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Message-Id: <20250622155010.164451-7-l.rubusch@gmail.com>
Date: Sun, 22 Jun 2025 15:50:09 +0000
From: Lothar Rubusch <l.rubusch@...il.com>
To: lars@...afoo.de,
Michael.Hennerich@...log.com,
jic23@...nel.org,
dlechner@...libre.com,
nuno.sa@...log.com,
andy@...nel.org,
corbet@....net
Cc: linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org,
eraretuya@...il.com,
l.rubusch@...il.com
Subject: [PATCH v10 6/7] iio: accel: adxl345: extend inactivity time for less than 1s
Inactivity and free-fall events are essentially the same type of sensor
events. Therefore, inactivity detection (normally set for periods between 1
and 255 seconds) can be extended for shorter durations to support free-fall
detection.
For periods shorter than 1 second, the driver automatically configures the
threshold and duration using the free-fall register. For periods longer
than 1 second, it uses the inactivity threshold and duration using the
inactivity registers.
When using the free-fall register, the link bit is not set, which means
auto-sleep cannot be enabled if activity detection is also active.
Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
---
drivers/iio/accel/adxl345_core.c | 158 +++++++++++++++++++++----------
1 file changed, 109 insertions(+), 49 deletions(-)
diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
index c5a3dac5f938..f1f92635bc21 100644
--- a/drivers/iio/accel/adxl345_core.c
+++ b/drivers/iio/accel/adxl345_core.c
@@ -40,12 +40,15 @@
#define ADXL345_REG_INACT_AXIS_MSK GENMASK(2, 0)
#define ADXL345_REG_ACT_ACDC_MSK BIT(7)
#define ADXL345_REG_INACT_ACDC_MSK BIT(3)
+#define ADXL345_REG_NO_ACDC_MSK 0x00
#define ADXL345_POWER_CTL_INACT_MSK (ADXL345_POWER_CTL_AUTO_SLEEP | ADXL345_POWER_CTL_LINK)
#define ADXL345_TAP_Z_EN BIT(0)
#define ADXL345_TAP_Y_EN BIT(1)
#define ADXL345_TAP_X_EN BIT(2)
+#define ADXL345_ACT_INACT_NO_AXIS_EN 0x00
+
#define ADXL345_INACT_Z_EN BIT(0)
#define ADXL345_INACT_Y_EN BIT(1)
#define ADXL345_INACT_X_EN BIT(2)
@@ -86,6 +89,7 @@ enum adxl345_activity_type {
ADXL345_INACTIVITY,
ADXL345_ACTIVITY_AC,
ADXL345_INACTIVITY_AC,
+ ADXL345_INACTIVITY_FF,
};
static const unsigned int adxl345_act_int_reg[] = {
@@ -93,6 +97,7 @@ static const unsigned int adxl345_act_int_reg[] = {
[ADXL345_INACTIVITY] = ADXL345_INT_INACTIVITY,
[ADXL345_ACTIVITY_AC] = ADXL345_INT_ACTIVITY,
[ADXL345_INACTIVITY_AC] = ADXL345_INT_INACTIVITY,
+ [ADXL345_INACTIVITY_FF] = ADXL345_INT_FREE_FALL,
};
static const unsigned int adxl345_act_thresh_reg[] = {
@@ -100,6 +105,7 @@ static const unsigned int adxl345_act_thresh_reg[] = {
[ADXL345_INACTIVITY] = ADXL345_REG_THRESH_INACT,
[ADXL345_ACTIVITY_AC] = ADXL345_REG_THRESH_ACT,
