drivers/net/wireless/atmel_cs.c

   1 /*** -*- linux-c -*- **********************************************************
   2
   3      Driver for Atmel at76c502 at76c504 and at76c506 wireless cards.
   4
   5         Copyright 2000-2001 ATMEL Corporation.
   6         Copyright 2003 Simon Kelley.
   7
   8     This code was developed from version 2.1.1 of the Atmel drivers,
   9     released by Atmel corp. under the GPL in December 2002. It also
  10     includes code from the Linux aironet drivers (C) Benjamin Reed,
  11     and the Linux PCMCIA package, (C) David Hinds.
  12
  13     For all queries about this code, please contact the current author,
  14     Simon Kelley <simon@thekelleys.org.uk> and not Atmel Corporation.
  15
  16     This program is free software; you can redistribute it and/or modify
  17     it under the terms of the GNU General Public License as published by
  18     the Free Software Foundation; either version 2 of the License, or
  19     (at your option) any later version.
  20
  21     This software is distributed in the hope that it will be useful,
  22     but WITHOUT ANY WARRANTY; without even the implied warranty of
  23     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24     GNU General Public License for more details.
  25
  26     You should have received a copy of the GNU General Public License
  27     along with Atmel wireless lan drivers; if not, write to the Free Software
  28     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  29
  30 ******************************************************************************/
  31
  32 #include <linux/config.h>
  33 #ifdef __IN_PCMCIA_PACKAGE__
  34 #include <pcmcia/k_compat.h>
  35 #endif
  36 #include <linux/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/slab.h>
  41 #include <linux/string.h>
  42 #include <linux/netdevice.h>
  43 #include <linux/moduleparam.h>
  44 #include <linux/device.h>
  45
  46 #include <pcmcia/cs_types.h>
  47 #include <pcmcia/cs.h>
  48 #include <pcmcia/cistpl.h>
  49 #include <pcmcia/cisreg.h>
  50 #include <pcmcia/ds.h>
  51 #include <pcmcia/ciscode.h>
  52
  53 #include <asm/io.h>
  54 #include <asm/system.h>
  55 #include <linux/wireless.h>
  56
  57 #include "atmel.h"
  58
  59 /*
  60    All the PCMCIA modules use PCMCIA_DEBUG to control debugging.  If
  61    you do not define PCMCIA_DEBUG at all, all the debug code will be
  62    left out.  If you compile with PCMCIA_DEBUG=0, the debug code will
  63    be present but disabled -- but it can then be enabled for specific
  64    modules at load time with a 'pc_debug=#' option to insmod.
  65 */
  66
  67 #ifdef PCMCIA_DEBUG
  68 static int pc_debug = PCMCIA_DEBUG;
  69 module_param(pc_debug, int, 0);
  70 static char *version = "$Revision: 1.2 $";
  71 #define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args);
  72 #else
  73 #define DEBUG(n, args...)
  74 #endif
  75
  76 /*====================================================================*/
  77
  78 MODULE_AUTHOR("Simon Kelley");
  79 MODULE_DESCRIPTION("Support for Atmel at76c50x 802.11 wireless ethernet cards.");
  80 MODULE_LICENSE("GPL");
  81 MODULE_SUPPORTED_DEVICE("Atmel at76c50x PCMCIA cards");
  82
  83 /*====================================================================*/
  84
  85 /*
  86    The event() function is this driver's Card Services event handler.
  87    It will be called by Card Services when an appropriate card status
  88    event is received.  The config() and release() entry points are
  89    used to configure or release a socket, in response to card
  90    insertion and ejection events.  They are invoked from the atmel_cs
  91    event handler.
  92 */
  93
  94 static int atmel_config(struct pcmcia_device *link);
  95 static void atmel_release(struct pcmcia_device *link);
  96
  97 /*
  98    The attach() and detach() entry points are used to create and destroy
  99    "instances" of the driver, where each instance represents everything
 100    needed to manage one actual PCMCIA card.
