drivers/hwmon/lis3lv02d.c

   1 /*
   2  *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
   3  *
   4  *  Copyright (C) 2007-2008 Yan Burman
   5  *  Copyright (C) 2008 Eric Piel
   6  *  Copyright (C) 2008-2009 Pavel Machek
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/dmi.h>
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/input-polldev.h>
  31 #include <linux/delay.h>
  32 #include <linux/wait.h>
  33 #include <linux/poll.h>
  34 #include <linux/freezer.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/miscdevice.h>
  37 #include <asm/atomic.h>
  38 #include "lis3lv02d.h"
  39
  40 #define DRIVER_NAME     "lis3lv02d"
  41
  42 /* joystick device poll interval in milliseconds */
  43 #define MDPS_POLL_INTERVAL 50
  44 /*
  45  * The sensor can also generate interrupts (DRDY) but it's pretty pointless
  46  * because they are generated even if the data do not change. So it's better
  47  * to keep the interrupt for the free-fall event. The values are updated at
  48  * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
  49  * some low processor, we poll the sensor only at 20Hz... enough for the
  50  * joystick.
  51  */
  52
  53 #define LIS3_PWRON_DELAY_WAI_12B        (5000)
  54 #define LIS3_PWRON_DELAY_WAI_8B         (3000)
  55
  56 /*
  57  * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
  58  * LIS302D spec says: 18 mG / digit
  59  * LIS3_ACCURACY is used to increase accuracy of the intermediate
  60  * calculation results.
  61  */
  62 #define LIS3_ACCURACY                   1024
  63 /* Sensitivity values for -2G +2G scale */
  64 #define LIS3_SENSITIVITY_12B            ((LIS3_ACCURACY * 1000) / 1024)
  65 #define LIS3_SENSITIVITY_8B             (18 * LIS3_ACCURACY)
  66
  67 #define LIS3_DEFAULT_FUZZ               3
  68 #define LIS3_DEFAULT_FLAT               3
  69
  70 struct lis3lv02d lis3_dev = {
  71         .misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
  72 };
  73
  74 EXPORT_SYMBOL_GPL(lis3_dev);
  75
  76 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
  77 {
  78         s8 lo;
  79         if (lis3->read(lis3, reg, &lo) < 0)
  80                 return 0;
  81
  82         return lo;
  83 }
  84
  85 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
  86 {
  87         u8 lo, hi;
  88
  89         lis3->read(lis3, reg - 1, &lo);
  90         lis3->read(lis3, reg, &hi);
  91         /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
  92         return (s16)((hi << 8) | lo);
  93 }
  94
  95 /**
  96  * lis3lv02d_get_axis - For the given axis, give the value converted
  97  * @axis:      1,2,3 - can also be negative
  98  * @hw_values: raw values returned by the hardware
  99  *
 100  * Returns the converted value.
