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Message-Id: <584c90f309e4f24bf2e4aa2b15c8577d288f978d.1663025017.git.ang.iglesiasg@gmail.com>
Date: Tue, 13 Sep 2022 01:47:31 +0200
From: Angel Iglesias <ang.iglesiasg@...il.com>
To: linux-iio <linux-iio@...r.kernel.org>
Cc: Angel Iglesias <ang.iglesiasg@...il.com>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Paul Cercueil <paul@...pouillou.net>,
Ulf Hansson <ulf.hansson@...aro.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v6 4/9] iio: pressure: bmp280: simplify driver initialization logic
Simplified common initialization logic of different sensor types
unifying calibration and initial configuration recovery.
Default config param values of each sensor type are stored inside
chip_info structure and used to initialize sensor data struct instance.
The helper functions for read each sensor type calibration are converted
to a callback available on the chip_info struct.
Separated bme280 specific calibration code from bmp280 function. Dropped
the additional chip_id argument in bmp280 code as is not longer required.
Now both bmp280/bme280 calibration function use same signature as bmp180.
Suggested-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Angel Iglesias <ang.iglesiasg@...il.com>
---
drivers/iio/pressure/bmp280-core.c | 126 +++++++++++++++++++----------
1 file changed, 83 insertions(+), 43 deletions(-)
diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 4793bcd9f0b3..203623d32032 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -109,19 +109,28 @@ struct bmp280_data {
};
struct bmp280_chip_info {
+ unsigned int id_reg;
+
+ int num_channels;
+ unsigned int start_up_time;
+
const int *oversampling_temp_avail;
int num_oversampling_temp_avail;
+ int oversampling_temp_default;
const int *oversampling_press_avail;
int num_oversampling_press_avail;
+ int oversampling_press_default;
const int *oversampling_humid_avail;
int num_oversampling_humid_avail;
+ int oversampling_humid_default;
int (*chip_config)(struct bmp280_data *);
int (*read_temp)(struct bmp280_data *, int *);
int (*read_press)(struct bmp280_data *, int *, int *);
int (*read_humid)(struct bmp280_data *, int *, int *);
+ int (*read_calib)(struct bmp280_data *);
};
/*
@@ -148,15 +157,10 @@ static const struct iio_chan_spec bmp280_channels[] = {
},
};
-static int bmp280_read_calib(struct bmp280_data *data,
- struct bmp280_calib *calib,
- unsigned int chip)
+static int bmp280_read_calib(struct bmp280_data *data)
{
+ struct bmp280_calib *calib = &data->calib.bmp280;
__le16 c_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
- struct device *dev = data->dev;
- unsigned int tmp;
- __le16 l16;
- __be16 b16;
int ret;
@@ -188,6 +192,25 @@ static int bmp280_read_calib(struct bmp280_data *data,
calib->P8 = le16_to_cpu(c_buf[P8]);
calib->P9 = le16_to_cpu(c_buf[P9]);
+ return 0;
+}
+
+static int bme280_read_calib(struct bmp280_data *data)
+{
+ struct bmp280_calib *calib = &data->calib.bmp280;
+ struct device *dev = data->dev;
+ unsigned int tmp;
+ __le16 l16;
+ __be16 b16;
+ int ret;
+
+ /* Load shared calibration params with bmp280 first */
+ ret = bmp280_read_calib(data);
+ if (ret < 0) {
+ dev_err(dev, "failed to read common bmp280 calibration parameters\n");
+ return ret;
+ }
+
/*
* Read humidity calibration values.
* Due to some odd register addressing we cannot just
@@ -195,8 +218,6 @@ static int bmp280_read_calib(struct bmp280_data *data,
* value separately and sometimes do some bit shifting...
* Humidity data is only available on BME280.
*/
- if (chip != BME280_CHIP_ID)
- return 0;
ret = regmap_read(data->regmap, BMP280_REG_COMP_H1, &tmp);
if (ret < 0) {
@@ -631,15 +652,32 @@ static int bmp280_chip_config(struct bmp280_data *data)
static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
static const struct bmp280_chip_info bmp280_chip_info = {
+ .id_reg = BMP280_REG_ID,
+ .start_up_time = 2000,
+ .num_channels = 2,
+
.oversampling_temp_avail = bmp280_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ /*
+ * Oversampling config values on BMx280 have one additional setting
+ * that other generations of the family don't:
+ * The value 0 means the measurement is bypassed instead of
+ * oversampling set to x1.
+ *
+ * To account for this difference, and preserve the same common
+ * config logic, this is handled later on chip_config callback
+ * incrementing one unit the oversampling setting.
