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 #define MDPS_POLL_MIN      0
  45 #define MDPS_POLL_MAX      2000
  46 /*
  47  * The sensor can also generate interrupts (DRDY) but it's pretty pointless
  48  * because they are generated even if the data do not change. So it's better
  49  * to keep the interrupt for the free-fall event. The values are updated at
  50  * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
  51  * some low processor, we poll the sensor only at 20Hz... enough for the
  52  * joystick.
  53  */
  54
  55 #define LIS3_PWRON_DELAY_WAI_12B        (5000)
  56 #define LIS3_PWRON_DELAY_WAI_8B         (3000)
  57
  58 /*
  59  * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
  60  * LIS302D spec says: 18 mG / digit
  61  * LIS3_ACCURACY is used to increase accuracy of the intermediate
  62  * calculation results.
  63  */
  64 #define LIS3_ACCURACY                   1024
  65 /* Sensitivity values for -2G +2G scale */
  66 #define LIS3_SENSITIVITY_12B            ((LIS3_ACCURACY * 1000) / 1024)
  67 #define LIS3_SENSITIVITY_8B             (18 * LIS3_ACCURACY)
  68
  69 #define LIS3_DEFAULT_FUZZ               3
  70 #define LIS3_DEFAULT_FLAT               3
  71
  72 struct lis3lv02d lis3_dev = {
  73         .misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
  74 };
  75
  76 EXPORT_SYMBOL_GPL(lis3_dev);
  77
  78 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
  79 {
  80         s8 lo;
  81         if (lis3->read(lis3, reg, &lo) < 0)
  82                 return 0;
  83
  84         return lo;
  85 }
  86
  87 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
  88 {
  89         u8 lo, hi;
  90
  91         lis3->read(lis3, reg - 1, &lo);
  92         lis3->read(lis3, reg, &hi);
  93         /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
  94         return (s16)((hi << 8) | lo);
  95 }
  96
  97 /**
  98  * lis3lv02d_get_axis - For the given axis, give the value converted
  99  * @axis:      1,2,3 - can also be negative
 100  * @hw_values: raw values returned by the hardware
 101  *
 102  * Returns the converted value.
 103  */
 104 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
 105 {
 106         if (axis > 0)
 107                 return hw_values[axis - 1];
 108         else
 109                 return -hw_values[-axis - 1];
 110 }
 111
 112 /**
 113  * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 114  * @lis3: pointer to the device struct
 115  * @x:    where to store the X axis value
 116  * @y:    where to store the Y axis value
 117  * @z:    where to store the Z axis value
 118  *
 119  * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 120  */
 121 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 122 {
 123         int position[3];
 124         int i;
 125
 126         position[0] = lis3->read_data(lis3, OUTX);
 127         position[1] = lis3->read_data(lis3, OUTY);
 128         position[2] = lis3->read_data(lis3, OUTZ);
 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 void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
 253 {
 254         int x, y, z;
 255
 256         mutex_lock(&lis3_dev.mutex);
 257         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 258         input_report_abs(pidev->input, ABS_X, x);
 259         input_report_abs(pidev->input, ABS_Y, y);
 260         input_report_abs(pidev->input, ABS_Z, z);
 261         input_sync(pidev->input);
 262         mutex_unlock(&lis3_dev.mutex);
 263 }
 264
 265 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
 266 {
 267         if (!test_bit(0, &lis3_dev.misc_opened))
 268                 goto out;
 269
 270         /*
 271          * Be careful: on some HP laptops the bios force DD when on battery and
 272          * the lid is closed. This leads to interrupts as soon as a little move
 273          * is done.
