drivers/misc/lis3lv02d/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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/kernel.h>
  26 #include <linux/init.h>
  27 #include <linux/dmi.h>
  28 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/input-polldev.h>
  33 #include <linux/delay.h>
  34 #include <linux/wait.h>
  35 #include <linux/poll.h>
  36 #include <linux/slab.h>
  37 #include <linux/freezer.h>
  38 #include <linux/uaccess.h>
  39 #include <linux/miscdevice.h>
  40 #include <linux/pm_runtime.h>
  41 #include <linux/atomic.h>
  42 #include "lis3lv02d.h"
  43
  44 #define DRIVER_NAME     "lis3lv02d"
  45
  46 /* joystick device poll interval in milliseconds */
  47 #define MDPS_POLL_INTERVAL 50
  48 #define MDPS_POLL_MIN      0
  49 #define MDPS_POLL_MAX      2000
  50
  51 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
  52
  53 #define SELFTEST_OK            0
  54 #define SELFTEST_FAIL          -1
  55 #define SELFTEST_IRQ           -2
  56
  57 #define IRQ_LINE0              0
  58 #define IRQ_LINE1              1
  59
  60 /*
  61  * The sensor can also generate interrupts (DRDY) but it's pretty pointless
  62  * because they are generated even if the data do not change. So it's better
  63  * to keep the interrupt for the free-fall event. The values are updated at
  64  * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
  65  * some low processor, we poll the sensor only at 20Hz... enough for the
  66  * joystick.
  67  */
  68
  69 #define LIS3_PWRON_DELAY_WAI_12B        (5000)
  70 #define LIS3_PWRON_DELAY_WAI_8B         (3000)
  71
  72 /*
  73  * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
  74  * LIS302D spec says: 18 mG / digit
  75  * LIS3_ACCURACY is used to increase accuracy of the intermediate
  76  * calculation results.
  77  */
  78 #define LIS3_ACCURACY                   1024
  79 /* Sensitivity values for -2G +2G scale */
  80 #define LIS3_SENSITIVITY_12B            ((LIS3_ACCURACY * 1000) / 1024)
  81 #define LIS3_SENSITIVITY_8B             (18 * LIS3_ACCURACY)
  82
  83 #define LIS3_DEFAULT_FUZZ_12B           3
  84 #define LIS3_DEFAULT_FLAT_12B           3
  85 #define LIS3_DEFAULT_FUZZ_8B            1
  86 #define LIS3_DEFAULT_FLAT_8B            1
  87
  88 struct lis3lv02d lis3_dev = {
  89         .misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
  90 };
  91 EXPORT_SYMBOL_GPL(lis3_dev);
  92
  93 /* just like param_set_int() but does sanity-check so that it won't point
  94  * over the axis array size
  95  */
  96 static int param_set_axis(const char *val, const struct kernel_param *kp)
  97 {
  98         int ret = param_set_int(val, kp);
  99         if (!ret) {
 100                 int val = *(int *)kp->arg;
 101                 if (val < 0)
 102                         val = -val;
 103                 if (!val || val > 3)
 104                         return -EINVAL;
 105         }
 106         return ret;
 107 }
 108
 109 static struct kernel_param_ops param_ops_axis = {
 110         .set = param_set_axis,
 111         .get = param_get_int,
 112 };
 113
 114 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
 115 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
 116
 117 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
 118 {
 119         s8 lo;
 120         if (lis3->read(lis3, reg, &lo) < 0)
 121                 return 0;
 122
 123         return lo;
 124 }
 125
 126 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
 127 {
 128         u8 lo, hi;
 129
 130         lis3->read(lis3, reg - 1, &lo);
 131         lis3->read(lis3, reg, &hi);
 132         /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
 133         return (s16)((hi << 8) | lo);
 134 }
 135
 136 /**
 137  * lis3lv02d_get_axis - For the given axis, give the value converted
 138  * @axis:      1,2,3 - can also be negative
 139  * @hw_values: raw values returned by the hardware
 140  *
 141  * Returns the converted value.
