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/slab.h>
  35 #include <linux/freezer.h>
  36 #include <linux/uaccess.h>
  37 #include <linux/miscdevice.h>
  38 #include <linux/pm_runtime.h>
  39 #include <asm/atomic.h>
  40 #include "lis3lv02d.h"
  41
  42 #define DRIVER_NAME     "lis3lv02d"
  43
  44 /* joystick device poll interval in milliseconds */
  45 #define MDPS_POLL_INTERVAL 50
  46 #define MDPS_POLL_MIN      0
  47 #define MDPS_POLL_MAX      2000
  48
  49 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
  50
  51 #define SELFTEST_OK            0
  52 #define SELFTEST_FAIL          -1
  53 #define SELFTEST_IRQ           -2
  54
  55 #define IRQ_LINE0              0
  56 #define IRQ_LINE1              1
  57
  58 /*
  59  * The sensor can also generate interrupts (DRDY) but it's pretty pointless
  60  * because they are generated even if the data do not change. So it's better
  61  * to keep the interrupt for the free-fall event. The values are updated at
  62  * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
  63  * some low processor, we poll the sensor only at 20Hz... enough for the
  64  * joystick.
  65  */
  66
  67 #define LIS3_PWRON_DELAY_WAI_12B        (5000)
  68 #define LIS3_PWRON_DELAY_WAI_8B         (3000)
  69
  70 /*
  71  * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
  72  * LIS302D spec says: 18 mG / digit
  73  * LIS3_ACCURACY is used to increase accuracy of the intermediate
  74  * calculation results.
  75  */
  76 #define LIS3_ACCURACY                   1024
  77 /* Sensitivity values for -2G +2G scale */
  78 #define LIS3_SENSITIVITY_12B            ((LIS3_ACCURACY * 1000) / 1024)
  79 #define LIS3_SENSITIVITY_8B             (18 * LIS3_ACCURACY)
  80
  81 #define LIS3_DEFAULT_FUZZ_12B           3
  82 #define LIS3_DEFAULT_FLAT_12B           3
  83 #define LIS3_DEFAULT_FUZZ_8B            1
  84 #define LIS3_DEFAULT_FLAT_8B            1
  85
  86 struct lis3lv02d lis3_dev = {
  87         .misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
  88 };
  89
  90 EXPORT_SYMBOL_GPL(lis3_dev);
  91
  92 /* just like param_set_int() but does sanity-check so that it won't point
  93  * over the axis array size
  94  */
  95 static int param_set_axis(const char *val, const struct kernel_param *kp)
  96 {
  97         int ret = param_set_int(val, kp);
  98         if (!ret) {
  99                 int val = *(int *)kp->arg;
 100                 if (val < 0)
 101                         val = -val;
 102                 if (!val || val > 3)
 103                         return -EINVAL;
 104         }
 105         return ret;
 106 }
 107
 108 static struct kernel_param_ops param_ops_axis = {
 109         .set = param_set_axis,
 110         .get = param_get_int,
 111 };
 112
 113 module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
 114 MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");
 115
 116 static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
 117 {
 118         s8 lo;
 119         if (lis3->read(lis3, reg, &lo) < 0)
 120                 return 0;
 121
 122         return lo;
 123 }
 124
 125 static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
 126 {
 127         u8 lo, hi;
 128
 129         lis3->read(lis3, reg - 1, &lo);
 130         lis3->read(lis3, reg, &hi);
 131         /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
 132         return (s16)((hi << 8) | lo);
 133 }
 134
 135 /**
 136  * lis3lv02d_get_axis - For the given axis, give the value converted
 137  * @axis:      1,2,3 - can also be negative
 138  * @hw_values: raw values returned by the hardware
 139  *
 140  * Returns the converted value.
