linux-kernel - [PATCH V2 1/6] iio: accel: bmi088: Modified the scale calculate

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Message-Id: <20220510141753.3878390-2-Qing-wu.Li@leica-geosystems.com.cn>
Date:   Tue, 10 May 2022 14:17:48 +0000
From:   LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>
To:     jic23@...nel.org, lars@...afoo.de, mchehab+huawei@...nel.org,
        ardeleanalex@...il.com, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Qing-wu.Li@...ca-geosystems.com.cn,
        robh+dt@...nel.org, mike.looijmans@...ic.nl,
        devicetree@...r.kernel.org
Subject: [PATCH V2 1/6] 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 formula to a scale list.
The scales in the list are calculated by 1/sensitivity*9.8.
The new units after the application of scale are m/s^2.

Signed-off-by: LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>
---
 drivers/iio/accel/bmi088-accel-core.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/accel/bmi088-accel-core.c b/drivers/iio/accel/bmi088-accel-core.c
index a06dae5c971d..9300313b63cb 100644
--- a/drivers/iio/accel/bmi088-accel-core.c
+++ b/drivers/iio/accel/bmi088-accel-core.c
@@ -119,6 +119,7 @@ struct bmi088_accel_chip_info {
 	u8 chip_id;
 	const struct iio_chan_spec *channels;
 	int num_channels;
+	const int scale_table[4][2];
 };
 
 struct bmi088_accel_data {
@@ -280,6 +281,7 @@ static int bmi088_accel_read_raw(struct iio_dev *indio_dev,
 	struct bmi088_accel_data *data = iio_priv(indio_dev);
 	struct device *dev = regmap_get_device(data->regmap);
 	int ret;
+	int reg;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
@@ -330,13 +332,12 @@ static int bmi088_accel_read_raw(struct iio_dev *indio_dev,
 				return ret;
 
 			ret = regmap_read(data->regmap,
-					  BMI088_ACCEL_REG_ACC_RANGE, val);
+					  BMI088_ACCEL_REG_ACC_RANGE, &reg);
 			if (ret)
 				goto out_read_raw_pm_put;
-
-			*val2 = 15 - (*val & 0x3);
-			*val = 3 * 980;
-			ret = IIO_VAL_FRACTIONAL_LOG2;
+			*val = data->chip_info->scale_table[reg&0x03][0];
+			*val2 = data->chip_info->scale_table[reg&0x03][1];
+			ret = IIO_VAL_INT_PLUS_MICRO;
 
 			goto out_read_raw_pm_put;
 		default:
@@ -432,6 +433,7 @@ static const struct bmi088_accel_chip_info bmi088_accel_chip_info_tbl[] = {
 		.chip_id = 0x1E,
 		.channels = bmi088_accel_channels,
 		.num_channels = ARRAY_SIZE(bmi088_accel_channels),
+		.scale_table = {{0, 897}, {0, 1795}, {0, 3590}, {0, 7179}},
 	},
 };
 
-- 
2.25.1