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Message-Id: <20240711211558.106327-5-vassilisamir@gmail.com>
Date: Thu, 11 Jul 2024 23:15:52 +0200
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: jic23@...nel.org,
lars@...afoo.de,
robh@...nel.org,
krzk+dt@...nel.org,
conor+dt@...nel.org,
andriy.shevchenko@...ux.intel.com
Cc: vassilisamir@...il.com,
ang.iglesiasg@...il.com,
linus.walleij@...aro.org,
biju.das.jz@...renesas.com,
javier.carrasco.cruz@...il.com,
semen.protsenko@...aro.org,
579lpy@...il.com,
ak@...klinger.de,
linux-iio@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v1 04/10] iio: pressure: bmp280: Use bulk read for humidity calibration data
Convert individual reads to a bulk read for the humidity calibration data.
Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
---
drivers/iio/pressure/bmp280-core.c | 57 +++++++++---------------------
drivers/iio/pressure/bmp280.h | 5 +++
2 files changed, 21 insertions(+), 41 deletions(-)
diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
index 3deaa57bb3f5..9c32266403bd 100644
--- a/drivers/iio/pressure/bmp280-core.c
+++ b/drivers/iio/pressure/bmp280-core.c
@@ -118,6 +118,8 @@ enum bmp580_odr {
*/
enum { T1, T2, T3, P1, P2, P3, P4, P5, P6, P7, P8, P9 };
+enum { H2 = 0, H3 = 2, H4 = 3, H5 = 4, H6 = 6 };
+
enum {
/* Temperature calib indexes */
BMP380_T1 = 0,
@@ -344,6 +346,7 @@ static int bme280_read_calib(struct bmp280_data *data)
{
struct bmp280_calib *calib = &data->calib.bmp280;
struct device *dev = data->dev;
+ s16 h4_upper, h4_lower;
unsigned int tmp;
int ret;
@@ -352,14 +355,6 @@ static int bme280_read_calib(struct bmp280_data *data)
if (ret)
return ret;
- /*
- * Read humidity calibration values.
- * Due to some odd register addressing we cannot just
- * do a big bulk read. Instead, we have to read each Hx
- * value separately and sometimes do some bit shifting...
- * Humidity data is only available on BME280.
- */
-
ret = regmap_read(data->regmap, BME280_REG_COMP_H1, &tmp);
if (ret) {
dev_err(dev, "failed to read H1 comp value\n");
@@ -368,43 +363,23 @@ static int bme280_read_calib(struct bmp280_data *data)
calib->H1 = tmp;
ret = regmap_bulk_read(data->regmap, BME280_REG_COMP_H2,
- &data->le16, sizeof(data->le16));
- if (ret) {
- dev_err(dev, "failed to read H2 comp value\n");
- return ret;
- }
- calib->H2 = sign_extend32(le16_to_cpu(data->le16), 15);
-
- ret = regmap_read(data->regmap, BME280_REG_COMP_H3, &tmp);
- if (ret) {
- dev_err(dev, "failed to read H3 comp value\n");
- return ret;
- }
- calib->H3 = tmp;
-
- ret = regmap_bulk_read(data->regmap, BME280_REG_COMP_H4,
- &data->be16, sizeof(data->be16));
- if (ret) {
- dev_err(dev, "failed to read H4 comp value\n");
- return ret;
- }
- calib->H4 = sign_extend32(((be16_to_cpu(data->be16) >> 4) & 0xff0) |
- (be16_to_cpu(data->be16) & 0xf), 11);
-
- ret = regmap_bulk_read(data->regmap, BME280_REG_COMP_H5,
- &data->le16, sizeof(data->le16));
+ data->bme280_humid_cal_buf,
+ sizeof(data->bme280_humid_cal_buf));
if (ret) {
- dev_err(dev, "failed to read H5 comp value\n");
+ dev_err(dev, "failed to read humidity calibration values\n");
return ret;
}
- calib->H5 = sign_extend32(FIELD_GET(BME280_COMP_H5_MASK, le16_to_cpu(data->le16)), 11);
- ret = regmap_read(data->regmap, BME280_REG_COMP_H6, &tmp);
- if (ret) {
- dev_err(dev, "failed to read H6 comp value\n");
- return ret;
- }
- calib->H6 = sign_extend32(tmp, 7);
+ calib->H2 = get_unaligned_le16(&data->bme280_humid_cal_buf[H2]);
+ calib->H3 = data->bme280_humid_cal_buf[H3];
+ h4_upper = FIELD_GET(BME280_COMP_H4_MASK_UP,
+ get_unaligned_be16(&data->bme280_humid_cal_buf[H4]));
+ h4_lower = FIELD_GET(BME280_COMP_H4_MASK_LOW,
+ get_unaligned_be16(&data->bme280_humid_cal_buf[H4]));
+ calib->H4 = sign_extend32((h4_upper & ~BME280_COMP_H4_MASK_LOW) | h4_lower, 11);
+ calib->H5 = sign_extend32(FIELD_GET(BME280_COMP_H5_MASK,
+ get_unaligned_le16(&data->bme280_humid_cal_buf[H5])), 11);
+ calib->H6 = data->bme280_humid_cal_buf[H6];
return 0;
}
diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h
index ccacc67c1473..56c01f224728 100644
--- a/drivers/iio/pressure/bmp280.h
+++ b/drivers/iio/pressure/bmp280.h
@@ -257,8 +257,12 @@
#define BME280_REG_COMP_H5 0xE5
#define BME280_REG_COMP_H6 0xE7
+#define BME280_COMP_H4_MASK_UP GENMASK(15, 4)
+#define BME280_COMP_H4_MASK_LOW GENMASK(3, 0)
#define BME280_COMP_H5_MASK GENMASK(15, 4)
+#define BME280_CONTIGUOUS_CALIB_REGS 7
+
#define BME280_OSRS_HUMIDITY_MASK GENMASK(2, 0)
#define BME280_OSRS_HUMIDITY_SKIP 0
#define BME280_OSRS_HUMIDITY_1X 1
@@ -423,6 +427,7 @@ struct bmp280_data {
/* Calibration data buffers */
__le16 bmp280_cal_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
__be16 bmp180_cal_buf[BMP180_REG_CALIB_COUNT / 2];
+ u8 bme280_humid_cal_buf[BME280_CONTIGUOUS_CALIB_REGS];
u8 bmp380_cal_buf[BMP380_CALIB_REG_COUNT];
/* Miscellaneous, endianness-aware data buffers */
__le16 le16;
--
2.25.1
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