1266 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver4 *5 * Copyright (C) 2007-2008 Yan Burman6 * Copyright (C) 2008 Eric Piel7 * Copyright (C) 2008-2009 Pavel Machek8 */9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt11 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.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.h>30#include "lis3lv02d.h"31 32#define DRIVER_NAME "lis3lv02d"33 34/* joystick device poll interval in milliseconds */35#define MDPS_POLL_INTERVAL 5036#define MDPS_POLL_MIN 037#define MDPS_POLL_MAX 200038 39#define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */40 41#define SELFTEST_OK 042#define SELFTEST_FAIL -143#define SELFTEST_IRQ -244 45#define IRQ_LINE0 046#define IRQ_LINE1 147 48/*49 * The sensor can also generate interrupts (DRDY) but it's pretty pointless50 * because they are generated even if the data do not change. So it's better51 * to keep the interrupt for the free-fall event. The values are updated at52 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on53 * some low processor, we poll the sensor only at 20Hz... enough for the54 * 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 mG62 * LIS302D spec says: 18 mG / digit63 * LIS3_ACCURACY is used to increase accuracy of the intermediate64 * calculation results.65 */66#define LIS3_ACCURACY 102467/* 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 for74 * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit75 * 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 479 80#define LIS3_DEFAULT_FUZZ_12B 381#define LIS3_DEFAULT_FLAT_12B 382#define LIS3_DEFAULT_FUZZ_8B 183#define LIS3_DEFAULT_FLAT_8B 184 85struct lis3lv02d lis3_dev = {86 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),87};88EXPORT_SYMBOL_GPL(lis3_dev);89 90/* just like param_set_int() but does sanity-check so that it won't point91 * over the axis array size92 */93static 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 106static 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 113module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);114MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");115 116static 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 125static 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 */136static 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 converted150 * @axis: 1,2,3 - can also be negative151 * @hw_values: raw values returned by the hardware152 *153 * Returns the converted value.154 */155static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])156{157 if (axis > 0)158 return hw_values[axis - 1];159 else160 return -hw_values[-axis - 1];161}162 163/**164 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer165 * @lis3: pointer to the device struct166 * @x: where to store the X axis value167 * @y: where to store the Y axis value168 * @z: where to store the Z axis value169 *170 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ171 */172static 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 */205static int lis3_12_rates[4] = {40, 160, 640, 2560};206static int lis3_8_rates[2] = {100, 400};207static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};208static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};209 210/* ODR is Output Data Rate */211static int lis3lv02d_get_odr_index(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 (ctrl >> shift);220}221 222static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)223{224 int odr_idx = lis3lv02d_get_odr_index(lis3);225 int div = lis3->odrs[odr_idx];226 227 if (div == 0) {228 if (odr_idx == 0) {229 /* Power-down mode, not sampling no need to sleep */230 return 0;231 }232 233 dev_err(&lis3->pdev->dev, "Error unknown odrs-index: %d\n", odr_idx);234 return -ENXIO;235 }236 237 /* LIS3 power on delay is quite long */238 msleep(lis3->pwron_delay / div);239 return 0;240}241 242static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)243{244 u8 ctrl;245 int i, len, shift;246 247 if (!rate)248 return -EINVAL;249 250 lis3->read(lis3, CTRL_REG1, &ctrl);251 ctrl &= ~lis3->odr_mask;252 len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */253 shift = ffs(lis3->odr_mask) - 1;254 255 for (i = 0; i < len; i++)256 if (lis3->odrs[i] == rate) {257 