 141  */
 142 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
 143 {
 144         if (axis > 0)
 145                 return hw_values[axis - 1];
 146         else
 147                 return -hw_values[-axis - 1];
 148 }
 149
 150 /**
 151  * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 152  * @lis3: pointer to the device struct
 153  * @x:    where to store the X axis value
 154  * @y:    where to store the Y axis value
 155  * @z:    where to store the Z axis value
 156  *
 157  * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 158  */
 159 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 160 {
 161         int position[3];
 162         int i;
 163
 164         if (lis3->blkread) {
 165                 if (lis3_dev.whoami == WAI_12B) {
 166                         u16 data[3];
 167                         lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
 168                         for (i = 0; i < 3; i++)
 169                                 position[i] = (s16)le16_to_cpu(data[i]);
 170                 } else {
 171                         u8 data[5];
 172                         /* Data: x, dummy, y, dummy, z */
 173                         lis3->blkread(lis3, OUTX, 5, data);
 174                         for (i = 0; i < 3; i++)
 175                                 position[i] = (s8)data[i * 2];
 176                 }
 177         } else {
 178                 position[0] = lis3->read_data(lis3, OUTX);
 179                 position[1] = lis3->read_data(lis3, OUTY);
 180                 position[2] = lis3->read_data(lis3, OUTZ);
 181         }
 182
 183         for (i = 0; i < 3; i++)
 184                 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
 185
 186         *x = lis3lv02d_get_axis(lis3->ac.x, position);
 187         *y = lis3lv02d_get_axis(lis3->ac.y, position);
 188         *z = lis3lv02d_get_axis(lis3->ac.z, position);
 189 }
 190
 191 /* conversion btw sampling rate and the register values */
 192 static int lis3_12_rates[4] = {40, 160, 640, 2560};
 193 static int lis3_8_rates[2] = {100, 400};
 194 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
 195
 196 /* ODR is Output Data Rate */
 197 static int lis3lv02d_get_odr(void)
 198 {
 199         u8 ctrl;
 200         int shift;
 201
 202         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 203         ctrl &= lis3_dev.odr_mask;
 204         shift = ffs(lis3_dev.odr_mask) - 1;
 205         return lis3_dev.odrs[(ctrl >> shift)];
 206 }
 207
 208 static int lis3lv02d_set_odr(int rate)
 209 {
 210         u8 ctrl;
 211         int i, len, shift;
 212
 213         if (!rate)
 214                 return -EINVAL;
 215
 216         lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
 217         ctrl &= ~lis3_dev.odr_mask;
 218         len = 1 << hweight_long(lis3_dev.odr_mask); /* # of possible values */
 219         shift = ffs(lis3_dev.odr_mask) - 1;
 220
 221         for (i = 0; i < len; i++)
 222                 if (lis3_dev.odrs[i] == rate) {
 223                         lis3_dev.write(&lis3_dev, CTRL_REG1,
 224                                         ctrl | (i << shift));
 225                         return 0;
 226                 }
 227         return -EINVAL;
 228 }
 229
 230 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
 231 {
 232         u8 ctlreg, reg;
 233         s16 x, y, z;
 234         u8 selftest;
 235         int ret;
 236         u8 ctrl_reg_data;
 237         unsigned char irq_cfg;
 238
 239         mutex_lock(&lis3->mutex);
 240
 241         irq_cfg = lis3->irq_cfg;
 242         if (lis3_dev.whoami == WAI_8B) {
 243                 lis3->data_ready_count[IRQ_LINE0] = 0;
 244                 lis3->data_ready_count[IRQ_LINE1] = 0;
 245
 246                 /* Change interrupt cfg to data ready for selftest */
 247                 atomic_inc(&lis3_dev.wake_thread);
 248                 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
 249                 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
 250                 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
 251                                 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
 252                                 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
 253         }
 254
 255         if (lis3_dev.whoami == WAI_3DC) {
 256                 ctlreg = CTRL_REG4;
 257                 selftest = CTRL4_ST0;
 258         } else {
 259                 ctlreg = CTRL_REG1;
 260                 if (lis3_dev.whoami == WAI_12B)
 261                         selftest = CTRL1_ST;