 101  */
 102 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
 103 {
 104         if (axis > 0)
 105                 return hw_values[axis - 1];
 106         else
 107                 return -hw_values[-axis - 1];
 108 }
 109
 110 /**
 111  * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 112  * @lis3: pointer to the device struct
 113  * @x:    where to store the X axis value
 114  * @y:    where to store the Y axis value
 115  * @z:    where to store the Z axis value
 116  *
 117  * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 118  */
 119 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 120 {
 121         int position[3];
 122         int i;
 123
 124         mutex_lock(&lis3->mutex);
 125         position[0] = lis3->read_data(lis3, OUTX);
 126         position[1] = lis3->read_data(lis3, OUTY);
 127         position[2] = lis3->read_data(lis3, OUTZ);
 128         mutex_unlock(&lis3->mutex);
 129
 130         for (i = 0; i < 3; i++)
 131                 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
 132
 133         *x = lis3lv02d_get_axis(lis3->ac.x, position);
 134         *y = lis3lv02d_get_axis(lis3->ac.y, position);
 135         *z = lis3lv02d_get_axis(lis3->ac.z, position);
 136 }
 137
 138 /* conversion btw sampling rate and the register values */
 139 static int lis3_12_rates[4] = {40, 160, 640, 2560};
 140 static int lis3_8_rates[2] = {100, 400};
 141
 142 /* ODR is Output Data Rate */
 143 static int lis3lv02d_get_odr(void)
 144 {
 145         u8 ctrl;
 146         int shift;
 147
 148         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 149         ctrl &= lis3_dev.odr_mask;
 150         shift = ffs(lis3_dev.odr_mask) - 1;
 151         return lis3_dev.odrs[(ctrl >> shift)];
 152 }
 153
 154 static int lis3lv02d_set_odr(int rate)
 155 {
 156         u8 ctrl;
 157         int i, len, shift;
 158
 159         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 160         ctrl &= ~lis3_dev.odr_mask;
 161         len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
 162         shift = ffs(lis3_dev.odr_mask) - 1;
 163
 164         for (i = 0; i < len; i++)
 165                 if (lis3_dev.odrs[i] == rate) {
 166                         lis3_dev.write(&lis3_dev, CTRL_REG1,
 167                                         ctrl | (i << shift));
 168                         return 0;
 169                 }
 170         return -EINVAL;
 171 }
 172
 173 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
 174 {
 175         u8 reg;
 176         s16 x, y, z;
 177         u8 selftest;
 178         int ret;
 179
 180         mutex_lock(&lis3->mutex);
 181         if (lis3_dev.whoami == WAI_12B)
 182                 selftest = CTRL1_ST;
 183         else
 184                 selftest = CTRL1_STP;
 185
 186         lis3->read(lis3, CTRL_REG1, &reg);
 187         lis3->write(lis3, CTRL_REG1, (reg | selftest));
 188         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 189
 190         /* Read directly to avoid axis remap */
 191         x = lis3->read_data(lis3, OUTX);
 192         y = lis3->read_data(lis3, OUTY);
 193         z = lis3->read_data(lis3, OUTZ);
 194
 195         /* back to normal settings */
 196         lis3->write(lis3, CTRL_REG1, reg);
 197         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 198
 199         results[0] = x - lis3->read_data(lis3, OUTX);
 200         results[1] = y - lis3->read_data(lis3, OUTY);
 201         results[2] = z - lis3->read_data(lis3, OUTZ);
 202
 203         ret = 0;
 204         if (lis3->pdata) {
 205                 int i;
 206                 for (i = 0; i < 3; i++) {
 207                         /* Check against selftest acceptance limits */
 208                         if ((results[i] < lis3->pdata->st_min_limits[i]) ||
 209                             (results[i] > lis3->pdata->st_max_limits[i])) {
 210                                 ret = -EIO;
 211                                 goto fail;
 212                         }
 213                 }
 214         }
 215
 216         /* test passed */
 217 fail:
 218         mutex_unlock(&lis3->mutex);
 219         return ret;
 220 }
 221
 222 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
 223 {
 224         /* disable X,Y,Z axis and power down */
 225         lis3->write(lis3, CTRL_REG1, 0x00);
 226 }
 227 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
 228
 229 void lis3lv02d_poweron(struct lis3lv02d *lis3)
 230 {
 231         u8 reg;
 232
 233         lis3->init(lis3);
 234
 235         /* LIS3 power on delay is quite long */
 236         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 237
 238         /*
 239          * Common configuration
 240          * BDU: (12 bits sensors only) LSB and MSB values are not updated until
 241          *      both have been read. So the value read will always be correct.
 242          */
 243         if (lis3->whoami ==  WAI_12B) {
 244                 lis3->read(lis3, CTRL_REG2, &reg);
 245                 reg |= CTRL2_BDU;
 246                 lis3->write(lis3, CTRL_REG2, reg);
 247         }
 248 }
 249 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
 250
 251
 252 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
 253 {
 254         /*
 255          * Be careful: on some HP laptops the bios force DD when on battery and
 256          * the lid is closed. This leads to interrupts as soon as a little move
 257          * is done.
