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iio: bmi323: peripheral in lowest power state on suspend

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The bmi323 is mounted on some devices that are powered
by an internal battery: help in reducing system overall power drain
while the system is in s2idle or the imu driver is not loaded
by resetting it in its lowest power draining state.

Signed-off-by: Denis Benato <benato.denis96@gmail.com>
Link: https://patch.msgid.link/20240824141122.334620-2-benato.denis96@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Denis Benato 2024-08-24 16:11:22 +02:00 committed by Jonathan Cameron
parent 525e9cd5ac
commit 16531118ba
1 changed files with 159 additions and 2 deletions
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161
drivers/iio/imu/bmi323/bmi323_core.c
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@ -118,6 +118,38 @@ static const struct bmi323_hw bmi323_hw[2] = {
},
};
static const unsigned int bmi323_reg_savestate[] = {
BMI323_INT_MAP1_REG,
BMI323_INT_MAP2_REG,
BMI323_IO_INT_CTR_REG,
BMI323_IO_INT_CONF_REG,
BMI323_ACC_CONF_REG,
BMI323_GYRO_CONF_REG,
BMI323_FEAT_IO0_REG,
BMI323_FIFO_WTRMRK_REG,
BMI323_FIFO_CONF_REG
};
static const unsigned int bmi323_ext_reg_savestate[] = {
BMI323_GEN_SET1_REG,
BMI323_TAP1_REG,
BMI323_TAP2_REG,
BMI323_TAP3_REG,
BMI323_FEAT_IO0_S_TAP_MSK,
BMI323_STEP_SC1_REG,
BMI323_ANYMO1_REG,
BMI323_NOMO1_REG,
BMI323_ANYMO1_REG + BMI323_MO2_OFFSET,
BMI323_NOMO1_REG + BMI323_MO2_OFFSET,
BMI323_ANYMO1_REG + BMI323_MO3_OFFSET,
BMI323_NOMO1_REG + BMI323_MO3_OFFSET
};
struct bmi323_regs_runtime_pm {
unsigned int reg_settings[ARRAY_SIZE(bmi323_reg_savestate)];
unsigned int ext_reg_settings[ARRAY_SIZE(bmi323_ext_reg_savestate)];
};
struct bmi323_data {
struct device *dev;
struct regmap *regmap;
@ -130,6 +162,7 @@ struct bmi323_data {
u32 odrns[BMI323_SENSORS_CNT];
u32 odrhz[BMI323_SENSORS_CNT];
unsigned int feature_events;
struct bmi323_regs_runtime_pm runtime_pm_status;
/*
* Lock to protect the members of device's private data from concurrent
@ -1972,6 +2005,11 @@ static void bmi323_disable(void *data_ptr)
bmi323_set_mode(data, BMI323_ACCEL, ACC_GYRO_MODE_DISABLE);
bmi323_set_mode(data, BMI323_GYRO, ACC_GYRO_MODE_DISABLE);
/*
* Place the peripheral in its lowest power consuming state.
*/
regmap_write(data->regmap, BMI323_CMD_REG, BMI323_RST_VAL);
}
static int bmi323_set_bw(struct bmi323_data *data,
@ -2030,6 +2068,13 @@ static int bmi323_init(struct bmi323_data *data)
return dev_err_probe(data->dev, -EINVAL,
"Sensor power error = 0x%x\n", val);
return 0;
}
static int bmi323_init_reset(struct bmi323_data *data)
{
int ret;
/*
* Set the Bandwidth coefficient which defines the 3 dB cutoff
* frequency in relation to the ODR.
