drivers/w1/masters/ds1wm.c

   1 /*
   2  * 1-wire busmaster driver for DS1WM and ASICs with embedded DS1WMs
   3  * such as HP iPAQs (including h5xxx, h2200, and devices with ASIC3
   4  * like hx4700).
   5  *
   6  * Copyright (c) 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
   7  * Copyright (c) 2004-2007, Matt Reimer <mreimer@vpop.net>
   8  *
   9  * Use consistent with the GNU GPL is permitted,
  10  * provided that this copyright notice is
  11  * preserved in its entirety in all copies and derived works.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <linux/irq.h>
  18 #include <linux/pm.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/err.h>
  21 #include <linux/delay.h>
  22 #include <linux/mfd/core.h>
  23 #include <linux/mfd/ds1wm.h>
  24 #include <linux/slab.h>
  25
  26 #include <asm/io.h>
  27
  28 #include "../w1.h"
  29 #include "../w1_int.h"
  30
  31
  32 #define DS1WM_CMD       0x00    /* R/W 4 bits command */
  33 #define DS1WM_DATA      0x01    /* R/W 8 bits, transmit/receive buffer */
  34 #define DS1WM_INT       0x02    /* R/W interrupt status */
  35 #define DS1WM_INT_EN    0x03    /* R/W interrupt enable */
  36 #define DS1WM_CLKDIV    0x04    /* R/W 5 bits of divisor and pre-scale */
  37 #define DS1WM_CNTRL     0x05    /* R/W master control register (not used yet) */
  38
  39 #define DS1WM_CMD_1W_RESET  (1 << 0)    /* force reset on 1-wire bus */
  40 #define DS1WM_CMD_SRA       (1 << 1)    /* enable Search ROM accelerator mode */
  41 #define DS1WM_CMD_DQ_OUTPUT (1 << 2)    /* write only - forces bus low */
  42 #define DS1WM_CMD_DQ_INPUT  (1 << 3)    /* read only - reflects state of bus */
  43 #define DS1WM_CMD_RST       (1 << 5)    /* software reset */
  44 #define DS1WM_CMD_OD        (1 << 7)    /* overdrive */
  45
  46 #define DS1WM_INT_PD        (1 << 0)    /* presence detect */
  47 #define DS1WM_INT_PDR       (1 << 1)    /* presence detect result */
  48 #define DS1WM_INT_TBE       (1 << 2)    /* tx buffer empty */
  49 #define DS1WM_INT_TSRE      (1 << 3)    /* tx shift register empty */
  50 #define DS1WM_INT_RBF       (1 << 4)    /* rx buffer full */
  51 #define DS1WM_INT_RSRF      (1 << 5)    /* rx shift register full */
  52
  53 #define DS1WM_INTEN_EPD     (1 << 0)    /* enable presence detect int */
  54 #define DS1WM_INTEN_IAS     (1 << 1)    /* INTR active state */
  55 #define DS1WM_INTEN_ETBE    (1 << 2)    /* enable tx buffer empty int */
  56 #define DS1WM_INTEN_ETMT    (1 << 3)    /* enable tx shift register empty int */
  57 #define DS1WM_INTEN_ERBF    (1 << 4)    /* enable rx buffer full int */
  58 #define DS1WM_INTEN_ERSRF   (1 << 5)    /* enable rx shift register full int */
  59 #define DS1WM_INTEN_DQO     (1 << 6)    /* enable direct bus driving ops */
  60
  61 #define DS1WM_INTEN_NOT_IAS (~DS1WM_INTEN_IAS)  /* all but INTR active state */
  62
  63 #define DS1WM_TIMEOUT (HZ * 5)
  64
  65 static struct {
  66         unsigned long freq;
  67         unsigned long divisor;
  68 } freq[] = {
  69         {   1000000, 0x80 },
  70         {   2000000, 0x84 },
  71         {   3000000, 0x81 },
  72         {   4000000, 0x88 },
  73         {   5000000, 0x82 },
  74         {   6000000, 0x85 },
  75         {   7000000, 0x83 },
  76         {   8000000, 0x8c },
  77         {  10000000, 0x86 },
  78         {  12000000, 0x89 },
  79         {  14000000, 0x87 },
  80         {  16000000, 0x90 },
  81         {  20000000, 0x8a },
  82         {  24000000, 0x8d },
  83         {  28000000, 0x8b },
  84         {  32000000, 0x94 },
  85         {  40000000, 0x8e },
  86         {  48000000, 0x91 },
  87         {  56000000, 0x8f },
  88         {  64000000, 0x98 },
  89         {  80000000, 0x92 },
