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/*
* STMicroelectronics lsm6ds3 trigger driver
*
* Copyright 2014 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*
* Licensed under the GPL-2.
*/
#define DEBUG //TODO: remove
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/interrupt.h>
#include <linux/iio/events.h>
#include <linux/wakelock.h>
#include <linux/wakeup_reason.h>
#include <linux/kfifo.h>
#include "st_lsm6ds3.h"
#define ST_LSM6DS3_SRC_FUNC_ADDR 0x53
#define ST_LSM6DS3_FIFO_DATA_AVL_ADDR 0x3b
#define ST_LSM6DS3_SRC_STEP_DETECTOR_DATA_AVL 0x10
#define ST_LSM6DS3_SRC_TILT_DATA_AVL 0x20
#define ST_LSM6DS3_SRC_STEP_COUNTER_DATA_AVL 0x80
#define ST_LSM6DS3_FIFO_DATA_AVL 0x80
#define ST_LSM6DS3_FIFO_DATA_OVR 0x40
#define ST_LSM6DS3_TAP_SRC_ADDR 0x1c
#define ST_LSM6DS3_TAP_SRC_DETECTED_MASK (1<<6)
#define ST_LSM6DS3_TAP_SRC_SINGLE_TAP_MASK (1<<5)
#define ST_LSM6DS3_TAP_SRC_Z_AXIS_MASK (1<<0)
#define ST_LSM6DS3_6D_SRC_ADDR 0x1d
#define WAKE_LOG_EVENTS 8 //must be power of 2 for kfifo
static DECLARE_KFIFO(wake_time_fifo, s64, WAKE_LOG_EVENTS);
#define HYPERACTIVITY_WINDOW_NS 5000000000L
static struct workqueue_struct *st_lsm6ds3_wq;
void st_lsm6ds3_flush_works()
{
flush_workqueue(st_lsm6ds3_wq);
}
int hyperactivity_check(struct lsm6ds3_data *cdata)
{
int i, fifo_len;
int recent_count = 0;
struct timespec ts;
s64 ctime;
s64 wtime[WAKE_LOG_EVENTS] = {0};
get_monotonic_boottime(&ts);
ctime = timespec_to_ns(&ts);
fifo_len = kfifo_len(&wake_time_fifo);
dev_dbg(cdata->dev, "HYP_CHECK FIFO_LEN: %i/%i, time:%lld", fifo_len, kfifo_size(&wake_time_fifo), ctime);
if(fifo_len < WAKE_LOG_EVENTS)
return 0;
kfifo_out(&wake_time_fifo, wtime, WAKE_LOG_EVENTS);
for(i=0; i < WAKE_LOG_EVENTS; i++){
dev_dbg(cdata->dev, "wtime[%i]:%lld", i, wtime[i]);
if(ctime - wtime[i] < HYPERACTIVITY_WINDOW_NS){
recent_count++;
kfifo_in(&wake_time_fifo, &wtime[i], 1);
}
}
dev_dbg(cdata->dev, "recent count:%i", recent_count);
return (recent_count == WAKE_LOG_EVENTS);
}
irqreturn_t st_lsm6ds3_save_timestamp(int irq, void *private)
{
struct timespec ts;
struct lsm6ds3_data *cdata = private;
get_monotonic_boottime(&ts);
cdata->timestamp = timespec_to_ns(&ts);
cdata->accel_timestamp = cdata->timestamp;
queue_work(st_lsm6ds3_wq, &cdata->data_work);
disable_irq_nosync(irq);
return IRQ_HANDLED;
}
static void st_lsm6ds3_irq_management(struct work_struct *data_work)
{
struct lsm6ds3_data *cdata;
u8 d6d_src_reg, tap_src_reg;
u8 src_value = 0x00, src_fifo = 0x00;
u8 d6d_event = 0;
u8 tap_event = 0;
int woken_from_sleep = 0;
int hyperactive = 0;
cdata = container_of((struct work_struct *)data_work,