lis3->write(lis3, CTRL_REG1,258 ctrl | (i << shift));259 return 0;260 }261 return -EINVAL;262}263 264static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])265{266 u8 ctlreg, reg;267 s16 x, y, z;268 u8 selftest;269 int ret;270 u8 ctrl_reg_data;271 unsigned char irq_cfg;272 273 mutex_lock(&lis3->mutex);274 275 irq_cfg = lis3->irq_cfg;276 if (lis3->whoami == WAI_8B) {277 lis3->data_ready_count[IRQ_LINE0] = 0;278 lis3->data_ready_count[IRQ_LINE1] = 0;279 280 /* Change interrupt cfg to data ready for selftest */281 atomic_inc(&lis3->wake_thread);282 lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;283 lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);284 lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &285 ~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |286 (LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));287 }288 289 if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {290 ctlreg = CTRL_REG4;291 selftest = CTRL4_ST0;292 } else {293 ctlreg = CTRL_REG1;294 if (lis3->whoami == WAI_12B)295 selftest = CTRL1_ST;296 else297 selftest = CTRL1_STP;298 }299 300 lis3->read(lis3, ctlreg, ®);301 lis3->write(lis3, ctlreg, (reg | selftest));302 ret = lis3lv02d_get_pwron_wait(lis3);303 if (ret)304 goto fail;305 306 /* Read directly to avoid axis remap */307 x = lis3->read_data(lis3, OUTX);308 y = lis3->read_data(lis3, OUTY);309 z = lis3->read_data(lis3, OUTZ);310 311 /* back to normal settings */312 lis3->write(lis3, ctlreg, reg);313 ret = lis3lv02d_get_pwron_wait(lis3);314 if (ret)315 goto fail;316 317 results[0] = x - lis3->read_data(lis3, OUTX);318 results[1] = y - lis3->read_data(lis3, OUTY);319 results[2] = z - lis3->read_data(lis3, OUTZ);320 321 ret = 0;322 323 if (lis3->whoami == WAI_8B) {324 /* Restore original interrupt configuration */325 atomic_dec(&lis3->wake_thread);326 lis3->write(lis3, CTRL_REG3, ctrl_reg_data);327 lis3->irq_cfg = irq_cfg;328 329 if ((irq_cfg & LIS3_IRQ1_MASK) &&330 lis3->data_ready_count[IRQ_LINE0] < 2) {331 ret = SELFTEST_IRQ;332 goto fail;333 }334 335 if ((irq_cfg & LIS3_IRQ2_MASK) &&336 lis3->data_ready_count[IRQ_LINE1] < 2) {337 ret = SELFTEST_IRQ;338 goto fail;339 }340 }341 342 if (lis3->pdata) {343 int i;344 for (i = 0; i < 3; i++) {345 /* Check against selftest acceptance limits */346 if ((results[i] < lis3->pdata->st_min_limits[i]) ||347 (results[i] > lis3->pdata->st_max_limits[i])) {348 ret = SELFTEST_FAIL;349 goto fail;350 }351 }352 }353 354 /* test passed */355fail:356 mutex_unlock(&lis3->mutex);357 return ret;358}359 360/*361 * Order of registers in the list affects to order of the restore process.362 * Perhaps it is a good idea to set interrupt enable register as a last one363 * after all other configurations364 */365static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,366 FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,367 CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,368 CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,369 CTRL_REG1, CTRL_REG2, CTRL_REG3};370 371static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,372 FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,373 DD_THSE_L, DD_THSE_H,374 CTRL_REG1, CTRL_REG3, CTRL_REG2};375 376static inline void lis3_context_save(struct lis3lv02d *lis3)377{378 int i;379 for (i = 0; i < lis3->regs_size; i++)380 lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);381 lis3->regs_stored = true;382}383 384static inline void lis3_context_restore(struct lis3lv02d *lis3)385{386 int i;387 if (lis3->regs_stored)388 for (i = 0; i < lis3->regs_size; i++)389 lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);390}391 392void lis3lv02d_poweroff(struct lis3lv02d *lis3)393{394 if (lis3->reg_ctrl)395 lis3_context_save(lis3);396 /* disable X,Y,Z axis and power down */397 lis3->write(lis3, CTRL_REG1, 0x00);398 if (lis3->reg_ctrl)399 lis3->reg_ctrl(lis3, LIS3_REG_OFF);400}401EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);402 403int lis3lv02d_poweron(struct lis3lv02d *lis3)404{405 int err;406 u8 reg;407 408 lis3->init(lis3);409 410 /*411 * Common configuration412 * BDU: (12 bits sensors only) LSB and MSB values are not updated until413 * both have been read. So the value read will always