  90         {  96000000, 0x95 },
  91         { 112000000, 0x93 },
  92         { 128000000, 0x9c },
  93 /* you can continue this table, consult the OPERATION - CLOCK DIVISOR
  94    section of the ds1wm spec sheet. */
  95 };
  96
  97 struct ds1wm_data {
  98         void     __iomem *map;
  99         int      bus_shift; /* # of shifts to calc register offsets */
 100         struct platform_device *pdev;
 101         const struct mfd_cell   *cell;
 102         int      irq;
 103         int      slave_present;
 104         void     *reset_complete;
 105         void     *read_complete;
 106         void     *write_complete;
 107         int      read_error;
 108         /* last byte received */
 109         u8       read_byte;
 110         /* byte to write that makes all intr disabled, */
 111         /* considering active_state (IAS) (optimization) */
 112         u8       int_en_reg_none;
 113         unsigned int reset_recover_delay; /* see ds1wm.h */
 114 };
 115
 116 static inline void ds1wm_write_register(struct ds1wm_data *ds1wm_data, u32 reg,
 117                                         u8 val)
 118 {
 119         __raw_writeb(val, ds1wm_data->map + (reg << ds1wm_data->bus_shift));
 120 }
 121
 122 static inline u8 ds1wm_read_register(struct ds1wm_data *ds1wm_data, u32 reg)
 123 {
 124         return __raw_readb(ds1wm_data->map + (reg << ds1wm_data->bus_shift));
 125 }
 126
 127
 128 static irqreturn_t ds1wm_isr(int isr, void *data)
 129 {
 130         struct ds1wm_data *ds1wm_data = data;
 131         u8 intr;
 132         u8 inten = ds1wm_read_register(ds1wm_data, DS1WM_INT_EN);
 133         /* if no bits are set in int enable register (except the IAS)
 134         than go no further, reading the regs below has side effects */
 135         if (!(inten & DS1WM_INTEN_NOT_IAS))
 136                 return IRQ_NONE;
 137
 138         ds1wm_write_register(ds1wm_data,
 139                 DS1WM_INT_EN, ds1wm_data->int_en_reg_none);
 140
 141         /* this read action clears the INTR and certain flags in ds1wm */
 142         intr = ds1wm_read_register(ds1wm_data, DS1WM_INT);
 143
 144         ds1wm_data->slave_present = (intr & DS1WM_INT_PDR) ? 0 : 1;
 145
 146         if ((intr & DS1WM_INT_TSRE) && ds1wm_data->write_complete) {
 147                 inten &= ~DS1WM_INTEN_ETMT;
 148                 complete(ds1wm_data->write_complete);
 149         }
 150         if (intr & DS1WM_INT_RBF) {
 151                 /* this read clears the RBF flag */
 152                 ds1wm_data->read_byte = ds1wm_read_register(ds1wm_data,
 153                 DS1WM_DATA);
 154                 inten &= ~DS1WM_INTEN_ERBF;
 155                 if (ds1wm_data->read_complete)
 156                         complete(ds1wm_data->read_complete);
 157         }
 158         if ((intr & DS1WM_INT_PD) && ds1wm_data->reset_complete) {
 159                 inten &= ~DS1WM_INTEN_EPD;
 160                 complete(ds1wm_data->reset_complete);
 161         }
 162
 163         ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, inten);
 164         return IRQ_HANDLED;
 165 }
 166
 167 static int ds1wm_reset(struct ds1wm_data *ds1wm_data)
 168 {
 169         unsigned long timeleft;
 170         DECLARE_COMPLETION_ONSTACK(reset_done);
 171
 172         ds1wm_data->reset_complete = &reset_done;
 173
 174         /* enable Presence detect only */
 175         ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, DS1WM_INTEN_EPD |
 176         ds1wm_data->int_en_reg_none);
 177
 178         ds1wm_write_register(ds1wm_data, DS1WM_CMD, DS1WM_CMD_1W_RESET);
 179
 180         timeleft = wait_for_completion_timeout(&reset_done, DS1WM_TIMEOUT);
 181         ds1wm_data->reset_complete = NULL;
