drivers/parport/parport_serial.c

   1 /*
   2  * Support for common PCI multi-I/O cards (which is most of them)
   3  *
   4  * Copyright (C) 2001  Tim Waugh <twaugh@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  *
  12  * Multi-function PCI cards are supposed to present separate logical
  13  * devices on the bus.  A common thing to do seems to be to just use
  14  * one logical device with lots of base address registers for both
  15  * parallel ports and serial ports.  This driver is for dealing with
  16  * that.
  17  *
  18  */
  19
  20 #include <linux/types.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/pci.h>
  24 #include <linux/parport.h>
  25 #include <linux/parport_pc.h>
  26 #include <linux/serial.h>
  27 #include <linux/serialP.h>
  28 #include <linux/list.h>
  29 #include <linux/8250_pci.h>
  30
  31 #include <asm/serial.h>
  32
  33 enum parport_pc_pci_cards {
  34         titan_110l = 0,
  35         titan_210l,
  36         netmos_9xx5_combo,
  37         avlab_1s1p,
  38         avlab_1s1p_650,
  39         avlab_1s1p_850,
  40         avlab_1s2p,
  41         avlab_1s2p_650,
  42         avlab_1s2p_850,
  43         avlab_2s1p,
  44         avlab_2s1p_650,
  45         avlab_2s1p_850,
  46         siig_1s1p_10x,
  47         siig_2s1p_10x,
  48         siig_2p1s_20x,
  49         siig_1s1p_20x,
  50         siig_2s1p_20x,
  51 };
  52
  53 /* each element directly indexed from enum list, above */
  54 struct parport_pc_pci {
  55         int numports;
  56         struct { /* BAR (base address registers) numbers in the config
  57                     space header */
  58                 int lo;
  59                 int hi; /* -1 if not there, >6 for offset-method (max
  60                            BAR is 6) */
  61         } addr[4];
  62
  63         /* If set, this is called immediately after pci_enable_device.
  64          * If it returns non-zero, no probing will take place and the
  65          * ports will not be used. */
  66         int (*preinit_hook) (struct pci_dev *pdev, struct parport_pc_pci *card,
  67                                 int autoirq, int autodma);
  68
  69         /* If set, this is called after probing for ports.  If 'failed'
  70          * is non-zero we couldn't use any of the ports. */
  71         void (*postinit_hook) (struct pci_dev *pdev,
  72                                 struct parport_pc_pci *card, int failed);
  73 };
  74
  75 static int __devinit netmos_parallel_init(struct pci_dev *dev, struct parport_pc_pci *card, int autoirq, int autodma)
  76 {
  77         /*
  78          * Netmos uses the subdevice ID to indicate the number of parallel
  79          * and serial ports.  The form is 0x00PS, where <P> is the number of
  80          * parallel ports and <S> is the number of serial ports.
  81          */
  82         card->numports = (dev->subsystem_device & 0xf0) >> 4;
  83         return 0;
  84 }
  85
  86 static struct parport_pc_pci cards[] __devinitdata = {
  87         /* titan_110l */                { 1, { { 3, -1 }, } },
  88         /* titan_210l */                { 1, { { 3, -1 }, } },
  89         /* netmos_9xx5_combo */         { 1, { { 2, -1 }, }, netmos_parallel_init },
  90         /* avlab_1s1p     */            { 1, { { 1, 2}, } },
  91         /* avlab_1s1p_650 */            { 1, { { 1, 2}, } },
  92         /* avlab_1s1p_850 */            { 1, { { 1, 2}, } },
  93         /* avlab_1s2p     */            { 2, { { 1, 2}, { 3, 4 },} },
  94         /* avlab_1s2p_650 */            { 2, { { 1, 2}, { 3, 4 },} },
  95         /* avlab_1s2p_850 */            { 2, { { 1, 2}, { 3, 4 },} },
  96         /* avlab_2s1p     */            { 1, { { 2, 3}, } },
  97         /* avlab_2s1p_650 */            { 1, { { 2, 3}, } },
  98         /* avlab_2s1p_850 */            { 1, { { 2, 3}, } },
  99         /* siig_1s1p_10x */             { 1, { { 3, 4 }, } },
 100         /* siig_2s1p_10x */             { 1, { { 4, 5 }, } },
 101         /* siig_2p1s_20x */             { 2, { { 1, 2 }, { 3, 4 }, } },
 102         /* siig_1s1p_20x */             { 1, { { 1, 2 }, } },
 103         /* siig_2s1p_20x */             { 1, { { 2, 3 }, } },
 104 };
 105
 106 static struct pci_device_id parport_serial_pci_tbl[] = {
 107         /* PCI cards */
 108         { PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_110L,
 109           PCI_ANY_ID, PCI_ANY_ID, 0, 0, titan_110l },
 110         { PCI_VENDOR_ID_TITAN, PCI_DEVICE_ID_TITAN_210L,
 111           PCI_ANY_ID, PCI_ANY_ID, 0, 0, titan_210l },
 112         { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9735,
 113           PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9xx5_combo },
 114         { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9745,
 115           PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9xx5_combo },
 116         { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9835,
 117           PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9xx5_combo },
 118         { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9835,
