drivers/misc/lis3lv02d/lis3lv02d.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
param_set_axis
lis3lv02d_read_8
lis3lv02d_read_12
lis331dlh_read_data
lis3lv02d_get_axis
lis3lv02d_get_xyz
lis3lv02d_get_odr
lis3lv02d_get_pwron_wait
lis3lv02d_set_odr
lis3lv02d_selftest
lis3_context_save
lis3_context_restore
lis3lv02d_poweroff
lis3lv02d_poweron
lis3lv02d_joystick_poll
lis3lv02d_joystick_open
lis3lv02d_joystick_close
lis302dl_interrupt
lis302dl_interrupt_handle_click
lis302dl_data_ready
lis302dl_interrupt_thread1_8b
lis302dl_interrupt_thread2_8b
lis3lv02d_misc_open
lis3lv02d_misc_release
lis3lv02d_misc_read
lis3lv02d_misc_poll
lis3lv02d_misc_fasync
lis3lv02d_joystick_enable
lis3lv02d_joystick_disable
lis3lv02d_sysfs_poweron
lis3lv02d_selftest_show
lis3lv02d_position_show
lis3lv02d_rate_show
lis3lv02d_rate_set
lis3lv02d_add_fs
lis3lv02d_remove_fs
lis3lv02d_8b_configure
lis3lv02d_init_dt
lis3lv02d_init_dt
lis3lv02d_init_device
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
   4  *
   5  *  Copyright (C) 2007-2008 Yan Burman
   6  *  Copyright (C) 2008 Eric Piel
   7  *  Copyright (C) 2008-2009 Pavel Machek
   8  */
   9 
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11 
  12 #include <linux/kernel.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/dmi.h>
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/input-polldev.h>
  20 #include <linux/delay.h>
  21 #include <linux/wait.h>
  22 #include <linux/poll.h>
  23 #include <linux/slab.h>
  24 #include <linux/freezer.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/atomic.h>
  29 #include <linux/of_device.h>
  30 #include "lis3lv02d.h"
  31 
  32 #define DRIVER_NAME     "lis3lv02d"
  33 
  34 /* joystick device poll interval in milliseconds */
  35 #define MDPS_POLL_INTERVAL 50
  36 #define MDPS_POLL_MIN      0
  37 #define MDPS_POLL_MAX      2000
  38 
  39 #define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */
  40 
  41 #define SELFTEST_OK            0
  42 #define SELFTEST_FAIL          -1
  43 #define SELFTEST_IRQ           -2
  44 
  45 #define IRQ_LINE0              0
  46 #define IRQ_LINE1              1
  47 
  48 /*
  49  * The sensor can also generate interrupts (DRDY) but it's pretty pointless
  50  * because they are generated even if the data do not change. So it's better
  51  * to keep the interrupt for the free-fall event. The values are updated at
  52  * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
  53  * some low processor, we poll the sensor only at 20Hz... enough for the
  54  * joystick.
  55  */
  56 
  57 #define LIS3_PWRON_DELAY_WAI_12B        (5000)
  58 #define LIS3_PWRON_DELAY_WAI_8B         (3000)
  59 
  60 /*
  61  * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
  62  * LIS302D spec says: 18 mG / digit
  63  * LIS3_ACCURACY is used to increase accuracy of the intermediate
  64  * calculation results.
  65  */
  66 #define LIS3_ACCURACY                   1024
  67 /* Sensitivity values for -2G +2G scale */
  68 #define LIS3_SENSITIVITY_12B            ((LIS3_ACCURACY * 1000) / 1024)
  69 #define LIS3_SENSITIVITY_8B             (18 * LIS3_ACCURACY)
  70 
  71 /*
  72  * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG.
  73  * Below macros defines sensitivity values for +/-2G. Dataout bits for
  74  * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit
  75  * data from 16bit value. Currently this driver supports only 2G range.
  76  */
  77 #define LIS3DLH_SENSITIVITY_2G          ((LIS3_ACCURACY * 1000) / 1024)
  78 #define SHIFT_ADJ_2G                    4
  79 
  80 #define LIS3_DEFAULT_FUZZ_12B           3
  81 #define LIS3_DEFAULT_FLAT_12B           3
  82 #define LIS3_DEFAULT_FUZZ_8B            1
  83 #define LIS3_DEFAULT_FLAT_8B            1
  84 
  85 struct lis3lv02d lis3_dev = {
  86         .misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
  87 };
  88 EXPORT_SYMBOL_GPL(lis3_dev);
  89 
  90 /* just like param_set_int() but does sanity-check so that it won't point
  91  * over the axis array size
  92  */
  93 static int param_set_axis(const char *val, const struct kernel_param *kp)
  94 {
  95         int ret = param_set_int(val, kp);
  96         if (!ret) {
  97                 int val = *(int *)kp->arg;
  98                 if (val < 0)
  99                         val = -val;
 100                 if (!val || val > 3)
 101                         return -EINVAL;
 102         }
 103         return ret;
 104 }
 105 
 106 static const struct kernel_param_ops param_ops_axis = {
 107         .set = param_set_axis,
 108         .get = param_get_int,
 109 };
 110 
 111 #define param_check_axis(name, p) param_check_int(name, p)
 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 /* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */
 136 static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg)
 137 {
 138         u8 lo, hi;
 139         int v;
 140 
 141         lis3->read(lis3, reg - 1, &lo);
 142         lis3->read(lis3, reg, &hi);
 143         v = (int) ((hi << 8) | lo);
 144 
 145         return (s16) v >> lis3->shift_adj;
 146 }
 147 
 148 /**
 149  * lis3lv02d_get_axis - For the given axis, give the value converted
 150  * @axis:      1,2,3 - can also be negative
 151  * @hw_values: raw values returned by the hardware
 152  *
 153  * Returns the converted value.