 101 */
 102
 103 static void atmel_detach(struct pcmcia_device *p_dev);
 104
 105 /*
 106    You'll also need to prototype all the functions that will actually
 107    be used to talk to your device.  See 'pcmem_cs' for a good example
 108    of a fully self-sufficient driver; the other drivers rely more or
 109    less on other parts of the kernel.
 110 */
 111
 112 /*
 113    A linked list of "instances" of the  atmelnet device.  Each actual
 114    PCMCIA card corresponds to one device instance, and is described
 115    by one struct pcmcia_device structure (defined in ds.h).
 116
 117    You may not want to use a linked list for this -- for example, the
 118    memory card driver uses an array of struct pcmcia_device pointers, where minor
 119    device numbers are used to derive the corresponding array index.
 120 */
 121
 122 /*
 123    A driver needs to provide a dev_node_t structure for each device
 124    on a card.  In some cases, there is only one device per card (for
 125    example, ethernet cards, modems).  In other cases, there may be
 126    many actual or logical devices (SCSI adapters, memory cards with
 127    multiple partitions).  The dev_node_t structures need to be kept
 128    in a linked list starting at the 'dev' field of a struct pcmcia_device
 129    structure.  We allocate them in the card's private data structure,
 130    because they generally shouldn't be allocated dynamically.
 131
 132    In this case, we also provide a flag to indicate if a device is
 133    "stopped" due to a power management event, or card ejection.  The
 134    device IO routines can use a flag like this to throttle IO to a
 135    card that is not ready to accept it.
 136 */
 137
 138 typedef struct local_info_t {
 139         dev_node_t      node;
 140         struct net_device *eth_dev;
 141 } local_info_t;
 142
 143 /*======================================================================
 144
 145   atmel_attach() creates an "instance" of the driver, allocating
 146   local data structures for one device.  The device is registered
 147   with Card Services.
 148
 149   The dev_link structure is initialized, but we don't actually
 150   configure the card at this point -- we wait until we receive a
 151   card insertion event.
 152
 153   ======================================================================*/
 154
 155 static int atmel_probe(struct pcmcia_device *p_dev)
 156 {
 157         local_info_t *local;
 158
 159         DEBUG(0, "atmel_attach()\n");
 160
 161         /* Interrupt setup */
 162         p_dev->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
 163         p_dev->irq.IRQInfo1 = IRQ_LEVEL_ID;
 164         p_dev->irq.Handler = NULL;
 165
 166         /*
 167           General socket configuration defaults can go here.  In this
 168           client, we assume very little, and rely on the CIS for almost
 169           everything.  In most clients, many details (i.e., number, sizes,
 170           and attributes of IO windows) are fixed by the nature of the
 171           device, and can be hard-wired here.
 172         */
 173         p_dev->conf.Attributes = 0;
 174         p_dev->conf.IntType = INT_MEMORY_AND_IO;
 175
 176         /* Allocate space for private device-specific data */
 177         local = kzalloc(sizeof(local_info_t), GFP_KERNEL);
 178         if (!local) {
 179                 printk(KERN_ERR "atmel_cs: no memory for new device\n");
 180                 return -ENOMEM;
 181         }
 182         p_dev->priv = local;
 183
 184         return atmel_config(p_dev);
 185 } /* atmel_attach */
 186
 187 /*======================================================================
 188
 189   This deletes a driver "instance".  The device is de-registered
 190   with Card Services.  If it has been released, all local data
 191   structures are freed.  Otherwise, the structures will be freed
 192   when the device is released.
 193
 194   ======================================================================*/
 195
 196 static void atmel_detach(struct pcmcia_device *link)
 197 {
 198         DEBUG(0, "atmel_detach(0x%p)\n", link);
 199
 200         atmel_release(link);
 201
 202         kfree(link->priv);
 203 }
 204
 205 /*======================================================================
 206
 207   atmel_config() is scheduled to run after a CARD_INSERTION event
 208   is received, to configure the PCMCIA socket, and to make the
 209   device available to the system.