 274          */
 275         atomic_inc(&lis3_dev.count);
 276
 277         wake_up_interruptible(&lis3_dev.misc_wait);
 278         kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
 279 out:
 280         if (lis3_dev.whoami == WAI_8B && lis3_dev.idev &&
 281             lis3_dev.idev->input->users)
 282                 return IRQ_WAKE_THREAD;
 283         return IRQ_HANDLED;
 284 }
 285
 286 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
 287 {
 288         struct input_dev *dev = lis3->idev->input;
 289         u8 click_src;
 290
 291         mutex_lock(&lis3->mutex);
 292         lis3->read(lis3, CLICK_SRC, &click_src);
 293
 294         if (click_src & CLICK_SINGLE_X) {
 295                 input_report_key(dev, lis3->mapped_btns[0], 1);
 296                 input_report_key(dev, lis3->mapped_btns[0], 0);
 297         }
 298
 299         if (click_src & CLICK_SINGLE_Y) {
 300                 input_report_key(dev, lis3->mapped_btns[1], 1);
 301                 input_report_key(dev, lis3->mapped_btns[1], 0);
 302         }
 303
 304         if (click_src & CLICK_SINGLE_Z) {
 305                 input_report_key(dev, lis3->mapped_btns[2], 1);
 306                 input_report_key(dev, lis3->mapped_btns[2], 0);
 307         }
 308         input_sync(dev);
 309         mutex_unlock(&lis3->mutex);
 310 }
 311
 312 static void lis302dl_interrupt_handle_ff_wu(struct lis3lv02d *lis3)
 313 {
 314         u8 wu1_src;
 315         u8 wu2_src;
 316
 317         lis3->read(lis3, FF_WU_SRC_1, &wu1_src);
 318         lis3->read(lis3, FF_WU_SRC_2, &wu2_src);
 319
 320         wu1_src = wu1_src & FF_WU_SRC_IA ? wu1_src : 0;
 321         wu2_src = wu2_src & FF_WU_SRC_IA ? wu2_src : 0;
 322
 323         /* joystick poll is internally protected by the lis3->mutex. */
 324         if (wu1_src || wu2_src)
 325                 lis3lv02d_joystick_poll(lis3_dev.idev);
 326 }
 327
 328 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
 329 {
 330
 331         struct lis3lv02d *lis3 = data;
 332
 333         if ((lis3->pdata->irq_cfg & LIS3_IRQ1_MASK) == LIS3_IRQ1_CLICK)
 334                 lis302dl_interrupt_handle_click(lis3);
 335         else
 336                 lis302dl_interrupt_handle_ff_wu(lis3);
 337
 338         return IRQ_HANDLED;
 339 }
 340
 341 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
 342 {
 343
 344         struct lis3lv02d *lis3 = data;
 345
 346         if ((lis3->pdata->irq_cfg & LIS3_IRQ2_MASK) == LIS3_IRQ2_CLICK)
 347                 lis302dl_interrupt_handle_click(lis3);
 348         else
 349                 lis302dl_interrupt_handle_ff_wu(lis3);
 350
 351         return IRQ_HANDLED;
 352 }
 353
 354 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
 355 {
 356         if (test_and_set_bit(0, &lis3_dev.misc_opened))
 357                 return -EBUSY; /* already open */
 358
 359         atomic_set(&lis3_dev.count, 0);
 360         return 0;
 361 }
 362
 363 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
 364 {
 365         fasync_helper(-1, file, 0, &lis3_dev.async_queue);
 366         clear_bit(0, &lis3_dev.misc_opened); /* release the device */
 367         return 0;
 368 }
 369
 370 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
 371                                 size_t count, loff_t *pos)
 372 {
 373         DECLARE_WAITQUEUE(wait, current);
 374         u32 data;
 375         unsigned char byte_data;
 376         ssize_t retval = 1;
 377
 378         if (count < 1)
 379                 return -EINVAL;
 380
 381         add_wait_queue(&lis3_dev.misc_wait, &wait);
 382         while (true) {
 383                 set_current_state(TASK_INTERRUPTIBLE);
 384                 data = atomic_xchg(&lis3_dev.count, 0);
 385                 if (data)
 386                         break;
 387
 388                 if (file->f_flags & O_NONBLOCK) {
 389                         retval = -EAGAIN;
 390                         goto out;
 391                 }
 392
 393                 if (signal_pending(current)) {
 394                         retval = -ERESTARTSYS;
 395                         goto out;
 396                 }
 397
 398                 schedule();
 399         }
 400
 401         if (data < 255)
 402                 byte_data = data;
 403         else
 404                 byte_data = 255;
 405
 406         /* make sure we are not going into copy_to_user() with
 407          * TASK_INTERRUPTIBLE state */
 408         set_current_state(TASK_RUNNING);
 409         if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
 410                 retval = -EFAULT;
 411
