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         if (!test_bit(0, &lis3_dev.misc_opened))
 255                 goto out;
 256
 257         /*
 258          * Be careful: on some HP laptops the bios force DD when on battery and
 259          * the lid is closed. This leads to interrupts as soon as a little move
 260          * is done.
 261          */
 262         atomic_inc(&lis3_dev.count);
 263
 264         wake_up_interruptible(&lis3_dev.misc_wait);
 265         kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
 266 out:
 267         if (lis3_dev.whoami == WAI_8B && lis3_dev.idev &&
 268             lis3_dev.idev->input->users)
 269                 return IRQ_WAKE_THREAD;
 270         return IRQ_HANDLED;
 271 }
 272
 273 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
 274 {
 275         return IRQ_HANDLED;
 276 }
 277
 278 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
 279 {
 280         return IRQ_HANDLED;
 281 }
 282
 283 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
 284 {
 285         if (test_and_set_bit(0, &lis3_dev.misc_opened))
 286                 return -EBUSY; /* already open */
 287
 288         atomic_set(&lis3_dev.count, 0);
 289         return 0;
 290 }
 291
 292 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
 293 {
 294         fasync_helper(-1, file, 0, &lis3_dev.async_queue);
 295         clear_bit(0, &lis3_dev.misc_opened); /* release the device */
 296         return 0;
 297 }
 298
 299 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
 300                                 size_t count, loff_t *pos)
 301 {
 302         DECLARE_WAITQUEUE(wait, current);
 303         u32 data;
 304         unsigned char byte_data;
 305         ssize_t retval = 1;
 306
 307         if (count < 1)
 308                 return -EINVAL;
 309
 310         add_wait_queue(&lis3_dev.misc_wait, &wait);
 311         while (true) {
 312                 set_current_state(TASK_INTERRUPTIBLE);
 313                 data = atomic_xchg(&lis3_dev.count, 0);
 314                 if (data)
 315                         break;
 316
 317                 if (file->f_flags & O_NONBLOCK) {
 318                         retval = -EAGAIN;
 319                         goto out;
 320                 }
 321
 322                 if (signal_pending(current)) {
 323                         retval = -ERESTARTSYS;
 324                         goto out;
 325                 }
 326
 327                 schedule();
 328         }
 329
 330         if (data < 255)
 331                 byte_data = data;
 332         else
 333                 byte_data = 255;
 334
 335         /* make sure we are not going into copy_to_user() with
 336          * TASK_INTERRUPTIBLE state */
 337         set_current_state(TASK_RUNNING);
 338         if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
 339                 retval = -EFAULT;
 340
 341 out:
 342         __set_current_state(TASK_RUNNING);
 343         remove_wait_queue(&lis3_dev.misc_wait, &wait);
 344
 345         return retval;
 346 }
 347
 348 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
 349 {
 350         poll_wait(file, &lis3_dev.misc_wait, wait);
 351         if (atomic_read(&lis3_dev.count))
 352                 return POLLIN | POLLRDNORM;
 353         return 0;
 354 }
 355
 356 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
 357 {
 358         return fasync_helper(fd, file, on, &lis3_dev.async_queue);
 359 }
 360
 361 static const struct file_operations lis3lv02d_misc_fops = {
 362         .owner   = THIS_MODULE,
 363         .llseek  = no_llseek,
 364         .read    = lis3lv02d_misc_read,
 365         .open    = lis3lv02d_misc_open,
 366         .release = lis3lv02d_misc_release,
 367         .poll    = lis3lv02d_misc_poll,
 368         .fasync  = lis3lv02d_misc_fasync,
 369 };
 370
 371 static struct miscdevice lis3lv02d_misc_device = {
 372         .minor   = MISC_DYNAMIC_MINOR,
 373         .name    = "freefall",
 374         .fops    = &lis3lv02d_misc_fops,
 375 };
 376
 377 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
 378 {
 379         int x, y, z;
 380
 381         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 382         input_report_abs(pidev->input, ABS_X, x);
 383         input_report_abs(pidev->input, ABS_Y, y);
 384         input_report_abs(pidev->input, ABS_Z, z);
 385         input_sync(pidev->input);
 386 }
 387
 388 int lis3lv02d_joystick_enable(void)
 389 {
 390         struct input_dev *input_dev;
 391         int err;
 392         int max_val, fuzz, flat;
 393
 394         if (lis3_dev.idev)
 395                 return -EINVAL;
 396
 397         lis3_dev.idev = input_allocate_polled_device();
 398         if (!lis3_dev.idev)
 399                 return -ENOMEM;
 400
 401         lis3_dev.idev->poll = lis3lv02d_joystick_poll;
 402         lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
 403         input_dev = lis3_dev.idev->input;
 404
 405         input_dev->name       = "ST LIS3LV02DL Accelerometer";
 406         input_dev->phys       = DRIVER_NAME "/input0";
 407         input_dev->id.bustype = BUS_HOST;
 408         input_dev->id.vendor  = 0;
 409         input_dev->dev.parent = &lis3_dev.pdev->dev;
 410
 411         set_bit(EV_ABS, input_dev->evbit);
 412         max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
 413         fuzz = (LIS3_DEFAULT_FUZZ * lis3_dev.scale) / LIS3_ACCURACY;
 414         flat = (LIS3_DEFAULT_FLAT * lis3_dev.scale) / LIS3_ACCURACY;
 415         input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
 416         input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
 417         input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
 418
 419         err = input_register_polled_device(lis3_dev.idev);
 420         if (err) {