 210
 211   ======================================================================*/
 212
 213 #define CS_CHECK(fn, ret) \
 214 do { last_fn = (fn); if ((last_ret = (ret)) != 0) goto cs_failed; } while (0)
 215
 216 /* Call-back function to interrogate PCMCIA-specific information
 217    about the current existance of the card */
 218 static int card_present(void *arg)
 219 {
 220         struct pcmcia_device *link = (struct pcmcia_device *)arg;
 221
 222         if (pcmcia_dev_present(link))
 223                 return 1;
 224
 225         return 0;
 226 }
 227
 228 static int atmel_config(struct pcmcia_device *link)
 229 {
 230         tuple_t tuple;
 231         cisparse_t parse;
 232         local_info_t *dev;
 233         int last_fn, last_ret;
 234         u_char buf[64];
 235         struct pcmcia_device_id *did;
 236
 237         dev = link->priv;
 238         did = handle_to_dev(link).driver_data;
 239
 240         DEBUG(0, "atmel_config(0x%p)\n", link);
 241
 242         tuple.Attributes = 0;
 243         tuple.TupleData = buf;
 244         tuple.TupleDataMax = sizeof(buf);
 245         tuple.TupleOffset = 0;
 246
 247         /*
 248           This reads the card's CONFIG tuple to find its configuration
 249           registers.
 250         */
 251         tuple.DesiredTuple = CISTPL_CONFIG;
 252         CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
 253         CS_CHECK(GetTupleData, pcmcia_get_tuple_data(link, &tuple));
 254         CS_CHECK(ParseTuple, pcmcia_parse_tuple(link, &tuple, &parse));
 255         link->conf.ConfigBase = parse.config.base;
 256         link->conf.Present = parse.config.rmask[0];
 257
 258         /*
 259           In this loop, we scan the CIS for configuration table entries,
 260           each of which describes a valid card configuration, including
 261           voltage, IO window, memory window, and interrupt settings.
 262
 263           We make no assumptions about the card to be configured: we use
 264           just the information available in the CIS.  In an ideal world,
 265           this would work for any PCMCIA card, but it requires a complete
 266           and accurate CIS.  In practice, a driver usually "knows" most of
 267           these things without consulting the CIS, and most client drivers
 268           will only use the CIS to fill in implementation-defined details.
 269         */
 270         tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
 271         CS_CHECK(GetFirstTuple, pcmcia_get_first_tuple(link, &tuple));
 272         while (1) {
 273                 cistpl_cftable_entry_t dflt = { 0 };
 274                 cistpl_cftable_entry_t *cfg = &(parse.cftable_entry);
 275                 if (pcmcia_get_tuple_data(link, &tuple) != 0 ||
 276                                 pcmcia_parse_tuple(link, &tuple, &parse) != 0)
 277                         goto next_entry;
 278
 279                 if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
 280                 if (cfg->index == 0) goto next_entry;
 281                 link->conf.ConfigIndex = cfg->index;
 282
 283                 /* Does this card need audio output? */
 284                 if (cfg->flags & CISTPL_CFTABLE_AUDIO) {
 285                         link->conf.Attributes |= CONF_ENABLE_SPKR;
 286                         link->conf.Status = CCSR_AUDIO_ENA;
 287                 }
 288
 289                 /* Use power settings for Vcc and Vpp if present */
 290                 /*  Note that the CIS values need to be rescaled */
 291                 if (cfg->vpp1.present & (1<<CISTPL_POWER_VNOM))
 292                         link->conf.Vpp =
 293                                 cfg->vpp1.param[CISTPL_POWER_VNOM]/10000;
 294                 else if (dflt.vpp1.present & (1<<CISTPL_POWER_VNOM))
 295                         link->conf.Vpp =
 296                                 dflt.vpp1.param[CISTPL_POWER_VNOM]/10000;
 297
 298                 /* Do we need to allocate an interrupt? */