 154  */
 155 static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
 156 {
 157         if (axis > 0)
 158                 return hw_values[axis - 1];
 159         else
 160                 return -hw_values[-axis - 1];
 161 }
 162 
 163 /**
 164  * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 165  * @lis3: pointer to the device struct
 166  * @x:    where to store the X axis value
 167  * @y:    where to store the Y axis value
 168  * @z:    where to store the Z axis value
 169  *
 170  * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 171  */
 172 static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
 173 {
 174         int position[3];
 175         int i;
 176 
 177         if (lis3->blkread) {
 178                 if (lis3->whoami == WAI_12B) {
 179                         u16 data[3];
 180                         lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
 181                         for (i = 0; i < 3; i++)
 182                                 position[i] = (s16)le16_to_cpu(data[i]);
 183                 } else {
 184                         u8 data[5];
 185                         /* Data: x, dummy, y, dummy, z */
 186                         lis3->blkread(lis3, OUTX, 5, data);
 187                         for (i = 0; i < 3; i++)
 188                                 position[i] = (s8)data[i * 2];
 189                 }
 190         } else {
 191                 position[0] = lis3->read_data(lis3, OUTX);
 192                 position[1] = lis3->read_data(lis3, OUTY);
 193                 position[2] = lis3->read_data(lis3, OUTZ);
 194         }
 195 
 196         for (i = 0; i < 3; i++)
 197                 position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;
 198 
 199         *x = lis3lv02d_get_axis(lis3->ac.x, position);
 200         *y = lis3lv02d_get_axis(lis3->ac.y, position);
 201         *z = lis3lv02d_get_axis(lis3->ac.z, position);
 202 }
 203 
 204 /* conversion btw sampling rate and the register values */
 205 static int lis3_12_rates[4] = {40, 160, 640, 2560};
 206 static int lis3_8_rates[2] = {100, 400};
 207 static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
 208 static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};
 209 
 210 /* ODR is Output Data Rate */
 211 static int lis3lv02d_get_odr(struct lis3lv02d *lis3)
 212 {
 213         u8 ctrl;
 214         int shift;
 215 
 216         lis3->read(lis3, CTRL_REG1, &ctrl);
 217         ctrl &= lis3->odr_mask;
 218         shift = ffs(lis3->odr_mask) - 1;
 219         return lis3->odrs[(ctrl >> shift)];
 220 }
 221 
 222 static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
 223 {
 224         int div = lis3lv02d_get_odr(lis3);
 225 
 226         if (WARN_ONCE(div == 0, "device returned spurious data"))
 227                 return -ENXIO;
 228 
 229         /* LIS3 power on delay is quite long */
 230         msleep(lis3->pwron_delay / div);
 231         return 0;
 232 }
 233 
 234 static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
 235 {
 236         u8 ctrl;
 237         int i, len, shift;
 238 
 239         if (!rate)
 240                 return -EINVAL;
 241 
 242         lis3->read(lis3, CTRL_REG1, &ctrl);
 243         ctrl &= ~lis3->odr_mask;
 244         len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
 245         shift = ffs(lis3->odr_mask) - 1;
 246 
 247         for (i = 0; i < len; i++)
 248                 if (lis3->odrs[i] == rate) {
 249                         lis3->write(lis3, CTRL_REG1,
 250                                         ctrl | (i << shift));
 251                         return 0;
 252                 }
 253         return -EINVAL;
 254 }
 255 
 256 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
 257 {
 258         u8 ctlreg, reg;
 259         s16 x, y, z;
 260         u8 selftest;
 261         int ret;
 262         u8 ctrl_reg_data;
 263         unsigned char irq_cfg;
 264 
 265         mutex_lock(&lis3->mutex);
 266 
 267         irq_cfg = lis3->irq_cfg;
 268         if (lis3->whoami == WAI_8B) {
 269                 lis3->data_ready_count[IRQ_LINE0] = 0;
 270                 lis3->data_ready_count[IRQ_LINE1] = 0;
 271 
 272                 /* Change interrupt cfg to data ready for selftest */
 273                 atomic_inc(&lis3->wake_thread);
 274                 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
 275                 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
 276                 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
 277                                 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
 278                                 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
 279         }
 280 
 281         if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
 282                 ctlreg = CTRL_REG4;
 283                 selftest = CTRL4_ST0;
 284         } else {
 285                 ctlreg = CTRL_REG1;
 286                 if (lis3->whoami == WAI_12B)
 287                         selftest = CTRL1_ST;
 288                 else
 289                         selftest = CTRL1_STP;
 290         }
 291 
 292         lis3->read(lis3, ctlreg, &reg);
 293         lis3->write(lis3, ctlreg, (reg | selftest));
 294         ret = lis3lv02d_get_pwron_wait(lis3);
 295         if (ret)
 296                 goto fail;
 297 
 298         /* Read directly to avoid axis remap */
 299         x = lis3->read_data(lis3, OUTX);
 300         y = lis3->read_data(lis3, OUTY);
 301         z = lis3->read_data(lis3, OUTZ);
 302 
 303         /* back to normal settings */
 304         lis3->write(lis3, ctlreg, reg);
 305         ret = lis3lv02d_get_pwron_wait(lis3);
 306         if (ret)
 307                 goto fail;
 308 
 309         results[0] = x - lis3->read_data(lis3, OUTX);
 310         results[1] = y - lis3->read_data(lis3, OUTY);
 311         results[2] = z - lis3->read_data(lis3, OUTZ);
 312 
 313         ret = 0;
 314 
 315         if (lis3->whoami == WAI_8B) {
 316                 /* Restore original interrupt configuration */
 317                 atomic_dec(&lis3->wake_thread);
 318                 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
 319                 lis3->irq_cfg = irq_cfg;
 320 
 321                 if ((irq_cfg & LIS3_IRQ1_MASK) &&
 322                         lis3->data_ready_count[IRQ_LINE0] < 2) {
 323                         ret = SELFTEST_IRQ;
 324                         goto fail;
 325                 }
 326 
 327                 if ((irq_cfg & LIS3_IRQ2_MASK) &&
 328                         lis3->data_ready_count[IRQ_LINE1] < 2) {
 329                         ret = SELFTEST_IRQ;
 330                         goto fail;
 331                 }
 332         }
 333 
 334         if (lis3->pdata) {
 335                 int i;
 336                 for (i = 0; i < 3; i++) {
 337                         /* Check against selftest acceptance limits */
 338                         if ((results[i] < lis3->pdata->st_min_limits[i]) ||
 339                             (results[i] > lis3->pdata->st_max_limits[i])) {
 340                                 ret = SELFTEST_FAIL;
 341                                 goto fail;
 342                         }
 343                 }
 344         }
 345 
 346         /* test passed */
 347 fail:
 348         mutex_unlock(&lis3->mutex);
 349         return ret;
 350 }
 351 
 352 /*
 353  * Order of registers in the list affects to order of the restore process.