 142  */
 143 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
 144 {
 145         if (axis > 0)
 146                 return hw_values[axis - 1];
 147         else
 148                 return -hw_values[-axis - 1];
 149 }
 150
 151 /**
 152  * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 153  * @lis3: pointer to the device struct
 154  * @x:    where to store the X axis value
 155  * @y:    where to store the Y axis value
 156  * @z:    where to store the Z axis value
 157  *
 158  * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 159  */
 160 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 161 {
 162         int position[3];
 163         int i;
 164
 165         if (lis3->blkread) {
 166                 if (lis3_dev.whoami == WAI_12B) {
 167                         u16 data[3];
 168                         lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
 169                         for (i = 0; i < 3; i++)
 170                                 position[i] = (s16)le16_to_cpu(data[i]);
 171                 } else {
 172                         u8 data[5];
 173                         /* Data: x, dummy, y, dummy, z */
 174                         lis3->blkread(lis3, OUTX, 5, data);
 175                         for (i = 0; i < 3; i++)
 176                                 position[i] = (s8)data[i * 2];
 177                 }
 178         } else {
 179                 position[0] = lis3->read_data(lis3, OUTX);
 180                 position[1] = lis3->read_data(lis3, OUTY);
 181                 position[2] = lis3->read_data(lis3, OUTZ);
 182         }
 183
 184         for (i = 0; i < 3; i++)
 185                 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
 186
 187         *x = lis3lv02d_get_axis(lis3->ac.x, position);
 188         *y = lis3lv02d_get_axis(lis3->ac.y, position);
 189         *z = lis3lv02d_get_axis(lis3->ac.z, position);
 190 }
 191
 192 /* conversion btw sampling rate and the register values */
 193 static int lis3_12_rates[4] = {40, 160, 640, 2560};
 194 static int lis3_8_rates[2] = {100, 400};
 195 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
 196
 197 /* ODR is Output Data Rate */
 198 static int lis3lv02d_get_odr(void)
 199 {
 200         u8 ctrl;
 201         int shift;
 202
 203         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 204         ctrl &= lis3_dev.odr_mask;
 205         shift = ffs(lis3_dev.odr_mask) - 1;
 206         return lis3_dev.odrs[(ctrl >> shift)];
 207 }
 208
 209 static int lis3lv02d_set_odr(int rate)
 210 {
 211         u8 ctrl;
 212         int i, len, shift;
 213
 214         if (!rate)
 215                 return -EINVAL;
 216
 217         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 218         ctrl &= ~lis3_dev.odr_mask;
 219         len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
 220         shift = ffs(lis3_dev.odr_mask) - 1;
 221
 222         for (i = 0; i < len; i++)
 223                 if (lis3_dev.odrs[i] == rate) {
 224                         lis3_dev.write(&lis3_dev, CTRL_REG1,
 225                                         ctrl | (i << shift));
 226                         return 0;
 227                 }
 228         return -EINVAL;
 229 }
 230
 231 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
 232 {
 233         u8 ctlreg, reg;
 234         s16 x, y, z;
 235         u8 selftest;
 236         int ret;
 237         u8 ctrl_reg_data;
 238         unsigned char irq_cfg;
 239
 240         mutex_lock(&lis3->mutex);
 241
 242         irq_cfg = lis3->irq_cfg;
 243         if (lis3_dev.whoami == WAI_8B) {
 244                 lis3->data_ready_count[IRQ_LINE0] = 0;
 245                 lis3->data_ready_count[IRQ_LINE1] = 0;
 246
 247                 /* Change interrupt cfg to data ready for selftest */
 248                 atomic_inc(&lis3_dev.wake_thread);
 249                 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
 250                 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
 251                 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
 252                                 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
 253                                 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
 254         }
 255
 256         if (lis3_dev.whoami == WAI_3DC) {
 257                 ctlreg = CTRL_REG4;
 258                 selftest = CTRL4_ST0;
 259         } else {
 260                 ctlreg = CTRL_REG1;
 261                 if (lis3_dev.whoami == WAI_12B)
 262                         selftest = CTRL1_ST;