 182         if (!timeleft) {
 183                 dev_err(&ds1wm_data->pdev->dev, "reset failed, timed out\n");
 184                 return 1;
 185         }
 186
 187         if (!ds1wm_data->slave_present) {
 188                 dev_dbg(&ds1wm_data->pdev->dev, "reset: no devices found\n");
 189                 return 1;
 190         }
 191
 192         if (ds1wm_data->reset_recover_delay)
 193                 msleep(ds1wm_data->reset_recover_delay);
 194
 195         return 0;
 196 }
 197
 198 static int ds1wm_write(struct ds1wm_data *ds1wm_data, u8 data)
 199 {
 200         unsigned long timeleft;
 201         DECLARE_COMPLETION_ONSTACK(write_done);
 202         ds1wm_data->write_complete = &write_done;
 203
 204         ds1wm_write_register(ds1wm_data, DS1WM_INT_EN,
 205         ds1wm_data->int_en_reg_none | DS1WM_INTEN_ETMT);
 206
 207         ds1wm_write_register(ds1wm_data, DS1WM_DATA, data);
 208
 209         timeleft = wait_for_completion_timeout(&write_done, DS1WM_TIMEOUT);
 210
 211         ds1wm_data->write_complete = NULL;
 212         if (!timeleft) {
 213                 dev_err(&ds1wm_data->pdev->dev, "write failed, timed out\n");
 214                 return -ETIMEDOUT;
 215         }
 216
 217         return 0;
 218 }
 219
 220 static u8 ds1wm_read(struct ds1wm_data *ds1wm_data, unsigned char write_data)
 221 {
 222         unsigned long timeleft;
 223         u8 intEnable = DS1WM_INTEN_ERBF | ds1wm_data->int_en_reg_none;
 224         DECLARE_COMPLETION_ONSTACK(read_done);
 225
 226         ds1wm_read_register(ds1wm_data, DS1WM_DATA);
 227
 228         ds1wm_data->read_complete = &read_done;
 229         ds1wm_write_register(ds1wm_data, DS1WM_INT_EN, intEnable);
 230
 231         ds1wm_write_register(ds1wm_data, DS1WM_DATA, write_data);
 232         timeleft = wait_for_completion_timeout(&read_done, DS1WM_TIMEOUT);
 233
 234         ds1wm_data->read_complete = NULL;
 235         if (!timeleft) {
 236                 dev_err(&ds1wm_data->pdev->dev, "read failed, timed out\n");
 237                 ds1wm_data->read_error = -ETIMEDOUT;
 238                 return 0xFF;
 239         }
 240         ds1wm_data->read_error = 0;
 241         return ds1wm_data->read_byte;
 242 }
 243
 244 static int ds1wm_find_divisor(int gclk)
 245 {
 246         int i;
 247
 248         for (i = ARRAY_SIZE(freq)-1; i >= 0; --i)
 249                 if (gclk >= freq[i].freq)
 250                         return freq[i].divisor;
 251
 252         return 0;
 253 }
 254
 255 static void ds1wm_up(struct ds1wm_data *ds1wm_data)
 256 {
 257         int divisor;
 258         struct device *dev = &ds1wm_data->pdev->dev;
 259         struct ds1wm_driver_data *plat = dev_get_platdata(dev);
 260
 261         if (ds1wm_data->cell->enable)
 262                 ds1wm_data->cell->enable(ds1wm_data->pdev);
 263
 264         divisor = ds1wm_find_divisor(plat->clock_rate);
 265         dev_dbg(dev, "found divisor 0x%x for clock %d\n",
 266                 divisor, plat->clock_rate);
 267         if (divisor == 0) {
 268                 dev_err(dev, "no suitable divisor for %dHz clock\n",
 269                         plat->clock_rate);
 270                 return;
 271         }
 272         ds1wm_write_register(ds1wm_data, DS1WM_CLKDIV, divisor);
 273
 274         /* Let the w1 clock stabilize. */
 275         msleep(1);
 276
 277         ds1wm_reset(ds1wm_data);
 278 }
 279
 280 static void ds1wm_down(struct ds1wm_data *ds1wm_data)
 281 {
 282         ds1wm_reset(ds1wm_data);
 283
 284         /* Disable interrupts. */
 285         ds1wm_write_register(ds1wm_data, DS1WM_INT_EN,
 286                 ds1wm_data->int_en_reg_none);
 287
 288         if (ds1wm_data->cell->disable)
