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         position[0] = lis3->read_data(lis3, OUTX);
 125         position[1] = lis3->read_data(lis3, OUTY);
 126         position[2] = lis3->read_data(lis3, OUTZ);
 127
 128         for (i = 0; i < 3; i++)
 129                 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
 130
 131         *x = lis3lv02d_get_axis(lis3->ac.x, position);
 132         *y = lis3lv02d_get_axis(lis3->ac.y, position);
 133         *z = lis3lv02d_get_axis(lis3->ac.z, position);
 134 }
 135
 136 /* conversion btw sampling rate and the register values */
 137 static int lis3_12_rates[4] = {40, 160, 640, 2560};
 138 static int lis3_8_rates[2] = {100, 400};
 139
 140 /* ODR is Output Data Rate */
 141 static int lis3lv02d_get_odr(void)
 142 {
 143         u8 ctrl;
 144         int shift;
 145
 146         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 147         ctrl &= lis3_dev.odr_mask;
 148         shift = ffs(lis3_dev.odr_mask) - 1;
 149         return lis3_dev.odrs[(ctrl >> shift)];
 150 }
 151
 152 static int lis3lv02d_set_odr(int rate)
 153 {
 154         u8 ctrl;
 155         int i, len, shift;
 156
 157         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 158         ctrl &= ~lis3_dev.odr_mask;
 159         len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
 160         shift = ffs(lis3_dev.odr_mask) - 1;
 161
 162         for (i = 0; i < len; i++)
 163                 if (lis3_dev.odrs[i] == rate) {
 164                         lis3_dev.write(&lis3_dev, CTRL_REG1,
 165                                         ctrl | (i << shift));
 166                         return 0;
 167                 }
 168         return -EINVAL;
 169 }
 170
 171 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
 172 {
 173         u8 reg;
 174         s16 x, y, z;
 175         u8 selftest;
 176         int ret;
 177
 178         mutex_lock(&lis3->mutex);
 179         if (lis3_dev.whoami == WAI_12B)
 180                 selftest = CTRL1_ST;
 181         else
 182                 selftest = CTRL1_STP;
 183
 184         lis3->read(lis3, CTRL_REG1, &reg);
 185         lis3->write(lis3, CTRL_REG1, (reg | selftest));
 186         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 187
 188         /* Read directly to avoid axis remap */
 189         x = lis3->read_data(lis3, OUTX);
 190         y = lis3->read_data(lis3, OUTY);
 191         z = lis3->read_data(lis3, OUTZ);
 192
 193         /* back to normal settings */
 194         lis3->write(lis3, CTRL_REG1, reg);
 195         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 196
 197         results[0] = x - lis3->read_data(lis3, OUTX);
 198         results[1] = y - lis3->read_data(lis3, OUTY);
 199         results[2] = z - lis3->read_data(lis3, OUTZ);
 200
 201         ret = 0;
 202         if (lis3->pdata) {
 203                 int i;
 204                 for (i = 0; i < 3; i++) {
 205                         /* Check against selftest acceptance limits */
 206                         if ((results[i] < lis3->pdata->st_min_limits[i]) ||
 207                             (results[i] > lis3->pdata->st_max_limits[i])) {
 208                                 ret = -EIO;
 209                                 goto fail;
 210                         }
 211                 }
 212         }
 213
 214         /* test passed */
 215 fail:
 216         mutex_unlock(&lis3->mutex);
 217         return ret;
 218 }
 219
 220 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
 221 {
 222         /* disable X,Y,Z axis and power down */
 223         lis3->write(lis3, CTRL_REG1, 0x00);
 224 }
 225 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
 226
 227 void lis3lv02d_poweron(struct lis3lv02d *lis3)
 228 {
 229         u8 reg;
 230
 231         lis3->init(lis3);
 232
 233         /* LIS3 power on delay is quite long */
 234         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 235
 236         /*
 237          * Common configuration
 238          * BDU: (12 bits sensors only) LSB and MSB values are not updated until
 239          *      both have been read. So the value read will always be correct.
