412
 413 static ssize_t odev_set_picture(struct asus_oled_dev *odev,
 414                                 const char *buf, size_t count)
 415 {
 416         size_t offs = 0, max_offs;
 417
 418         if (count < 1)
 419                 return 0;
 420
 421         if (tolower(buf[0]) == 'b') {
 422                 /* binary mode, set the entire memory*/
 423
 424                 size_t i;
 425
 426                 odev->buf_size = (odev->dev_width * ASUS_OLED_DISP_HEIGHT) / 8;
 427
 428                 kfree(odev->buf);
 429                 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 430                 if (odev->buf == NULL) {
 431                         odev->buf_size = 0;
 432                         dev_err(odev->dev, "Out of memory!\n");
 433                         return -ENOMEM;
 434                 }
 435
 436                 memset(odev->buf, 0xff, odev->buf_size);
 437
 438                 for (i = 1; i < count && i <= 32 * 32; i++) {
 439                         odev->buf[i-1] = buf[i];
 440                         odev->buf_offs = i-1;
 441                 }
 442
 443                 odev->width = odev->dev_width / 8;
 444                 odev->height = ASUS_OLED_DISP_HEIGHT;
 445                 odev->x_shift = 0;
 446                 odev->y_shift = 0;
 447                 odev->last_val =  0;
 448
 449                 send_data(odev);
 450
 451                 return count;
 452         }
 453
 454         if (buf[0] == '<') {
 455                 size_t i;
 456                 size_t w = 0, h = 0;
 457                 size_t w_mem, h_mem;
 458
 459                 if (count < 10 || buf[2] != ':')
 460                         goto error_header;
 461
 462
 463                 switch (tolower(buf[1])) {
 464                 case ASUS_OLED_STATIC:
 465                 case ASUS_OLED_ROLL:
 466                 case ASUS_OLED_FLASH:
 467                         odev->pic_mode = buf[1];
 468                         break;
 469                 default:
 470                         dev_err(odev->dev, "Wrong picture mode: '%c'.\n",
 471                                buf[1]);
 472                         return -EIO;
 473                         break;
 474                 }
 475
 476                 for (i = 3; i < count; ++i) {
 477                         if (buf[i] >= '0' && buf[i] <= '9') {
 478                                 w = 10*w + (buf[i] - '0');
 479
 480                                 if (w > ASUS_OLED_MAX_WIDTH)
 481                                         goto error_width;
 482                         } else if (tolower(buf[i]) == 'x') {
 483                                 break;
 484                         } else {
 485                                 goto error_width;
 486                         }
 487                 }
 488
 489                 for (++i; i < count; ++i) {
 490                         if (buf[i] >= '0' && buf[i] <= '9') {
 491                                 h = 10*h + (buf[i] - '0');
 492
 493                                 if (h > ASUS_OLED_DISP_HEIGHT)
 494                                         goto error_height;
 495                         } else if (tolower(buf[i]) == '>') {
 496                                 break;
 497                         } else {
 498                                 goto error_height;
 499                         }
 500                 }
 501
 502                 if (w < 1 || w > ASUS_OLED_MAX_WIDTH)
 503                         goto error_width;
 504
 505                 if (h < 1 || h > ASUS_OLED_DISP_HEIGHT)
 506                         goto error_height;
 507
 508                 if (i >= count || buf[i] != '>')
 509                         goto error_header;
 510
 511                 offs = i+1;
 512
 513                 if (w % (odev->dev_width) != 0)
 514                         w_mem = (w/(odev->dev_width) + 1)*(odev->dev_width);
 515                 else
 516                         w_mem = w;
 517
 518                 if (h < ASUS_OLED_DISP_HEIGHT)
 519                         h_mem = ASUS_OLED_DISP_HEIGHT;
 520                 else
 521                         h_mem = h;
 522
 523                 odev->buf_size = w_mem * h_mem / 8;
 524
 525                 kfree(odev->buf);
 526                 odev->buf = kmalloc(odev->buf_size, GFP_KERNEL);
 527
 528                 if (odev->buf == NULL) {
 529                         odev->buf_size = 0;
 530                         dev_err(odev->dev, "Out of memory!\n");
 531                         return -ENOMEM;
 532                 }
 533
 534                 memset(odev->buf, 0xff, odev->buf_size);
 535
 536                 odev->buf_offs = 0;
 537                 odev->width = w;
 538                 odev->height = h;
 539                 odev->x_shift = 0;
 540                 odev->y_shift = 0;
 541                 odev->last_val = 0;
 542
 543                 if (odev->pic_mode == ASUS_OLED_FLASH) {
 544                         if (h < ASUS_OLED_DISP_HEIGHT/2)
 545                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT/2 - h)/2;
 546                 } else {
 547                         if (h < ASUS_OLED_DISP_HEIGHT)
 548                                 odev->y_shift = (ASUS_OLED_DISP_HEIGHT - h)/2;