 262                 else
 263                         selftest = CTRL1_STP;
 264         }
 265
 266         lis3->read(lis3, ctlreg, &reg);
 267         lis3->write(lis3, ctlreg, (reg | selftest));
 268         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 269
 270         /* Read directly to avoid axis remap */
 271         x = lis3->read_data(lis3, OUTX);
 272         y = lis3->read_data(lis3, OUTY);
 273         z = lis3->read_data(lis3, OUTZ);
 274
 275         /* back to normal settings */
 276         lis3->write(lis3, ctlreg, reg);
 277         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 278
 279         results[0] = x - lis3->read_data(lis3, OUTX);
 280         results[1] = y - lis3->read_data(lis3, OUTY);
 281         results[2] = z - lis3->read_data(lis3, OUTZ);
 282
 283         ret = 0;
 284
 285         if (lis3_dev.whoami == WAI_8B) {
 286                 /* Restore original interrupt configuration */
 287                 atomic_dec(&lis3_dev.wake_thread);
 288                 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
 289                 lis3->irq_cfg = irq_cfg;
 290
 291                 if ((irq_cfg & LIS3_IRQ1_MASK) &&
 292                         lis3->data_ready_count[IRQ_LINE0] < 2) {
 293                         ret = SELFTEST_IRQ;
 294                         goto fail;
 295                 }
 296
 297                 if ((irq_cfg & LIS3_IRQ2_MASK) &&
 298                         lis3->data_ready_count[IRQ_LINE1] < 2) {
 299                         ret = SELFTEST_IRQ;
 300                         goto fail;
 301                 }
 302         }
 303
 304         if (lis3->pdata) {
 305                 int i;
 306                 for (i = 0; i < 3; i++) {
 307                         /* Check against selftest acceptance limits */
 308                         if ((results[i] < lis3->pdata->st_min_limits[i]) ||
 309                             (results[i] > lis3->pdata->st_max_limits[i])) {
 310                                 ret = SELFTEST_FAIL;
 311                                 goto fail;
 312                         }
 313                 }
 314         }
 315
 316         /* test passed */
 317 fail:
 318         mutex_unlock(&lis3->mutex);
 319         return ret;
 320 }
 321
 322 /*
 323  * Order of registers in the list affects to order of the restore process.
 324  * Perhaps it is a good idea to set interrupt enable register as a last one
 325  * after all other configurations
 326  */
 327 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
 328                                FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
 329                                CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
 330                                CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
 331                                CTRL_REG1, CTRL_REG2, CTRL_REG3};
 332
 333 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
 334                                FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
 335                                DD_THSE_L, DD_THSE_H,
 336                                CTRL_REG1, CTRL_REG3, CTRL_REG2};
 337
 338 static inline void lis3_context_save(struct lis3lv02d *lis3)
 339 {
 340         int i;
 341         for (i = 0; i < lis3->regs_size; i++)
 342                 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
 343         lis3->regs_stored = true;
 344 }
 345
 346 static inline void lis3_context_restore(struct lis3lv02d *lis3)
 347 {
 348         int i;
 349         if (lis3->regs_stored)
 350                 for (i = 0; i < lis3->regs_size; i++)
 351                         lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
 352 }
 353
 354 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
 355 {
 356         if (lis3->reg_ctrl)
 357                 lis3_context_save(lis3);
 358         /* disable X,Y,Z axis and power down */
 359         lis3->write(lis3, CTRL_REG1, 0x00);
 360         if (lis3->reg_ctrl)
 361                 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
 362 }
 363 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
 364
 365 void lis3lv02d_poweron(struct lis3lv02d *lis3)
 366 {
 367         u8 reg;
 368
 369         lis3->init(lis3);
 370
 371         /*
 372          * Common configuration
 373          * BDU: (12 bits sensors only) LSB and MSB values are not updated until
 374          *      both have been read. So the value read will always be correct.
 375          * Set BOOT bit to refresh factory tuning values.