 258          */
 259         atomic_inc(&lis3_dev.count);
 260
 261         wake_up_interruptible(&lis3_dev.misc_wait);
 262         kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
 263         return IRQ_HANDLED;
 264 }
 265
 266 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
 267 {
 268         int ret;
 269
 270         if (test_and_set_bit(0, &lis3_dev.misc_opened))
 271                 return -EBUSY; /* already open */
 272
 273         atomic_set(&lis3_dev.count, 0);
 274
 275         /*
 276          * The sensor can generate interrupts for free-fall and direction
 277          * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
 278          * the things simple and _fast_ we activate it only for free-fall, so
 279          * no need to read register (very slow with ACPI). For the same reason,
 280          * we forbid shared interrupts.
 281          *
 282          * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
 283          * io-apic is not configurable (and generates a warning) but I keep it
 284          * in case of support for other hardware.
 285          */
 286         ret = request_irq(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING,
 287                           DRIVER_NAME, &lis3_dev);
 288
 289         if (ret) {
 290                 clear_bit(0, &lis3_dev.misc_opened);
 291                 printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq);
 292                 return -EBUSY;
 293         }
 294         return 0;
 295 }
 296
 297 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
 298 {
 299         fasync_helper(-1, file, 0, &lis3_dev.async_queue);
 300         free_irq(lis3_dev.irq, &lis3_dev);
 301         clear_bit(0, &lis3_dev.misc_opened); /* release the device */
 302         return 0;
 303 }
 304
 305 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
 306                                 size_t count, loff_t *pos)
 307 {
 308         DECLARE_WAITQUEUE(wait, current);
 309         u32 data;
 310         unsigned char byte_data;
 311         ssize_t retval = 1;
 312
 313         if (count < 1)
 314                 return -EINVAL;
 315
 316         add_wait_queue(&lis3_dev.misc_wait, &wait);
 317         while (true) {
 318                 set_current_state(TASK_INTERRUPTIBLE);
 319                 data = atomic_xchg(&lis3_dev.count, 0);
 320                 if (data)
 321                         break;
 322
 323                 if (file->f_flags & O_NONBLOCK) {
 324                         retval = -EAGAIN;
 325                         goto out;
 326                 }
 327
 328                 if (signal_pending(current)) {
 329                         retval = -ERESTARTSYS;
 330                         goto out;
 331                 }
 332
 333                 schedule();
 334         }
 335
 336         if (data < 255)
 337                 byte_data = data;
 338         else
 339                 byte_data = 255;
 340
 341         /* make sure we are not going into copy_to_user() with
 342          * TASK_INTERRUPTIBLE state */
 343         set_current_state(TASK_RUNNING);
 344         if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
 345                 retval = -EFAULT;
 346
 347 out:
 348         __set_current_state(TASK_RUNNING);
 349         remove_wait_queue(&lis3_dev.misc_wait, &wait);
 350
 351         return retval;
 352 }
 353
 354 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
 355 {
 356         poll_wait(file, &lis3_dev.misc_wait, wait);
 357         if (atomic_read(&lis3_dev.count))
 358                 return POLLIN | POLLRDNORM;
 359         return 0;
 360 }
 361
 362 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
 363 {
 364         return fasync_helper(fd, file, on, &lis3_dev.async_queue);
 365 }
 366
 367 static const struct file_operations lis3lv02d_misc_fops = {
 368         .owner   = THIS_MODULE,
 369         .llseek  = no_llseek,
 370         .read    = lis3lv02d_misc_read,
 371         .open    = lis3lv02d_misc_open,
 372         .release = lis3lv02d_misc_release,
 373         .poll    = lis3lv02d_misc_poll,
 374         .fasync  = lis3lv02d_misc_fasync,
 375 };
 376
 377 static struct miscdevice lis3lv02d_misc_device = {
 378         .minor   = MISC_DYNAMIC_MINOR,
 379         .name    = "freefall",
 380         .fops    = &lis3lv02d_misc_fops,
 381 };
 382
 383 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
 384 {
 385         int x, y, z;
 386
 387         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 388         input_report_abs(pidev->input, ABS_X, x);
 389         input_report_abs(pidev->input, ABS_Y, y);
 390         input_report_abs(pidev->input, ABS_Z, z);
 391         input_sync(pidev->input);