be correct.414 * Set BOOT bit to refresh factory tuning values.415 */416 if (lis3->pdata) {417 lis3->read(lis3, CTRL_REG2, ®);418 if (lis3->whoami == WAI_12B)419 reg |= CTRL2_BDU | CTRL2_BOOT;420 else if (lis3->whoami == WAI_3DLH)421 reg |= CTRL2_BOOT_3DLH;422 else423 reg |= CTRL2_BOOT_8B;424 lis3->write(lis3, CTRL_REG2, reg);425 426 if (lis3->whoami == WAI_3DLH) {427 lis3->read(lis3, CTRL_REG4, ®);428 reg |= CTRL4_BDU;429 lis3->write(lis3, CTRL_REG4, reg);430 }431 }432 433 err = lis3lv02d_get_pwron_wait(lis3);434 if (err)435 return err;436 437 if (lis3->reg_ctrl)438 lis3_context_restore(lis3);439 440 return 0;441}442EXPORT_SYMBOL_GPL(lis3lv02d_poweron);443 444 445static void lis3lv02d_joystick_poll(struct input_dev *input)446{447 struct lis3lv02d *lis3 = input_get_drvdata(input);448 int x, y, z;449 450 mutex_lock(&lis3->mutex);451 lis3lv02d_get_xyz(lis3, &x, &y, &z);452 input_report_abs(input, ABS_X, x);453 input_report_abs(input, ABS_Y, y);454 input_report_abs(input, ABS_Z, z);455 input_sync(input);456 mutex_unlock(&lis3->mutex);457}458 459static int lis3lv02d_joystick_open(struct input_dev *input)460{461 struct lis3lv02d *lis3 = input_get_drvdata(input);462 463 if (lis3->pm_dev)464 pm_runtime_get_sync(lis3->pm_dev);465 466 if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)467 atomic_set(&lis3->wake_thread, 1);468 /*469 * Update coordinates for the case where poll interval is 0 and470 * the chip in running purely under interrupt control471 */472 lis3lv02d_joystick_poll(input);473 474 return 0;475}476 477static void lis3lv02d_joystick_close(struct input_dev *input)478{479 struct lis3lv02d *lis3 = input_get_drvdata(input);480 481 atomic_set(&lis3->wake_thread, 0);482 if (lis3->pm_dev)483 pm_runtime_put(lis3->pm_dev);484}485 486static irqreturn_t lis302dl_interrupt(int irq, void *data)487{488 struct lis3lv02d *lis3 = data;489 490 if (!test_bit(0, &lis3->misc_opened))491 goto out;492 493 /*494 * Be careful: on some HP laptops the bios force DD when on battery and495 * the lid is closed. This leads to interrupts as soon as a little move496 * is done.497 */498 atomic_inc(&lis3->count);499 500 wake_up_interruptible(&lis3->misc_wait);501 kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);502out:503 if (atomic_read(&lis3->wake_thread))504 return IRQ_WAKE_THREAD;505 return IRQ_HANDLED;506}507 508static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)509{510 struct input_dev *dev = lis3->idev;511 u8 click_src;512 513 mutex_lock(&lis3->mutex);514 lis3->read(lis3, CLICK_SRC, &click_src);515 516 if (click_src & CLICK_SINGLE_X) {517 input_report_key(dev, lis3->mapped_btns[0], 1);518 input_report_key(dev, lis3->mapped_btns[0], 0);519 }520 521 if (click_src & CLICK_SINGLE_Y) {522 input_report_key(dev, lis3->mapped_btns[1], 1);523 input_report_key(dev, lis3->mapped_btns[1], 0);524 }525 526 if (click_src & CLICK_SINGLE_Z) {527 input_report_key(dev, lis3->mapped_btns[2], 1);528 input_report_key(dev, lis3->mapped_btns[2], 0);529 }530 input_sync(dev);531 mutex_unlock(&lis3->mutex);532}533 534static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)535{536 int dummy;537 538 /* Dummy read to ack interrupt */539 lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);540 lis3->data_ready_count[index]++;541}542 543static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)544{545 struct lis3lv02d *lis3 = data;546 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;547 548 if (irq_cfg == LIS3_IRQ1_CLICK)549 lis302dl_interrupt_handle_click(lis3);550 else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))551 lis302dl_data_ready(lis3, IRQ_LINE0);552 else553 lis3lv02d_joystick_poll(lis3->idev);554 555 return IRQ_HANDLED;556}557 558static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)559{560 struct lis3lv02d *lis3 = data;561 u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;562 563 if (irq_cfg == LIS3_IRQ2_CLICK)564 lis302dl_interrupt_handle_click(lis3);565 else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))566 lis302dl_data_ready(lis3, IRQ_LINE1);567 else568 lis3lv02d_joystick_poll(lis3->idev);569 570 return IRQ_HANDLED;571}572 573static int lis3lv02d_misc_open(struct inode *inode, struct file *file)574{575 struct lis3lv02d *lis3 = container_of(file->private_data,576 struct lis3lv02d, miscdev);577 578 if (test_and_set_bit(0, &lis3->misc_opened))579 return -EBUSY; /* already open */580 581 if (lis3->pm_dev)582 pm_runtime_get_sync(lis3->pm_dev);583 584 atomic_set(&lis3->count, 0);585 return 0;586}587 588static int lis3lv02d_misc_release(struct inode *inode, struct file *file)589{590 struct lis3lv02d *lis3 = container_of(file->private_data,591 struct lis3lv02d, miscdev);592 593 clear_bit(0, &lis3->misc_opened); /* release the device */594 if (lis3->pm_dev)595 pm_runtime_put(lis3->pm_dev);596 return 0;597}598 599static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,600 size_t count, loff_t *pos)601{602 struct lis3lv02d *lis3 = container_of(file->private_data,603 struct lis3lv02d, miscdev);604 605 DECLARE_WAITQUEUE(wait, current);606 u32 data;607 unsigned char byte_data;608 ssize_t retval = 1;609 610 if (count < 1)611 return -EINVAL;612 613 add_wait_queue(&lis3->misc_wait, &wait);614 while (true) {615 set_current_state(TASK_INTERRUPTIBLE);616 data = atomic_xchg(&lis3->count, 0);617 if (data)618 break;619 620 if (file->f_flags & O_NONBLOCK) {621 retval = -EAGAIN;622 goto out;623 }624 625 if (signal_pending(current)) {626 retval = -ERESTARTSYS;627 goto out;628 }629 630 schedule();631 }632 633 if (data < 255)634 byte_data = data;635 else636 byte_data = 255;637 638 /* make sure we are not going into copy_to_user() with639 * TASK_INTERRUPTIBLE state */640 set_current_state(TASK_RUNNING);641 if (copy_to_user(buf, &byte_data, sizeof(byte_data)))642 retval = -EFAULT;643 644out:645 __set_current_state(TASK_RUNNING);646 remove_wait_queue(&lis3->misc_wait, &wait);647 648 return retval;649}650 651static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)652{653 struct lis3lv02d *lis3 = container_of(file->private_data,654 struct lis3lv02d, miscdev);655 656 poll_wait(file, &lis3->misc_wait, wait);657 if (atomic_read(&lis3->count))658 return EPOLLIN | EPOLLRDNORM;659 return 0;660}661 662static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)663{664 struct lis3lv02d *lis3 = container_of(file->private_data,665 struct lis3lv02d, miscdev);666 667 return fasync_helper(fd, file, on, &lis3->async_queue);668}669 670static const struct file_operations lis3lv02d_misc_fops = {671 .owner = THIS_MODULE,672 .read = lis3lv02d_misc_read,673 .open = lis3lv02d_misc_open,674 .release = lis3lv02d_misc_release,675 .poll = lis3lv02d_misc_poll,676 .fasync = lis3lv02d_misc_fasync,677};678 679int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)680{681 struct input_dev *input_dev;682 int err;683 int max_val, fuzz, flat;684 int btns[] = {BTN_X, BTN_Y, BTN_Z};685 686 if (lis3->idev)687 return -EINVAL;688 689 input_dev = input_allocate_device();690 if (!input_dev)691 return -ENOMEM;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 input_dev->open = lis3lv02d_joystick_open;700 input_dev->close = lis3lv02d_joystick_close;701 702 max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;703 if (lis3->whoami == WAI_12B) {704 fuzz = LIS3_DEFAULT_FUZZ_12B;705 flat = LIS3_DEFAULT_FLAT_12B;706 } else {707 fuzz = LIS3_DEFAULT_FUZZ_8B;708 flat = LIS3_DEFAULT_FLAT_8B;709 }710 fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;711 flat = (flat * lis3->scale) / LIS3_ACCURACY;712 713 input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);714 input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);715 input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);716 717 input_set_drvdata(input_dev, lis3);718 lis3->idev = input_dev;719 720 err = input_setup_polling(input_dev, lis3lv02d_joystick_poll);721 if (err)722 goto err_free_input;723 724 input_set_poll_interval(input_dev, MDPS_POLL_INTERVAL);725 input_set_min_poll_interval(input_dev, MDPS_POLL_MIN);726 input_set_max_poll_interval(input_dev, MDPS_POLL_MAX);727 728 lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);729 lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);730 lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);731 732 err = input_register_device(lis3->idev);733 if (err)734 goto err_free_input;735 736 return 0;737 738err_free_input:739 input_free_device(input_dev);740 lis3->idev = NULL;741 return err;742 