 263                 else
 264                         selftest = CTRL1_STP;
 265         }
 266
 267         lis3->read(lis3, ctlreg, &reg);
 268         lis3->write(lis3, ctlreg, (reg | selftest));
 269         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 270
 271         /* Read directly to avoid axis remap */
 272         x = lis3->read_data(lis3, OUTX);
 273         y = lis3->read_data(lis3, OUTY);
 274         z = lis3->read_data(lis3, OUTZ);
 275
 276         /* back to normal settings */
 277         lis3->write(lis3, ctlreg, reg);
 278         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 279
 280         results[0] = x - lis3->read_data(lis3, OUTX);
 281         results[1] = y - lis3->read_data(lis3, OUTY);
 282         results[2] = z - lis3->read_data(lis3, OUTZ);
 283
 284         ret = 0;
 285
 286         if (lis3_dev.whoami == WAI_8B) {
 287                 /* Restore original interrupt configuration */
 288                 atomic_dec(&lis3_dev.wake_thread);
 289                 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
 290                 lis3->irq_cfg = irq_cfg;
 291
 292                 if ((irq_cfg & LIS3_IRQ1_MASK) &&
 293                         lis3->data_ready_count[IRQ_LINE0] < 2) {
 294                         ret = SELFTEST_IRQ;
 295                         goto fail;
 296                 }
 297
 298                 if ((irq_cfg & LIS3_IRQ2_MASK) &&
 299                         lis3->data_ready_count[IRQ_LINE1] < 2) {
 300                         ret = SELFTEST_IRQ;
 301                         goto fail;
 302                 }
 303         }
 304
 305         if (lis3->pdata) {
 306                 int i;
 307                 for (i = 0; i < 3; i++) {
 308                         /* Check against selftest acceptance limits */
 309                         if ((results[i] < lis3->pdata->st_min_limits[i]) ||
 310                             (results[i] > lis3->pdata->st_max_limits[i])) {
 311                                 ret = SELFTEST_FAIL;
 312                                 goto fail;
 313                         }
 314                 }
 315         }
 316
 317         /* test passed */
 318 fail:
 319         mutex_unlock(&lis3->mutex);
 320         return ret;
 321 }
 322
 323 /*
 324  * Order of registers in the list affects to order of the restore process.
 325  * Perhaps it is a good idea to set interrupt enable register as a last one
 326  * after all other configurations
 327  */
 328 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
 329                                FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
 330                                CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
 331                                CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
 332                                CTRL_REG1, CTRL_REG2, CTRL_REG3};
 333
 334 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
 335                                FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
 336                                DD_THSE_L, DD_THSE_H,
 337                                CTRL_REG1, CTRL_REG3, CTRL_REG2};
 338
 339 static inline void lis3_context_save(struct lis3lv02d *lis3)
 340 {
 341         int i;
 342         for (i = 0; i < lis3->regs_size; i++)
 343                 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
 344         lis3->regs_stored = true;
 345 }
 346
 347 static inline void lis3_context_restore(struct lis3lv02d *lis3)
 348 {
 349         int i;
 350         if (lis3->regs_stored)
 351                 for (i = 0; i < lis3->regs_size; i++)
 352                         lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
 353 }
 354
 355 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
 356 {
 357         if (lis3->reg_ctrl)
 358                 lis3_context_save(lis3);
 359         /* disable X,Y,Z axis and power down */
 360         lis3->write(lis3, CTRL_REG1, 0x00);
 361         if (lis3->reg_ctrl)
 362                 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
 363 }
 364 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
 365
 366 void lis3lv02d_poweron(struct lis3lv02d *lis3)
 367 {
 368         u8 reg;
 369
 370         lis3->init(lis3);
 371
 372         /*
 373          * Common configuration
 374          * BDU: (12 bits sensors only) LSB and MSB values are not updated until
 375          *      both have been read. So the value read will always be correct.
 376          * Set BOOT bit to refresh factory tuning values.