 289                 ds1wm_data->cell->disable(ds1wm_data->pdev);
 290 }
 291
 292 /* --------------------------------------------------------------------- */
 293 /* w1 methods */
 294
 295 static u8 ds1wm_read_byte(void *data)
 296 {
 297         struct ds1wm_data *ds1wm_data = data;
 298
 299         return ds1wm_read(ds1wm_data, 0xff);
 300 }
 301
 302 static void ds1wm_write_byte(void *data, u8 byte)
 303 {
 304         struct ds1wm_data *ds1wm_data = data;
 305
 306         ds1wm_write(ds1wm_data, byte);
 307 }
 308
 309 static u8 ds1wm_reset_bus(void *data)
 310 {
 311         struct ds1wm_data *ds1wm_data = data;
 312
 313         ds1wm_reset(ds1wm_data);
 314
 315         return 0;
 316 }
 317
 318 static void ds1wm_search(void *data, struct w1_master *master_dev,
 319                         u8 search_type, w1_slave_found_callback slave_found)
 320 {
 321         struct ds1wm_data *ds1wm_data = data;
 322         int i;
 323         int ms_discrep_bit = -1;
 324         u64 r = 0; /* holds the progress of the search */
 325         u64 r_prime, d;
 326         unsigned slaves_found = 0;
 327         unsigned int pass = 0;
 328
 329         dev_dbg(&ds1wm_data->pdev->dev, "search begin\n");
 330         while (true) {
 331                 ++pass;
 332                 if (pass > 100) {
 333                         dev_dbg(&ds1wm_data->pdev->dev,
 334                                 "too many attempts (100), search aborted\n");
 335                         return;
 336                 }
 337
 338                 mutex_lock(&master_dev->bus_mutex);
 339                 if (ds1wm_reset(ds1wm_data)) {
 340                         mutex_unlock(&master_dev->bus_mutex);
 341                         dev_dbg(&ds1wm_data->pdev->dev,
 342                                 "pass: %d reset error (or no slaves)\n", pass);
 343                         break;
 344                 }
 345
 346                 dev_dbg(&ds1wm_data->pdev->dev,
 347                         "pass: %d r : %0#18llx writing SEARCH_ROM\n", pass, r);
 348                 ds1wm_write(ds1wm_data, search_type);
 349                 dev_dbg(&ds1wm_data->pdev->dev,
 350                         "pass: %d entering ASM\n", pass);
 351                 ds1wm_write_register(ds1wm_data, DS1WM_CMD, DS1WM_CMD_SRA);
 352                 dev_dbg(&ds1wm_data->pdev->dev,
 353                         "pass: %d beginning nibble loop\n", pass);
 354
 355                 r_prime = 0;
 356                 d = 0;
 357                 /* we work one nibble at a time */
 358                 /* each nibble is interleaved to form a byte */
 359                 for (i = 0; i < 16; i++) {
 360
 361                         unsigned char resp, _r, _r_prime, _d;
 362
 363                         _r = (r >> (4*i)) & 0xf;
 364                         _r = ((_r & 0x1) << 1) |
 365                         ((_r & 0x2) << 2) |
 366                         ((_r & 0x4) << 3) |
 367                         ((_r & 0x8) << 4);
 368
 369                         /* writes _r, then reads back: */
 370                         resp = ds1wm_read(ds1wm_data, _r);
 371
 372                         if (ds1wm_data->read_error) {
 373                                 dev_err(&ds1wm_data->pdev->dev,
 374                                 "pass: %d nibble: %d read error\n", pass, i);
 375                                 break;
 376                         }
 377
 378                         _r_prime = ((resp & 0x02) >> 1) |
 379                         ((resp & 0x08) >> 2) |
 380                         ((resp & 0x20) >> 3) |
 381                         ((resp & 0x80) >> 4);
 382
 383                         _d = ((resp & 0x01) >> 0) |