 299                 if (cfg->irq.IRQInfo1 || dflt.irq.IRQInfo1)
 300                         link->conf.Attributes |= CONF_ENABLE_IRQ;
 301
 302                 /* IO window settings */
 303                 link->io.NumPorts1 = link->io.NumPorts2 = 0;
 304                 if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
 305                         cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
 306                         link->io.Attributes1 = IO_DATA_PATH_WIDTH_AUTO;
 307                         if (!(io->flags & CISTPL_IO_8BIT))
 308                                 link->io.Attributes1 = IO_DATA_PATH_WIDTH_16;
 309                         if (!(io->flags & CISTPL_IO_16BIT))
 310                                 link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
 311                         link->io.BasePort1 = io->win[0].base;
 312                         link->io.NumPorts1 = io->win[0].len;
 313                         if (io->nwin > 1) {
 314                                 link->io.Attributes2 = link->io.Attributes1;
 315                                 link->io.BasePort2 = io->win[1].base;
 316                                 link->io.NumPorts2 = io->win[1].len;
 317                         }
 318                 }
 319
 320                 /* This reserves IO space but doesn't actually enable it */
 321                 if (pcmcia_request_io(link, &link->io) != 0)
 322                         goto next_entry;
 323
 324                 /* If we got this far, we're cool! */
 325                 break;
 326
 327         next_entry:
 328                 CS_CHECK(GetNextTuple, pcmcia_get_next_tuple(link, &tuple));
 329         }
 330
 331         /*
 332           Allocate an interrupt line.  Note that this does not assign a
 333           handler to the interrupt, unless the 'Handler' member of the
 334           irq structure is initialized.
 335         */
 336         if (link->conf.Attributes & CONF_ENABLE_IRQ)
 337                 CS_CHECK(RequestIRQ, pcmcia_request_irq(link, &link->irq));
 338
 339         /*
 340           This actually configures the PCMCIA socket -- setting up
 341           the I/O windows and the interrupt mapping, and putting the
 342           card and host interface into "Memory and IO" mode.
 343         */
 344         CS_CHECK(RequestConfiguration, pcmcia_request_configuration(link, &link->conf));
 345
 346         if (link->irq.AssignedIRQ == 0) {
 347                 printk(KERN_ALERT
 348                        "atmel: cannot assign IRQ: check that CONFIG_ISA is set in kernel config.");
 349                 goto cs_failed;
 350         }
 351
 352         ((local_info_t*)link->priv)->eth_dev =
 353                 init_atmel_card(link->irq.AssignedIRQ,
 354                                 link->io.BasePort1,
 355                                 did ? did->driver_info : ATMEL_FW_TYPE_NONE,
 356                                 &handle_to_dev(link),
 357                                 card_present,
 358                                 link);
 359         if (!((local_info_t*)link->priv)->eth_dev)
 360                         goto cs_failed;
 361
 362
 363         /*
 364           At this point, the dev_node_t structure(s) need to be
 365           initialized and arranged in a linked list at link->dev_node.
 366         */
 367         strcpy(dev->node.dev_name, ((local_info_t*)link->priv)->eth_dev->name );
 368         dev->node.major = dev->node.minor = 0;
 369         link->dev_node = &dev->node;
 370
 371         return 0;
 372
 373  cs_failed:
 374         cs_error(link, last_fn, last_ret);
 375         atmel_release(link);
 376         return -ENODEV;
 377 }
 378
 379 /*======================================================================
 380
 381   After a card is removed, atmel_release() will unregister the
 382   device, and release the PCMCIA configuration.  If the device is
 383   still open, this will be postponed until it is closed.