743}744EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);745 746void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)747{748 if (lis3->irq)749 free_irq(lis3->irq, lis3);750 if (lis3->pdata && lis3->pdata->irq2)751 free_irq(lis3->pdata->irq2, lis3);752 753 if (!lis3->idev)754 return;755 756 if (lis3->irq)757 misc_deregister(&lis3->miscdev);758 input_unregister_device(lis3->idev);759 lis3->idev = NULL;760}761EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);762 763/* Sysfs stuff */764static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)765{766 /*767 * SYSFS functions are fast visitors so put-call768 * immediately after the get-call. However, keep769 * chip running for a while and schedule delayed770 * suspend. This way periodic sysfs calls doesn't771 * suffer from relatively long power up time.772 */773 774 if (lis3->pm_dev) {775 pm_runtime_get_sync(lis3->pm_dev);776 pm_runtime_put_noidle(lis3->pm_dev);777 pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);778 }779}780 781static ssize_t lis3lv02d_selftest_show(struct device *dev,782 struct device_attribute *attr, char *buf)783{784 struct lis3lv02d *lis3 = dev_get_drvdata(dev);785 s16 values[3];786 787 static const char ok[] = "OK";788 static const char fail[] = "FAIL";789 static const char irq[] = "FAIL_IRQ";790 const char *res;791 792 lis3lv02d_sysfs_poweron(lis3);793 switch (lis3lv02d_selftest(lis3, values)) {794 case SELFTEST_FAIL:795 res = fail;796 break;797 case SELFTEST_IRQ:798 res = irq;799 break;800 case SELFTEST_OK:801 default:802 res = ok;803 break;804 }805 return sprintf(buf, "%s %d %d %d\n", res,806 values[0], values[1], values[2]);807}808 809static ssize_t lis3lv02d_position_show(struct device *dev,810 struct device_attribute *attr, char *buf)811{812 struct lis3lv02d *lis3 = dev_get_drvdata(dev);813 int x, y, z;814 815 lis3lv02d_sysfs_poweron(lis3);816 mutex_lock(&lis3->mutex);817 lis3lv02d_get_xyz(lis3, &x, &y, &z);818 mutex_unlock(&lis3->mutex);819 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);820}821 822static ssize_t lis3lv02d_rate_show(struct device *dev,823 struct device_attribute *attr, char *buf)824{825 struct lis3lv02d *lis3 = dev_get_drvdata(dev);826 int odr_idx;827 828 lis3lv02d_sysfs_poweron(lis3);829 830 odr_idx = lis3lv02d_get_odr_index(lis3);831 return sprintf(buf, "%d\n", lis3->odrs[odr_idx]);832}833 834static ssize_t lis3lv02d_rate_set(struct device *dev,835 struct device_attribute *attr, const char *buf,836 size_t count)837{838 struct lis3lv02d *lis3 = dev_get_drvdata(dev);839 unsigned long rate;840 int ret;841 842 ret = kstrtoul(buf, 0, &rate);843 if (ret)844 return ret;845 846 lis3lv02d_sysfs_poweron(lis3);847 if (lis3lv02d_set_odr(lis3, rate))848 return -EINVAL;849 850 return count;851}852 853static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);854static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);855static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,856 lis3lv02d_rate_set);857 858static struct attribute *lis3lv02d_attributes[] = {859 &dev_attr_selftest.attr,860 &dev_attr_position.attr,861 &dev_attr_rate.attr,862 NULL863};864 865static const struct attribute_group lis3lv02d_attribute_group = {866 .attrs = lis3lv02d_attributes867};868 869 870static int lis3lv02d_add_fs(struct lis3lv02d *lis3)871{872 lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);873 if (IS_ERR(lis3->pdev))874 return PTR_ERR(lis3->pdev);875 876 platform_set_drvdata(lis3->pdev, lis3);877 return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);878}879 880void lis3lv02d_remove_fs(struct lis3lv02d *lis3)881{882 sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);883 platform_device_unregister(lis3->pdev);884 if (lis3->pm_dev) {885 /* Barrier after the sysfs remove */886 pm_runtime_barrier(lis3->pm_dev);887 888 /* SYSFS may have left chip running. Turn off if necessary */889 if (!pm_runtime_suspended(lis3->pm_dev))890 lis3lv02d_poweroff(lis3);891 892 pm_runtime_disable(lis3->pm_dev);893 pm_runtime_set_suspended(lis3->pm_dev);894 }895 kfree(lis3->reg_cache);896}897EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);898 899static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,900 struct lis3lv02d_platform_data *p)901{902 int