 376          */
 377         lis3->read(lis3, CTRL_REG2, &reg);
 378         if (lis3->whoami ==  WAI_12B)
 379                 reg |= CTRL2_BDU | CTRL2_BOOT;
 380         else
 381                 reg |= CTRL2_BOOT_8B;
 382         lis3->write(lis3, CTRL_REG2, reg);
 383
 384         /* LIS3 power on delay is quite long */
 385         msleep(lis3->pwron_delay / lis3lv02d_get_odr());
 386
 387         if (lis3->reg_ctrl)
 388                 lis3_context_restore(lis3);
 389 }
 390 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
 391
 392
 393 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
 394 {
 395         int x, y, z;
 396
 397         mutex_lock(&lis3_dev.mutex);
 398         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 399         input_report_abs(pidev->input, ABS_X, x);
 400         input_report_abs(pidev->input, ABS_Y, y);
 401         input_report_abs(pidev->input, ABS_Z, z);
 402         input_sync(pidev->input);
 403         mutex_unlock(&lis3_dev.mutex);
 404 }
 405
 406 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
 407 {
 408         if (lis3_dev.pm_dev)
 409                 pm_runtime_get_sync(lis3_dev.pm_dev);
 410
 411         if (lis3_dev.pdata && lis3_dev.whoami == WAI_8B && lis3_dev.idev)
 412                 atomic_set(&lis3_dev.wake_thread, 1);
 413         /*
 414          * Update coordinates for the case where poll interval is 0 and
 415          * the chip in running purely under interrupt control
 416          */
 417         lis3lv02d_joystick_poll(pidev);
 418 }
 419
 420 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
 421 {
 422         atomic_set(&lis3_dev.wake_thread, 0);
 423         if (lis3_dev.pm_dev)
 424                 pm_runtime_put(lis3_dev.pm_dev);
 425 }
 426
 427 static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
 428 {
 429         if (!test_bit(0, &lis3_dev.misc_opened))
 430                 goto out;
 431
 432         /*
 433          * Be careful: on some HP laptops the bios force DD when on battery and
 434          * the lid is closed. This leads to interrupts as soon as a little move
 435          * is done.
 436          */
 437         atomic_inc(&lis3_dev.count);
 438
 439         wake_up_interruptible(&lis3_dev.misc_wait);
 440         kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
 441 out:
 442         if (atomic_read(&lis3_dev.wake_thread))
 443                 return IRQ_WAKE_THREAD;
 444         return IRQ_HANDLED;
 445 }
 446
 447 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
 448 {
 449         struct input_dev *dev = lis3->idev->input;
 450         u8 click_src;
 451
 452         mutex_lock(&lis3->mutex);
 453         lis3->read(lis3, CLICK_SRC, &click_src);
 454
 455         if (click_src & CLICK_SINGLE_X) {
 456                 input_report_key(dev, lis3->mapped_btns[0], 1);
 457                 input_report_key(dev, lis3->mapped_btns[0], 0);
 458         }
 459
 460         if (click_src & CLICK_SINGLE_Y) {
 461                 input_report_key(dev, lis3->mapped_btns[1], 1);
 462                 input_report_key(dev, lis3->mapped_btns[1], 0);
 463         }
 464
 465         if (click_src & CLICK_SINGLE_Z) {
 466                 input_report_key(dev, lis3->mapped_btns[2], 1);
 467                 input_report_key(dev, lis3->mapped_btns[2], 0);
 468         }
 469         input_sync(dev);
 470         mutex_unlock(&lis3->mutex);
 471 }
 472
 473 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
 474 {
 475         int dummy;
 476
 477         /* Dummy read to ack interrupt */
 478         lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
 479         lis3->data_ready_count[index]++;
 480 }
 481
 482 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
 483 {
 484         struct lis3lv02d *lis3 = data;
 485         u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