struct lsm6ds3_data, data_work);
if(cdata->first_irq_from_resume && last_wakeup_reason_test(cdata->irq)){
//take_wake_lock to give app enough time from wakeup
woken_from_sleep = 1;
wake_lock_timeout(&cdata->wlock,msecs_to_jiffies(1000));
}
mutex_lock(&cdata->fifo_lock);
cdata->tf->read(cdata, ST_LSM6DS3_6D_SRC_ADDR, 1, &d6d_src_reg, true);
cdata->tf->read(cdata, ST_LSM6DS3_TAP_SRC_ADDR, 1, &tap_src_reg, true);
cdata->tf->read(cdata, ST_LSM6DS3_SRC_FUNC_ADDR, 1, &src_value, true);
cdata->tf->read(cdata, ST_LSM6DS3_FIFO_DATA_AVL_ADDR, 1,
&src_fifo, true);
dev_dbg(cdata->dev, "ST irq start :src_value, 6d, tap:%x %x %x",src_value, d6d_src_reg, tap_src_reg);
if(d6d_src_reg & (1<<6)){
dev_info(cdata->dev, "D6D IRQ");
if(cdata->sixd_mask & d6d_src_reg){
d6d_event = 1;
cdata->last_wakeup_source |= LSM6DS3_WAKEUP_6D;
}
else{
dev_info(cdata->dev, "ignoring 6d interrupt, wrong axis. mask: 0x%x", cdata->sixd_mask);
}
}
if(tap_src_reg & ST_LSM6DS3_TAP_SRC_DETECTED_MASK){
dev_info(cdata->dev, "TAP IRQ");
if(tap_src_reg & (ST_LSM6DS3_TAP_SRC_SINGLE_TAP_MASK | ST_LSM6DS3_TAP_SRC_Z_AXIS_MASK)){
tap_event = 1;
cdata->last_wakeup_source |= LSM6DS3_WAKEUP_TAP;
dev_info(cdata->dev, "Valid Tap");
}
else {
dev_info(cdata->dev, "Ignoring tap");
}
}
if(woken_from_sleep){
dev_info(cdata->dev, "First IRQ from a RESUME");
if(!d6d_event && !tap_event){
dev_info(cdata->dev, "No event from first resume, assuming lost TAP");
tap_event = 1;
cdata->last_wakeup_source |= LSM6DS3_WAKEUP_TAP;
dev_info(cdata->dev, "Valid Tap from sleep");
}
}
if (src_fifo & ST_LSM6DS3_FIFO_DATA_AVL) {
if(cdata->first_irq_from_resume){
st_lsm6ds3_read_fifo(cdata, true, true);
}
else{
st_lsm6ds3_read_fifo(cdata, true, true);
}
}
//significant motion event processing
if(!cdata->inactive_wait && (d6d_event || tap_event)){
kfifo_in(&wake_time_fifo, &cdata->timestamp, 1);
hyperactive = hyperactivity_check(cdata);
dev_info(cdata->dev, "Sending sig mot event; ready:%i",cdata->sign_motion_event_ready);
wake_lock_timeout(&cdata->tap_wlock,msecs_to_jiffies(1500));
iio_push_event(cdata->indio_dev[
ST_INDIO_DEV_SIGN_MOTION],
IIO_UNMOD_EVENT_CODE(IIO_SIGN_MOTION,
0, IIO_EV_TYPE_THRESH, IIO_EV_DIR_EITHER),
cdata->accel_timestamp);
cdata->sign_motion_event_ready = false;
}
if (src_value & ST_LSM6DS3_SRC_STEP_DETECTOR_DATA_AVL) {
iio_push_event(cdata->indio_dev[ST_INDIO_DEV_STEP_DETECTOR],
IIO_UNMOD_EVENT_CODE(IIO_STEP_DETECTOR,
0, IIO_EV_TYPE_THRESH, IIO_EV_DIR_EITHER),
cdata->timestamp);
if (cdata->sign_motion_event_ready) {
dev_info(cdata->dev, "significant motion irq, pushing event (disable this?)");
iio_push_event(cdata->indio_dev[