 119           PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9xx5_combo },
 120         { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9845,
 121           PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9xx5_combo },
 122         { PCI_VENDOR_ID_NETMOS, PCI_DEVICE_ID_NETMOS_9855,
 123           PCI_ANY_ID, PCI_ANY_ID, 0, 0, netmos_9xx5_combo },
 124         /* PCI_VENDOR_ID_AVLAB/Intek21 has another bunch of cards ...*/
 125         { 0x14db, 0x2110, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_1s1p},
 126         { 0x14db, 0x2111, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_1s1p_650},
 127         { 0x14db, 0x2112, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_1s1p_850},
 128         { 0x14db, 0x2140, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_1s2p},
 129         { 0x14db, 0x2141, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_1s2p_650},
 130         { 0x14db, 0x2142, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_1s2p_850},
 131         { 0x14db, 0x2160, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_2s1p},
 132         { 0x14db, 0x2161, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_2s1p_650},
 133         { 0x14db, 0x2162, PCI_ANY_ID, PCI_ANY_ID, 0, 0, avlab_2s1p_850},
 134         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S1P_10x_550,
 135           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_1s1p_10x },
 136         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S1P_10x_650,
 137           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_1s1p_10x },
 138         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S1P_10x_850,
 139           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_1s1p_10x },
 140         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S1P_10x_550,
 141           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2s1p_10x },
 142         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S1P_10x_650,
 143           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2s1p_10x },
 144         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S1P_10x_850,
 145           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2s1p_10x },
 146         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2P1S_20x_550,
 147           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2p1s_20x },
 148         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2P1S_20x_650,
 149           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2p1s_20x },
 150         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2P1S_20x_850,
 151           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2p1s_20x },
 152         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S1P_20x_550,
 153           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2s1p_20x },
 154         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S1P_20x_650,
 155           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_1s1p_20x },
 156         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_1S1P_20x_850,
 157           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_1s1p_20x },
 158         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S1P_20x_550,
 159           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2s1p_20x },
 160         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S1P_20x_650,
 161           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2s1p_20x },
 162         { PCI_VENDOR_ID_SIIG, PCI_DEVICE_ID_SIIG_2S1P_20x_850,
 163           PCI_ANY_ID, PCI_ANY_ID, 0, 0, siig_2s1p_20x },
 164
 165         { 0, } /* terminate list */
 166 };
 167 MODULE_DEVICE_TABLE(pci,parport_serial_pci_tbl);
 168
 169 struct pci_board_no_ids {
 170         int flags;
 171         int num_ports;
 172         int base_baud;
 173         int uart_offset;
 174         int reg_shift;
 175         int (*init_fn)(struct pci_dev *dev, struct pci_board_no_ids *board,
 176                         int enable);
 177         int first_uart_offset;
 178 };
 179
 180 static int __devinit siig10x_init_fn(struct pci_dev *dev, struct pci_board_no_ids *board, int enable)
 181 {
 182         return pci_siig10x_fn(dev, enable);
 183 }
 184
 185 static int __devinit siig20x_init_fn(struct pci_dev *dev, struct pci_board_no_ids *board, int enable)
 186 {
 187         return pci_siig20x_fn(dev, enable);
 188 }
 189
 190 static int __devinit netmos_serial_init(struct pci_dev *dev, struct pci_board_no_ids *board, int enable)
 191 {
 192         board->num_ports = dev->subsystem_device & 0xf;
 193         return 0;
 194 }
 195
 196 static struct pci_board_no_ids pci_boards[] __devinitdata = {
 197         /*
 198          * PCI Flags, Number of Ports, Base (Maximum) Baud Rate,
 199          * Offset to get to next UART's registers,
 200          * Register shift to use for memory-mapped I/O,
 201          * Initialization function, first UART offset
 202          */
 203
 204 // Cards not tested are marked n/t
 205 // If you have one of these cards and it works for you, please tell me..