err;903 int ctrl2 = p->hipass_ctrl;904 905 if (p->click_flags) {906 lis3->write(lis3, CLICK_CFG, p->click_flags);907 lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);908 lis3->write(lis3, CLICK_LATENCY, p->click_latency);909 lis3->write(lis3, CLICK_WINDOW, p->click_window);910 lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);911 lis3->write(lis3, CLICK_THSY_X,912 (p->click_thresh_x & 0xf) |913 (p->click_thresh_y << 4));914 915 if (lis3->idev) {916 input_set_capability(lis3->idev, EV_KEY, BTN_X);917 input_set_capability(lis3->idev, EV_KEY, BTN_Y);918 input_set_capability(lis3->idev, EV_KEY, BTN_Z);919 }920 }921 922 if (p->wakeup_flags) {923 lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);924 lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);925 /* pdata value + 1 to keep this backward compatible*/926 lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);927 ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/928 }929 930 if (p->wakeup_flags2) {931 lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);932 lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);933 /* pdata value + 1 to keep this backward compatible*/934 lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);935 ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/936 }937 /* Configure hipass filters */938 lis3->write(lis3, CTRL_REG2, ctrl2);939 940 if (p->irq2) {941 err = request_threaded_irq(p->irq2,942 NULL,943 lis302dl_interrupt_thread2_8b,944 IRQF_TRIGGER_RISING | IRQF_ONESHOT |945 (p->irq_flags2 & IRQF_TRIGGER_MASK),946 DRIVER_NAME, lis3);947 if (err < 0)948 pr_err("No second IRQ. Limited functionality\n");949 }950}951 952#ifdef CONFIG_OF953int lis3lv02d_init_dt(struct lis3lv02d *lis3)954{955 struct lis3lv02d_platform_data *pdata;956 struct device_node *np = lis3->of_node;957 u32 val;958 s32 sval;959 960 if (!lis3->of_node)961 return 0;962 963 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);964 if (!pdata)965 return -ENOMEM;966 967 if (of_property_read_bool(np, "st,click-single-x"))968 pdata->click_flags |= LIS3_CLICK_SINGLE_X;969 if (of_property_read_bool(np, "st,click-double-x"))970 pdata->click_flags |= LIS3_CLICK_DOUBLE_X;971 972 if (of_property_read_bool(np, "st,click-single-y"))973 pdata->click_flags |= LIS3_CLICK_SINGLE_Y;974 if (of_property_read_bool(np, "st,click-double-y"))975 pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;976 977 if (of_property_read_bool(np, "st,click-single-z"))978 pdata->click_flags |= LIS3_CLICK_SINGLE_Z;979 if (of_property_read_bool(np, "st,click-double-z"))980 pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;981 982 if (!of_property_read_u32(np, "st,click-threshold-x", &val))983 pdata->click_thresh_x = val;984 if (!of_property_read_u32(np, "st,click-threshold-y", &val))985 pdata->click_thresh_y = val;986 if (!of_property_read_u32(np, "st,click-threshold-z", &val))987 pdata->click_thresh_z = val;988 989 if (!of_property_read_u32(np, "st,click-time-limit", &val))990 pdata->click_time_limit = val;991 if (!of_property_read_u32(np, "st,click-latency", &val))992 pdata->click_latency = val;993 if (!of_property_read_u32(np, "st,click-window", &val))994 pdata->click_window = val;995 996 if (of_property_read_bool(np, "st,irq1-disable"))997 pdata->irq_cfg |= LIS3_IRQ1_DISABLE;998 if (of_property_read_bool(np, "st,irq1-ff-wu-1"))999 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;1000 if (of_property_read_bool(np, "st,irq1-ff-wu-2"))1001 pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;1002 if (of_property_read_bool(np, "st,irq1-data-ready"))1003 pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;1004 if (of_property_read_bool(np, "st,irq1-click"))1005 pdata->irq_cfg |= LIS3_IRQ1_CLICK;1006 1007 if (of_property_read_bool(np, "st,irq2-disable"))1008 pdata->irq_cfg |= LIS3_IRQ2_DISABLE;1009 if (of_property_read_bool(np, "st,irq2-ff-wu-1"))1010 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;1011 if (of_property_read_bool(np, "st,irq2-ff-wu-2"))1012 pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;1013 if (of_property_read_bool(np, "st,irq2-data-ready"))1014 pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;1015 if (of_property_read_bool(np, "st,irq2-click"))1016 pdata->irq_cfg |= LIS3_IRQ2_CLICK;1017 1018 if (of_property_read_bool(np, "st,irq-open-drain"))1019 pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;1020 if (of_property_read_bool(np, "st,irq-active-low"))1021 pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;1022 1023 if (!of_property_read_u32(np, "st,wu-duration-1", &val))1024 pdata->duration1 = val;1025 if (!of_property_read_u32(np, "st,wu-duration-2", &val))1026 pdata->duration2 = val;1027 1028 if (of_property_read_bool(np, "st,wakeup-x-lo"))1029 pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;1030 if (of_property_read_bool(np, "st,wakeup-x-hi"))1031 pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;1032 if (of_property_read_bool(np, "st,wakeup-y-lo"))1033 pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;1034 if (of_property_read_bool(np, "st,wakeup-y-hi"))1035 pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;1036 if (of_property_read_bool(np, "st,wakeup-z-lo"))1037 pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;1038 if (of_property_read_bool(np, "st,wakeup-z-hi"))1039 pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;1040 if (!of_property_read_u32(np, "st,wakeup-threshold", &val))1041 pdata->wakeup_thresh = val;1042 1043 if (of_property_read_bool(np, "st,wakeup2-x-lo"))1044 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;1045 if (of_property_read_bool(np, "st,wakeup2-x-hi"))1046 pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;1047 if (of_property_read_bool(np, "st,wakeup2-y-lo"))1048 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;1049 if (of_property_read_bool(np, "st,wakeup2-y-hi"))1050 pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;1051 if (of_property_read_bool(np, "st,wakeup2-z-lo"))1052 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;1053 if (of_property_read_bool(np, "st,wakeup2-z-hi"))1054 pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;1055 if (!of_property_read_u32(np, "st,wakeup2-threshold", &val))1056 pdata->wakeup_thresh2 = val;1057 1058 if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {1059 switch (val) {1060 case 1:1061 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;1062 break;1063 case 2:1064 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;1065 break;1066 case 4:1067 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;1068 break;1069 case 8:1070 pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;1071 break;1072 }1073 }1074 1075 if (of_property_read_bool(np, "st,hipass1-disable"))1076 pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;1077 if (of_property_read_bool(np, "st,hipass2-disable"))1078 pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;1079 1080 if (of_property_read_s32(np, "st,axis-x", &sval) == 0)1081 pdata->axis_x = sval;1082 if (of_property_read_s32(np, "st,axis-y", &sval) == 0)1083 pdata->axis_y = sval;1084 if (of_property_read_s32(np, "st,axis-z", &sval) == 0)1085 pdata->axis_z = sval;1086 1087 if (of_property_read_u32(np, "st,default-rate", &val) == 0)1088 pdata->default_rate = val;1089 1090 if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)1091 pdata->st_min_limits[0] = sval;1092 if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)1093 pdata->st_min_limits[1] = sval;1094 if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)1095 pdata->st_min_limits[2] = sval;1096 1097 if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)1098 pdata->st_max_limits[0] = sval;1099 if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)1100 pdata->st_max_limits[1] = sval;1101 if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)1102 pdata->st_max_limits[2] = sval;1103 1104 1105 lis3->pdata = pdata;1106 1107 return 0;1108}1109 1110#else1111int lis3lv02d_init_dt(struct lis3lv02d *lis3)1112{1113 return 0;1114}1115#endif1116EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);1117 1118/*1119 * Initialise the accelerometer and the various subsystems.1120 * Should be rather independent of the bus system.1121 */1122int lis3lv02d_init_device(struct lis3lv02d *lis3)1123{1124 int err;1125 irq_handler_t thread_fn;1126 int irq_flags = 0;1127 1128 lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);1129 1130 switch (lis3->whoami) {1131 case WAI_12B:1132 