ST_INDIO_DEV_SIGN_MOTION],
IIO_UNMOD_EVENT_CODE(IIO_SIGN_MOTION,
0, IIO_EV_TYPE_THRESH, IIO_EV_DIR_EITHER),
cdata->timestamp);
cdata->sign_motion_event_ready = false;
}
}
if (src_value & ST_LSM6DS3_SRC_STEP_COUNTER_DATA_AVL) {
iio_trigger_poll_chained(
cdata->trig[ST_INDIO_DEV_STEP_COUNTER], 0);
}
if (src_value & ST_LSM6DS3_SRC_TILT_DATA_AVL) {
iio_push_event(cdata->indio_dev[ST_INDIO_DEV_TILT],
IIO_UNMOD_EVENT_CODE(IIO_TILT,
0, IIO_EV_TYPE_THRESH, IIO_EV_DIR_EITHER),
cdata->timestamp);
}
if(hyperactive){
uint8_t reg_value;
int err;
dev_info(cdata->dev, "Hyperactivity triggered, masking irqs except inactivity and fifo");
cdata->inactive_wait = 1;
reg_value = 0x80;//fifo is in another register
err = cdata->tf->write(cdata,
0x5e, 1, ®_value, true);
st_lsm6ds3_set_inactive_detection(cdata, 1);
}
enable_irq(cdata->irq);
mutex_unlock(&cdata->fifo_lock);
cdata->first_irq_from_resume = 0;
return;
}
int st_lsm6ds3_allocate_triggers(struct lsm6ds3_data *cdata,
const struct iio_trigger_ops *trigger_ops)
{
int err, i, n;
if (!st_lsm6ds3_wq)
st_lsm6ds3_wq = create_workqueue(cdata->name);
if (!st_lsm6ds3_wq)
return -EINVAL;
INIT_WORK(&cdata->data_work, st_lsm6ds3_irq_management);
INIT_KFIFO(wake_time_fifo);
for (i = 0; i < ST_INDIO_DEV_NUM; i++) {
cdata->trig[i] = iio_trigger_alloc("%s-trigger",
cdata->indio_dev[i]->name);
if (!cdata->trig[i]) {
dev_err(cdata->dev,
"failed to allocate iio trigger.\n");
err = -ENOMEM;
goto deallocate_trigger;
}
iio_trigger_set_drvdata(cdata->trig[i], cdata->indio_dev[i]);
cdata->trig[i]->ops = trigger_ops;
cdata->trig[i]->dev.parent = cdata->dev;
}
err = request_threaded_irq(cdata->irq, st_lsm6ds3_save_timestamp, NULL,
IRQF_TRIGGER_RISING, cdata->name, cdata);
if (err)
goto deallocate_trigger;
for (n = 0; n < ST_INDIO_DEV_NUM; n++) {
err = iio_trigger_register(cdata->trig[n]);
if (err < 0) {
dev_err(cdata->dev,
"failed to register iio trigger.\n");
goto free_irq;
}
cdata->indio_dev[n]->trig = cdata->trig[n];
}
return 0;
free_irq:
free_irq(cdata->irq, cdata);
for (n--; n >= 0; n--)
iio_trigger_unregister(cdata->trig[n]);
deallocate_trigger:
for (i--; i >= 0; i--)
iio_trigger_free(cdata->trig[i]);
return err;
}
EXPORT_SYMBOL(st_lsm6ds3_allocate_triggers);
void st_lsm6ds3_deallocate_triggers(struct lsm6ds3_data *cdata)
{
int i;
free_irq(cdata->irq, cdata);
for (i = 0; i < ST_INDIO_DEV_NUM; i++)
iio_trigger_unregister(cdata->trig[i]);
}
EXPORT_SYMBOL(st_lsm6ds3_deallocate_triggers);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics lsm6ds3 trigger driver");
MODULE_LICENSE("GPL v2");
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