[ADXL345_INACTIVITY_AC] = ADXL345_REG_THRESH_INACT,
+ [ADXL345_INACTIVITY_FF] = ADXL345_REG_THRESH_FF,
};
static const unsigned int adxl345_act_acdc_msk[] = {
@@ -107,6 +113,7 @@ static const unsigned int adxl345_act_acdc_msk[] = {
[ADXL345_INACTIVITY] = ADXL345_REG_INACT_ACDC_MSK,
[ADXL345_ACTIVITY_AC] = ADXL345_REG_ACT_ACDC_MSK,
[ADXL345_INACTIVITY_AC] = ADXL345_REG_INACT_ACDC_MSK,
+ [ADXL345_INACTIVITY_FF] = ADXL345_REG_NO_ACDC_MSK,
};
enum adxl345_odr {
@@ -189,6 +196,9 @@ struct adxl345_state {
u8 watermark;
u8 fifo_mode;
+ u8 inact_threshold;
+ u32 inact_time_ms;
+
u32 tap_duration_us;
u32 tap_latent_us;
u32 tap_window_us;
@@ -333,10 +343,29 @@ static int adxl345_set_measure_en(struct adxl345_state *st, bool en)
/* activity / inactivity */
+static int adxl345_set_inact_threshold(struct adxl345_state *st,
+ unsigned int threshold)
+{
+ int ret;
+
+ st->inact_threshold = min(U8_MAX, threshold);
+
+ ret = regmap_write(st->regmap,
+ adxl345_act_thresh_reg[ADXL345_INACTIVITY],
+ st->inact_threshold);
+ if (ret)
+ return ret;
+
+ return regmap_write(st->regmap,
+ adxl345_act_thresh_reg[ADXL345_INACTIVITY_FF],
+ st->inact_threshold);
+}
+
/**
* adxl345_set_inact_time - Configure inactivity time explicitly or by ODR.
* @st: The sensor state instance.
- * @val_s: A desired time value, between 0 and 255.
+ * @val_int: The inactivity time, integer part.
+ * @val_fract: The inactivity time, fractional part when val_int is 0.
*
* Inactivity time can be configured between 1 and 255 seconds. If a user sets
* val_s to 0, a default inactivity time is calculated automatically (since 0 is
@@ -357,16 +386,18 @@ static int adxl345_set_measure_en(struct adxl345_state *st, bool en)
*
* Return: 0 or error value.
*/
-static int adxl345_set_inact_time(struct adxl345_state *st, u32 val_s)
+static int adxl345_set_inact_time(struct adxl345_state *st, u32 val_int,
+ u32 val_fract)
{
int max_boundary = U8_MAX;
int min_boundary = 10;
- unsigned int val = min(val_s, U8_MAX);
+ unsigned int val;
enum adxl345_odr odr;
unsigned int regval;
int ret;
- if (val == 0) {
+ if (val_int == 0 && val_fract == 0) {
+ /* Generated inactivity time based on ODR */
ret = regmap_read(st->regmap, ADXL345_REG_BW_RATE, ®val);
if (ret)
return ret;
@@ -374,9 +405,31 @@ static int adxl345_set_inact_time(struct adxl345_state *st, u32 val_s)
odr = FIELD_GET(ADXL345_BW_RATE_MSK, regval);
val = clamp(max_boundary - adxl345_odr_tbl[odr][0],
min_boundary, max_boundary);
+ st->inact_time_ms = MILLI * val;
+
+ /* Inactivity time in s */
+ return regmap_write(st->regmap, ADXL345_REG_TIME_INACT, val);
+ } else if (val_int == 0 && val_fract > 0) {
+ /* time < 1s, free-fall */
+
+ /*
+ * Datasheet max. value is 255 * 5000 us = 1.275000 seconds.