 240          */
 241         if (lis3->whoami ==  WAI_12B) {
 242                 lis3->read(lis3, CTRL_REG2, &reg);
 243                 reg |= CTRL2_BDU;
 244                 lis3->write(lis3, CTRL_REG2, reg);
 245         }
 246 }
 247 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
 248
 249
 250 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
 251 {
 252         int x, y, z;
 253
 254         mutex_lock(&lis3_dev.mutex);
 255         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 256         input_report_abs(pidev->input, ABS_X, x);
 257         input_report_abs(pidev->input, ABS_Y, y);
 258         input_report_abs(pidev->input, ABS_Z, z);
 259         input_sync(pidev->input);
 260         mutex_unlock(&lis3_dev.mutex);
 261 }
 262
 263 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
 264 {
 265         if (!test_bit(0, &lis3_dev.misc_opened))
 266                 goto out;
 267
 268         /*
 269          * Be careful: on some HP laptops the bios force DD when on battery and
 270          * the lid is closed. This leads to interrupts as soon as a little move
 271          * is done.
 272          */
 273         atomic_inc(&lis3_dev.count);
 274
 275         wake_up_interruptible(&lis3_dev.misc_wait);
 276         kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
 277 out:
 278         if (lis3_dev.whoami == WAI_8B && lis3_dev.idev &&
 279             lis3_dev.idev->input->users)
 280                 return IRQ_WAKE_THREAD;
 281         return IRQ_HANDLED;
 282 }
 283
 284 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
 285 {
 286         struct input_dev *dev = lis3->idev->input;
 287         u8 click_src;
 288
 289         mutex_lock(&lis3->mutex);
 290         lis3->read(lis3, CLICK_SRC, &click_src);
 291
 292         if (click_src & CLICK_SINGLE_X) {
 293                 input_report_key(dev, lis3->mapped_btns[0], 1);
 294                 input_report_key(dev, lis3->mapped_btns[0], 0);
 295         }
 296
 297         if (click_src & CLICK_SINGLE_Y) {
 298                 input_report_key(dev, lis3->mapped_btns[1], 1);
 299                 input_report_key(dev, lis3->mapped_btns[1], 0);
 300         }
 301
 302         if (click_src & CLICK_SINGLE_Z) {
 303                 input_report_key(dev, lis3->mapped_btns[2], 1);
 304                 input_report_key(dev, lis3->mapped_btns[2], 0);
 305         }
 306         input_sync(dev);
 307         mutex_unlock(&lis3->mutex);
 308 }
 309
 310 static void lis302dl_interrupt_handle_ff_wu(struct lis3lv02d *lis3)
 311 {
 312         u8 wu1_src;
 313         u8 wu2_src;
 314
 315         lis3->read(lis3, FF_WU_SRC_1, &wu1_src);
 316         lis3->read(lis3, FF_WU_SRC_2, &wu2_src);
 317
 318         wu1_src = wu1_src & FF_WU_SRC_IA ? wu1_src : 0;
 319         wu2_src = wu2_src & FF_WU_SRC_IA ? wu2_src : 0;
 320
 321         /* joystick poll is internally protected by the lis3->mutex. */
 322         if (wu1_src || wu2_src)
 323                 lis3lv02d_joystick_poll(lis3_dev.idev);
 324 }
 325
 326 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
 327 {
 328
 329         struct lis3lv02d *lis3 = data;
 330
 331         if ((lis3->pdata->irq_cfg & LIS3_IRQ1_MASK) == LIS3_IRQ1_CLICK)
 332                 lis302dl_interrupt_handle_click(lis3);
 333         else
 334                 lis302dl_interrupt_handle_ff_wu(lis3);
 335
 336         return IRQ_HANDLED;
 337 }
 338
 339 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
 340 {
 341
 342         struct lis3lv02d *lis3 = data;
 343
 344         if ((lis3->pdata->irq_cfg & LIS3_IRQ2_MASK) == LIS3_IRQ2_CLICK)
 345                 lis302dl_interrupt_handle_click(lis3);
 346         else
 347                 lis302dl_interrupt_handle_ff_wu(lis3);
 348
 349         return IRQ_HANDLED;
 350 }
 351
 352 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
 353 {
 354         if (test_and_set_bit(0, &lis3_dev.misc_opened))
 355                 return -EBUSY; /* already open */
 356
 357         atomic_set(&lis3_dev.count, 0);
 358         return 0;
 359 }
 360
 361 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
 362 {
 363         fasync_helper(-1, file, 0, &lis3_dev.async_queue);
 364         clear_bit(0, &lis3_dev.misc_opened); /* release the device */
 365         return 0;
 366 }
 367
 368 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
 369                                 size_t count, loff_t *pos)
 370 {
 371         DECLARE_WAITQUEUE(wait, current);
 372         u32 data;
 373         unsigned char byte_data;
 374         ssize_t retval = 1;
 375
 376         if (count < 1)
 377                 return -EINVAL;
 378
 379         add_wait_queue(&lis3_dev.misc_wait, &wait);
 380         while (true) {
 381                 set_current_state(TASK_INTERRUPTIBLE);
 382                 data = atomic_xchg(&lis3_dev.count, 0);
 383                 if (data)
 384                         break;
