linux-kernel - [PATCH V2 2/6] iio: accel: bmi088: Make it possible to config scales

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Date:   Tue, 10 May 2022 14:17:49 +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 2/6] iio: accel: bmi088: Make it possible to config scales

The sensor can set the scales by writing the range register 0x41,
The current driver has no interface to configure it.
The commit adds the interface for config the scales.

Reviewed-by: Alexandru Ardelean <ardeleanalex@...il.com>
Signed-off-by: LI Qingwu <Qing-wu.Li@...ca-geosystems.com.cn>
---
 drivers/iio/accel/bmi088-accel-core.c | 32 ++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/bmi088-accel-core.c b/drivers/iio/accel/bmi088-accel-core.c
index 9300313b63cb..8fee1d02e773 100644
--- a/drivers/iio/accel/bmi088-accel-core.c
+++ b/drivers/iio/accel/bmi088-accel-core.c
@@ -237,6 +237,21 @@ static int bmi088_accel_set_sample_freq(struct bmi088_accel_data *data, int val)
 				  BMI088_ACCEL_MODE_ODR_MASK, regval);
 }
 
+static int bmi088_accel_set_scale(struct bmi088_accel_data *data, int val, int val2)
+{
+	unsigned int i;
+
+	for (i = 0; i < 4; i++)
+		if (val == data->chip_info->scale_table[i][0] &&
+		    val2 == data->chip_info->scale_table[i][1])
+			break;
+
+	if (i >= 4)
+		return -EINVAL;
+
+	return regmap_write(data->regmap, BMI088_ACCEL_REG_ACC_RANGE, i);
+}
+
 static int bmi088_accel_get_temp(struct bmi088_accel_data *data, int *val)
 {
 	int ret;
@@ -368,7 +383,13 @@ static int bmi088_accel_read_avail(struct iio_dev *indio_dev,
 			     const int **vals, int *type, int *length,
 			     long mask)
 {
+	struct bmi088_accel_data *data = iio_priv(indio_dev);
 	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		*vals = (const int *)data->chip_info->scale_table;
+		*length = 8;
+		*type = IIO_VAL_INT_PLUS_MICRO;
+		return IIO_AVAIL_LIST;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		*type = IIO_VAL_INT_PLUS_MICRO;
 		*vals = bmi088_sample_freqs;
@@ -388,6 +409,14 @@ static int bmi088_accel_write_raw(struct iio_dev *indio_dev,
 	int ret;
 
 	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		ret = pm_runtime_resume_and_get(dev);
+		if (ret)
+			return ret;
+		ret = bmi088_accel_set_scale(data, val, val2);
+		pm_runtime_mark_last_busy(dev);
+		pm_runtime_put_autosuspend(dev);
+		return ret;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		ret = pm_runtime_resume_and_get(dev);
 		if (ret)
@@ -409,7 +438,8 @@ static int bmi088_accel_write_raw(struct iio_dev *indio_dev,
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
 				BIT(IIO_CHAN_INFO_SAMP_FREQ), \
-	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
+				BIT(IIO_CHAN_INFO_SCALE), \
 	.scan_index = AXIS_##_axis, \
 }
 
-- 
2.25.1