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