 354  * Perhaps it is a good idea to set interrupt enable register as a last one
 355  * after all other configurations
 356  */
 357 static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
 358                                FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
 359                                CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
 360                                CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
 361                                CTRL_REG1, CTRL_REG2, CTRL_REG3};
 362 
 363 static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
 364                                FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
 365                                DD_THSE_L, DD_THSE_H,
 366                                CTRL_REG1, CTRL_REG3, CTRL_REG2};
 367 
 368 static inline void lis3_context_save(struct lis3lv02d *lis3)
 369 {
 370         int i;
 371         for (i = 0; i < lis3->regs_size; i++)
 372                 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
 373         lis3->regs_stored = true;
 374 }
 375 
 376 static inline void lis3_context_restore(struct lis3lv02d *lis3)
 377 {
 378         int i;
 379         if (lis3->regs_stored)
 380                 for (i = 0; i < lis3->regs_size; i++)
 381                         lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
 382 }
 383 
 384 void lis3lv02d_poweroff(struct lis3lv02d *lis3)
 385 {
 386         if (lis3->reg_ctrl)
 387                 lis3_context_save(lis3);
 388         /* disable X,Y,Z axis and power down */
 389         lis3->write(lis3, CTRL_REG1, 0x00);
 390         if (lis3->reg_ctrl)
 391                 lis3->reg_ctrl(lis3, LIS3_REG_OFF);
 392 }
 393 EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
 394 
 395 int lis3lv02d_poweron(struct lis3lv02d *lis3)
 396 {
 397         int err;
 398         u8 reg;
 399 
 400         lis3->init(lis3);
 401 
 402         /*
 403          * Common configuration
 404          * BDU: (12 bits sensors only) LSB and MSB values are not updated until
 405          *      both have been read. So the value read will always be correct.
 406          * Set BOOT bit to refresh factory tuning values.
 407          */
 408         if (lis3->pdata) {
 409                 lis3->read(lis3, CTRL_REG2, &reg);
 410                 if (lis3->whoami ==  WAI_12B)
 411                         reg |= CTRL2_BDU | CTRL2_BOOT;
 412                 else if (lis3->whoami ==  WAI_3DLH)
 413                         reg |= CTRL2_BOOT_3DLH;
 414                 else
 415                         reg |= CTRL2_BOOT_8B;
 416                 lis3->write(lis3, CTRL_REG2, reg);
 417 
 418                 if (lis3->whoami ==  WAI_3DLH) {
 419                         lis3->read(lis3, CTRL_REG4, &reg);
 420                         reg |= CTRL4_BDU;
 421                         lis3->write(lis3, CTRL_REG4, reg);
 422                 }
 423         }
 424 
 425         err = lis3lv02d_get_pwron_wait(lis3);
 426         if (err)
 427                 return err;
 428 
 429         if (lis3->reg_ctrl)
 430                 lis3_context_restore(lis3);
 431 
 432         return 0;
 433 }
 434 EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
 435 
 436 
 437 static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
 438 {
 439         struct lis3lv02d *lis3 = pidev->private;
 440         int x, y, z;
 441 
 442         mutex_lock(&lis3->mutex);
 443         lis3lv02d_get_xyz(lis3, &x, &y, &z);
 444         input_report_abs(pidev->input, ABS_X, x);
 445         input_report_abs(pidev->input, ABS_Y, y);
 446         input_report_abs(pidev->input, ABS_Z, z);
 447         input_sync(pidev->input);
 448         mutex_unlock(&lis3->mutex);
 449 }
 450 
 451 static void lis3lv02d_joystick_open(struct input_polled_dev *pidev)
 452 {
 453         struct lis3lv02d *lis3 = pidev->private;
 454 
 455         if (lis3->pm_dev)
 456                 pm_runtime_get_sync(lis3->pm_dev);
 457 
 458         if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
 459                 atomic_set(&lis3->wake_thread, 1);
 460         /*
 461          * Update coordinates for the case where poll interval is 0 and
 462          * the chip in running purely under interrupt control
 463          */
 464         lis3lv02d_joystick_poll(pidev);
 465 }
 466 
 467 static void lis3lv02d_joystick_close(struct input_polled_dev *pidev)
 468 {
 469         struct lis3lv02d *lis3 = pidev->private;
 470 
 471         atomic_set(&lis3->wake_thread, 0);
 472         if (lis3->pm_dev)
 473                 pm_runtime_put(lis3->pm_dev);
 474 }
 475 
 476 static irqreturn_t lis302dl_interrupt(int irq, void *data)
 477 {
 478         struct lis3lv02d *lis3 = data;
 479 
 480         if (!test_bit(0, &lis3->misc_opened))
 481                 goto out;
 482 
 483         /*
 484          * Be careful: on some HP laptops the bios force DD when on battery and
 485          * the lid is closed. This leads to interrupts as soon as a little move
 486          * is done.