 486
 487         if (irq_cfg == LIS3_IRQ1_CLICK)
 488                 lis302dl_interrupt_handle_click(lis3);
 489         else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
 490                 lis302dl_data_ready(lis3, IRQ_LINE0);
 491         else
 492                 lis3lv02d_joystick_poll(lis3->idev);
 493
 494         return IRQ_HANDLED;
 495 }
 496
 497 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
 498 {
 499         struct lis3lv02d *lis3 = data;
 500         u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
 501
 502         if (irq_cfg == LIS3_IRQ2_CLICK)
 503                 lis302dl_interrupt_handle_click(lis3);
 504         else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
 505                 lis302dl_data_ready(lis3, IRQ_LINE1);
 506         else
 507                 lis3lv02d_joystick_poll(lis3->idev);
 508
 509         return IRQ_HANDLED;
 510 }
 511
 512 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
 513 {
 514         if (test_and_set_bit(0, &lis3_dev.misc_opened))
 515                 return -EBUSY; /* already open */
 516
 517         if (lis3_dev.pm_dev)
 518                 pm_runtime_get_sync(lis3_dev.pm_dev);
 519
 520         atomic_set(&lis3_dev.count, 0);
 521         return 0;
 522 }
 523
 524 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
 525 {
 526         fasync_helper(-1, file, 0, &lis3_dev.async_queue);
 527         clear_bit(0, &lis3_dev.misc_opened); /* release the device */
 528         if (lis3_dev.pm_dev)
 529                 pm_runtime_put(lis3_dev.pm_dev);
 530         return 0;
 531 }
 532
 533 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
 534                                 size_t count, loff_t *pos)
 535 {
 536         DECLARE_WAITQUEUE(wait, current);
 537         u32 data;
 538         unsigned char byte_data;
 539         ssize_t retval = 1;
 540
 541         if (count < 1)
 542                 return -EINVAL;
 543
 544         add_wait_queue(&lis3_dev.misc_wait, &wait);
 545         while (true) {
 546                 set_current_state(TASK_INTERRUPTIBLE);
 547                 data = atomic_xchg(&lis3_dev.count, 0);
 548                 if (data)
 549                         break;
 550
 551                 if (file->f_flags & O_NONBLOCK) {
 552                         retval = -EAGAIN;
 553                         goto out;
 554                 }
 555
 556                 if (signal_pending(current)) {
 557                         retval = -ERESTARTSYS;
 558                         goto out;
 559                 }
 560
 561                 schedule();
 562         }
 563
 564         if (data < 255)
 565                 byte_data = data;
 566         else
 567                 byte_data = 255;
 568
 569         /* make sure we are not going into copy_to_user() with
 570          * TASK_INTERRUPTIBLE state */
 571         set_current_state(TASK_RUNNING);
 572         if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
 573                 retval = -EFAULT;
 574
 575 out:
 576         __set_current_state(TASK_RUNNING);
 577         remove_wait_queue(&lis3_dev.misc_wait, &wait);
 578
 579         return retval;
 580 }
 581
 582 static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
 583 {
 584         poll_wait(file, &lis3_dev.misc_wait, wait);
 585         if (atomic_read(&lis3_dev.count))
 586                 return POLLIN | POLLRDNORM;
 587         return 0;
 588 }
 589
 590 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
 591 {
 592         return fasync_helper(fd, file, on, &lis3_dev.async_queue);
 593 }
 594
 595 static const struct file_operations lis3lv02d_misc_fops = {
 596         .owner   = THIS_MODULE,
 597         .llseek  = no_llseek,
 598         .read    = lis3lv02d_misc_read,
 599         .open    = lis3lv02d_misc_open,