 392 }
 393
 394 int lis3lv02d_joystick_enable(void)
 395 {
 396         struct input_dev *input_dev;
 397         int err;
 398         int max_val, fuzz, flat;
 399
 400         if (lis3_dev.idev)
 401                 return -EINVAL;
 402
 403         lis3_dev.idev = input_allocate_polled_device();
 404         if (!lis3_dev.idev)
 405                 return -ENOMEM;
 406
 407         lis3_dev.idev->poll = lis3lv02d_joystick_poll;
 408         lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
 409         input_dev = lis3_dev.idev->input;
 410
 411         input_dev->name       = "ST LIS3LV02DL Accelerometer";
 412         input_dev->phys       = DRIVER_NAME "/input0";
 413         input_dev->id.bustype = BUS_HOST;
 414         input_dev->id.vendor  = 0;
 415         input_dev->dev.parent = &lis3_dev.pdev->dev;
 416
 417         set_bit(EV_ABS, input_dev->evbit);
 418         max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
 419         fuzz = (LIS3_DEFAULT_FUZZ * lis3_dev.scale) / LIS3_ACCURACY;
 420         flat = (LIS3_DEFAULT_FLAT * lis3_dev.scale) / LIS3_ACCURACY;
 421         input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
 422         input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
 423         input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
 424
 425         err = input_register_polled_device(lis3_dev.idev);
 426         if (err) {
 427                 input_free_polled_device(lis3_dev.idev);
 428                 lis3_dev.idev = NULL;
 429         }
 430
 431         return err;
 432 }
 433 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
 434
 435 void lis3lv02d_joystick_disable(void)
 436 {
 437         if (!lis3_dev.idev)
 438                 return;
 439
 440         if (lis3_dev.irq)
 441                 misc_deregister(&lis3lv02d_misc_device);
 442         input_unregister_polled_device(lis3_dev.idev);
 443         input_free_polled_device(lis3_dev.idev);
 444         lis3_dev.idev = NULL;
 445 }
 446 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
 447
 448 /* Sysfs stuff */
 449 static ssize_t lis3lv02d_selftest_show(struct device *dev,
 450                                 struct device_attribute *attr, char *buf)
 451 {
 452         int result;
 453         s16 values[3];
 454
 455         result = lis3lv02d_selftest(&lis3_dev, values);
 456         return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
 457                 values[0], values[1], values[2]);
 458 }
 459
 460 static ssize_t lis3lv02d_position_show(struct device *dev,
 461                                 struct device_attribute *attr, char *buf)
 462 {
 463         int x, y, z;
 464
 465         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 466         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 467 }
 468
 469 static ssize_t lis3lv02d_rate_show(struct device *dev,
 470                         struct device_attribute *attr, char *buf)
 471 {
 472         return sprintf(buf, "%d\n", lis3lv02d_get_odr());
 473 }
 474
 475 static ssize_t lis3lv02d_rate_set(struct device *dev,
 476                                 struct device_attribute *attr, const char *buf,
 477                                 size_t count)
 478 {
 479         unsigned long rate;
 480
 481         if (strict_strtoul(buf, 0, &rate))
 482                 return -EINVAL;
 483
 484         if (lis3lv02d_set_odr(rate))
 485                 return -EINVAL;
 486
 487         return count;
 488 }
 489
 490 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
 491 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
 492 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
 493                                             lis3lv02d_rate_set);
 494
 495 static struct attribute *lis3lv02d_attributes[] = {
 496         &dev_attr_selftest.attr,
 497         &dev_attr_position.attr,
 498         &dev_attr_rate.attr,
 499         NULL
 500 };
 501
 502 static struct attribute_group lis3lv02d_attribute_group = {
 503         .attrs = lis3lv02d_attributes
 504 };
 505
 506
 507 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 508 {
 509         lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 510         if (IS_ERR(lis3->pdev))
 511                 return PTR_ERR(lis3->pdev);
 512
 513         return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 514 }
 515
 516 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
 517 {
 518         sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 519         platform_device_unregister(lis3->pdev);
 520         return 0;
 521 }
 522 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
 523
 524 /*
 525  * Initialise the accelerometer and the various subsystems.