 206
 207 /* titan_110l */        { SPCI_FL_BASE1 | SPCI_FL_BASE_TABLE, 1, 921600 },
 208 /* titan_210l */        { SPCI_FL_BASE1 | SPCI_FL_BASE_TABLE, 2, 921600 },
 209 /* netmos_9xx5_combo */ { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200, 0, 0, netmos_serial_init },
 210 /* avlab_1s1p (n/t) */  { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200 },
 211 /* avlab_1s1p_650 (nt)*/{ SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200 },
 212 /* avlab_1s1p_850 (nt)*/{ SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200 },
 213 /* avlab_1s2p (n/t) */  { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200 },
 214 /* avlab_1s2p_650 (nt)*/{ SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200 },
 215 /* avlab_1s2p_850 (nt)*/{ SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 1, 115200 },
 216 /* avlab_2s1p (n/t) */  { SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 2, 115200 },
 217 /* avlab_2s1p_650 (nt)*/{ SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 2, 115200 },
 218 /* avlab_2s1p_850 (nt)*/{ SPCI_FL_BASE0 | SPCI_FL_BASE_TABLE, 2, 115200 },
 219 /* siig_1s1p_10x */     { SPCI_FL_BASE2, 1, 460800, 0, 0, siig10x_init_fn },
 220 /* siig_2s1p_10x */     { SPCI_FL_BASE2, 1, 921600, 0, 0, siig10x_init_fn },
 221 /* siig_2p1s_20x */     { SPCI_FL_BASE0, 1, 921600, 0, 0, siig20x_init_fn },
 222 /* siig_1s1p_20x */     { SPCI_FL_BASE0, 1, 921600, 0, 0, siig20x_init_fn },
 223 /* siig_2s1p_20x */     { SPCI_FL_BASE0, 1, 921600, 0, 0, siig20x_init_fn },
 224 };
 225
 226 struct parport_serial_private {
 227         int num_ser;
 228         int line[20];
 229         struct pci_board_no_ids ser;
 230         int num_par;
 231         struct parport *port[PARPORT_MAX];
 232         struct parport_pc_pci par;
 233 };
 234
 235 static int __devinit get_pci_port (struct pci_dev *dev,
 236                                    struct pci_board_no_ids *board,
 237                                    struct serial_struct *req,
 238                                    int idx)
 239 {
 240         unsigned long port;
 241         int base_idx;
 242         int max_port;
 243         int offset;
 244
 245         base_idx = SPCI_FL_GET_BASE(board->flags);
 246         if (board->flags & SPCI_FL_BASE_TABLE)
 247                 base_idx += idx;
 248
 249         if (board->flags & SPCI_FL_REGION_SZ_CAP) {
 250                 max_port = pci_resource_len(dev, base_idx) / 8;
 251                 if (idx >= max_port)
 252                         return 1;
 253         }
 254
 255         offset = board->first_uart_offset;
 256
 257         /* Timedia/SUNIX uses a mixture of BARs and offsets */
 258         /* Ugh, this is ugly as all hell --- TYT */
 259         if(dev->vendor == PCI_VENDOR_ID_TIMEDIA )  /* 0x1409 */
 260                 switch(idx) {
 261                         case 0: base_idx=0;
 262                                 break;
 263                         case 1: base_idx=0; offset=8;
 264                                 break;
 265                         case 2: base_idx=1;
 266                                 break;
 267                         case 3: base_idx=1; offset=8;
 268                                 break;
 269                         case 4: /* BAR 2*/
 270                         case 5: /* BAR 3 */
 271                         case 6: /* BAR 4*/
 272                         case 7: base_idx=idx-2; /* BAR 5*/
 273                 }
 274
 275         port =  pci_resource_start(dev, base_idx) + offset;
 276
 277         if ((board->flags & SPCI_FL_BASE_TABLE) == 0)
 278                 port += idx * (board->uart_offset ? board->uart_offset : 8);
 279
 280         if (pci_resource_flags (dev, base_idx) & IORESOURCE_IO) {
 281                 int high_bits_offset = ((sizeof(long)-sizeof(int))*8);
 282                 req->port = port;
 283                 if (high_bits_offset)