 600         .release = lis3lv02d_misc_release,
 601         .poll    = lis3lv02d_misc_poll,
 602         .fasync  = lis3lv02d_misc_fasync,
 603 };
 604
 605 static struct miscdevice lis3lv02d_misc_device = {
 606         .minor   = MISC_DYNAMIC_MINOR,
 607         .name    = "freefall",
 608         .fops    = &lis3lv02d_misc_fops,
 609 };
 610
 611 int lis3lv02d_joystick_enable(void)
 612 {
 613         struct input_dev *input_dev;
 614         int err;
 615         int max_val, fuzz, flat;
 616         int btns[] = {BTN_X, BTN_Y, BTN_Z};
 617
 618         if (lis3_dev.idev)
 619                 return -EINVAL;
 620
 621         lis3_dev.idev = input_allocate_polled_device();
 622         if (!lis3_dev.idev)
 623                 return -ENOMEM;
 624
 625         lis3_dev.idev->poll = lis3lv02d_joystick_poll;
 626         lis3_dev.idev->open = lis3lv02d_joystick_open;
 627         lis3_dev.idev->close = lis3lv02d_joystick_close;
 628         lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
 629         lis3_dev.idev->poll_interval_min = MDPS_POLL_MIN;
 630         lis3_dev.idev->poll_interval_max = MDPS_POLL_MAX;
 631         input_dev = lis3_dev.idev->input;
 632
 633         input_dev->name       = "ST LIS3LV02DL Accelerometer";
 634         input_dev->phys       = DRIVER_NAME "/input0";
 635         input_dev->id.bustype = BUS_HOST;
 636         input_dev->id.vendor  = 0;
 637         input_dev->dev.parent = &lis3_dev.pdev->dev;
 638
 639         set_bit(EV_ABS, input_dev->evbit);
 640         max_val = (lis3_dev.mdps_max_val * lis3_dev.scale) / LIS3_ACCURACY;
 641         if (lis3_dev.whoami == WAI_12B) {
 642                 fuzz = LIS3_DEFAULT_FUZZ_12B;
 643                 flat = LIS3_DEFAULT_FLAT_12B;
 644         } else {
 645                 fuzz = LIS3_DEFAULT_FUZZ_8B;
 646                 flat = LIS3_DEFAULT_FLAT_8B;
 647         }
 648         fuzz = (fuzz * lis3_dev.scale) / LIS3_ACCURACY;
 649         flat = (flat * lis3_dev.scale) / LIS3_ACCURACY;
 650
 651         input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
 652         input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
 653         input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
 654
 655         lis3_dev.mapped_btns[0] = lis3lv02d_get_axis(abs(lis3_dev.ac.x), btns);
 656         lis3_dev.mapped_btns[1] = lis3lv02d_get_axis(abs(lis3_dev.ac.y), btns);
 657         lis3_dev.mapped_btns[2] = lis3lv02d_get_axis(abs(lis3_dev.ac.z), btns);
 658
 659         err = input_register_polled_device(lis3_dev.idev);
 660         if (err) {
 661                 input_free_polled_device(lis3_dev.idev);
 662                 lis3_dev.idev = NULL;
 663         }
 664
 665         return err;
 666 }
 667 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
 668
 669 void lis3lv02d_joystick_disable(void)
 670 {
 671         if (lis3_dev.irq)
 672                 free_irq(lis3_dev.irq, &lis3_dev);
 673         if (lis3_dev.pdata && lis3_dev.pdata->irq2)
 674                 free_irq(lis3_dev.pdata->irq2, &lis3_dev);
 675
 676         if (!lis3_dev.idev)
 677                 return;
 678
 679         if (lis3_dev.irq)
 680                 misc_deregister(&lis3lv02d_misc_device);
 681         input_unregister_polled_device(lis3_dev.idev);
 682         input_free_polled_device(lis3_dev.idev);
 683         lis3_dev.idev = NULL;
 684 }
 685 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
 686
 687 /* Sysfs stuff */
 688 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
 689 {
 690         /*
 691          * SYSFS functions are fast visitors so put-call
 692          * immediately after the get-call. However, keep
 693          * chip running for a while and schedule delayed
 694          * suspend. This way periodic sysfs calls doesn't
 695          * suffer from relatively long power up time.