 377          */
 378         lis3->read(lis3, CTRL_REG2, &reg);
 379         if (lis3->whoami ==  WAI_12B)
 380                 reg |= CTRL2_BDU | CTRL2_BOOT;
 381         else
 382                 reg |= CTRL2_BOOT_8B;
 383         lis3->write(lis3, CTRL_REG2, reg);
 384
 385         /* LIS3 power on delay is quite long */
 386         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 387
 388         if (lis3->reg_ctrl)
 389                 lis3_context_restore(lis3);
 390 }
 391 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
 392
 393
 394 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
 395 {
 396         int x, y, z;
 397
 398         mutex_lock(&lis3_dev.mutex);
 399         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 400         input_report_abs(pidev->input, ABS_X, x);
 401         input_report_abs(pidev->input, ABS_Y, y);
 402         input_report_abs(pidev->input, ABS_Z, z);
 403         input_sync(pidev->input);
 404         mutex_unlock(&lis3_dev.mutex);
 405 }
 406
 407 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
 408 {
 409         if (lis3_dev.pm_dev)
 410                 pm_runtime_get_sync(lis3_dev.pm_dev);
 411
 412         if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev)
 413                 atomic_set(&lis3_dev.wake_thread, 1);
 414         /*
 415          * Update coordinates for the case where poll interval is 0 and
 416          * the chip in running purely under interrupt control
 417          */
 418         lis3lv02d_joystick_poll(pidev);
 419 }
 420
 421 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
 422 {
 423         atomic_set(&lis3_dev.wake_thread, 0);
 424         if (lis3_dev.pm_dev)
 425                 pm_runtime_put(lis3_dev.pm_dev);
 426 }
 427
 428 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
 429 {
 430         if (!test_bit(0, &lis3_dev.misc_opened))
 431                 goto out;
 432
 433         /*
 434          * Be careful: on some HP laptops the bios force DD when on battery and
 435          * the lid is closed. This leads to interrupts as soon as a little move
 436          * is done.
 437          */
 438         atomic_inc(&lis3_dev.count);
 439
 440         wake_up_interruptible(&lis3_dev.misc_wait);
 441         kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
 442 out:
 443         if (atomic_read(&lis3_dev.wake_thread))
 444                 return IRQ_WAKE_THREAD;
 445         return IRQ_HANDLED;
 446 }
 447
 448 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
 449 {
 450         struct input_dev *dev = lis3->idev->input;
 451         u8 click_src;
 452
 453         mutex_lock(&lis3->mutex);
 454         lis3->read(lis3, CLICK_SRC, &click_src);
 455
 456         if (click_src & CLICK_SINGLE_X) {
 457                 input_report_key(dev, lis3->mapped_btns[0], 1);
 458                 input_report_key(dev, lis3->mapped_btns[0], 0);
 459         }
 460
 461         if (click_src & CLICK_SINGLE_Y) {
 462                 input_report_key(dev, lis3->mapped_btns[1], 1);
 463                 input_report_key(dev, lis3->mapped_btns[1], 0);
 464         }
 465
 466         if (click_src & CLICK_SINGLE_Z) {
 467                 input_report_key(dev, lis3->mapped_btns[2], 1);
 468                 input_report_key(dev, lis3->mapped_btns[2], 0);
 469         }
 470         input_sync(dev);
 471         mutex_unlock(&lis3->mutex);
 472 }
 473
 474 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
 475 {
 476         int dummy;
 477
 478         /* Dummy read to ack interrupt */
 479         lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
 480         lis3->data_ready_count[index]++;
 481 }
 482
 483 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
 484 {
 485         struct lis3lv02d *lis3 = data;
 486         u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
 487
 488         if (irq_cfg == LIS3_IRQ1_CLICK)
 489                 lis302dl_interrupt_handle_click(lis3);
 490         else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
 491                 lis302dl_data_ready(lis3, IRQ_LINE0);
 492         else
 493                 lis3lv02d_joystick_poll(lis3->idev);
 494
 495         return IRQ_HANDLED;
 496 }
 497
 498 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
 499 {
 500         struct lis3lv02d *lis3 = data;
 501         u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
 502
 503         if (irq_cfg == LIS3_IRQ2_CLICK)
 504                 lis302dl_interrupt_handle_click(lis3);
 505         else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