 284                         req->port_high = port >> high_bits_offset;
 285                 else
 286                         req->port_high = 0;
 287                 return 0;
 288         }
 289         req->io_type = SERIAL_IO_MEM;
 290         req->iomem_base = ioremap(port, board->uart_offset);
 291         req->iomem_reg_shift = board->reg_shift;
 292         req->port = 0;
 293         return req->iomem_base ? 0 : 1;
 294 }
 295
 296 /* Register the serial port(s) of a PCI card. */
 297 static int __devinit serial_register (struct pci_dev *dev,
 298                                       const struct pci_device_id *id)
 299 {
 300         struct pci_board_no_ids *board;
 301         struct parport_serial_private *priv = pci_get_drvdata (dev);
 302         struct serial_struct serial_req;
 303         int base_baud;
 304         int k;
 305         int success = 0;
 306
 307         priv->ser = pci_boards[id->driver_data];
 308         board = &priv->ser;
 309         if (board->init_fn && ((board->init_fn) (dev, board, 1) != 0))
 310                 return 1;
 311
 312         base_baud = board->base_baud;
 313         if (!base_baud)
 314                 base_baud = BASE_BAUD;
 315         memset (&serial_req, 0, sizeof (serial_req));
 316
 317         for (k = 0; k < board->num_ports; k++) {
 318                 int line;
 319
 320                 if (priv->num_ser == ARRAY_SIZE (priv->line)) {
 321                         printk (KERN_WARNING
 322                                 "parport_serial: %s: only %u serial lines "
 323                                 "supported (%d reported)\n", pci_name (dev),
 324                                 ARRAY_SIZE (priv->line), board->num_ports);
 325                         break;
 326                 }
 327
 328                 serial_req.irq = dev->irq;
 329                 if (get_pci_port (dev, board, &serial_req, k))
 330                         break;
 331                 serial_req.flags = ASYNC_SKIP_TEST | ASYNC_AUTOPROBE;
 332                 serial_req.baud_base = base_baud;
 333                 line = register_serial (&serial_req);
 334                 if (line < 0) {
 335                         printk (KERN_DEBUG
 336                                 "parport_serial: register_serial failed\n");
 337                         continue;
 338                 }
 339                 priv->line[priv->num_ser++] = line;
 340                 success = 1;
 341         }
 342
 343         return success ? 0 : 1;
 344 }
 345
 346 /* Register the parallel port(s) of a PCI card. */
 347 static int __devinit parport_register (struct pci_dev *dev,
 348                                        const struct pci_device_id *id)
 349 {
 350         struct parport_pc_pci *card;
 351         struct parport_serial_private *priv = pci_get_drvdata (dev);
 352         int i = id->driver_data, n;
 353         int success = 0;
 354
 355         priv->par = cards[id->driver_data];
 356         card = &priv->par;
 357         if (card->preinit_hook &&
 358             card->preinit_hook (dev, card, PARPORT_IRQ_NONE, PARPORT_DMA_NONE))
 359                 return -ENODEV;
 360
 361         for (n = 0; n < card->numports; n++) {
 362                 struct parport *port;
 363                 int lo = card->addr[n].lo;
 364                 int hi = card->addr[n].hi;
 365                 unsigned long io_lo, io_hi;
 366
 367                 if (priv->num_par == ARRAY_SIZE (priv->port)) {
 368                         printk (KERN_WARNING
 369                                 "parport_serial: %s: only %u parallel ports "
 370                                 "supported (%d reported)\n", pci_name (dev),
 371                                 ARRAY_SIZE (priv->port), card->numports);
 372                         break;
 373                 }
 374
 375                 io_lo = pci_resource_start (dev, lo);
 376                 io_hi = 0;
 377                 if ((hi >= 0) && (hi <= 6))