+ *
+ * Recommended values between 100ms and 350ms (0x14 to 0x46)
+ */
+ st->inact_time_ms = DIV_ROUND_UP(val_fract, MILLI);
+
+ return regmap_write(st->regmap, ADXL345_REG_TIME_FF,
+ DIV_ROUND_CLOSEST(val_fract, 5));
+ } else if (val_int > 0) {
+ /* Time >= 1s, inactivity */
+ st->inact_time_ms = MILLI * val_int;
+
+ return regmap_write(st->regmap, ADXL345_REG_TIME_INACT, val_int);
}
- return regmap_write(st->regmap, ADXL345_REG_TIME_INACT, val);
+ /* Do not support negative or wrong input. */
+ return -EINVAL;
}
/**
@@ -399,6 +452,9 @@ static int adxl345_is_act_inact_ac(struct adxl345_state *st,
bool coupling;
int ret;
+ if (type == ADXL345_INACTIVITY_FF)
+ return true;
+
ret = regmap_read(st->regmap, ADXL345_REG_ACT_INACT_CTRL, ®val);
if (ret)
return ret;
@@ -511,6 +567,9 @@ static int adxl345_is_act_inact_en(struct adxl345_state *st,
if (!en)
return false;
break;
+ case ADXL345_INACTIVITY_FF:
+ en = true;
+ break;
default:
return -EINVAL;
}
@@ -542,15 +601,20 @@ static int adxl345_set_act_inact_linkbit(struct adxl345_state *st,
if (act_ac_en < 0)
return act_ac_en;
- inact_en = adxl345_is_act_inact_en(st, ADXL345_INACTIVITY);
- if (inact_en < 0)
- return inact_en;
+ if (type == ADXL345_INACTIVITY_FF) {
+ inact_en = false;
+ } else {
+ inact_en = adxl345_is_act_inact_en(st, ADXL345_INACTIVITY);
+ if (inact_en < 0)
+ return inact_en;
- inact_ac_en = adxl345_is_act_inact_en(st, ADXL345_INACTIVITY_AC);
- if (inact_ac_en < 0)
- return inact_ac_en;
+ inact_ac_en = adxl345_is_act_inact_en(st, ADXL345_INACTIVITY_AC);
+ if (inact_ac_en < 0)
+ return inact_ac_en;
+
+ inact_en = inact_en || inact_ac_en;
+ }
- inact_en = inact_en || inact_ac_en;
act_en = act_en || act_ac_en;
return regmap_assign_bits(st->regmap, ADXL345_REG_POWER_CTL,
@@ -569,11 +633,15 @@ static int adxl345_set_act_inact_en(struct adxl345_state *st,
if (cmd_en) {
/* When turning on, check if threshold is valid */
- ret = regmap_read(st->regmap,
- adxl345_act_thresh_reg[type],
- &threshold);
- if (ret)
- return ret;
+ if (type == ADXL345_ACTIVITY || type == ADXL345_ACTIVITY_AC) {
+ ret = regmap_read(st->regmap,
+ adxl345_act_thresh_reg[type],
+ &threshold);
+ if (ret)
+ return ret;
+ } else {
+ threshold = st->inact_threshold;
+ }
if (!threshold) /* Just ignore the command if threshold is 0 */
return 0;
@@ -618,6 +686,9 @@ static int adxl345_set_act_inact_en(struct adxl345_state *st,
axis_ctrl = ADXL345_INACT_X_EN | ADXL345_INACT_Y_EN |
ADXL345_INACT_Z_EN;
break;
+ case ADXL345_INACTIVITY_FF:
+ axis_ctrl = ADXL345_ACT_INACT_NO_AXIS_EN;
+ break;
default:
return -EINVAL;
}
@@ -884,7 +955,7 @@ static int adxl345_set_odr(struct adxl345_state *st, enum adxl345_odr odr)
return ret;
/* update inactivity time by ODR */
- return adxl345_set_inact_time(st, 0);
+ return adxl345_set_inact_time(st, 0, 0);
}
static int adxl345_find_range(struct adxl345_state *st, int val, int val2,
@@ -921,12 +992,6 @@ static int adxl345_set_range(struct adxl345_state *st, enum adxl345_range range)
if (ret)
return ret;
- ret = regmap_read(st->regmap,
- adxl345_act_thresh_reg[ADXL345_INACTIVITY],
- &inact_threshold);
- if (ret)