 421                 input_free_polled_device(lis3_dev.idev);
 422                 lis3_dev.idev = NULL;
 423         }
 424
 425         return err;
 426 }
 427 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
 428
 429 void lis3lv02d_joystick_disable(void)
 430 {
 431         if (lis3_dev.irq)
 432                 free_irq(lis3_dev.irq, &lis3_dev);
 433         if (lis3_dev.pdata && lis3_dev.pdata->irq2)
 434                 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
 435
 436         if (!lis3_dev.idev)
 437                 return;
 438
 439         if (lis3_dev.irq)
 440                 misc_deregister(&lis3lv02d_misc_device);
 441         input_unregister_polled_device(lis3_dev.idev);
 442         input_free_polled_device(lis3_dev.idev);
 443         lis3_dev.idev = NULL;
 444 }
 445 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
 446
 447 /* Sysfs stuff */
 448 static ssize_t lis3lv02d_selftest_show(struct device *dev,
 449                                 struct device_attribute *attr, char *buf)
 450 {
 451         int result;
 452         s16 values[3];
 453
 454         result = lis3lv02d_selftest(&lis3_dev, values);
 455         return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
 456                 values[0], values[1], values[2]);
 457 }
 458
 459 static ssize_t lis3lv02d_position_show(struct device *dev,
 460                                 struct device_attribute *attr, char *buf)
 461 {
 462         int x, y, z;
 463
 464         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 465         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 466 }
 467
 468 static ssize_t lis3lv02d_rate_show(struct device *dev,
 469                         struct device_attribute *attr, char *buf)
 470 {
 471         return sprintf(buf, "%d\n", lis3lv02d_get_odr());
 472 }
 473
 474 static ssize_t lis3lv02d_rate_set(struct device *dev,
 475                                 struct device_attribute *attr, const char *buf,
 476                                 size_t count)
 477 {
 478         unsigned long rate;
 479
 480         if (strict_strtoul(buf, 0, &rate))
 481                 return -EINVAL;
 482
 483         if (lis3lv02d_set_odr(rate))
 484                 return -EINVAL;
 485
 486         return count;
 487 }
 488
 489 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
 490 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
 491 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
 492                                             lis3lv02d_rate_set);
 493
 494 static struct attribute *lis3lv02d_attributes[] = {
 495         &dev_attr_selftest.attr,
 496         &dev_attr_position.attr,
 497         &dev_attr_rate.attr,
 498         NULL
 499 };
 500
 501 static struct attribute_group lis3lv02d_attribute_group = {
 502         .attrs = lis3lv02d_attributes
 503 };
 504
 505
 506 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 507 {
 508         lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 509         if (IS_ERR(lis3->pdev))
 510                 return PTR_ERR(lis3->pdev);
 511
 512         return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 513 }
 514
 515 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
 516 {
 517         sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 518         platform_device_unregister(lis3->pdev);
 519         return 0;
 520 }
 521 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
 522
 523 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
 524                                 struct lis3lv02d_platform_data *p)
 525 {
 526         int err;
 527         int ctrl2 = p->hipass_ctrl;
 528
 529         if (p->click_flags) {
 530                 dev->write(dev, CLICK_CFG, p->click_flags);
 531                 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
 532                 dev->write(dev, CLICK_LATENCY, p->click_latency);
 533                 dev->write(dev, CLICK_WINDOW, p->click_window);
 534                 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
 535                 dev->write(dev, CLICK_THSY_X,
 536                         (p->click_thresh_x & 0xf) |
 537                         (p->click_thresh_y << 4));
 538         }
 539
 540         if (p->wakeup_flags) {
 541                 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
 542                 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
 543                 /* default to 2.5ms for now */
 544                 dev->write(dev, FF_WU_DURATION_1, 1);
 545                 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
 546         }
 547
 548         if (p->wakeup_flags2) {
 549                 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
 550                 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
 551                 /* default to 2.5ms for now */
 552                 dev->write(dev, FF_WU_DURATION_2, 1);
 553                 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
 554         }
 555         /* Configure hipass filters */
 556         dev->write(dev, CTRL_REG2, ctrl2);
 557
 558         if (p->irq2) {
 559                 err = request_threaded_irq(p->irq2,
 560                                         NULL,
 561                                         lis302dl_interrupt_thread2_8b,
 562                                         IRQF_TRIGGER_RISING |
 563                                         IRQF_ONESHOT,
 564                                         DRIVER_NAME, &lis3_dev);
 565                 if (err < 0)
 566                         printk(KERN_ERR DRIVER_NAME
 567                                 "No second IRQ. Limited functionality\n");
 568         }
 569 }
 570
 571 /*
 572  * Initialise the accelerometer and the various subsystems.