 412 out:
 413         __set_current_state(TASK_RUNNING);
 414         remove_wait_queue(&lis3_dev.misc_wait, &wait);
 415
 416         return retval;
 417 }
 418
 419 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
 420 {
 421         poll_wait(file, &lis3_dev.misc_wait, wait);
 422         if (atomic_read(&lis3_dev.count))
 423                 return POLLIN | POLLRDNORM;
 424         return 0;
 425 }
 426
 427 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
 428 {
 429         return fasync_helper(fd, file, on, &lis3_dev.async_queue);
 430 }
 431
 432 static const struct file_operations lis3lv02d_misc_fops = {
 433         .owner   = THIS_MODULE,
 434         .llseek  = no_llseek,
 435         .read    = lis3lv02d_misc_read,
 436         .open    = lis3lv02d_misc_open,
 437         .release = lis3lv02d_misc_release,
 438         .poll    = lis3lv02d_misc_poll,
 439         .fasync  = lis3lv02d_misc_fasync,
 440 };
 441
 442 static struct miscdevice lis3lv02d_misc_device = {
 443         .minor   = MISC_DYNAMIC_MINOR,
 444         .name    = "freefall",
 445         .fops    = &lis3lv02d_misc_fops,
 446 };
 447
 448 int lis3lv02d_joystick_enable(void)
 449 {
 450         struct input_dev *input_dev;
 451         int err;
 452         int max_val, fuzz, flat;
 453         int btns[] = {BTN_X, BTN_Y, BTN_Z};
 454
 455         if (lis3_dev.idev)
 456                 return -EINVAL;
 457
 458         lis3_dev.idev = input_allocate_polled_device();
 459         if (!lis3_dev.idev)
 460                 return -ENOMEM;
 461
 462         lis3_dev.idev->poll = lis3lv02d_joystick_poll;
 463         lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
 464         lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
 465         lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
 466         input_dev = lis3_dev.idev->input;
 467
 468         input_dev->name       = "ST LIS3LV02DL Accelerometer";
 469         input_dev->phys       = DRIVER_NAME "/input0";
 470         input_dev->id.bustype = BUS_HOST;
 471         input_dev->id.vendor  = 0;
 472         input_dev->dev.parent = &lis3_dev.pdev->dev;
 473
 474         set_bit(EV_ABS, input_dev->evbit);
 475         max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
 476         fuzz = (LIS3_DEFAULT_FUZZ * lis3_dev.scale) / LIS3_ACCURACY;
 477         flat = (LIS3_DEFAULT_FLAT * lis3_dev.scale) / LIS3_ACCURACY;
 478         input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
 479         input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
 480         input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
 481
 482         lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
 483         lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
 484         lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
 485
 486         err = input_register_polled_device(lis3_dev.idev);
 487         if (err) {
 488                 input_free_polled_device(lis3_dev.idev);
 489                 lis3_dev.idev = NULL;
 490         }
 491
 492         return err;
 493 }
 494 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
 495
 496 void lis3lv02d_joystick_disable(void)
 497 {
 498         if (lis3_dev.irq)
 499                 free_irq(lis3_dev.irq, &lis3_dev);
 500         if (lis3_dev.pdata && lis3_dev.pdata->irq2)
 501                 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
 502
 503         if (!lis3_dev.idev)
 504                 return;
 505
 506         if (lis3_dev.irq)
 507                 misc_deregister(&lis3lv02d_misc_device);
 508         input_unregister_polled_device(lis3_dev.idev);
 509         input_free_polled_device(lis3_dev.idev);
 510         lis3_dev.idev = NULL;
 511 }
 512 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
 513
 514 /* Sysfs stuff */
 515 static ssize_t lis3lv02d_selftest_show(struct device *dev,
 516                                 struct device_attribute *attr, char *buf)
 517 {
 518         int result;
 519         s16 values[3];
 520
 521         result = lis3lv02d_selftest(&lis3_dev, values);
 522         return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
 523                 values[0], values[1], values[2]);
 524 }
 525
 526 static ssize_t lis3lv02d_position_show(struct device *dev,
 527                                 struct device_attribute *attr, char *buf)
 528 {
 529         int x, y, z;
 530
 531         mutex_lock(&lis3_dev.mutex);
 532         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 533         mutex_unlock(&lis3_dev.mutex);