 385
 386                 if (file->f_flags & O_NONBLOCK) {
 387                         retval = -EAGAIN;
 388                         goto out;
 389                 }
 390
 391                 if (signal_pending(current)) {
 392                         retval = -ERESTARTSYS;
 393                         goto out;
 394                 }
 395
 396                 schedule();
 397         }
 398
 399         if (data < 255)
 400                 byte_data = data;
 401         else
 402                 byte_data = 255;
 403
 404         /* make sure we are not going into copy_to_user() with
 405          * TASK_INTERRUPTIBLE state */
 406         set_current_state(TASK_RUNNING);
 407         if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
 408                 retval = -EFAULT;
 409
 410 out:
 411         __set_current_state(TASK_RUNNING);
 412         remove_wait_queue(&lis3_dev.misc_wait, &wait);
 413
 414         return retval;
 415 }
 416
 417 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
 418 {
 419         poll_wait(file, &lis3_dev.misc_wait, wait);
 420         if (atomic_read(&lis3_dev.count))
 421                 return POLLIN | POLLRDNORM;
 422         return 0;
 423 }
 424
 425 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
 426 {
 427         return fasync_helper(fd, file, on, &lis3_dev.async_queue);
 428 }
 429
 430 static const struct file_operations lis3lv02d_misc_fops = {
 431         .owner   = THIS_MODULE,
 432         .llseek  = no_llseek,
 433         .read    = lis3lv02d_misc_read,
 434         .open    = lis3lv02d_misc_open,
 435         .release = lis3lv02d_misc_release,
 436         .poll    = lis3lv02d_misc_poll,
 437         .fasync  = lis3lv02d_misc_fasync,
 438 };
 439
 440 static struct miscdevice lis3lv02d_misc_device = {
 441         .minor   = MISC_DYNAMIC_MINOR,
 442         .name    = "freefall",
 443         .fops    = &lis3lv02d_misc_fops,
 444 };
 445
 446 int lis3lv02d_joystick_enable(void)
 447 {
 448         struct input_dev *input_dev;
 449         int err;
 450         int max_val, fuzz, flat;
 451         int btns[] = {BTN_X, BTN_Y, BTN_Z};
 452
 453         if (lis3_dev.idev)
 454                 return -EINVAL;
 455
 456         lis3_dev.idev = input_allocate_polled_device();
 457         if (!lis3_dev.idev)
 458                 return -ENOMEM;
 459
 460         lis3_dev.idev->poll = lis3lv02d_joystick_poll;
 461         lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
 462         input_dev = lis3_dev.idev->input;
 463
 464         input_dev->name       = "ST LIS3LV02DL Accelerometer";
 465         input_dev->phys       = DRIVER_NAME "/input0";
 466         input_dev->id.bustype = BUS_HOST;
 467         input_dev->id.vendor  = 0;
 468         input_dev->dev.parent = &lis3_dev.pdev->dev;
 469
 470         set_bit(EV_ABS, input_dev->evbit);
 471         max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
 472         fuzz = (LIS3_DEFAULT_FUZZ * lis3_dev.scale) / LIS3_ACCURACY;
 473         flat = (LIS3_DEFAULT_FLAT * lis3_dev.scale) / LIS3_ACCURACY;
 474         input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
 475         input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
 476         input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
 477
 478         lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
 479         lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
 480         lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
 481
 482         err = input_register_polled_device(lis3_dev.idev);
 483         if (err) {
 484                 input_free_polled_device(lis3_dev.idev);
 485                 lis3_dev.idev = NULL;
 486         }
 487
 488         return err;
 489 }
 490 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
 491
 492 void lis3lv02d_joystick_disable(void)
 493 {
 494         if (lis3_dev.irq)
 495                 free_irq(lis3_dev.irq, &lis3_dev);
 496         if (lis3_dev.pdata && lis3_dev.pdata->irq2)
 497                 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
 498
 499         if (!lis3_dev.idev)
 500                 return;
 501
 502         if (lis3_dev.irq)
 503                 misc_deregister(&lis3lv02d_misc_device);
 504         input_unregister_polled_device(lis3_dev.idev);
 505         input_free_polled_device(lis3_dev.idev);
 506         lis3_dev.idev = NULL;
 507 }
 508 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
 509
 510 /* Sysfs stuff */
 511 static ssize_t lis3lv02d_selftest_show(struct device *dev,
 512                                 struct device_attribute *attr, char *buf)
 513 {
 514         int result;
 515         s16 values[3];
 516
 517         result = lis3lv02d_selftest(&lis3_dev, values);
 518         return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
 519                 values[0], values[1], values[2]);
 520 }
 521