pr_info("12 bits sensor found\n");1133 lis3->read_data = lis3lv02d_read_12;1134 lis3->mdps_max_val = 2048;1135 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;1136 lis3->odrs = lis3_12_rates;1137 lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;1138 lis3->scale = LIS3_SENSITIVITY_12B;1139 lis3->regs = lis3_wai12_regs;1140 lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);1141 break;1142 case WAI_8B:1143 pr_info("8 bits sensor found\n");1144 lis3->read_data = lis3lv02d_read_8;1145 lis3->mdps_max_val = 128;1146 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;1147 lis3->odrs = lis3_8_rates;1148 lis3->odr_mask = CTRL1_DR;1149 lis3->scale = LIS3_SENSITIVITY_8B;1150 lis3->regs = lis3_wai8_regs;1151 lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);1152 break;1153 case WAI_3DC:1154 pr_info("8 bits 3DC sensor found\n");1155 lis3->read_data = lis3lv02d_read_8;1156 lis3->mdps_max_val = 128;1157 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;1158 lis3->odrs = lis3_3dc_rates;1159 lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;1160 lis3->scale = LIS3_SENSITIVITY_8B;1161 break;1162 case WAI_3DLH:1163 pr_info("16 bits lis331dlh sensor found\n");1164 lis3->read_data = lis331dlh_read_data;1165 lis3->mdps_max_val = 2048; /* 12 bits for 2G */1166 lis3->shift_adj = SHIFT_ADJ_2G;1167 lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;1168 lis3->odrs = lis3_3dlh_rates;1169 lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;1170 lis3->scale = LIS3DLH_SENSITIVITY_2G;1171 break;1172 default:1173 pr_err("unknown sensor type 0x%X\n", lis3->whoami);1174 return -ENODEV;1175 }1176 1177 lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),1178 sizeof(lis3_wai12_regs)), GFP_KERNEL);1179 1180 if (lis3->reg_cache == NULL)1181 return -ENOMEM;1182 1183 mutex_init(&lis3->mutex);1184 atomic_set(&lis3->wake_thread, 0);1185 1186 lis3lv02d_add_fs(lis3);1187 err = lis3lv02d_poweron(lis3);1188 if (err) {1189 lis3lv02d_remove_fs(lis3);1190 return err;1191 }1192 1193 if (lis3->pm_dev) {1194 pm_runtime_set_active(lis3->pm_dev);1195 pm_runtime_enable(lis3->pm_dev);1196 }1197 1198 if (lis3lv02d_joystick_enable(lis3))1199 pr_err("joystick initialization failed\n");1200 1201 /* passing in platform specific data is purely optional and only1202 * used by the SPI transport layer at the moment */1203 if (lis3->pdata) {1204 struct lis3lv02d_platform_data *p = lis3->pdata;1205 1206 if (lis3->whoami == WAI_8B)1207 lis3lv02d_8b_configure(lis3, p);1208 1209 irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;1210 1211 lis3->irq_cfg = p->irq_cfg;1212 if (p->irq_cfg)1213 lis3->write(lis3, CTRL_REG3, p->irq_cfg);1214 1215 if (p->default_rate)1216 lis3lv02d_set_odr(lis3, p->default_rate);1217 }1218 1219 /* bail if we did not get an IRQ from the bus layer */1220 if (!lis3->irq) {1221 pr_debug("No IRQ. Disabling /dev/freefall\n");1222 goto out;1223 }1224 1225 /*1226 * The sensor can generate interrupts for free-fall and direction1227 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep1228 * the things simple and _fast_ we activate it only for free-fall, so1229 * no need to read register (very slow with ACPI). For the same reason,1230 * we forbid shared interrupts.1231 *1232 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the1233 * io-apic is not configurable (and generates a warning) but I keep it1234 * in case of support for other hardware.1235 */1236 if (lis3->pdata && lis3->whoami == WAI_8B)1237 thread_fn = lis302dl_interrupt_thread1_8b;1238 else1239 thread_fn = NULL;1240 1241 err = request_threaded_irq(lis3->irq, lis302dl_interrupt,1242 thread_fn,1243 IRQF_TRIGGER_RISING | IRQF_ONESHOT |1244 irq_flags,1245 DRIVER_NAME, lis3);1246 1247 if (err < 0) {1248 pr_err("Cannot get IRQ\n");1249 goto out;1250 }1251 1252 lis3->miscdev.minor = MISC_DYNAMIC_MINOR;1253 lis3->miscdev.name = "freefall";1254 lis3->miscdev.fops = &lis3lv02d_misc_fops;1255 1256 if (misc_register(&lis3->miscdev))1257 pr_err("misc_register failed\n");1258out:1259 return 0;1260}1261EXPORT_SYMBOL_GPL(lis3lv02d_init_device);1262 1263MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");1264MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");1265MODULE_LICENSE("GPL");1266