 487          */
 488         atomic_inc(&lis3->count);
 489 
 490         wake_up_interruptible(&lis3->misc_wait);
 491         kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
 492 out:
 493         if (atomic_read(&lis3->wake_thread))
 494                 return IRQ_WAKE_THREAD;
 495         return IRQ_HANDLED;
 496 }
 497 
 498 static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
 499 {
 500         struct input_dev *dev = lis3->idev->input;
 501         u8 click_src;
 502 
 503         mutex_lock(&lis3->mutex);
 504         lis3->read(lis3, CLICK_SRC, &click_src);
 505 
 506         if (click_src & CLICK_SINGLE_X) {
 507                 input_report_key(dev, lis3->mapped_btns[0], 1);
 508                 input_report_key(dev, lis3->mapped_btns[0], 0);
 509         }
 510 
 511         if (click_src & CLICK_SINGLE_Y) {
 512                 input_report_key(dev, lis3->mapped_btns[1], 1);
 513                 input_report_key(dev, lis3->mapped_btns[1], 0);
 514         }
 515 
 516         if (click_src & CLICK_SINGLE_Z) {
 517                 input_report_key(dev, lis3->mapped_btns[2], 1);
 518                 input_report_key(dev, lis3->mapped_btns[2], 0);
 519         }
 520         input_sync(dev);
 521         mutex_unlock(&lis3->mutex);
 522 }
 523 
 524 static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
 525 {
 526         int dummy;
 527 
 528         /* Dummy read to ack interrupt */
 529         lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
 530         lis3->data_ready_count[index]++;
 531 }
 532 
 533 static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
 534 {
 535         struct lis3lv02d *lis3 = data;
 536         u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;
 537 
 538         if (irq_cfg == LIS3_IRQ1_CLICK)
 539                 lis302dl_interrupt_handle_click(lis3);
 540         else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
 541                 lis302dl_data_ready(lis3, IRQ_LINE0);
 542         else
 543                 lis3lv02d_joystick_poll(lis3->idev);
 544 
 545         return IRQ_HANDLED;
 546 }
 547 
 548 static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
 549 {
 550         struct lis3lv02d *lis3 = data;
 551         u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;
 552 
 553         if (irq_cfg == LIS3_IRQ2_CLICK)
 554                 lis302dl_interrupt_handle_click(lis3);
 555         else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
 556                 lis302dl_data_ready(lis3, IRQ_LINE1);
 557         else
 558                 lis3lv02d_joystick_poll(lis3->idev);
 559 
 560         return IRQ_HANDLED;
 561 }
 562 
 563 static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
 564 {
 565         struct lis3lv02d *lis3 = container_of(file->private_data,
 566                                               struct lis3lv02d, miscdev);
 567 
 568         if (test_and_set_bit(0, &lis3->misc_opened))
 569                 return -EBUSY; /* already open */
 570 
 571         if (lis3->pm_dev)
 572                 pm_runtime_get_sync(lis3->pm_dev);
 573 
 574         atomic_set(&lis3->count, 0);
 575         return 0;
 576 }
 577 
 578 static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
 579 {
 580         struct lis3lv02d *lis3 = container_of(file->private_data,
 581                                               struct lis3lv02d, miscdev);
 582 
 583         clear_bit(0, &lis3->misc_opened); /* release the device */
 584         if (lis3->pm_dev)
 585                 pm_runtime_put(lis3->pm_dev);
 586         return 0;
 587 }
 588 
 589 static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
 590                                 size_t count, loff_t *pos)
 591 {
 592         struct lis3lv02d *lis3 = container_of(file->private_data,
 593                                               struct lis3lv02d, miscdev);
 594 
 595         DECLARE_WAITQUEUE(wait, current);
 596         u32 data;
 597         unsigned char byte_data;
 598         ssize_t retval = 1;
 599 
 600         if (count < 1)
 601                 return -EINVAL;
 602 
 603         add_wait_queue(&lis3->misc_wait, &wait);
 604         while (true) {
 605                 set_current_state(TASK_INTERRUPTIBLE);
 606                 data = atomic_xchg(&lis3->count, 0);
 607                 if (data)
 608                         break;
 609 
 610                 if (file->f_flags & O_NONBLOCK) {
 611                         retval = -EAGAIN;
 612                         goto out;
 613                 }
 614 
 615                 if (signal_pending(current)) {
 616                         retval = -ERESTARTSYS;
 617                         goto out;
 618                 }
 619 
 620                 schedule();
 621         }
 622 
 623         if (data < 255)
 624                 byte_data = data;
 625         else
 626                 byte_data = 255;
 627 
 628         /* make sure we are not going into copy_to_user() with