 696          */
 697
 698         if (lis3->pm_dev) {
 699                 pm_runtime_get_sync(lis3->pm_dev);
 700                 pm_runtime_put_noidle(lis3->pm_dev);
 701                 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
 702         }
 703 }
 704
 705 static ssize_t lis3lv02d_selftest_show(struct device *dev,
 706                                 struct device_attribute *attr, char *buf)
 707 {
 708         s16 values[3];
 709
 710         static const char ok[] = "OK";
 711         static const char fail[] = "FAIL";
 712         static const char irq[] = "FAIL_IRQ";
 713         const char *res;
 714
 715         lis3lv02d_sysfs_poweron(&lis3_dev);
 716         switch (lis3lv02d_selftest(&lis3_dev, values)) {
 717         case SELFTEST_FAIL:
 718                 res = fail;
 719                 break;
 720         case SELFTEST_IRQ:
 721                 res = irq;
 722                 break;
 723         case SELFTEST_OK:
 724         default:
 725                 res = ok;
 726                 break;
 727         }
 728         return sprintf(buf, "%s %d %d %d\n", res,
 729                 values[0], values[1], values[2]);
 730 }
 731
 732 static ssize_t lis3lv02d_position_show(struct device *dev,
 733                                 struct device_attribute *attr, char *buf)
 734 {
 735         int x, y, z;
 736
 737         lis3lv02d_sysfs_poweron(&lis3_dev);
 738         mutex_lock(&lis3_dev.mutex);
 739         lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
 740         mutex_unlock(&lis3_dev.mutex);
 741         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 742 }
 743
 744 static ssize_t lis3lv02d_rate_show(struct device *dev,
 745                         struct device_attribute *attr, char *buf)
 746 {
 747         lis3lv02d_sysfs_poweron(&lis3_dev);
 748         return sprintf(buf, "%d\n", lis3lv02d_get_odr());
 749 }
 750
 751 static ssize_t lis3lv02d_rate_set(struct device *dev,
 752                                 struct device_attribute *attr, const char *buf,
 753                                 size_t count)
 754 {
 755         unsigned long rate;
 756
 757         if (strict_strtoul(buf, 0, &rate))
 758                 return -EINVAL;
 759
 760         lis3lv02d_sysfs_poweron(&lis3_dev);
 761         if (lis3lv02d_set_odr(rate))
 762                 return -EINVAL;
 763
 764         return count;
 765 }
 766
 767 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
 768 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
 769 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
 770                                             lis3lv02d_rate_set);
 771
 772 static struct attribute *lis3lv02d_attributes[] = {
 773         &dev_attr_selftest.attr,
 774         &dev_attr_position.attr,
 775         &dev_attr_rate.attr,
 776         NULL
 777 };
 778
 779 static struct attribute_group lis3lv02d_attribute_group = {
 780         .attrs = lis3lv02d_attributes
 781 };
 782
 783
 784 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 785 {
 786         lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 787         if (IS_ERR(lis3->pdev))
 788                 return PTR_ERR(lis3->pdev);
 789
 790         return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 791 }
 792
 793 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
 794 {
 795         sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 796         platform_device_unregister(lis3->pdev);
 797         if (lis3->pm_dev) {
 798                 /* Barrier after the sysfs remove */
 799                 pm_runtime_barrier(lis3->pm_dev);
 800
 801                 /* SYSFS may have left chip running. Turn off if necessary */
 802                 if (!pm_runtime_suspended(lis3->pm_dev))
 803                         lis3lv02d_poweroff(&lis3_dev);
 804
 805                 pm_runtime_disable(lis3->pm_dev);
 806                 pm_runtime_set_suspended(lis3->pm_dev);
 807         }
 808         kfree(lis3->reg_cache);
 809         return 0;
 810 }
 811 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
 812
 813 static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
 814                                 struct lis3lv02d_platform_data *p)
 815 {
 816         int err;
 817         int ctrl2 = p->hipass_ctrl;
 818
 819         if (p->click_flags) {
 820                 dev->write(dev, CLICK_CFG, p->click_flags);
 821                 dev->write(dev, CLICK_TIMELIMIT, p->click_time_limit);
 822                 dev->write(dev, CLICK_LATENCY, p->click_latency);
 823                 dev->write(dev, CLICK_WINDOW, p->click_window);
