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Message-Id: <44a301d5605bcf5b30ae60b21d0b312717b938bc.1658597501.git.ang.iglesiasg@gmail.com>
Date: Sat, 23 Jul 2022 19:38:43 +0200
From: Angel Iglesias <ang.iglesiasg@...il.com>
To: linux-iio@...r.kernel.org
Cc: Angel Iglesias <ang.iglesiasg@...il.com>,
Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Paul Cercueil <paul@...pouillou.net>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/5] 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 auxiliar functions for read each sensor type calibration are converted
to a callback available on the chip_info struct.
Suggested-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Angel Iglesias <ang.iglesiasg@...il.com>
---
drivers/iio/pressure/bmp280-core.c | 91 ++++++++++++++++++------------
1 file changed, 54 insertions(+), 37 deletions(-)
diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index fe7aa81e7cc9..60fba199c7a0 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -107,19 +107,28 @@ 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 *, unsigned int);
};
/*
@@ -147,15 +156,14 @@ 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, unsigned int chip)
{
int ret;
unsigned int tmp;
__le16 l16;
__be16 b16;
struct device *dev = data->dev;
+ struct bmp280_calib *calib = &data->calib.bmp280;
__le16 t_buf[BMP280_COMP_TEMP_REG_COUNT / 2];
__le16 p_buf[BMP280_COMP_PRESS_REG_COUNT / 2];
@@ -640,15 +648,22 @@ 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_temp_default = ilog2(2),
.oversampling_press_avail = bmp280_oversampling_avail,
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ .oversampling_press_default = ilog2(16),
.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)
@@ -670,19 +685,27 @@ 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 = ilog2(2),
.oversampling_press_avail = bmp280_oversampling_avail,
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ .oversampling_press_default = ilog2(16),
.oversampling_humid_avail = bmp280_oversampling_avail,
.num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
+ .oversampling_humid_default = ilog2(16),
.chip_config = bme280_chip_config,
.read_temp = bmp280_read_temp,
.read_press = bmp280_read_press,
.read_humid = bmp280_read_humid,
+ .read_calib = bmp280_read_calib,
};
static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
@@ -748,11 +771,11 @@ 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, unsigned int chip)
{
int ret;
int i;
+ struct bmp180_calib *calib = &data->calib.bmp180;
__be16 buf[BMP180_REG_CALIB_COUNT / 2];
ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START, buf,
@@ -913,17 +936,24 @@ 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 = ilog2(1),
.oversampling_press_avail = bmp180_oversampling_press_avail,
.num_oversampling_press_avail =
ARRAY_SIZE(bmp180_oversampling_press_avail),
+ .oversampling_press_default = ilog2(8),
.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)
@@ -993,6 +1023,7 @@ int bmp280_common_probe(struct device *dev,
int ret;
struct iio_dev *indio_dev;
struct bmp280_data *data;
+ const struct bmp280_chip_info *chip_info;
unsigned int chip_id;
struct gpio_desc *gpiod;
@@ -1011,30 +1042,25 @@ 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,
@@ -1071,7 +1097,8 @@ 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) {
@@ -1091,21 +1118,11 @@ 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, chip_id);
+ 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
--
2.37.1
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