 522 static ssize_t lis3lv02d_position_show(struct device *dev,
 523                                 struct device_attribute *attr, char *buf)
 524 {
 525         int x, y, z;
 526
 527         mutex_lock(&lis3_dev.mutex);
 528         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 529         mutex_unlock(&lis3_dev.mutex);
 530         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 531 }
 532
 533 static ssize_t lis3lv02d_rate_show(struct device *dev,
 534                         struct device_attribute *attr, char *buf)
 535 {
 536         return sprintf(buf, "%d\n", lis3lv02d_get_odr());
 537 }
 538
 539 static ssize_t lis3lv02d_rate_set(struct device *dev,
 540                                 struct device_attribute *attr, const char *buf,
 541                                 size_t count)
 542 {
 543         unsigned long rate;
 544
 545         if (strict_strtoul(buf, 0, &rate))
 546                 return -EINVAL;
 547
 548         if (lis3lv02d_set_odr(rate))
 549                 return -EINVAL;
 550
 551         return count;
 552 }
 553
 554 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
 555 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
 556 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
 557                                             lis3lv02d_rate_set);
 558
 559 static struct attribute *lis3lv02d_attributes[] = {
 560         &dev_attr_selftest.attr,
 561         &dev_attr_position.attr,
 562         &dev_attr_rate.attr,
 563         NULL
 564 };
 565
 566 static struct attribute_group lis3lv02d_attribute_group = {
 567         .attrs = lis3lv02d_attributes
 568 };
 569
 570
 571 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 572 {
 573         lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 574         if (IS_ERR(lis3->pdev))
 575                 return PTR_ERR(lis3->pdev);
 576
 577         return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 578 }
 579
 580 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
 581 {
 582         sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 583         platform_device_unregister(lis3->pdev);
 584         return 0;
 585 }
 586 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
 587
 588 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
 589                                 struct lis3lv02d_platform_data *p)
 590 {
 591         int err;
 592         int ctrl2 = p->hipass_ctrl;
 593
 594         if (p->click_flags) {
 595                 dev->write(dev, CLICK_CFG, p->click_flags);
 596                 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
 597                 dev->write(dev, CLICK_LATENCY, p->click_latency);
 598                 dev->write(dev, CLICK_WINDOW, p->click_window);
 599                 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
 600                 dev->write(dev, CLICK_THSY_X,
 601                         (p->click_thresh_x & 0xf) |
 602                         (p->click_thresh_y << 4));
 603
 604                 if (dev->idev) {
 605                         struct input_dev *input_dev = lis3_dev.idev->input;
 606                         input_set_capability(input_dev, EV_KEY, BTN_X);
 607                         input_set_capability(input_dev, EV_KEY, BTN_Y);
 608                         input_set_capability(input_dev, EV_KEY, BTN_Z);
 609                 }
 610         }
 611
 612         if (p->wakeup_flags) {
 613                 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
 614                 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
 615                 /* default to 2.5ms for now */
 616                 dev->write(dev, FF_WU_DURATION_1, 1);
 617                 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
 618         }
 619
 620         if (p->wakeup_flags2) {
 621                 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
 622                 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
 623                 /* default to 2.5ms for now */
 624                 dev->write(dev, FF_WU_DURATION_2, 1);
 625                 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
 626         }
 627         /* Configure hipass filters */
 628         dev->write(dev, CTRL_REG2, ctrl2);
 629
 630         if (p->irq2) {
 631                 err = request_threaded_irq(p->irq2,
 632                                         NULL,
 633                                         lis302dl_interrupt_thread2_8b,
 634                                         IRQF_TRIGGER_RISING |
 635                                         IRQF_ONESHOT,
 636                                         DRIVER_NAME, &lis3_dev);
 637                 if (err < 0)
 638                         printk(KERN_ERR DRIVER_NAME
 639                                 "No second IRQ. Limited functionality\n");
 640         }
 641 }
 642
 643 /*
 644  * Initialise the accelerometer and the various subsystems.