 384
 385   ======================================================================*/
 386
 387 static void atmel_release(struct pcmcia_device *link)
 388 {
 389         struct net_device *dev = ((local_info_t*)link->priv)->eth_dev;
 390
 391         DEBUG(0, "atmel_release(0x%p)\n", link);
 392
 393         if (dev)
 394                 stop_atmel_card(dev);
 395         ((local_info_t*)link->priv)->eth_dev = NULL;
 396
 397         pcmcia_disable_device(link);
 398 }
 399
 400 static int atmel_suspend(struct pcmcia_device *link)
 401 {
 402         local_info_t *local = link->priv;
 403
 404         netif_device_detach(local->eth_dev);
 405
 406         return 0;
 407 }
 408
 409 static int atmel_resume(struct pcmcia_device *link)
 410 {
 411         local_info_t *local = link->priv;
 412
 413         atmel_open(local->eth_dev);
 414         netif_device_attach(local->eth_dev);
 415
 416         return 0;
 417 }
 418
 419 /*====================================================================*/
 420 /* We use the driver_info field to store the correct firmware type for a card. */
 421
 422 #define PCMCIA_DEVICE_MANF_CARD_INFO(manf, card, info) { \
 423         .match_flags = PCMCIA_DEV_ID_MATCH_MANF_ID| \
 424                         PCMCIA_DEV_ID_MATCH_CARD_ID, \
 425         .manf_id = (manf), \
 426         .card_id = (card), \
 427         .driver_info = (kernel_ulong_t)(info), }
 428
 429 #define PCMCIA_DEVICE_PROD_ID12_INFO(v1, v2, vh1, vh2, info) { \
 430         .match_flags = PCMCIA_DEV_ID_MATCH_PROD_ID1| \
 431                         PCMCIA_DEV_ID_MATCH_PROD_ID2, \
 432         .prod_id = { (v1), (v2), NULL, NULL }, \
 433         .prod_id_hash = { (vh1), (vh2), 0, 0 }, \
 434         .driver_info = (kernel_ulong_t)(info), }
 435
 436 static struct pcmcia_device_id atmel_ids[] = {
 437         PCMCIA_DEVICE_MANF_CARD_INFO(0x0101, 0x0620, ATMEL_FW_TYPE_502_3COM),
 438         PCMCIA_DEVICE_MANF_CARD_INFO(0x0101, 0x0696, ATMEL_FW_TYPE_502_3COM),
 439         PCMCIA_DEVICE_MANF_CARD_INFO(0x01bf, 0x3302, ATMEL_FW_TYPE_502E),
 440         PCMCIA_DEVICE_MANF_CARD_INFO(0xd601, 0x0007, ATMEL_FW_TYPE_502),
 441         PCMCIA_DEVICE_PROD_ID12_INFO("11WAVE", "11WP611AL-E", 0x9eb2da1f, 0xc9a0d3f9, ATMEL_FW_TYPE_502E),
 442         PCMCIA_DEVICE_PROD_ID12_INFO("ATMEL", "AT76C502AR", 0xabda4164, 0x41b37e1f, ATMEL_FW_TYPE_502),
 443         PCMCIA_DEVICE_PROD_ID12_INFO("ATMEL", "AT76C502AR_D", 0xabda4164, 0x3675d704, ATMEL_FW_TYPE_502D),
 444         PCMCIA_DEVICE_PROD_ID12_INFO("ATMEL", "AT76C502AR_E", 0xabda4164, 0x4172e792, ATMEL_FW_TYPE_502E),
 445         PCMCIA_DEVICE_PROD_ID12_INFO("ATMEL", "AT76C504_R", 0xabda4164, 0x917f3d72, ATMEL_FW_TYPE_504_2958),
 446         PCMCIA_DEVICE_PROD_ID12_INFO("ATMEL", "AT76C504", 0xabda4164, 0x5040670a, ATMEL_FW_TYPE_504),
 447         PCMCIA_DEVICE_PROD_ID12_INFO("ATMEL", "AT76C504A", 0xabda4164, 0xe15ed87f, ATMEL_FW_TYPE_504A_2958),
 448         PCMCIA_DEVICE_PROD_ID12_INFO("BT", "Voyager 1020 Laptop Adapter", 0xae49b86a, 0x1e957cd5, ATMEL_FW_TYPE_502),
 449         PCMCIA_DEVICE_PROD_ID12_INFO("CNet", "CNWLC 11Mbps Wireless PC Card V-5", 0xbc477dde, 0x502fae6b, ATMEL_FW_TYPE_502E),
 450         PCMCIA_DEVICE_PROD_ID12_INFO("IEEE 802.11b", "Wireless LAN PC Card", 0x5b878724, 0x122f1df6, ATMEL_FW_TYPE_502),
 451         PCMCIA_DEVICE_PROD_ID12_INFO("IEEE 802.11b", "Wireless LAN Card S", 0x5b878724, 0x5fba533a, ATMEL_FW_TYPE_504_2958),