 378                         io_hi = pci_resource_start (dev, hi);
 379                 else if (hi > 6)
 380                         io_lo += hi; /* Reinterpret the meaning of
 381                                         "hi" as an offset (see SYBA
 382                                         def.) */
 383                 /* TODO: test if sharing interrupts works */
 384                 printk (KERN_DEBUG "PCI parallel port detected: %04x:%04x, "
 385                         "I/O at %#lx(%#lx)\n",
 386                         parport_serial_pci_tbl[i].vendor,
 387                         parport_serial_pci_tbl[i].device, io_lo, io_hi);
 388                 port = parport_pc_probe_port (io_lo, io_hi, PARPORT_IRQ_NONE,
 389                                               PARPORT_DMA_NONE, dev);
 390                 if (port) {
 391                         priv->port[priv->num_par++] = port;
 392                         success = 1;
 393                 }
 394         }
 395
 396         if (card->postinit_hook)
 397                 card->postinit_hook (dev, card, !success);
 398
 399         return success ? 0 : 1;
 400 }
 401
 402 static int __devinit parport_serial_pci_probe (struct pci_dev *dev,
 403                                                const struct pci_device_id *id)
 404 {
 405         struct parport_serial_private *priv;
 406         int err;
 407
 408         priv = kmalloc (sizeof *priv, GFP_KERNEL);
 409         if (!priv)
 410                 return -ENOMEM;
 411         priv->num_ser = priv->num_par = 0;
 412         pci_set_drvdata (dev, priv);
 413
 414         err = pci_enable_device (dev);
 415         if (err) {
 416                 pci_set_drvdata (dev, NULL);
 417                 kfree (priv);
 418                 return err;
 419         }
 420
 421         if (parport_register (dev, id)) {
 422                 pci_set_drvdata (dev, NULL);
 423                 kfree (priv);
 424                 return -ENODEV;
 425         }
 426
 427         if (serial_register (dev, id)) {
 428                 int i;
 429                 for (i = 0; i < priv->num_par; i++)
 430                         parport_pc_unregister_port (priv->port[i]);
 431                 pci_set_drvdata (dev, NULL);
 432                 kfree (priv);
 433                 return -ENODEV;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void __devexit parport_serial_pci_remove (struct pci_dev *dev)
 440 {
 441         struct parport_serial_private *priv = pci_get_drvdata (dev);
 442         int i;
 443
 444         // Serial ports
 445         for (i = 0; i < priv->num_ser; i++) {
 446                 unregister_serial (priv->line[i]);
 447
 448                 if (priv->ser.init_fn)
 449                         (priv->ser.init_fn) (dev, &priv->ser, 0);
 450         }
 451         pci_set_drvdata (dev, NULL);
 452
 453         // Parallel ports
 454         for (i = 0; i < priv->num_par; i++)
 455                 parport_pc_unregister_port (priv->port[i]);
 456
 457         kfree (priv);
 458         return;
 459 }
 460
 461 static struct pci_driver parport_serial_pci_driver = {
 462         .name           = "parport_serial",
 463         .id_table       = parport_serial_pci_tbl,
 464         .probe          = parport_serial_pci_probe,
 465         .remove         = __devexit_p(parport_serial_pci_remove),
 466 };
 467
 468
 469 static int __init parport_serial_init (void)
 470 {
 471         return pci_module_init (&parport_serial_pci_driver);
 472 }
 473
 474 static void __exit parport_serial_exit (void)
 475 {
 476         pci_unregister_driver (&parport_serial_pci_driver);
 477         return;
 478 }
 479
 480 MODULE_AUTHOR("Tim Waugh <twaugh@redhat.com>");
 481 MODULE_DESCRIPTION("Driver for common parallel+serial multi-I/O PCI cards");
 482 MODULE_LICENSE("GPL");
 483
 484 module_init(parport_serial_init);
 485 module_exit(parport_serial_exit);