 645  * Should be rather independent of the bus system.
 646  */
 647 int lis3lv02d_init_device(struct lis3lv02d *dev)
 648 {
 649         int err;
 650         irq_handler_t thread_fn;
 651
 652         dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
 653
 654         switch (dev->whoami) {
 655         case WAI_12B:
 656                 printk(KERN_INFO DRIVER_NAME ": 12 bits sensor found\n");
 657                 dev->read_data = lis3lv02d_read_12;
 658                 dev->mdps_max_val = 2048;
 659                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
 660                 dev->odrs = lis3_12_rates;
 661                 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
 662                 dev->scale = LIS3_SENSITIVITY_12B;
 663                 break;
 664         case WAI_8B:
 665                 printk(KERN_INFO DRIVER_NAME ": 8 bits sensor found\n");
 666                 dev->read_data = lis3lv02d_read_8;
 667                 dev->mdps_max_val = 128;
 668                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
 669                 dev->odrs = lis3_8_rates;
 670                 dev->odr_mask = CTRL1_DR;
 671                 dev->scale = LIS3_SENSITIVITY_8B;
 672                 break;
 673         default:
 674                 printk(KERN_ERR DRIVER_NAME
 675                         ": unknown sensor type 0x%X\n", dev->whoami);
 676                 return -EINVAL;
 677         }
 678
 679         mutex_init(&dev->mutex);
 680
 681         lis3lv02d_add_fs(dev);
 682         lis3lv02d_poweron(dev);
 683
 684         if (lis3lv02d_joystick_enable())
 685                 printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
 686
 687         /* passing in platform specific data is purely optional and only
 688          * used by the SPI transport layer at the moment */
 689         if (dev->pdata) {
 690                 struct lis3lv02d_platform_data *p = dev->pdata;
 691
 692                 if (dev->whoami == WAI_8B)
 693                         lis3lv02d_8b_configure(dev, p);
 694
 695                 if (p->irq_cfg)
 696                         dev->write(dev, CTRL_REG3, p->irq_cfg);
 697         }
 698
 699         /* bail if we did not get an IRQ from the bus layer */
 700         if (!dev->irq) {
 701                 printk(KERN_ERR DRIVER_NAME
 702                         ": No IRQ. Disabling /dev/freefall\n");
 703                 goto out;
 704         }
 705
 706         /*
 707          * The sensor can generate interrupts for free-fall and direction
 708          * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
 709          * the things simple and _fast_ we activate it only for free-fall, so
 710          * no need to read register (very slow with ACPI). For the same reason,
 711          * we forbid shared interrupts.
 712          *
 713          * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
 714          * io-apic is not configurable (and generates a warning) but I keep it
 715          * in case of support for other hardware.
 716          */
 717         if (dev->whoami == WAI_8B)
 718                 thread_fn = lis302dl_interrupt_thread1_8b;
 719         else
 720                 thread_fn = NULL;
 721
 722         err = request_threaded_irq(dev->irq, lis302dl_interrupt,
 723                                 thread_fn,
 724                                 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 725                                 DRIVER_NAME, &lis3_dev);
 726
 727         if (err < 0) {
 728                 printk(KERN_ERR DRIVER_NAME "Cannot get IRQ\n");
 729                 goto out;
 730         }
 731
 732         if (misc_register(&lis3lv02d_misc_device))
 733                 printk(KERN_ERR DRIVER_NAME ": misc_register failed\n");
 734 out:
 735         return 0;
 736 }
 737 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
 738
 739 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
 740 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 741 MODULE_LICENSE("GPL");