- return ret;
-
ret = regmap_update_bits(st->regmap, ADXL345_REG_DATA_FORMAT,
ADXL345_DATA_FORMAT_RANGE,
FIELD_PREP(ADXL345_DATA_FORMAT_RANGE, range));
@@ -937,6 +1002,7 @@ static int adxl345_set_range(struct adxl345_state *st, enum adxl345_range range)
/ adxl345_range_factor_tbl[range];
act_threshold = min(U8_MAX, max(1, act_threshold));
+ inact_threshold = st->inact_threshold;
inact_threshold = inact_threshold * adxl345_range_factor_tbl[range_old]
/ adxl345_range_factor_tbl[range];
inact_threshold = min(U8_MAX, max(1, inact_threshold));
@@ -946,8 +1012,7 @@ static int adxl345_set_range(struct adxl345_state *st, enum adxl345_range range)
if (ret)
return ret;
- return regmap_write(st->regmap, adxl345_act_thresh_reg[ADXL345_INACTIVITY],
- inact_threshold);
+ return adxl345_set_inact_threshold(st, inact_threshold);
}
static int adxl345_read_avail(struct iio_dev *indio_dev,
@@ -1192,7 +1257,6 @@ static int adxl345_read_mag_value(struct adxl345_state *st,
int *val, int *val2)
{
unsigned int threshold;
- unsigned int period;
int ret;
switch (info) {
@@ -1208,25 +1272,16 @@ static int adxl345_read_mag_value(struct adxl345_state *st,
*val2 = MICRO;
return IIO_VAL_FRACTIONAL;
case IIO_EV_DIR_FALLING:
- ret = regmap_read(st->regmap,
- adxl345_act_thresh_reg[type_inact],
- &threshold);
- if (ret)
- return ret;
- *val = 62500 * threshold;
+ *val = 62500 * st->inact_threshold;
*val2 = MICRO;
return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
case IIO_EV_INFO_PERIOD:
- ret = regmap_read(st->regmap,
- ADXL345_REG_TIME_INACT,
- &period);
- if (ret)
- return ret;
- *val = period;
- return IIO_VAL_INT;
+ *val = st->inact_time_ms;
+ *val2 = MILLI;
+ return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
@@ -1249,14 +1304,12 @@ static int adxl345_write_mag_value(struct adxl345_state *st,
adxl345_act_thresh_reg[type_act],
val);
case IIO_EV_DIR_FALLING:
- return regmap_write(st->regmap,
- adxl345_act_thresh_reg[type_inact],
- val);
+ return adxl345_set_inact_threshold(st, val);
default:
return -EINVAL;
}
case IIO_EV_INFO_PERIOD:
- return adxl345_set_inact_time(st, val);
+ return adxl345_set_inact_time(st, val, val2);
default:
return -EINVAL;
}
@@ -1669,6 +1722,17 @@ static int adxl345_push_event(struct iio_dev *indio_dev, int int_stat,
return ret;
}
+ if (FIELD_GET(ADXL345_INT_FREE_FALL, int_stat)) {
+ ret = iio_push_event(indio_dev,
+ IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
+ IIO_MOD_X_AND_Y_AND_Z,
+ IIO_EV_TYPE_MAG,
+ IIO_EV_DIR_FALLING),
+ ts);
+ if (ret)
+ return ret;
+ }
+
if (FIELD_GET(ADXL345_INT_WATERMARK, int_stat)) {
samples = adxl345_get_samples(st);
if (samples < 0)
@@ -1907,15 +1971,11 @@ int adxl345_core_probe(struct device *dev, struct regmap *regmap,
if (ret)
return ret;
- ret = regmap_write(st->regmap, ADXL345_REG_TIME_INACT, 0x37);
- if (ret)
- return ret;
-
ret = regmap_write(st->regmap, ADXL345_REG_THRESH_ACT, 6);
if (ret)
return ret;
- ret = regmap_write(st->regmap, ADXL345_REG_THRESH_INACT, 4);
+ ret = adxl345_set_inact_threshold(st, 4);
if (ret)
return ret;
--
2.39.5
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