 629          * TASK_INTERRUPTIBLE state */
 630         set_current_state(TASK_RUNNING);
 631         if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
 632                 retval = -EFAULT;
 633 
 634 out:
 635         __set_current_state(TASK_RUNNING);
 636         remove_wait_queue(&lis3->misc_wait, &wait);
 637 
 638         return retval;
 639 }
 640 
 641 static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)
 642 {
 643         struct lis3lv02d *lis3 = container_of(file->private_data,
 644                                               struct lis3lv02d, miscdev);
 645 
 646         poll_wait(file, &lis3->misc_wait, wait);
 647         if (atomic_read(&lis3->count))
 648                 return EPOLLIN | EPOLLRDNORM;
 649         return 0;
 650 }
 651 
 652 static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
 653 {
 654         struct lis3lv02d *lis3 = container_of(file->private_data,
 655                                               struct lis3lv02d, miscdev);
 656 
 657         return fasync_helper(fd, file, on, &lis3->async_queue);
 658 }
 659 
 660 static const struct file_operations lis3lv02d_misc_fops = {
 661         .owner   = THIS_MODULE,
 662         .llseek  = no_llseek,
 663         .read    = lis3lv02d_misc_read,
 664         .open    = lis3lv02d_misc_open,
 665         .release = lis3lv02d_misc_release,
 666         .poll    = lis3lv02d_misc_poll,
 667         .fasync  = lis3lv02d_misc_fasync,
 668 };
 669 
 670 int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
 671 {
 672         struct input_dev *input_dev;
 673         int err;
 674         int max_val, fuzz, flat;
 675         int btns[] = {BTN_X, BTN_Y, BTN_Z};
 676 
 677         if (lis3->idev)
 678                 return -EINVAL;
 679 
 680         lis3->idev = input_allocate_polled_device();
 681         if (!lis3->idev)
 682                 return -ENOMEM;
 683 
 684         lis3->idev->poll = lis3lv02d_joystick_poll;
 685         lis3->idev->open = lis3lv02d_joystick_open;
 686         lis3->idev->close = lis3lv02d_joystick_close;
 687         lis3->idev->poll_interval = MDPS_POLL_INTERVAL;
 688         lis3->idev->poll_interval_min = MDPS_POLL_MIN;
 689         lis3->idev->poll_interval_max = MDPS_POLL_MAX;
 690         lis3->idev->private = lis3;
 691         input_dev = lis3->idev->input;
 692 
 693         input_dev->name       = "ST LIS3LV02DL Accelerometer";
 694         input_dev->phys       = DRIVER_NAME "/input0";
 695         input_dev->id.bustype = BUS_HOST;
 696         input_dev->id.vendor  = 0;
 697         input_dev->dev.parent = &lis3->pdev->dev;
 698 
 699         set_bit(EV_ABS, input_dev->evbit);
 700         max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
 701         if (lis3->whoami == WAI_12B) {
 702                 fuzz = LIS3_DEFAULT_FUZZ_12B;
 703                 flat = LIS3_DEFAULT_FLAT_12B;
 704         } else {
 705                 fuzz = LIS3_DEFAULT_FUZZ_8B;
 706                 flat = LIS3_DEFAULT_FLAT_8B;
 707         }
 708         fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
 709         flat = (flat * lis3->scale) / LIS3_ACCURACY;
 710 
 711         input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
 712         input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
 713         input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);
 714 
 715         lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
 716         lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
 717         lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);
 718 
 719         err = input_register_polled_device(lis3->idev);
 720         if (err) {
 721                 input_free_polled_device(lis3->idev);
 722                 lis3->idev = NULL;
 723         }
 724 
 725         return err;
 726 }
 727 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
 728 
 729 void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
 730 {
 731         if (lis3->irq)
 732                 free_irq(lis3->irq, lis3);
 733         if (lis3->pdata && lis3->pdata->irq2)
 734                 free_irq(lis3->pdata->irq2, lis3);
 735 
 736         if (!lis3->idev)
 737                 return;
 738 
 739         if (lis3->irq)
 740                 misc_deregister(&lis3->miscdev);
 741         input_unregister_polled_device(lis3->idev);
 742         input_free_polled_device(lis3->idev);
 743         lis3->idev = NULL;
 744 }
 745 EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
 746 
 747 /* Sysfs stuff */
 748 static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
 749 {
 750         /*
 751          * SYSFS functions are fast visitors so put-call
 752          * immediately after the get-call. However, keep
 753          * chip running for a while and schedule delayed
 754          * suspend. This way periodic sysfs calls doesn't
 755          * suffer from relatively long power up time.