 549                 }
 550
 551                 if (w < (odev->dev_width))
 552                         odev->x_shift = ((odev->dev_width) - w)/2;
 553         }
 554
 555         max_offs = odev->width * odev->height;
 556
 557         while (offs < count && odev->buf_offs < max_offs) {
 558                 int ret = 0;
 559
 560                 if (buf[offs] == '1' || buf[offs] == '#') {
 561                         ret = append_values(odev, 1, 1);
 562                         if (ret < 0)
 563                                 return ret;
 564                 } else if (buf[offs] == '0' || buf[offs] == ' ') {
 565                         ret = append_values(odev, 0, 1);
 566                         if (ret < 0)
 567                                 return ret;
 568                 } else if (buf[offs] == '\n') {
 569                         /* New line detected. Lets assume, that all characters
 570                            till the end of the line were equal to the last
 571                            character in this line.*/
 572                         if (odev->buf_offs % odev->width != 0)
 573                                 ret = append_values(odev, odev->last_val,
 574                                                     odev->width -
 575                                                     (odev->buf_offs %
 576                                                      odev->width));
 577                         if (ret < 0)
 578                                 return ret;
 579                 }
 580
 581                 offs++;
 582         }
 583
 584         if (odev->buf_offs >= max_offs)
 585                 send_data(odev);
 586
 587         return count;
 588
 589 error_width:
 590         dev_err(odev->dev, "Wrong picture width specified.\n");
 591         return -EIO;
 592
 593 error_height:
 594         dev_err(odev->dev, "Wrong picture height specified.\n");
 595         return -EIO;
 596
 597 error_header:
 598         dev_err(odev->dev, "Wrong picture header.\n");
 599         return -EIO;
 600 }
 601
 602 static ssize_t set_picture(struct device *dev, struct device_attribute *attr,
 603                            const char *buf, size_t count)
 604 {
 605         struct usb_interface *intf = to_usb_interface(dev);
 606
 607         return odev_set_picture(usb_get_intfdata(intf), buf, count);
 608 }
 609
 610 static ssize_t class_set_picture(struct device *device,
 611                                  struct device_attribute *attr,
 612                                  const char *buf, size_t count)
 613 {
 614         return odev_set_picture((struct asus_oled_dev *)
 615                                 dev_get_drvdata(device), buf, count);
 616 }
 617
 618 #define ASUS_OLED_DEVICE_ATTR(_file)            dev_attr_asus_oled_##_file
 619
 620 static DEVICE_ATTR(asus_oled_enabled, S_IWUSR | S_IRUGO,
 621                    get_enabled, set_enabled);
 622 static DEVICE_ATTR(asus_oled_picture, S_IWUSR , NULL, set_picture);
 623
 624 static DEVICE_ATTR(enabled, S_IWUSR | S_IRUGO,
 625                    class_get_enabled, class_set_enabled);
 626 static DEVICE_ATTR(picture, S_IWUSR, NULL, class_set_picture);
 627
 628 static int asus_oled_probe(struct usb_interface *interface,
 629                            const struct usb_device_id *id)
 630 {
 631         struct usb_device *udev = interface_to_usbdev(interface);
 632         struct asus_oled_dev *odev = NULL;
 633         int retval = -ENOMEM;
 634         uint16_t dev_width = 0;
 635         enum oled_pack_mode pack_mode = PACK_MODE_LAST;
 636         const struct oled_dev_desc_str *dev_desc = oled_dev_desc_table;
 637         const char *desc = NULL;
 638
 639         if (!id) {
 640                 /* Even possible? Just to make sure...*/
 641                 dev_err(&interface->dev, "No usb_device_id provided!\n");
 642                 return -ENODEV;
 643         }
 644
 645         for (; dev_desc->idVendor; dev_desc++) {
 646                 if (dev_desc->idVendor == id->idVendor
 647                     && dev_desc->idProduct == id->idProduct) {
 648                         dev_width = dev_desc->devWidth;
 649                         desc = dev_desc->devDesc;
 650                         pack_mode = dev_desc->packMode;
 651                         break;
 652                 }
 653         }
 654
 655         if (!desc || dev_width < 1 || pack_mode == PACK_MODE_LAST) {
 656                 dev_err(&interface->dev,
 657                         "Missing or incomplete device description!\n");
 658                 return -ENODEV;
 659         }
 660
 661         odev = kzalloc(sizeof(struct asus_oled_dev), GFP_KERNEL);
 662         if (odev == NULL)
 663                 return -ENOMEM;
 664
 665         odev->udev = usb_get_dev(udev);
 666         odev->pic_mode = ASUS_OLED_STATIC;
 667         odev->dev_width = dev_width;
 668         odev->pack_mode = pack_mode;
 669         odev->height = 0;
 670         odev->width = 0;
 671         odev->x_shift = 0;
 672         odev->y_shift = 0;
 673         odev->buf_offs = 0;
 674         odev->buf_size = 0;
 675         odev->last_val = 0;
 676         odev->buf = NULL;
 677         odev->enabled = 1;