 506                 lis302dl_data_ready(lis3, IRQ_LINE1);
 507         else
 508                 lis3lv02d_joystick_poll(lis3->idev);
 509
 510         return IRQ_HANDLED;
 511 }
 512
 513 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
 514 {
 515         if (test_and_set_bit(0, &lis3_dev.misc_opened))
 516                 return -EBUSY; /* already open */
 517
 518         if (lis3_dev.pm_dev)
 519                 pm_runtime_get_sync(lis3_dev.pm_dev);
 520
 521         atomic_set(&lis3_dev.count, 0);
 522         return 0;
 523 }
 524
 525 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
 526 {
 527         fasync_helper(-1, file, 0, &lis3_dev.async_queue);
 528         clear_bit(0, &lis3_dev.misc_opened); /* release the device */
 529         if (lis3_dev.pm_dev)
 530                 pm_runtime_put(lis3_dev.pm_dev);
 531         return 0;
 532 }
 533
 534 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
 535                                 size_t count, loff_t *pos)
 536 {
 537         DECLARE_WAITQUEUE(wait, current);
 538         u32 data;
 539         unsigned char byte_data;
 540         ssize_t retval = 1;
 541
 542         if (count < 1)
 543                 return -EINVAL;
 544
 545         add_wait_queue(&lis3_dev.misc_wait, &wait);
 546         while (true) {
 547                 set_current_state(TASK_INTERRUPTIBLE);
 548                 data = atomic_xchg(&lis3_dev.count, 0);
 549                 if (data)
 550                         break;
 551
 552                 if (file->f_flags & O_NONBLOCK) {
 553                         retval = -EAGAIN;
 554                         goto out;
 555                 }
 556
 557                 if (signal_pending(current)) {
 558                         retval = -ERESTARTSYS;
 559                         goto out;
 560                 }
 561
 562                 schedule();
 563         }
 564
 565         if (data < 255)
 566                 byte_data = data;
 567         else
 568                 byte_data = 255;
 569
 570         /* make sure we are not going into copy_to_user() with
 571          * TASK_INTERRUPTIBLE state */
 572         set_current_state(TASK_RUNNING);
 573         if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
 574                 retval = -EFAULT;
 575
 576 out:
 577         __set_current_state(TASK_RUNNING);
 578         remove_wait_queue(&lis3_dev.misc_wait, &wait);
 579
 580         return retval;
 581 }
 582
 583 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
 584 {
 585         poll_wait(file, &lis3_dev.misc_wait, wait);
 586         if (atomic_read(&lis3_dev.count))
 587                 return POLLIN | POLLRDNORM;
 588         return 0;
 589 }
 590
 591 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
 592 {
 593         return fasync_helper(fd, file, on, &lis3_dev.async_queue);
 594 }
 595
 596 static const struct file_operations lis3lv02d_misc_fops = {
 597         .owner   = THIS_MODULE,
 598         .llseek  = no_llseek,
 599         .read    = lis3lv02d_misc_read,
 600         .open    = lis3lv02d_misc_open,
 601         .release = lis3lv02d_misc_release,
 602         .poll    = lis3lv02d_misc_poll,
 603         .fasync  = lis3lv02d_misc_fasync,
 604 };
 605
 606 static struct miscdevice lis3lv02d_misc_device = {
 607         .minor   = MISC_DYNAMIC_MINOR,
 608         .name    = "freefall",
 609         .fops    = &lis3lv02d_misc_fops,
 610 };
 611
 612 int lis3lv02d_joystick_enable(void)
 613 {
 614         struct input_dev *input_dev;
 615         int err;
 616         int max_val, fuzz, flat;
 617         int btns[] = {BTN_X, BTN_Y, BTN_Z};
 618
 619         if (lis3_dev.idev)
 620                 return -EINVAL;
 621
 622         lis3_dev.idev = input_allocate_polled_device();
 623         if (!lis3_dev.idev)
 624                 return -ENOMEM;
 625
 626         lis3_dev.idev->poll = lis3lv02d_joystick_poll;
 627         lis3_dev.idev->open = lis3lv02d_joystick_open;
 628         lis3_dev.idev->close = lis3lv02d_joystick_close;
 629         lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
 630         lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
 631         lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
 632         input_dev = lis3_dev.idev->input;
 633
 634         input_dev->name       = "ST LIS3LV02DL Accelerometer";
 635         input_dev->phys       = DRIVER_NAME "/input0";
 636         input_dev->id.bustype = BUS_HOST;
 637         input_dev->id.vendor  = 0;
 638         input_dev->dev.parent = &lis3_dev.pdev->dev;
 639
 640         set_bit(EV_ABS, input_dev->evbit);