@ -2078,12 +2123,18 @@ int bmi323_core_probe(struct device *dev)
data = iio_priv(indio_dev);
data->dev = dev;
data->regmap = regmap;
data->irq_pin = BMI323_IRQ_DISABLED;
data->state = BMI323_IDLE;
mutex_init(&data->mutex);
ret = bmi323_init(data);
if (ret)
return -EINVAL;
ret = bmi323_init_reset(data);
if (ret)
return -EINVAL;
if (!iio_read_acpi_mount_matrix(dev, &data->orientation, "ROTM")) {
ret = iio_read_mount_matrix(dev, &data->orientation);
if (ret)
@ -2117,7 +2168,7 @@ int bmi323_core_probe(struct device *dev)
return dev_err_probe(data->dev, ret,
"Unable to register iio device\n");
return 0;
return bmi323_fifo_disable(data);
}
EXPORT_SYMBOL_NS_GPL(bmi323_core_probe, IIO_BMI323);
@ -2125,13 +2176,119 @@ EXPORT_SYMBOL_NS_GPL(bmi323_core_probe, IIO_BMI323);
static int bmi323_core_runtime_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmi323_data *data = iio_priv(indio_dev);
struct bmi323_regs_runtime_pm *savestate = &data->runtime_pm_status;
int ret;
return iio_device_suspend_triggering(indio_dev);
guard(mutex)(&data->mutex);
ret = iio_device_suspend_triggering(indio_dev);
if (ret)
return ret;
/* Save registers meant to be restored by resume pm callback. */
for (unsigned int i = 0; i < ARRAY_SIZE(bmi323_reg_savestate); i++) {
ret = regmap_read(data->regmap, bmi323_reg_savestate[i],
&savestate->reg_settings[i]);
if (ret) {
dev_err(data->dev,
"Error reading bmi323 reg 0x%x: %d\n",
bmi323_reg_savestate[i], ret);
return ret;
}
}
for (unsigned int i = 0; i < ARRAY_SIZE(bmi323_ext_reg_savestate); i++) {
ret = bmi323_read_ext_reg(data, bmi323_reg_savestate[i],
&savestate->reg_settings[i]);
if (ret) {
dev_err(data->dev,
"Error reading bmi323 external reg 0x%x: %d\n",
bmi323_reg_savestate[i], ret);
return ret;
}
}
/* Perform soft reset to place the device in its lowest power state. */
ret = regmap_write(data->regmap, BMI323_CMD_REG, BMI323_RST_VAL);
if (ret)
return ret;
return 0;
}
static int bmi323_core_runtime_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct bmi323_data *data = iio_priv(indio_dev);
struct bmi323_regs_runtime_pm *savestate = &data->runtime_pm_status;
unsigned int val;
int ret;
guard(mutex)(&data->mutex);
/*
* Perform the device power-on and initial setup once again
* after being reset in the lower power state by runtime-pm.
*/
ret = bmi323_init(data);
if (!ret)
return ret;
/* Register must be cleared before changing an active config */
ret = regmap_write(data->regmap, BMI323_FEAT_IO0_REG, 0);
if (ret) {
dev_err(data->dev, "Error stopping feature engine\n");
return ret;
}
for (unsigned int i = 0; i < ARRAY_SIZE(bmi323_ext_reg_savestate); i++) {
ret = bmi323_write_ext_reg(data, bmi323_reg_savestate[i],
savestate->reg_settings[i]);
if (ret) {
dev_err(data->dev,
"Error writing bmi323 external reg 0x%x: %d\n",
bmi323_reg_savestate[i], ret);
return ret;
}
}
for (unsigned int i = 0; i < ARRAY_SIZE(bmi323_reg_savestate); i++) {
ret = regmap_write(data->regmap, bmi323_reg_savestate[i],
savestate->reg_settings[i]);
if (ret) {
dev_err(data->dev,
"Error writing bmi323 reg 0x%x: %d\n",
bmi323_reg_savestate[i], ret);
return ret;
}
}
/*
* Clear old FIFO samples that might be generated before suspend
* or generated from a peripheral state not equal to the saved one.
*/
if (data->state == BMI323_BUFFER_FIFO) {
ret = regmap_write(data->regmap, BMI323_FIFO_CTRL_REG,
BMI323_FIFO_FLUSH_MSK);
if (ret) {
dev_err(data->dev, "Error flushing FIFO buffer: %d\n", ret);
return ret;
}
}
ret = regmap_read(data->regmap, BMI323_ERR_REG, &val);
if (ret) {
dev_err(data->dev,
"Error reading bmi323 error register: %d\n", ret);
return ret;
}
if (val) {
dev_err(data->dev,
"Sensor power error in PM = 0x%x\n", val);
return -EINVAL;
}
return iio_device_resume_triggering(indio_dev);
}