 534         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 535 }
 536
 537 static ssize_t lis3lv02d_rate_show(struct device *dev,
 538                         struct device_attribute *attr, char *buf)
 539 {
 540         return sprintf(buf, "%d\n", lis3lv02d_get_odr());
 541 }
 542
 543 static ssize_t lis3lv02d_rate_set(struct device *dev,
 544                                 struct device_attribute *attr, const char *buf,
 545                                 size_t count)
 546 {
 547         unsigned long rate;
 548
 549         if (strict_strtoul(buf, 0, &rate))
 550                 return -EINVAL;
 551
 552         if (lis3lv02d_set_odr(rate))
 553                 return -EINVAL;
 554
 555         return count;
 556 }
 557
 558 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
 559 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
 560 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
 561                                             lis3lv02d_rate_set);
 562
 563 static struct attribute *lis3lv02d_attributes[] = {
 564         &dev_attr_selftest.attr,
 565         &dev_attr_position.attr,
 566         &dev_attr_rate.attr,
 567         NULL
 568 };
 569
 570 static struct attribute_group lis3lv02d_attribute_group = {
 571         .attrs = lis3lv02d_attributes
 572 };
 573
 574
 575 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 576 {
 577         lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 578         if (IS_ERR(lis3->pdev))
 579                 return PTR_ERR(lis3->pdev);
 580
 581         return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 582 }
 583
 584 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
 585 {
 586         sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 587         platform_device_unregister(lis3->pdev);
 588         return 0;
 589 }
 590 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
 591
 592 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
 593                                 struct lis3lv02d_platform_data *p)
 594 {
 595         int err;
 596         int ctrl2 = p->hipass_ctrl;
 597
 598         if (p->click_flags) {
 599                 dev->write(dev, CLICK_CFG, p->click_flags);
 600                 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
 601                 dev->write(dev, CLICK_LATENCY, p->click_latency);
 602                 dev->write(dev, CLICK_WINDOW, p->click_window);
 603                 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
 604                 dev->write(dev, CLICK_THSY_X,
 605                         (p->click_thresh_x & 0xf) |
 606                         (p->click_thresh_y << 4));
 607
 608                 if (dev->idev) {
 609                         struct input_dev *input_dev = lis3_dev.idev->input;
 610                         input_set_capability(input_dev, EV_KEY, BTN_X);
 611                         input_set_capability(input_dev, EV_KEY, BTN_Y);
 612                         input_set_capability(input_dev, EV_KEY, BTN_Z);
 613                 }
 614         }
 615
 616         if (p->wakeup_flags) {
 617                 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
 618                 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
 619                 /* default to 2.5ms for now */
 620                 dev->write(dev, FF_WU_DURATION_1, 1);
 621                 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
 622         }
 623
 624         if (p->wakeup_flags2) {
 625                 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
 626                 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
 627                 /* default to 2.5ms for now */
 628                 dev->write(dev, FF_WU_DURATION_2, 1);
 629                 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
 630         }
 631         /* Configure hipass filters */
 632         dev->write(dev, CTRL_REG2, ctrl2);
 633
 634         if (p->irq2) {
 635                 err = request_threaded_irq(p->irq2,
 636                                         NULL,
 637                                         lis302dl_interrupt_thread2_8b,
 638                                         IRQF_TRIGGER_RISING |
 639                                         IRQF_ONESHOT,
 640                                         DRIVER_NAME, &lis3_dev);
 641                 if (err < 0)
 642                         printk(KERN_ERR DRIVER_NAME
 643                                 "No second IRQ. Limited functionality\n");
 644         }
 645 }
 646
 647 /*
 648  * Initialise the accelerometer and the various subsystems.