 641         max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
 642         if (lis3_dev.whoami == WAI_12B) {
 643                 fuzz = LIS3_DEFAULT_FUZZ_12B;
 644                 flat = LIS3_DEFAULT_FLAT_12B;
 645         } else {
 646                 fuzz = LIS3_DEFAULT_FUZZ_8B;
 647                 flat = LIS3_DEFAULT_FLAT_8B;
 648         }
 649         fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY;
 650         flat = (flat * lis3_dev.scale) / LIS3_ACCURACY;
 651
 652         input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
 653         input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
 654         input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
 655
 656         lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
 657         lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
 658         lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
 659
 660         err = input_register_polled_device(lis3_dev.idev);
 661         if (err) {
 662                 input_free_polled_device(lis3_dev.idev);
 663                 lis3_dev.idev = NULL;
 664         }
 665
 666         return err;
 667 }
 668 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
 669
 670 void lis3lv02d_joystick_disable(void)
 671 {
 672         if (lis3_dev.irq)
 673                 free_irq(lis3_dev.irq, &lis3_dev);
 674         if (lis3_dev.pdata && lis3_dev.pdata->irq2)
 675                 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
 676
 677         if (!lis3_dev.idev)
 678                 return;
 679
 680         if (lis3_dev.irq)
 681                 misc_deregister(&lis3lv02d_misc_device);
 682         input_unregister_polled_device(lis3_dev.idev);
 683         input_free_polled_device(lis3_dev.idev);
 684         lis3_dev.idev = NULL;
 685 }
 686 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
 687
 688 /* Sysfs stuff */
 689 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
 690 {
 691         /*
 692          * SYSFS functions are fast visitors so put-call
 693          * immediately after the get-call. However, keep
 694          * chip running for a while and schedule delayed
 695          * suspend. This way periodic sysfs calls doesn't
 696          * suffer from relatively long power up time.
 697          */
 698
 699         if (lis3->pm_dev) {
 700                 pm_runtime_get_sync(lis3->pm_dev);
 701                 pm_runtime_put_noidle(lis3->pm_dev);
 702                 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
 703         }
 704 }
 705
 706 static ssize_t lis3lv02d_selftest_show(struct device *dev,
 707                                 struct device_attribute *attr, char *buf)
 708 {
 709         s16 values[3];
 710
 711         static const char ok[] = "OK";
 712         static const char fail[] = "FAIL";
 713         static const char irq[] = "FAIL_IRQ";
 714         const char *res;
 715
 716         lis3lv02d_sysfs_poweron(&lis3_dev);
 717         switch (lis3lv02d_selftest(&lis3_dev, values)) {
 718         case SELFTEST_FAIL:
 719                 res = fail;
 720                 break;
 721         case SELFTEST_IRQ:
 722                 res = irq;
 723                 break;
 724         case SELFTEST_OK:
 725         default:
 726                 res = ok;
 727                 break;
 728         }
 729         return sprintf(buf, "%s %d %d %d\n", res,
 730                 values[0], values[1], values[2]);
 731 }
 732
 733 static ssize_t lis3lv02d_position_show(struct device *dev,
 734                                 struct device_attribute *attr, char *buf)
 735 {
 736         int x, y, z;
 737
 738         lis3lv02d_sysfs_poweron(&lis3_dev);
 739         mutex_lock(&lis3_dev.mutex);
 740         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 741         mutex_unlock(&lis3_dev.mutex);
 742         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 743 }
 744
 745 static ssize_t lis3lv02d_rate_show(struct device *dev,
 746                         struct device_attribute *attr, char *buf)
 747 {
 748         lis3lv02d_sysfs_poweron(&lis3_dev);
 749         return sprintf(buf, "%d\n", lis3lv02d_get_odr());
 750 }
 751
 752 static ssize_t lis3lv02d_rate_set(struct device *dev,
 753                                 struct device_attribute *attr, const char *buf,
 754                                 size_t count)
 755 {
 756         unsigned long rate;
 757
 758         if (strict_strtoul(buf, 0, &rate))
 759                 return -EINVAL;
 760
 761         lis3lv02d_sysfs_poweron(&lis3_dev);
 762         if (lis3lv02d_set_odr(rate))
