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iio: accel: bmi088: Modified the scale calculate
The units after application of scale are 100*m/s^2, The scale calculation is only for the device with the range of 3, 6, 12, and 24g, but some other chips have a range of 2, 4, 6, and 8g. Modified the scales from formula to a list, the scales in the list are calculated as 9.8/32768*pow(2,reg41+1)*1.5, refer to datasheet 5.3.4. The new units after the application of scale are m/s^2. Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com> Signed-off-by: LI Qingwu <Qing-wu.Li@leica-geosystems.com.cn> Link: https://lore.kernel.org/r/20220526133359.2261928-2-Qing-wu.Li@leica-geosystems.com.cn Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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f0ca36b031
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1 changed files with 11 additions and 4 deletions
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@ -6,6 +6,7 @@
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* Copyright (c) 2018-2021, Topic Embedded Products
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*/
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#include <linux/bitfield.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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@ -73,6 +74,8 @@
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#define BMI088_ACCEL_FIFO_MODE_FIFO 0x40
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#define BMI088_ACCEL_FIFO_MODE_STREAM 0x80
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#define BMIO088_ACCEL_ACC_RANGE_MSK GENMASK(1, 0)
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enum bmi088_accel_axis {
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AXIS_X,
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AXIS_Y,
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@ -119,6 +122,7 @@ struct bmi088_accel_chip_info {
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u8 chip_id;
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const struct iio_chan_spec *channels;
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int num_channels;
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const int scale_table[4][2];
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};
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struct bmi088_accel_data {
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@ -280,6 +284,7 @@ static int bmi088_accel_read_raw(struct iio_dev *indio_dev,
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struct bmi088_accel_data *data = iio_priv(indio_dev);
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struct device *dev = regmap_get_device(data->regmap);
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int ret;
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int reg;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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@ -330,13 +335,14 @@ static int bmi088_accel_read_raw(struct iio_dev *indio_dev,
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return ret;
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ret = regmap_read(data->regmap,
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BMI088_ACCEL_REG_ACC_RANGE, val);
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BMI088_ACCEL_REG_ACC_RANGE, ®);
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if (ret)
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goto out_read_raw_pm_put;
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*val2 = 15 - (*val & 0x3);
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*val = 3 * 980;
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ret = IIO_VAL_FRACTIONAL_LOG2;
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reg = FIELD_GET(BMIO088_ACCEL_ACC_RANGE_MSK, reg);
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*val = data->chip_info->scale_table[reg][0];
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*val2 = data->chip_info->scale_table[reg][1];
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ret = IIO_VAL_INT_PLUS_MICRO;
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goto out_read_raw_pm_put;
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default:
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@ -432,6 +438,7 @@ static const struct bmi088_accel_chip_info bmi088_accel_chip_info_tbl[] = {
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.chip_id = 0x1E,
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.channels = bmi088_accel_channels,
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.num_channels = ARRAY_SIZE(bmi088_accel_channels),
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.scale_table = {{0, 897}, {0, 1794}, {0, 3589}, {0, 7178}},
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},
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};
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