 384                         ((resp & 0x04) >> 1) |
 385                         ((resp & 0x10) >> 2) |
 386                         ((resp & 0x40) >> 3);
 387
 388                         r_prime |= (unsigned long long) _r_prime << (i * 4);
 389                         d |= (unsigned long long) _d << (i * 4);
 390
 391                 }
 392                 if (ds1wm_data->read_error) {
 393                         mutex_unlock(&master_dev->bus_mutex);
 394                         dev_err(&ds1wm_data->pdev->dev,
 395                                 "pass: %d read error, retrying\n", pass);
 396                         break;
 397                 }
 398                 dev_dbg(&ds1wm_data->pdev->dev,
 399                         "pass: %d r\': %0#18llx d:%0#18llx\n",
 400                         pass, r_prime, d);
 401                 dev_dbg(&ds1wm_data->pdev->dev,
 402                         "pass: %d nibble loop complete, exiting ASM\n", pass);
 403                 ds1wm_write_register(ds1wm_data, DS1WM_CMD, ~DS1WM_CMD_SRA);
 404                 dev_dbg(&ds1wm_data->pdev->dev,
 405                         "pass: %d resetting bus\n", pass);
 406                 ds1wm_reset(ds1wm_data);
 407                 mutex_unlock(&master_dev->bus_mutex);
 408                 if ((r_prime & ((u64)1 << 63)) && (d & ((u64)1 << 63))) {
 409                         dev_err(&ds1wm_data->pdev->dev,
 410                                 "pass: %d bus error, retrying\n", pass);
 411                         continue; /* start over */
 412                 }
 413
 414
 415                 dev_dbg(&ds1wm_data->pdev->dev,
 416                         "pass: %d found %0#18llx\n", pass, r_prime);
 417                 slave_found(master_dev, r_prime);
 418                 ++slaves_found;
 419                 dev_dbg(&ds1wm_data->pdev->dev,
 420                         "pass: %d complete, preparing next pass\n", pass);
 421
 422                 /* any discrepency found which we already choose the
 423                    '1' branch is now is now irrelevant we reveal the
 424                    next branch with this: */
 425                 d &= ~r;
 426                 /* find last bit set, i.e. the most signif. bit set */
 427                 ms_discrep_bit = fls64(d) - 1;
 428                 dev_dbg(&ds1wm_data->pdev->dev,
 429                         "pass: %d new d:%0#18llx MS discrep bit:%d\n",
 430                         pass, d, ms_discrep_bit);
 431
 432                 /* prev_ms_discrep_bit = ms_discrep_bit;
 433                    prepare for next ROM search:             */
 434                 if (ms_discrep_bit == -1)
 435                         break;
 436
 437                 r = (r &  ~(~0ull << (ms_discrep_bit))) | 1 << ms_discrep_bit;
 438         } /* end while true */
 439         dev_dbg(&ds1wm_data->pdev->dev,
 440                 "pass: %d total: %d search done ms d bit pos: %d\n", pass,
 441                 slaves_found, ms_discrep_bit);
 442 }
 443
 444 /* --------------------------------------------------------------------- */
 445
 446 static struct w1_bus_master ds1wm_master = {
 447         .read_byte  = ds1wm_read_byte,
 448         .write_byte = ds1wm_write_byte,
 449         .reset_bus  = ds1wm_reset_bus,
 450         .search     = ds1wm_search,
 451 };
 452
 453 static int ds1wm_probe(struct platform_device *pdev)
 454 {
 455         struct ds1wm_data *ds1wm_data;
 456         struct ds1wm_driver_data *plat;
 457         struct resource *res;
 458         int ret;
 459
 460         if (!pdev)
 461                 return -ENODEV;
 462
 463         ds1wm_data = devm_kzalloc(&pdev->dev, sizeof(*ds1wm_data), GFP_KERNEL);
 464         if (!ds1wm_data)
 465                 return -ENOMEM;