 763                 return -EINVAL;
 764
 765         return count;
 766 }
 767
 768 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
 769 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
 770 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
 771                                             lis3lv02d_rate_set);
 772
 773 static struct attribute *lis3lv02d_attributes[] = {
 774         &dev_attr_selftest.attr,
 775         &dev_attr_position.attr,
 776         &dev_attr_rate.attr,
 777         NULL
 778 };
 779
 780 static struct attribute_group lis3lv02d_attribute_group = {
 781         .attrs = lis3lv02d_attributes
 782 };
 783
 784
 785 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 786 {
 787         lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 788         if (IS_ERR(lis3->pdev))
 789                 return PTR_ERR(lis3->pdev);
 790
 791         return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 792 }
 793
 794 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
 795 {
 796         sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 797         platform_device_unregister(lis3->pdev);
 798         if (lis3->pm_dev) {
 799                 /* Barrier after the sysfs remove */
 800                 pm_runtime_barrier(lis3->pm_dev);
 801
 802                 /* SYSFS may have left chip running. Turn off if necessary */
 803                 if (!pm_runtime_suspended(lis3->pm_dev))
 804                         lis3lv02d_poweroff(&lis3_dev);
 805
 806                 pm_runtime_disable(lis3->pm_dev);
 807                 pm_runtime_set_suspended(lis3->pm_dev);
 808         }
 809         kfree(lis3->reg_cache);
 810         return 0;
 811 }
 812 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
 813
 814 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
 815                                 struct lis3lv02d_platform_data *p)
 816 {
 817         int err;
 818         int ctrl2 = p->hipass_ctrl;
 819
 820         if (p->click_flags) {
 821                 dev->write(dev, CLICK_CFG, p->click_flags);
 822                 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
 823                 dev->write(dev, CLICK_LATENCY, p->click_latency);
 824                 dev->write(dev, CLICK_WINDOW, p->click_window);
 825                 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
 826                 dev->write(dev, CLICK_THSY_X,
 827                         (p->click_thresh_x & 0xf) |
 828                         (p->click_thresh_y << 4));
 829
 830                 if (dev->idev) {
 831                         struct input_dev *input_dev = lis3_dev.idev->input;
 832                         input_set_capability(input_dev, EV_KEY, BTN_X);
 833                         input_set_capability(input_dev, EV_KEY, BTN_Y);
 834                         input_set_capability(input_dev, EV_KEY, BTN_Z);
 835                 }
 836         }
 837
 838         if (p->wakeup_flags) {
 839                 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
 840                 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
 841                 /* pdata value + 1 to keep this backward compatible*/
 842                 dev->write(dev, FF_WU_DURATION_1, p->duration1 + 1);
 843                 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
 844         }
 845
 846         if (p->wakeup_flags2) {
 847                 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
 848                 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
 849                 /* pdata value + 1 to keep this backward compatible*/
 850                 dev->write(dev, FF_WU_DURATION_2, p->duration2 + 1);
 851                 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
 852         }
 853         /* Configure hipass filters */
 854         dev->write(dev, CTRL_REG2, ctrl2);
 855
 856         if (p->irq2) {
 857                 err = request_threaded_irq(p->irq2,
 858                                         NULL,
 859                                         lis302dl_interrupt_thread2_8b,
 860                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT |
 861                                         (p->irq_flags2 & IRQF_TRIGGER_MASK),
 862                                         DRIVER_NAME, &lis3_dev);
 863                 if (err < 0)
 864                         pr_err("No second IRQ. Limited functionality\n");
 865         }
 866 }
 867
 868 /*
 869  * Initialise the accelerometer and the various subsystems.
 870  * Should be rather independent of the bus system.