 824                 dev->write(dev, CLICK_THSZ, p->click_thresh_z & 0xf);
 825                 dev->write(dev, CLICK_THSY_X,
 826                         (p->click_thresh_x & 0xf) |
 827                         (p->click_thresh_y << 4));
 828
 829                 if (dev->idev) {
 830                         struct input_dev *input_dev = lis3_dev.idev->input;
 831                         input_set_capability(input_dev, EV_KEY, BTN_X);
 832                         input_set_capability(input_dev, EV_KEY, BTN_Y);
 833                         input_set_capability(input_dev, EV_KEY, BTN_Z);
 834                 }
 835         }
 836
 837         if (p->wakeup_flags) {
 838                 dev->write(dev, FF_WU_CFG_1, p->wakeup_flags);
 839                 dev->write(dev, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
 840                 /* pdata value + 1 to keep this backward compatible*/
 841                 dev->write(dev, FF_WU_DURATION_1, p->duration1 + 1);
 842                 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
 843         }
 844
 845         if (p->wakeup_flags2) {
 846                 dev->write(dev, FF_WU_CFG_2, p->wakeup_flags2);
 847                 dev->write(dev, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
 848                 /* pdata value + 1 to keep this backward compatible*/
 849                 dev->write(dev, FF_WU_DURATION_2, p->duration2 + 1);
 850                 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
 851         }
 852         /* Configure hipass filters */
 853         dev->write(dev, CTRL_REG2, ctrl2);
 854
 855         if (p->irq2) {
 856                 err = request_threaded_irq(p->irq2,
 857                                         NULL,
 858                                         lis302dl_interrupt_thread2_8b,
 859                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT |
 860                                         (p->irq_flags2 & IRQF_TRIGGER_MASK),
 861                                         DRIVER_NAME, &lis3_dev);
 862                 if (err < 0)
 863                         printk(KERN_ERR DRIVER_NAME
 864                                 "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                 printk(KERN_INFO DRIVER_NAME ": 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                 printk(KERN_INFO DRIVER_NAME ": 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                 printk(KERN_INFO DRIVER_NAME ": 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                 printk(KERN_ERR DRIVER_NAME
 914                         ": 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                 printk(KERN_ERR DRIVER_NAME ": 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                 printk(KERN_ERR DRIVER_NAME
 961                         ": No IRQ. Disabling /dev/freefall\n");
 962                 goto out;
 963         }
 964
 965         /*
 966          * The sensor can generate interrupts for free-fall and direction
 967          * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
 968          * the things simple and _fast_ we activate it only for free-fall, so
 969          * no need to read register (very slow with ACPI). For the same reason,
 970          * we forbid shared interrupts.
 971          *
 972          * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
 973          * io-apic is not configurable (and generates a warning) but I keep it
 974          * in case of support for other hardware.
 975          */
 976         if (dev->pdata && dev->whoami == WAI_8B)
 977                 thread_fn = lis302dl_interrupt_thread1_8b;
 978         else
 979                 thread_fn = NULL;
 980
 981         err = request_threaded_irq(dev->irq, lis302dl_interrupt,
 982                                 thread_fn,
 983                                 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
 984                                 irq_flags,
 985                                 DRIVER_NAME, &lis3_dev);
 986
 987         if (err < 0) {
 988                 printk(KERN_ERR DRIVER_NAME "Cannot get IRQ\n");
 989                 goto out;
 990         }
 991
 992         if (misc_register(&lis3lv02d_misc_device))
 993                 printk(KERN_ERR DRIVER_NAME ": misc_register failed\n");
 994 out:
 995         return 0;
 996 }
 997 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
 998
 999 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1000 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1001 MODULE_LICENSE("GPL");