 466
 467         platform_set_drvdata(pdev, ds1wm_data);
 468
 469         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 470         if (!res)
 471                 return -ENXIO;
 472         ds1wm_data->map = devm_ioremap(&pdev->dev, res->start,
 473                                        resource_size(res));
 474         if (!ds1wm_data->map)
 475                 return -ENOMEM;
 476
 477         /* calculate bus shift from mem resource */
 478         ds1wm_data->bus_shift = resource_size(res) >> 3;
 479
 480         ds1wm_data->pdev = pdev;
 481         ds1wm_data->cell = mfd_get_cell(pdev);
 482         if (!ds1wm_data->cell)
 483                 return -ENODEV;
 484         plat = dev_get_platdata(&pdev->dev);
 485         if (!plat)
 486                 return -ENODEV;
 487
 488         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 489         if (!res)
 490                 return -ENXIO;
 491         ds1wm_data->irq = res->start;
 492         ds1wm_data->int_en_reg_none = (plat->active_high ? DS1WM_INTEN_IAS : 0);
 493         ds1wm_data->reset_recover_delay = plat->reset_recover_delay;
 494
 495         if (res->flags & IORESOURCE_IRQ_HIGHEDGE)
 496                 irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_RISING);
 497         if (res->flags & IORESOURCE_IRQ_LOWEDGE)
 498                 irq_set_irq_type(ds1wm_data->irq, IRQ_TYPE_EDGE_FALLING);
 499
 500         ret = devm_request_irq(&pdev->dev, ds1wm_data->irq, ds1wm_isr,
 501                         IRQF_SHARED, "ds1wm", ds1wm_data);
 502         if (ret)
 503                 return ret;
 504
 505         ds1wm_up(ds1wm_data);
 506
 507         ds1wm_master.data = (void *)ds1wm_data;
 508
 509         ret = w1_add_master_device(&ds1wm_master);
 510         if (ret)
 511                 goto err;
 512
 513         return 0;
 514
 515 err:
 516         ds1wm_down(ds1wm_data);
 517
 518         return ret;
 519 }
 520
 521 #ifdef CONFIG_PM
 522 static int ds1wm_suspend(struct platform_device *pdev, pm_message_t state)
 523 {
 524         struct ds1wm_data *ds1wm_data = platform_get_drvdata(pdev);
 525
 526         ds1wm_down(ds1wm_data);
 527
 528         return 0;
 529 }
 530
 531 static int ds1wm_resume(struct platform_device *pdev)
 532 {
 533         struct ds1wm_data *ds1wm_data = platform_get_drvdata(pdev);
 534
 535         ds1wm_up(ds1wm_data);
 536
 537         return 0;
 538 }
 539 #else
 540 #define ds1wm_suspend NULL
 541 #define ds1wm_resume NULL
 542 #endif
 543
 544 static int ds1wm_remove(struct platform_device *pdev)
 545 {
 546         struct ds1wm_data *ds1wm_data = platform_get_drvdata(pdev);
 547
 548         w1_remove_master_device(&ds1wm_master);
 549         ds1wm_down(ds1wm_data);
 550
 551         return 0;
 552 }
 553
 554 static struct platform_driver ds1wm_driver = {
 555         .driver   = {
 556                 .name = "ds1wm",
 557         },
 558         .probe    = ds1wm_probe,
 559         .remove   = ds1wm_remove,
 560         .suspend  = ds1wm_suspend,
 561         .resume   = ds1wm_resume
 562 };
 563
 564 static int __init ds1wm_init(void)
 565 {
 566         pr_info("DS1WM w1 busmaster driver - (c) 2004 Szabolcs Gyurko\n");
 567         return platform_driver_register(&ds1wm_driver);
 568 }
 569
 570 static void __exit ds1wm_exit(void)
 571 {
 572         platform_driver_unregister(&ds1wm_driver);
 573 }
 574
 575 module_init(ds1wm_init);
 576 module_exit(ds1wm_exit);
 577
 578 MODULE_LICENSE("GPL");
 579 MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
 580         "Matt Reimer <mreimer@vpop.net>,"
 581         "Jean-Francois Dagenais <dagenaisj@sonatest.com>");
 582 MODULE_DESCRIPTION("DS1WM w1 busmaster driver");