+ */
+ .oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,
.oversampling_press_avail = bmp280_oversampling_avail,
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ .oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,
.chip_config = bmp280_chip_config,
.read_temp = bmp280_read_temp,
.read_press = bmp280_read_press,
+ .read_calib = bmp280_read_calib,
};
static int bme280_chip_config(struct bmp280_data *data)
@@ -661,19 +699,27 @@ static int bme280_chip_config(struct bmp280_data *data)
}
static const struct bmp280_chip_info bme280_chip_info = {
+ .id_reg = BMP280_REG_ID,
+ .start_up_time = 2000,
+ .num_channels = 3,
+
.oversampling_temp_avail = bmp280_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ .oversampling_temp_default = BMP280_OSRS_TEMP_2X - 1,
.oversampling_press_avail = bmp280_oversampling_avail,
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ .oversampling_press_default = BMP280_OSRS_PRESS_16X - 1,
.oversampling_humid_avail = bmp280_oversampling_avail,
.num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ .oversampling_humid_default = BMP280_OSRS_HUMIDITY_16X - 1,
.chip_config = bme280_chip_config,
.read_temp = bmp280_read_temp,
.read_press = bmp280_read_press,
.read_humid = bmp280_read_humid,
+ .read_calib = bme280_read_calib,
};
static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
@@ -741,9 +787,9 @@ static int bmp180_read_adc_temp(struct bmp280_data *data, int *val)
return 0;
}
-static int bmp180_read_calib(struct bmp280_data *data,
- struct bmp180_calib *calib)
+static int bmp180_read_calib(struct bmp280_data *data)
{
+ struct bmp180_calib *calib = &data->calib.bmp180;
__be16 buf[BMP180_REG_CALIB_COUNT / 2];
int ret;
int i;
@@ -909,17 +955,24 @@ static const int bmp180_oversampling_temp_avail[] = { 1 };
static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
static const struct bmp280_chip_info bmp180_chip_info = {
+ .id_reg = BMP280_REG_ID,
+ .start_up_time = 2000,
+ .num_channels = 2,
+
.oversampling_temp_avail = bmp180_oversampling_temp_avail,
.num_oversampling_temp_avail =
ARRAY_SIZE(bmp180_oversampling_temp_avail),
+ .oversampling_temp_default = 0,
.oversampling_press_avail = bmp180_oversampling_press_avail,
.num_oversampling_press_avail =
ARRAY_SIZE(bmp180_oversampling_press_avail),
+ .oversampling_press_default = BMP180_MEAS_PRESS_8X,
.chip_config = bmp180_chip_config,
.read_temp = bmp180_read_temp,
.read_press = bmp180_read_press,
+ .read_calib = bmp180_read_calib,
};
static irqreturn_t bmp085_eoc_irq(int irq, void *d)
@@ -986,6 +1039,7 @@ int bmp280_common_probe(struct device *dev,
const char *name,
int irq)
{
+ const struct bmp280_chip_info *chip_info;
struct iio_dev *indio_dev;
struct bmp280_data *data;
struct gpio_desc *gpiod;
@@ -1007,30 +1061,25 @@ int bmp280_common_probe(struct device *dev,
switch (chip) {
case BMP180_CHIP_ID:
- indio_dev->num_channels = 2;
- data->chip_info = &bmp180_chip_info;
- data->oversampling_press = ilog2(8);
- data->oversampling_temp = ilog2(1);
- data->start_up_time = 10000;
+ chip_info = &bmp180_chip_info;
break;
case BMP280_CHIP_ID:
- indio_dev->num_channels = 2;
- data->chip_info = &bmp280_chip_info;
- data->oversampling_press = ilog2(16);
- data->oversampling_temp = ilog2(2);
- data->start_up_time = 2000;
+ chip_info = &bmp280_chip_info;
break;
case BME280_CHIP_ID:
- indio_dev->num_channels = 3;
- data->chip_info = &bme280_chip_info;
- data->oversampling_press = ilog2(16);
- data->oversampling_humid = ilog2(16);
- data->oversampling_temp = ilog2(2);
- data->start_up_time = 2000;
+ chip_info = &bme280_chip_info;
break;
default:
return -EINVAL;
}
+ data->chip_info = chip_info;
+
+ /* Apply initial values from chip info structure */
+ indio_dev->num_channels = chip_info->num_channels;
+ data->oversampling_press = chip_info->oversampling_press_default;
+ data->oversampling_humid = chip_info->oversampling_humid_default;
+ data->oversampling_temp = chip_info->oversampling_temp_default;
+ data->start_up_time = chip_info->start_up_time;
/* Bring up regulators */
regulator_bulk_set_supply_names(data->supplies,
@@ -1067,7 +1116,8 @@ int bmp280_common_probe(struct device *dev,
}
data->regmap = regmap;
- ret = regmap_read(regmap, BMP280_REG_ID, &chip_id);
+
+ ret = regmap_read(regmap, data->chip_info->id_reg, &chip_id);
if (ret < 0)
return ret;
if (chip_id != chip) {
@@ -1087,21 +1137,11 @@ int bmp280_common_probe(struct device *dev,
* non-volatile memory during production". Let's read them out at probe
* time once. They will not change.
*/
- if (chip_id == BMP180_CHIP_ID) {
- ret = bmp180_read_calib(data, &data->calib.bmp180);
- if (ret < 0) {
- dev_err(data->dev,
- "failed to read calibration coefficients\n");
- return ret;
- }
- } else if (chip_id == BMP280_CHIP_ID || chip_id == BME280_CHIP_ID) {
- ret = bmp280_read_calib(data, &data->calib.bmp280, chip_id);
- if (ret < 0) {
- dev_err(data->dev,
- "failed to read calibration coefficients\n");
- return ret;
- }
- }
+
+ ret = data->chip_info->read_calib(data);
+ if (ret < 0)
+ return dev_err_probe(data->dev, ret,
+ "failed to read calibration coefficients\n");
/*
* Attempt to grab an optional EOC IRQ - only the BMP085 has this
--
2.37.3
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