 756          */
 757 
 758         if (lis3->pm_dev) {
 759                 pm_runtime_get_sync(lis3->pm_dev);
 760                 pm_runtime_put_noidle(lis3->pm_dev);
 761                 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
 762         }
 763 }
 764 
 765 static ssize_t lis3lv02d_selftest_show(struct device *dev,
 766                                 struct device_attribute *attr, char *buf)
 767 {
 768         struct lis3lv02d *lis3 = dev_get_drvdata(dev);
 769         s16 values[3];
 770 
 771         static const char ok[] = "OK";
 772         static const char fail[] = "FAIL";
 773         static const char irq[] = "FAIL_IRQ";
 774         const char *res;
 775 
 776         lis3lv02d_sysfs_poweron(lis3);
 777         switch (lis3lv02d_selftest(lis3, values)) {
 778         case SELFTEST_FAIL:
 779                 res = fail;
 780                 break;
 781         case SELFTEST_IRQ:
 782                 res = irq;
 783                 break;
 784         case SELFTEST_OK:
 785         default:
 786                 res = ok;
 787                 break;
 788         }
 789         return sprintf(buf, "%s %d %d %d\n", res,
 790                 values[0], values[1], values[2]);
 791 }
 792 
 793 static ssize_t lis3lv02d_position_show(struct device *dev,
 794                                 struct device_attribute *attr, char *buf)
 795 {
 796         struct lis3lv02d *lis3 = dev_get_drvdata(dev);
 797         int x, y, z;
 798 
 799         lis3lv02d_sysfs_poweron(lis3);
 800         mutex_lock(&lis3->mutex);
 801         lis3lv02d_get_xyz(lis3, &x, &y, &z);
 802         mutex_unlock(&lis3->mutex);
 803         return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
 804 }
 805 
 806 static ssize_t lis3lv02d_rate_show(struct device *dev,
 807                         struct device_attribute *attr, char *buf)
 808 {
 809         struct lis3lv02d *lis3 = dev_get_drvdata(dev);
 810 
 811         lis3lv02d_sysfs_poweron(lis3);
 812         return sprintf(buf, "%d\n", lis3lv02d_get_odr(lis3));
 813 }
 814 
 815 static ssize_t lis3lv02d_rate_set(struct device *dev,
 816                                 struct device_attribute *attr, const char *buf,
 817                                 size_t count)
 818 {
 819         struct lis3lv02d *lis3 = dev_get_drvdata(dev);
 820         unsigned long rate;
 821         int ret;
 822 
 823         ret = kstrtoul(buf, 0, &rate);
 824         if (ret)
 825                 return ret;
 826 
 827         lis3lv02d_sysfs_poweron(lis3);
 828         if (lis3lv02d_set_odr(lis3, rate))
 829                 return -EINVAL;
 830 
 831         return count;
 832 }
 833 
 834 static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
 835 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
 836 static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
 837                                             lis3lv02d_rate_set);
 838 
 839 static struct attribute *lis3lv02d_attributes[] = {
 840         &dev_attr_selftest.attr,
 841         &dev_attr_position.attr,
 842         &dev_attr_rate.attr,
 843         NULL
 844 };
 845 
 846 static const struct attribute_group lis3lv02d_attribute_group = {
 847         .attrs = lis3lv02d_attributes
 848 };
 849 
 850 
 851 static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
 852 {
 853         lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
 854         if (IS_ERR(lis3->pdev))
 855                 return PTR_ERR(lis3->pdev);
 856 
 857         platform_set_drvdata(lis3->pdev, lis3);
 858         return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 859 }
 860 
 861 int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
 862 {
 863         sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
 864         platform_device_unregister(lis3->pdev);
 865         if (lis3->pm_dev) {
 866                 /* Barrier after the sysfs remove */
 867                 pm_runtime_barrier(lis3->pm_dev);
 868 
 869                 /* SYSFS may have left chip running. Turn off if necessary */
 870                 if (!pm_runtime_suspended(lis3->pm_dev))
 871                         lis3lv02d_poweroff(lis3);
 872 
 873                 pm_runtime_disable(lis3->pm_dev);
 874                 pm_runtime_set_suspended(lis3->pm_dev);
 875         }
 876         kfree(lis3->reg_cache);
 877         return 0;
 878 }
 879 EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
 880 
 881 static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
 882                                 struct lis3lv02d_platform_data *p)
 883 {
 884         int err;
 885         int ctrl2 = p->hipass_ctrl;
 886 
 887         if (p->click_flags) {
 888                 lis3->write(lis3, CLICK_CFG, p->click_flags);
 889                 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
 890                 lis3->write(lis3, CLICK_LATENCY, p->click_latency);
 891                 lis3->write(lis3, CLICK_WINDOW, p->click_window);
 892                 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
 893                 lis3->write(lis3, CLICK_THSY_X,
 894                         (p->click_thresh_x & 0xf) |
 895                         (p->click_thresh_y << 4));
 896 
 897                 if (lis3->idev) {
 898                         struct input_dev *input_dev = lis3->idev->input;
 899                         input_set_capability(input_dev, EV_KEY, BTN_X);
 900                         input_set_capability(input_dev, EV_KEY, BTN_Y);
 901                         input_set_capability(input_dev, EV_KEY, BTN_Z);
 902                 }
 903         }
 904 
 905         if (p->wakeup_flags) {
 906                 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
 907                 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
 908                 /* pdata value + 1 to keep this backward compatible*/
 909                 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
 910                 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
 911         }
 912 
 913         if (p->wakeup_flags2) {
 914                 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
 915                 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
 916                 /* pdata value + 1 to keep this backward compatible*/
 917                 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
 918                 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
 919         }
 920         /* Configure hipass filters */
 921         lis3->write(lis3, CTRL_REG2, ctrl2);
 922 
 923         if (p->irq2) {
 924                 err = request_threaded_irq(p->irq2,
 925                                         NULL,
 926                                         lis302dl_interrupt_thread2_8b,
 927                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT |
 928                                         (p->irq_flags2 & IRQF_TRIGGER_MASK),
 929                                         DRIVER_NAME, lis3);
 930                 if (err < 0)
 931                         pr_err("No second IRQ. Limited functionality\n");
 932         }
 933 }
 934 
 935 #ifdef CONFIG_OF
 936 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
 937 {
 938         struct lis3lv02d_platform_data *pdata;
 939         struct device_node *np = lis3->of_node;
 940         u32 val;
 941         s32 sval;
 942 
 943         if (!lis3->of_node)
 944                 return 0;
 945 
 946         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 947         if (!pdata)
 948                 return -ENOMEM;
 949 
 950         if (of_get_property(np, "st,click-single-x", NULL))
 951                 pdata->click_flags |= LIS3_CLICK_SINGLE_X;
 952         if (of_get_property(np, "st,click-double-x", NULL))