 452         PCMCIA_DEVICE_PROD_ID12_INFO("OEM", "11Mbps Wireless LAN PC Card V-3", 0xfea54c90, 0x1c5b0f68, ATMEL_FW_TYPE_502),
 453         PCMCIA_DEVICE_PROD_ID12_INFO("SMC", "2632W", 0xc4f8b18b, 0x30f38774, ATMEL_FW_TYPE_502D),
 454         PCMCIA_DEVICE_PROD_ID12_INFO("SMC", "2632W-V2", 0xc4f8b18b, 0x172d1377, ATMEL_FW_TYPE_502),
 455         PCMCIA_DEVICE_PROD_ID12_INFO("Wireless", "PC_CARD", 0xa407ecdd, 0x119f6314, ATMEL_FW_TYPE_502D),
 456         PCMCIA_DEVICE_PROD_ID12_INFO("WLAN", "802.11b PC CARD", 0x575c516c, 0xb1f6dbc4, ATMEL_FW_TYPE_502D),
 457         PCMCIA_DEVICE_PROD_ID12_INFO("LG", "LW2100N", 0xb474d43a, 0x6b1fec94, ATMEL_FW_TYPE_502E),
 458         PCMCIA_DEVICE_NULL
 459 };
 460
 461 MODULE_DEVICE_TABLE(pcmcia, atmel_ids);
 462
 463 static struct pcmcia_driver atmel_driver = {
 464         .owner          = THIS_MODULE,
 465         .drv            = {
 466                 .name   = "atmel_cs",
 467         },
 468         .probe          = atmel_probe,
 469         .remove         = atmel_detach,
 470         .id_table       = atmel_ids,
 471         .suspend        = atmel_suspend,
 472         .resume         = atmel_resume,
 473 };
 474
 475 static int atmel_cs_init(void)
 476 {
 477         return pcmcia_register_driver(&atmel_driver);
 478 }
 479
 480 static void atmel_cs_cleanup(void)
 481 {
 482         pcmcia_unregister_driver(&atmel_driver);
 483 }
 484
 485 /*
 486     This program is free software; you can redistribute it and/or
 487     modify it under the terms of the GNU General Public License
 488     as published by the Free Software Foundation; either version 2
 489     of the License, or (at your option) any later version.
 490
 491     This program is distributed in the hope that it will be useful,
 492     but WITHOUT ANY WARRANTY; without even the implied warranty of
 493     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 494     GNU General Public License for more details.
 495
 496     In addition:
 497
 498     Redistribution and use in source and binary forms, with or without
 499     modification, are permitted provided that the following conditions
 500     are met:
 501
 502     1. Redistributions of source code must retain the above copyright
 503        notice, this list of conditions and the following disclaimer.
 504     2. Redistributions in binary form must reproduce the above copyright
 505        notice, this list of conditions and the following disclaimer in the
 506        documentation and/or other materials provided with the distribution.
 507     3. The name of the author may not be used to endorse or promote
 508        products derived from this software without specific prior written
 509        permission.
 510
 511     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 512     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 513     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 514     ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
 515     INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 516     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 517     SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 518     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 519     STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 520     IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 521     POSSIBILITY OF SUCH DAMAGE.
 522 */
 523
 524 module_init(atmel_cs_init);
 525 module_exit(atmel_cs_cleanup);