 573  * Should be rather independent of the bus system.
 574  */
 575 int lis3lv02d_init_device(struct lis3lv02d *dev)
 576 {
 577         int err;
 578         irq_handler_t thread_fn;
 579
 580         dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
 581
 582         switch (dev->whoami) {
 583         case WAI_12B:
 584                 printk(KERN_INFO DRIVER_NAME ": 12 bits sensor found\n");
 585                 dev->read_data = lis3lv02d_read_12;
 586                 dev->mdps_max_val = 2048;
 587                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
 588                 dev->odrs = lis3_12_rates;
 589                 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
 590                 dev->scale = LIS3_SENSITIVITY_12B;
 591                 break;
 592         case WAI_8B:
 593                 printk(KERN_INFO DRIVER_NAME ": 8 bits sensor found\n");
 594                 dev->read_data = lis3lv02d_read_8;
 595                 dev->mdps_max_val = 128;
 596                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
 597                 dev->odrs = lis3_8_rates;
 598                 dev->odr_mask = CTRL1_DR;
 599                 dev->scale = LIS3_SENSITIVITY_8B;
 600                 break;
 601         default:
 602                 printk(KERN_ERR DRIVER_NAME
 603                         ": unknown sensor type 0x%X\n", dev->whoami);
 604                 return -EINVAL;
 605         }
 606
 607         mutex_init(&dev->mutex);
 608
 609         lis3lv02d_add_fs(dev);
 610         lis3lv02d_poweron(dev);
 611
 612         if (lis3lv02d_joystick_enable())
 613                 printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
 614
 615         /* passing in platform specific data is purely optional and only
 616          * used by the SPI transport layer at the moment */
 617         if (dev->pdata) {
 618                 struct lis3lv02d_platform_data *p = dev->pdata;
 619
 620                 if (dev->whoami == WAI_8B)
 621                         lis3lv02d_8b_configure(dev, p);
 622
 623                 if (p->irq_cfg)
 624                         dev->write(dev, CTRL_REG3, p->irq_cfg);
 625         }
 626
 627         /* bail if we did not get an IRQ from the bus layer */
 628         if (!dev->irq) {
 629                 printk(KERN_ERR DRIVER_NAME
 630                         ": No IRQ. Disabling /dev/freefall\n");
 631                 goto out;
 632         }
 633
 634         /*
 635          * The sensor can generate interrupts for free-fall and direction
 636          * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
 637          * the things simple and _fast_ we activate it only for free-fall, so
 638          * no need to read register (very slow with ACPI). For the same reason,
 639          * we forbid shared interrupts.
 640          *
 641          * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
 642          * io-apic is not configurable (and generates a warning) but I keep it
 643          * in case of support for other hardware.
 644          */
 645         if (dev->whoami == WAI_8B)
 646                 thread_fn = lis302dl_interrupt_thread1_8b;
 647         else
 648                 thread_fn = NULL;
 649
 650         err = request_threaded_irq(dev->irq, lis302dl_interrupt,
 651                                 thread_fn,
 652                                 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 653                                 DRIVER_NAME, &lis3_dev);
 654
 655         if (err < 0) {
 656                 printk(KERN_ERR DRIVER_NAME "Cannot get IRQ\n");
 657                 goto out;
 658         }
 659
 660         if (misc_register(&lis3lv02d_misc_device))
 661                 printk(KERN_ERR DRIVER_NAME ": misc_register failed\n");
 662 out:
 663         return 0;
 664 }
 665 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
 666
 667 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
 668 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 669 MODULE_LICENSE("GPL");