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/*
* STMicroelectronics lsm6ds3 trigger driver
*
* Copyright 2014 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*
* Licensed under the GPL-2.
*/
//#define WAKE_STATS_DEBUG_INFO
//#define DEBUG
#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 "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 ST_LSM6DS3_6D_SRC_DETECTED_MASK (1<<6)
static struct workqueue_struct *st_lsm6ds3_wq;
void st_lsm6ds3_flush_works()
{
flush_workqueue(st_lsm6ds3_wq);
}
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;
}
#ifdef WAKE_STATS_DEBUG_INFO
static int wakeup_irq_count = 0;
static int wakeup_irq_stayawake_count = 0;
static int wakeup_irq_keepawake_count = 0;
#define MAX_ORIENTATIONS 6
static int wake_up_orient_count[MAX_ORIENTATIONS] = {0};
static long wake_up_orient_times[MAX_ORIENTATIONS] = {0};
s64 last_orient_change_time_ns = 0;
int last_orient;
static void update_orient_stats(u8 d6d_src_reg, s64 ctime_ns)
{
return;
s64 delta = 0;
int orient_val;
d6d_src_reg &= SIXD_MASK_VALID_BITS;
orient_val = __ffs(d6d_src_reg);
if( orient_val >= MAX_ORIENTATIONS){
return;
}
wake_up_orient_count[orient_val]++;
if(last_orient_change_time_ns != 0){
delta = ctime_ns - last_orient_change_time_ns;
do_div(delta, 1E6); //down to milliseconds
wake_up_orient_times[last_orient] += delta;
}
last_orient_change_time_ns = ctime_ns;
last_orient = orient_val;
}
static void print_wake_stats(struct lsm6ds3_data *cdata)
{
struct timespec monotonic, boot, misc;
s64 mon_ns, boot_ns, misc_ns, tot_ms=0;
int i;
get_monotonic_boottime(&monotonic);
ktime_get_ts(&boot);
getnstimeofday(&misc);
mon_ns = timespec_to_ns(&monotonic);
boot_ns = timespec_to_ns(&boot);
misc_ns = timespec_to_ns(&misc);
do_div(mon_ns,1E9);
do_div(boot_ns,1E9);
do_div(misc_ns,1E9);
dev_info(cdata->dev, "wkstat: unignored/total/keepawake: \t%i\t%i\t%i", wakeup_irq_stayawake_count, wakeup_irq_count,
wakeup_irq_keepawake_count);
dev_info(cdata->dev, "wkstat times: tot:\t%lld\tawake:\t%lld", mon_ns, boot_ns);
dev_info(cdata->dev, "wkstat all orient count: 5-0 %i\t%i\t%i\t%i\t%i\t%i",
wake_up_orient_count[5],
wake_up_orient_count[4],
wake_up_orient_count[3],
wake_up_orient_count[2],
wake_up_orient_count[1],
wake_up_orient_count[0]);
for(i=0; i<MAX_ORIENTATIONS; i++)
tot_ms += wake_up_orient_times[i];
dev_info(cdata->dev, "wkstat orient times(uS): 5-0 %ld\t%ld\t%ld\t%ld\t%ld\t%ld\ttot:%lld",
wake_up_orient_times[5],
wake_up_orient_times[4],
wake_up_orient_times[3],
wake_up_orient_times[2],
wake_up_orient_times[1],
wake_up_orient_times[0], tot_ms);
}
#endif /* WAKE_STATS_DEBUG_INFO */
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 wake_irq;
int ignore_event = 0;
cdata = container_of((struct work_struct *)data_work,
struct lsm6ds3_data, data_work);
wake_irq = last_wakeup_reason_test(cdata->irq);
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 & ST_LSM6DS3_6D_SRC_DETECTED_MASK){
#ifdef WAKE_STATS_DEBUG_INFO
update_orient_stats(d6d_src_reg, cdata->timestamp);
#endif
dev_info(cdata->dev, "D6D IRQ val:0x%x mask:0x%x", SIXD_MASK_VALID_BITS & d6d_src_reg, cdata->sixd_mask);
if(cdata->sixd_mask & d6d_src_reg){
d6d_event = 1;
cdata->last_wakeup_source |= LSM6DS3_WAKEUP_6D;
}
else{
ignore_event = 1;
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(cdata->first_irq_from_resume && wake_irq){
#ifdef WAKE_STATS_DEBUG_INFO
wakeup_irq_count++;
#endif
if(!d6d_event && !tap_event && !ignore_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(!ignore_event && (tap_event || d6d_event) && cdata->first_irq_from_resume){
wake_lock_timeout(&cdata->tap_wlock,msecs_to_jiffies(1000));
#ifdef WAKE_STATS_DEBUG_INFO
wakeup_irq_stayawake_count++;
#endif
}
else if(d6d_event && !ignore_event){//negative roll
wake_lock_timeout(&cdata->tap_wlock,msecs_to_jiffies(200));
#ifdef WAKE_STATS_DEBUG_INFO
wakeup_irq_keepawake_count++;
#endif
}
//significant motion event processing
if(tap_event){
dev_info(cdata->dev, "Sending sig mot event(tap); ready:%i",cdata->sign_motion_event_ready);
st_lsm6ds3_push_tap_to_fifo(cdata);
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_fifo & ST_LSM6DS3_FIFO_DATA_AVL) {
st_lsm6ds3_read_fifo(cdata, true, true);
}
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);
}
mutex_unlock(&cdata->fifo_lock);
if(cdata->first_irq_from_resume){
cdata->first_irq_from_resume = 0;
st_lsm6ds3_reconfigure_fifo(cdata, false);
#ifdef WAKE_STATS_DEBUG_INFO
print_wake_stats(cdata);
#endif
}
enable_irq(cdata->irq);
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);
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_HIGH, 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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