 953                 pdata->click_flags |= LIS3_CLICK_DOUBLE_X;
 954 
 955         if (of_get_property(np, "st,click-single-y", NULL))
 956                 pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
 957         if (of_get_property(np, "st,click-double-y", NULL))
 958                 pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;
 959 
 960         if (of_get_property(np, "st,click-single-z", NULL))
 961                 pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
 962         if (of_get_property(np, "st,click-double-z", NULL))
 963                 pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;
 964 
 965         if (!of_property_read_u32(np, "st,click-threshold-x", &val))
 966                 pdata->click_thresh_x = val;
 967         if (!of_property_read_u32(np, "st,click-threshold-y", &val))
 968                 pdata->click_thresh_y = val;
 969         if (!of_property_read_u32(np, "st,click-threshold-z", &val))
 970                 pdata->click_thresh_z = val;
 971 
 972         if (!of_property_read_u32(np, "st,click-time-limit", &val))
 973                 pdata->click_time_limit = val;
 974         if (!of_property_read_u32(np, "st,click-latency", &val))
 975                 pdata->click_latency = val;
 976         if (!of_property_read_u32(np, "st,click-window", &val))
 977                 pdata->click_window = val;
 978 
 979         if (of_get_property(np, "st,irq1-disable", NULL))
 980                 pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
 981         if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
 982                 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
 983         if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
 984                 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
 985         if (of_get_property(np, "st,irq1-data-ready", NULL))
 986                 pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
 987         if (of_get_property(np, "st,irq1-click", NULL))
 988                 pdata->irq_cfg |= LIS3_IRQ1_CLICK;
 989 
 990         if (of_get_property(np, "st,irq2-disable", NULL))
 991                 pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
 992         if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
 993                 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
 994         if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
 995                 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
 996         if (of_get_property(np, "st,irq2-data-ready", NULL))
 997                 pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
 998         if (of_get_property(np, "st,irq2-click", NULL))
 999                 pdata->irq_cfg |= LIS3_IRQ2_CLICK;
1000 
1001         if (of_get_property(np, "st,irq-open-drain", NULL))
1002                 pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
1003         if (of_get_property(np, "st,irq-active-low", NULL))
1004                 pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;
1005 
1006         if (!of_property_read_u32(np, "st,wu-duration-1", &val))
1007                 pdata->duration1 = val;
1008         if (!of_property_read_u32(np, "st,wu-duration-2", &val))
1009                 pdata->duration2 = val;
1010 
1011         if (of_get_property(np, "st,wakeup-x-lo", NULL))
1012                 pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
1013         if (of_get_property(np, "st,wakeup-x-hi", NULL))
1014                 pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
1015         if (of_get_property(np, "st,wakeup-y-lo", NULL))
1016                 pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
1017         if (of_get_property(np, "st,wakeup-y-hi", NULL))
1018                 pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
1019         if (of_get_property(np, "st,wakeup-z-lo", NULL))
1020                 pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
1021         if (of_get_property(np, "st,wakeup-z-hi", NULL))
1022                 pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
1023         if (of_get_property(np, "st,wakeup-threshold", &val))
1024                 pdata->wakeup_thresh = val;
1025 
1026         if (of_get_property(np, "st,wakeup2-x-lo", NULL))
1027                 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
1028         if (of_get_property(np, "st,wakeup2-x-hi", NULL))
1029                 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
1030         if (of_get_property(np, "st,wakeup2-y-lo", NULL))
1031                 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
1032         if (of_get_property(np, "st,wakeup2-y-hi", NULL))
1033                 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
1034         if (of_get_property(np, "st,wakeup2-z-lo", NULL))
1035                 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
1036         if (of_get_property(np, "st,wakeup2-z-hi", NULL))
1037                 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
1038         if (of_get_property(np, "st,wakeup2-threshold", &val))
1039                 pdata->wakeup_thresh2 = val;
1040 
1041         if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
1042                 switch (val) {
1043                 case 1:
1044                         pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
1045                         break;
1046                 case 2:
1047                         pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
1048                         break;
1049                 case 4:
1050                         pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
1051                         break;
1052                 case 8:
1053                         pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
1054                         break;
1055                 }
1056         }
1057 
1058         if (of_get_property(np, "st,hipass1-disable", NULL))
1059                 pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
1060         if (of_get_property(np, "st,hipass2-disable", NULL))
1061                 pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;
1062 
1063         if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
1064                 pdata->axis_x = sval;
1065         if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
1066                 pdata->axis_y = sval;
1067         if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
1068                 pdata->axis_z = sval;
1069 
1070         if (of_get_property(np, "st,default-rate", NULL))
1071                 pdata->default_rate = val;
1072 
1073         if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
1074                 pdata->st_min_limits[0] = sval;
1075         if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
1076                 pdata->st_min_limits[1] = sval;
1077         if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
1078                 pdata->st_min_limits[2] = sval;
1079 
1080         if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
1081                 pdata->st_max_limits[0] = sval;
1082         if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
1083                 pdata->st_max_limits[1] = sval;
1084         if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
1085                 pdata->st_max_limits[2] = sval;
1086 
1087 
1088         lis3->pdata = pdata;
1089 
1090         return 0;
1091 }
1092 
1093 #else
1094 int lis3lv02d_init_dt(struct lis3lv02d *lis3)
1095 {
1096         return 0;
1097 }
1098 #endif
1099 EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);
1100 
1101 /*
1102  * Initialise the accelerometer and the various subsystems.
1103  * Should be rather independent of the bus system.