 678         odev->dev = NULL;
 679
 680         usb_set_intfdata(interface, odev);
 681
 682         retval = device_create_file(&interface->dev,
 683                                     &ASUS_OLED_DEVICE_ATTR(enabled));
 684         if (retval)
 685                 goto err_files;
 686
 687         retval = device_create_file(&interface->dev,
 688                                     &ASUS_OLED_DEVICE_ATTR(picture));
 689         if (retval)
 690                 goto err_files;
 691
 692         odev->dev = device_create(oled_class, &interface->dev, MKDEV(0, 0),
 693                                   NULL, "oled_%d", ++oled_num);
 694
 695         if (IS_ERR(odev->dev)) {
 696                 retval = PTR_ERR(odev->dev);
 697                 goto err_files;
 698         }
 699
 700         dev_set_drvdata(odev->dev, odev);
 701
 702         retval = device_create_file(odev->dev, &dev_attr_enabled);
 703         if (retval)
 704                 goto err_class_enabled;
 705
 706         retval = device_create_file(odev->dev, &dev_attr_picture);
 707         if (retval)
 708                 goto err_class_picture;
 709
 710         dev_info(&interface->dev,
 711                  "Attached Asus OLED device: %s [width %u, pack_mode %d]\n",
 712                  desc, odev->dev_width, odev->pack_mode);
 713
 714         if (start_off)
 715                 enable_oled(odev, 0);
 716
 717         return 0;
 718
 719 err_class_picture:
 720         device_remove_file(odev->dev, &dev_attr_picture);
 721
 722 err_class_enabled:
 723         device_remove_file(odev->dev, &dev_attr_enabled);
 724         device_unregister(odev->dev);
 725
 726 err_files:
 727         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
 728         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
 729
 730         usb_set_intfdata(interface, NULL);
 731         usb_put_dev(odev->udev);
 732         kfree(odev);
 733
 734         return retval;
 735 }
 736
 737 static void asus_oled_disconnect(struct usb_interface *interface)
 738 {
 739         struct asus_oled_dev *odev;
 740
 741         odev = usb_get_intfdata(interface);
 742         usb_set_intfdata(interface, NULL);
 743
 744         device_remove_file(odev->dev, &dev_attr_picture);
 745         device_remove_file(odev->dev, &dev_attr_enabled);
 746         device_unregister(odev->dev);
 747
 748         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(picture));
 749         device_remove_file(&interface->dev, &ASUS_OLED_DEVICE_ATTR(enabled));
 750
 751         usb_put_dev(odev->udev);
 752
 753         kfree(odev->buf);
 754
 755         kfree(odev);
 756
 757         dev_info(&interface->dev, "Disconnected Asus OLED device\n");
 758 }
 759
 760 #ifdef CONFIG_PM
 761 static int asus_oled_suspend(struct usb_interface *intf, pm_message_t message)
 762 {
 763         struct asus_oled_dev *odev;
 764
 765         odev = usb_get_intfdata(intf);
 766         if (!odev)
 767                 return -ENODEV;
 768
 769         odev->enabled_post_resume = odev->enabled;
 770         enable_oled(odev, 0);
 771
 772         return 0;
 773 }
 774
 775 static int asus_oled_resume(struct usb_interface *intf)
 776 {
 777         struct asus_oled_dev *odev;
 778
 779         odev = usb_get_intfdata(intf);
 780         if (!odev)
 781                 return -ENODEV;
 782
 783         enable_oled(odev, odev->enabled_post_resume);
 784
 785         return 0;
 786 }
 787 #else
 788 #define asus_oled_suspend NULL
 789 #define asus_oled_resume NULL
 790 #endif
 791
 792 static struct usb_driver oled_driver = {
 793         .name =         ASUS_OLED_NAME,
 794         .probe =        asus_oled_probe,
 795         .disconnect =   asus_oled_disconnect,
 796         .id_table =     id_table,
 797         .suspend =      asus_oled_suspend,
 798         .resume =       asus_oled_resume,
 799 };
 800
 801 static CLASS_ATTR_STRING(version, S_IRUGO,
 802                         ASUS_OLED_UNDERSCORE_NAME " " ASUS_OLED_VERSION);
 803
 804 static int __init asus_oled_init(void)
 805 {
 806         int retval = 0;
 807         oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
 808
 809         if (IS_ERR(oled_class)) {
 810                 pr_err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class\n");
 811                 return PTR_ERR(oled_class);
 812         }
 813
 814         retval = class_create_file(oled_class, &class_attr_version.attr);
 815         if (retval) {
 816                 pr_err("Error creating class version file\n");
 817                 goto error;
 818         }
 819
 820         retval = usb_register(&oled_driver);
 821
 822         if (retval) {
 823                 pr_err("usb_register failed. Error number %d\n", retval);
 824                 goto error;
 825         }
 826
 827         return retval;
 828
 829 error:
 830         class_destroy(oled_class);
 831         return retval;
 832 }
 833
 834 static void __exit asus_oled_exit(void)
 835 {
 836         usb_deregister(&oled_driver);
 837         class_remove_file(oled_class, &class_attr_version.attr);
 838         class_destroy(oled_class);
 839 }
 840
 841 module_init(asus_oled_init);
 842 module_exit(asus_oled_exit);
 843