Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
iio: imu: bmi270: add temperature channel
The BMI270 IMU includes a temperature sensor. Add a channel for reading
the temperature.
Signed-off-by: Gustavo Silva <gustavograzs@gmail.com>
Link: https://patch.msgid.link/20250118-bmi270-temp-v2-1-50bc85f36ab2@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
authored by
Gustavo Silva
and committed by
Jonathan Cameron
7ecbbb5b
d438fc93
+43
-5
+43
-5
drivers/iio/imu/bmi270/bmi270_core.c
+43
-5
drivers/iio/imu/bmi270/bmi270_core.c
···
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/units.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
···
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#define BMI270_INTERNAL_STATUS_REG 0x21
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#define BMI270_INTERNAL_STATUS_MSG_MSK GENMASK(3, 0)
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#define BMI270_INTERNAL_STATUS_MSG_INIT_OK 0x01
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#define BMI270_INTERNAL_STATUS_AXES_REMAP_ERR_MSK BIT(5)
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#define BMI270_INTERNAL_STATUS_ODR_50HZ_ERR_MSK BIT(6)
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#define BMI270_TEMPERATURE_0_REG 0x22
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#define BMI270_ACC_CONF_REG 0x40
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#define BMI270_ACC_CONF_ODR_MSK GENMASK(3, 0)
···
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#define BMI270_PWR_CTRL_GYR_EN_MSK BIT(1)
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#define BMI270_PWR_CTRL_ACCEL_EN_MSK BIT(2)
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#define BMI270_PWR_CTRL_TEMP_EN_MSK BIT(3)
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/* See datasheet section 4.6.14, Temperature Sensor */
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#define BMI270_TEMP_OFFSET 11776
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#define BMI270_TEMP_SCALE 1953125
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#define BMI260_INIT_DATA_FILE "bmi260-init-data.fw"
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#define BMI270_INIT_DATA_FILE "bmi270-init-data.fw"
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enum bmi270_sensor_type {
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BMI270_ACCEL = 0,
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BMI270_GYRO,
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BMI270_TEMP,
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};
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struct bmi270_scale {
···
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{ 0, 66 },
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};
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static const struct bmi270_scale bmi270_temp_scale[] = {
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{ BMI270_TEMP_SCALE / MICRO, BMI270_TEMP_SCALE % MICRO },
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};
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struct bmi270_scale_item {
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const struct bmi270_scale *tbl;
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int num;
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[BMI270_GYRO] = {
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.tbl = bmi270_gyro_scale,
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.num = ARRAY_SIZE(bmi270_gyro_scale),
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},
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[BMI270_TEMP] = {
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.tbl = bmi270_temp_scale,
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.num = ARRAY_SIZE(bmi270_temp_scale),
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},
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};
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···
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}
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static int bmi270_get_scale(struct bmi270_data *bmi270_device, int chan_type,
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int *uscale)
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int *scale, int *uscale)
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{
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int ret;
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unsigned int val;
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val = FIELD_GET(BMI270_GYR_CONF_RANGE_MSK, val);
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bmi270_scale_item = bmi270_scale_table[BMI270_GYRO];
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break;
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case IIO_TEMP:
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val = 0;
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bmi270_scale_item = bmi270_scale_table[BMI270_TEMP];
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break;
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default:
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return -EINVAL;
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}
···
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if (val >= bmi270_scale_item.num)
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return -EINVAL;
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*scale = bmi270_scale_item.tbl[val].scale;
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*uscale = bmi270_scale_item.tbl[val].uscale;
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return 0;
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}
···
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case IIO_ANGL_VEL:
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reg = BMI270_ANG_VEL_X_REG + (axis - IIO_MOD_X) * 2;
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break;
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case IIO_TEMP:
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reg = BMI270_TEMPERATURE_0_REG;
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break;
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default:
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return -EINVAL;
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}
···
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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ret = bmi270_get_scale(bmi270_device, chan->type, val2);
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ret = bmi270_get_scale(bmi270_device, chan->type, val, val2);
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return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_OFFSET:
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switch (chan->type) {
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case IIO_TEMP:
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*val = BMI270_TEMP_OFFSET;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret = bmi270_get_odr(bmi270_device, chan->type, val, val2);
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return ret ? ret : IIO_VAL_INT_PLUS_MICRO;
···
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BMI270_ANG_VEL_CHANNEL(X),
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BMI270_ANG_VEL_CHANNEL(Y),
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BMI270_ANG_VEL_CHANNEL(Z),
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.scan_index = -1, /* No buffer support */
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},
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IIO_CHAN_SOFT_TIMESTAMP(BMI270_SCAN_TIMESTAMP),
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};
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···
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ret = regmap_set_bits(regmap, BMI270_PWR_CTRL_REG,
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BMI270_PWR_CTRL_AUX_EN_MSK |
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BMI270_PWR_CTRL_GYR_EN_MSK |
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BMI270_PWR_CTRL_ACCEL_EN_MSK);
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BMI270_PWR_CTRL_ACCEL_EN_MSK |
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BMI270_PWR_CTRL_TEMP_EN_MSK);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to enable accelerometer and gyroscope");
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