 871  */
 872 int lis3lv02d_init_device(struct lis3lv02d *dev)
 873 {
 874         int err;
 875         irq_handler_t thread_fn;
 876         int irq_flags = 0;
 877
 878         dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
 879
 880         switch (dev->whoami) {
 881         case WAI_12B:
 882                 pr_info("12 bits sensor found\n");
 883                 dev->read_data = lis3lv02d_read_12;
 884                 dev->mdps_max_val = 2048;
 885                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
 886                 dev->odrs = lis3_12_rates;
 887                 dev->odr_mask = CTRL1_DF0 | CTRL1_DF1;
 888                 dev->scale = LIS3_SENSITIVITY_12B;
 889                 dev->regs = lis3_wai12_regs;
 890                 dev->regs_size = ARRAY_SIZE(lis3_wai12_regs);
 891                 break;
 892         case WAI_8B:
 893                 pr_info("8 bits sensor found\n");
 894                 dev->read_data = lis3lv02d_read_8;
 895                 dev->mdps_max_val = 128;
 896                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
 897                 dev->odrs = lis3_8_rates;
 898                 dev->odr_mask = CTRL1_DR;
 899                 dev->scale = LIS3_SENSITIVITY_8B;
 900                 dev->regs = lis3_wai8_regs;
 901                 dev->regs_size = ARRAY_SIZE(lis3_wai8_regs);
 902                 break;
 903         case WAI_3DC:
 904                 pr_info("8 bits 3DC sensor found\n");
 905                 dev->read_data = lis3lv02d_read_8;
 906                 dev->mdps_max_val = 128;
 907                 dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
 908                 dev->odrs = lis3_3dc_rates;
 909                 dev->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
 910                 dev->scale = LIS3_SENSITIVITY_8B;
 911                 break;
 912         default:
 913                 pr_err("unknown sensor type 0x%X\n", dev->whoami);
 914                 return -EINVAL;
 915         }
 916
 917         dev->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
 918                                      sizeof(lis3_wai12_regs)), GFP_KERNEL);
 919
 920         if (dev->reg_cache == NULL) {
 921                 printk(KERN_ERR DRIVER_NAME "out of memory\n");
 922                 return -ENOMEM;
 923         }
 924
 925         mutex_init(&dev->mutex);
 926         atomic_set(&dev->wake_thread, 0);
 927
 928         lis3lv02d_add_fs(dev);
 929         lis3lv02d_poweron(dev);
 930
 931         if (dev->pm_dev) {
 932                 pm_runtime_set_active(dev->pm_dev);
 933                 pm_runtime_enable(dev->pm_dev);
 934         }
 935
 936         if (lis3lv02d_joystick_enable())
 937                 pr_err("joystick initialization failed\n");
 938
 939         /* passing in platform specific data is purely optional and only
 940          * used by the SPI transport layer at the moment */
 941         if (dev->pdata) {
 942                 struct lis3lv02d_platform_data *p = dev->pdata;
 943
 944                 if (dev->whoami == WAI_8B)
 945                         lis3lv02d_8b_configure(dev, p);
 946
 947                 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
 948
 949                 dev->irq_cfg = p->irq_cfg;
 950                 if (p->irq_cfg)
 951                         dev->write(dev, CTRL_REG3, p->irq_cfg);
 952
 953                 if (p->default_rate)
 954                         lis3lv02d_set_odr(p->default_rate);
 955         }
 956
 957         /* bail if we did not get an IRQ from the bus layer */
 958         if (!dev->irq) {
 959                 pr_debug("No IRQ. Disabling /dev/freefall\n");
 960                 goto out;
 961         }
 962
 963         /*
 964          * The sensor can generate interrupts for free-fall and direction
 965          * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
 966          * the things simple and _fast_ we activate it only for free-fall, so
 967          * no need to read register (very slow with ACPI). For the same reason,
 968          * we forbid shared interrupts.
 969          *
 970          * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
 971          * io-apic is not configurable (and generates a warning) but I keep it
 972          * in case of support for other hardware.
 973          */
 974         if (dev->pdata && dev->whoami == WAI_8B)
 975                 thread_fn = lis302dl_interrupt_thread1_8b;
 976         else
 977                 thread_fn = NULL;
 978
 979         err = request_threaded_irq(dev->irq, lis302dl_interrupt,
 980                                 thread_fn,
 981                                 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
 982                                 irq_flags,
 983                                 DRIVER_NAME, &lis3_dev);
 984
 985         if (err < 0) {
 986                 pr_err("Cannot get IRQ\n");
 987                 goto out;
 988         }
 989
 990         if (misc_register(&lis3lv02d_misc_device))
 991                 pr_err("misc_register failed\n");
 992 out:
 993         return 0;
 994 }
 995 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
 996
 997 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
 998 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
 999 MODULE_LICENSE("GPL");