 649  * Should be rather independent of the bus system.
 650  */
 651 int lis3lv02d_init_device(struct lis3lv02d *dev)
 652 {
 653         int err;
 654         irq_handler_t thread_fn;
 655
 656         dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
 657
 658         switch (dev->whoami) {
 659         case WAI_12B:
 660                 printk(KERN_INFO DRIVER_NAME ": 12 bits sensor found\n");
 661                 dev->read_data = lis3lv02d_read_12;
 662                 dev->mdps_max_val = 2048;
 663                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
 664                 dev->odrs = lis3_12_rates;
 665                 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
 666                 dev->scale = LIS3_SENSITIVITY_12B;
 667                 break;
 668         case WAI_8B:
 669                 printk(KERN_INFO DRIVER_NAME ": 8 bits sensor found\n");
 670                 dev->read_data = lis3lv02d_read_8;
 671                 dev->mdps_max_val = 128;
 672                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
 673                 dev->odrs = lis3_8_rates;
 674                 dev->odr_mask = CTRL1_DR;
 675                 dev->scale = LIS3_SENSITIVITY_8B;
 676                 break;
 677         default:
 678                 printk(KERN_ERR DRIVER_NAME
 679                         ": unknown sensor type 0x%X\n", dev->whoami);
 680                 return -EINVAL;
 681         }
 682
 683         mutex_init(&dev->mutex);
 684
 685         lis3lv02d_add_fs(dev);
 686         lis3lv02d_poweron(dev);
 687
 688         if (lis3lv02d_joystick_enable())
 689                 printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
 690
 691         /* passing in platform specific data is purely optional and only
 692          * used by the SPI transport layer at the moment */
 693         if (dev->pdata) {
 694                 struct lis3lv02d_platform_data *p = dev->pdata;
 695
 696                 if (dev->whoami == WAI_8B)
 697                         lis3lv02d_8b_configure(dev, p);
 698
 699                 if (p->irq_cfg)
 700                         dev->write(dev, CTRL_REG3, p->irq_cfg);
 701         }
 702
 703         /* bail if we did not get an IRQ from the bus layer */
 704         if (!dev->irq) {
 705                 printk(KERN_ERR DRIVER_NAME
 706                         ": No IRQ. Disabling /dev/freefall\n");
 707                 goto out;
 708         }
 709
 710         /*
 711          * The sensor can generate interrupts for free-fall and direction
 712          * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
 713          * the things simple and _fast_ we activate it only for free-fall, so
 714          * no need to read register (very slow with ACPI). For the same reason,
 715          * we forbid shared interrupts.
 716          *
 717          * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
 718          * io-apic is not configurable (and generates a warning) but I keep it
 719          * in case of support for other hardware.
 720          */
 721         if (dev->whoami == WAI_8B)
 722                 thread_fn = lis302dl_interrupt_thread1_8b;
 723         else
 724                 thread_fn = NULL;
 725
 726         err = request_threaded_irq(dev->irq, lis302dl_interrupt,
 727                                 thread_fn,
 728                                 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 729                                 DRIVER_NAME, &lis3_dev);
 730
 731         if (err < 0) {
 732                 printk(KERN_ERR DRIVER_NAME "Cannot get IRQ\n");
 733                 goto out;
 734         }
 735
 736         if (misc_register(&lis3lv02d_misc_device))
 737                 printk(KERN_ERR DRIVER_NAME ": misc_register failed\n");
 738 out:
 739         return 0;
 740 }
 741 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
 742
 743 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
 744 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 745 MODULE_LICENSE("GPL");