1104  */
1105 int lis3lv02d_init_device(struct lis3lv02d *lis3)
1106 {
1107         int err;
1108         irq_handler_t thread_fn;
1109         int irq_flags = 0;
1110 
1111         lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);
1112 
1113         switch (lis3->whoami) {
1114         case WAI_12B:
1115                 pr_info("12 bits sensor found\n");
1116                 lis3->read_data = lis3lv02d_read_12;
1117                 lis3->mdps_max_val = 2048;
1118                 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
1119                 lis3->odrs = lis3_12_rates;
1120                 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
1121                 lis3->scale = LIS3_SENSITIVITY_12B;
1122                 lis3->regs = lis3_wai12_regs;
1123                 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
1124                 break;
1125         case WAI_8B:
1126                 pr_info("8 bits sensor found\n");
1127                 lis3->read_data = lis3lv02d_read_8;
1128                 lis3->mdps_max_val = 128;
1129                 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1130                 lis3->odrs = lis3_8_rates;
1131                 lis3->odr_mask = CTRL1_DR;
1132                 lis3->scale = LIS3_SENSITIVITY_8B;
1133                 lis3->regs = lis3_wai8_regs;
1134                 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
1135                 break;
1136         case WAI_3DC:
1137                 pr_info("8 bits 3DC sensor found\n");
1138                 lis3->read_data = lis3lv02d_read_8;
1139                 lis3->mdps_max_val = 128;
1140                 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1141                 lis3->odrs = lis3_3dc_rates;
1142                 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
1143                 lis3->scale = LIS3_SENSITIVITY_8B;
1144                 break;
1145         case WAI_3DLH:
1146                 pr_info("16 bits lis331dlh sensor found\n");
1147                 lis3->read_data = lis331dlh_read_data;
1148                 lis3->mdps_max_val = 2048; /* 12 bits for 2G */
1149                 lis3->shift_adj = SHIFT_ADJ_2G;
1150                 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
1151                 lis3->odrs = lis3_3dlh_rates;
1152                 lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
1153                 lis3->scale = LIS3DLH_SENSITIVITY_2G;
1154                 break;
1155         default:
1156                 pr_err("unknown sensor type 0x%X\n", lis3->whoami);
1157                 return -EINVAL;
1158         }
1159 
1160         lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
1161                                      sizeof(lis3_wai12_regs)), GFP_KERNEL);
1162 
1163         if (lis3->reg_cache == NULL) {
1164                 printk(KERN_ERR DRIVER_NAME "out of memory\n");
1165                 return -ENOMEM;
1166         }
1167 
1168         mutex_init(&lis3->mutex);
1169         atomic_set(&lis3->wake_thread, 0);
1170 
1171         lis3lv02d_add_fs(lis3);
1172         err = lis3lv02d_poweron(lis3);
1173         if (err) {
1174                 lis3lv02d_remove_fs(lis3);
1175                 return err;
1176         }
1177 
1178         if (lis3->pm_dev) {
1179                 pm_runtime_set_active(lis3->pm_dev);
1180                 pm_runtime_enable(lis3->pm_dev);
1181         }
1182 
1183         if (lis3lv02d_joystick_enable(lis3))
1184                 pr_err("joystick initialization failed\n");
1185 
1186         /* passing in platform specific data is purely optional and only
1187          * used by the SPI transport layer at the moment */
1188         if (lis3->pdata) {
1189                 struct lis3lv02d_platform_data *p = lis3->pdata;
1190 
1191                 if (lis3->whoami == WAI_8B)
1192                         lis3lv02d_8b_configure(lis3, p);
1193 
1194                 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;
1195 
1196                 lis3->irq_cfg = p->irq_cfg;
1197                 if (p->irq_cfg)
1198                         lis3->write(lis3, CTRL_REG3, p->irq_cfg);
1199 
1200                 if (p->default_rate)
1201                         lis3lv02d_set_odr(lis3, p->default_rate);
1202         }
1203 
1204         /* bail if we did not get an IRQ from the bus layer */
1205         if (!lis3->irq) {
1206                 pr_debug("No IRQ. Disabling /dev/freefall\n");
1207                 goto out;
1208         }
1209 
1210         /*
1211          * The sensor can generate interrupts for free-fall and direction
1212          * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
1213          * the things simple and _fast_ we activate it only for free-fall, so
1214          * no need to read register (very slow with ACPI). For the same reason,
1215          * we forbid shared interrupts.
1216          *
1217          * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
1218          * io-apic is not configurable (and generates a warning) but I keep it
1219          * in case of support for other hardware.
1220          */
1221         if (lis3->pdata && lis3->whoami == WAI_8B)
1222                 thread_fn = lis302dl_interrupt_thread1_8b;
1223         else
1224                 thread_fn = NULL;
1225 
1226         err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
1227                                 thread_fn,
1228                                 IRQF_TRIGGER_RISING | IRQF_ONESHOT |
1229                                 irq_flags,
1230                                 DRIVER_NAME, lis3);
1231 
1232         if (err < 0) {
1233                 pr_err("Cannot get IRQ\n");
1234                 goto out;
1235         }
1236 
1237         lis3->miscdev.minor     = MISC_DYNAMIC_MINOR;
1238         lis3->miscdev.name      = "freefall";
1239         lis3->miscdev.fops      = &lis3lv02d_misc_fops;
1240 
1241         if (misc_register(&lis3->miscdev))
1242                 pr_err("misc_register failed\n");
1243 out:
1244         return 0;
1245 }
1246 EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
1247 
1248 MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
1249 MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
1250 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/misc/lis3lv02d/lis3lv02d.c

DEFINITIONS