 526  * Should be rather independent of the bus system.
 527  */
 528 int lis3lv02d_init_device(struct lis3lv02d *dev)
 529 {
 530         dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
 531
 532         switch (dev->whoami) {
 533         case WAI_12B:
 534                 printk(KERN_INFO DRIVER_NAME ": 12 bits sensor found\n");
 535                 dev->read_data = lis3lv02d_read_12;
 536                 dev->mdps_max_val = 2048;
 537                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
 538                 dev->odrs = lis3_12_rates;
 539                 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
 540                 dev->scale = LIS3_SENSITIVITY_12B;
 541                 break;
 542         case WAI_8B:
 543                 printk(KERN_INFO DRIVER_NAME ": 8 bits sensor found\n");
 544                 dev->read_data = lis3lv02d_read_8;
 545                 dev->mdps_max_val = 128;
 546                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
 547                 dev->odrs = lis3_8_rates;
 548                 dev->odr_mask = CTRL1_DR;
 549                 dev->scale = LIS3_SENSITIVITY_8B;
 550                 break;
 551         default:
 552                 printk(KERN_ERR DRIVER_NAME
 553                         ": unknown sensor type 0x%X\n", dev->whoami);
 554                 return -EINVAL;
 555         }
 556
 557         mutex_init(&dev->mutex);
 558
 559         lis3lv02d_add_fs(dev);
 560         lis3lv02d_poweron(dev);
 561
 562         if (lis3lv02d_joystick_enable())
 563                 printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
 564
 565         /* passing in platform specific data is purely optional and only
 566          * used by the SPI transport layer at the moment */
 567         if (dev->pdata) {
 568                 struct lis3lv02d_platform_data *p = dev->pdata;
 569
 570                 if (p->click_flags && (dev->whoami == WAI_8B)) {
 571                         dev->write(dev, CLICK_CFG, p->click_flags);
 572                         dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
 573                         dev->write(dev, CLICK_LATENCY, p->click_latency);
 574                         dev->write(dev, CLICK_WINDOW, p->click_window);
 575                         dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
 576                         dev->write(dev, CLICK_THSY_X,
 577                                         (p->click_thresh_x & 0xf) |
 578                                         (p->click_thresh_y << 4));
 579                 }
 580
 581                 if (p->wakeup_flags && (dev->whoami == WAI_8B)) {
 582                         dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
 583                         dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
 584                         /* default to 2.5ms for now */
 585                         dev->write(dev, FF_WU_DURATION_1, 1);
 586                         /* enable high pass filter for both free-fall units */
 587                         dev->write(dev, CTRL_REG2, HP_FF_WU1 | HP_FF_WU2);
 588                 }
 589
 590                 if (p->irq_cfg)
 591                         dev->write(dev, CTRL_REG3, p->irq_cfg);
 592         }
 593
 594         /* bail if we did not get an IRQ from the bus layer */
 595         if (!dev->irq) {
 596                 printk(KERN_ERR DRIVER_NAME
 597                         ": No IRQ. Disabling /dev/freefall\n");
 598                 goto out;
 599         }
 600
 601         if (misc_register(&lis3lv02d_misc_device))
 602                 printk(KERN_ERR DRIVER_NAME ": misc_register failed\n");
 603 out:
 604         return 0;
 605 }
 606 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
 607
 608 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
 609 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 610 MODULE_LICENSE("GPL");