linux-kernel - [PATCH 2/5] iio: pressure: bmp280: Add preinit callback

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Message-Id: <724e92e64e6d91d48d762e804b430c716679bccb.1671986815.git.ang.iglesiasg@gmail.com>
Date:   Sun, 25 Dec 2022 17:57:06 +0100
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>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Paul Cercueil <paul@...pouillou.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] iio: pressure: bmp280: Add preinit callback

Adds preinit callback to execute operations on probe before applying
initial configuration.

Signed-off-by: Angel Iglesias <ang.iglesiasg@...il.com>

diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 46959a91408f..c37cf2caec68 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -217,6 +217,7 @@ struct bmp280_chip_info {
 	int (*read_press)(struct bmp280_data *, int *, int *);
 	int (*read_humid)(struct bmp280_data *, int *, int *);
 	int (*read_calib)(struct bmp280_data *);
+	int (*preinit)(struct bmp280_data *);
 };
 
 /*
@@ -935,6 +936,7 @@ static const struct bmp280_chip_info bmp280_chip_info = {
 	.read_temp = bmp280_read_temp,
 	.read_press = bmp280_read_press,
 	.read_calib = bmp280_read_calib,
+	.preinit = NULL,
 };
 
 static int bme280_chip_config(struct bmp280_data *data)
@@ -979,6 +981,7 @@ static const struct bmp280_chip_info bme280_chip_info = {
 	.read_press = bmp280_read_press,
 	.read_humid = bmp280_read_humid,
 	.read_calib = bme280_read_calib,
+	.preinit = NULL,
 };
 
 /*
@@ -1220,6 +1223,12 @@ static const int bmp380_odr_table[][2] = {
 	[BMP380_ODR_0_0015HZ]	= {0, 1526},
 };
 
+static int bmp380_preinit(struct bmp280_data *data)
+{
+	/* BMP3xx requires soft-reset as part of initialization */
+	return bmp380_cmd(data, BMP380_CMD_SOFT_RESET);
+}
+
 static int bmp380_chip_config(struct bmp280_data *data)
 {
 	bool change = false, aux;
@@ -1349,6 +1358,7 @@ static const struct bmp280_chip_info bmp380_chip_info = {
 	.read_temp = bmp380_read_temp,
 	.read_press = bmp380_read_press,
 	.read_calib = bmp380_read_calib,
+	.preinit = bmp380_preinit,
 };
 
 static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
@@ -1604,6 +1614,7 @@ static const struct bmp280_chip_info bmp180_chip_info = {
 	.read_temp = bmp180_read_temp,
 	.read_press = bmp180_read_press,
 	.read_calib = bmp180_read_calib,
+	.preinit = NULL,
 };
 
 static irqreturn_t bmp085_eoc_irq(int irq, void *d)
@@ -1762,9 +1773,13 @@ int bmp280_common_probe(struct device *dev,
 		return -EINVAL;
 	}
 
-	/* BMP3xx requires soft-reset as part of initialization */
-	if (chip_id == BMP380_CHIP_ID) {
-		ret = bmp380_cmd(data, BMP380_CMD_SOFT_RESET);
+	/*
+	 * Some chips like the BMP3xx have preinit tasks to run
+	 * before applying the initial configuration.
+	 */
+	if (data->chip_info->preinit) {
+		ret = data->chip_info->preinit(data);
+		dev_err(dev, "error running preinit tasks");
 		if (ret < 0)
 			return ret;
 	}
-- 
2.39.0