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Date: Mon, 27 May 2024 20:38:01 +0200
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: jic23@...nel.org,
lars@...afoo.de
Cc: himanshujha199640@...il.com,
linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org,
Vasileios Amoiridis <vassilisamir@...il.com>
Subject: [PATCH v1 13/17] iio: chemical: bme680: Add read buffers in DMA safe region
Move the buffers that are used in order to read data from the
device in a DMA-safe region. Also create defines for the number
of bytes that are being read from the device and don't use
magic numbers.
Signed-off-by: Vasileios Amoiridis <vassilisamir@...il.com>
---
drivers/iio/chemical/bme680.h | 7 ++++++
drivers/iio/chemical/bme680_core.c | 37 +++++++++++++++---------------
2 files changed, 25 insertions(+), 19 deletions(-)
diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h
index 5f602170a3af..17ea59253923 100644
--- a/drivers/iio/chemical/bme680.h
+++ b/drivers/iio/chemical/bme680.h
@@ -54,6 +54,13 @@
#define BME680_REG_MEAS_STAT_0 0x1D
#define BME680_GAS_MEAS_BIT BIT(6)
+#define BME680_TEMP_NUM_BYTES 3
+#define BME680_PRESS_NUM_BYTES 3
+#define BME680_HUMID_NUM_BYTES 2
+#define BME680_GAS_NUM_BYTES 2
+
+#define BME680_MEAS_TRIM_MASK GENMASK(24, 4)
+
/* Calibration Parameters */
#define BME680_T2_LSB_REG 0x8A
#define BME680_H2_MSB_REG 0xE1
diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index a6f425076d36..b055eeee8f1c 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -115,6 +115,9 @@ struct bme680_data {
* transfer buffers to live in their own cache lines.
*/
union {
+ u8 buf[3];
+ unsigned int check;
+ __be16 be16;
u8 bme680_cal_buf_1[BME680_CALIB_RANGE_1_LEN];
u8 bme680_cal_buf_2[BME680_CALIB_RANGE_2_LEN];
u8 bme680_cal_buf_3[BME680_CALIB_RANGE_3_LEN];
@@ -547,7 +550,6 @@ static int bme680_read_temp(struct bme680_data *data, int *val)
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
- __be32 tmp = 0;
u32 adc_temp;
s16 comp_temp;
@@ -559,13 +561,14 @@ static int bme680_read_temp(struct bme680_data *data, int *val)
bme680_wait_for_eoc(data);
ret = regmap_bulk_read(data->regmap, BME680_REG_TEMP_MSB,
- &tmp, 3);
+ data->buf, BME680_TEMP_NUM_BYTES);
if (ret < 0) {
dev_err(dev, "failed to read temperature\n");
return ret;
}
- adc_temp = be32_to_cpu(tmp) >> 12;
+ adc_temp = FIELD_GET(BME680_MEAS_TRIM_MASK,
+ get_unaligned_be24(data->buf));
if (adc_temp == BME680_MEAS_SKIPPED) {
/* reading was skipped */
dev_err(dev, "reading temperature skipped\n");
@@ -591,7 +594,6 @@ static int bme680_read_press(struct bme680_data *data,
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
- __be32 tmp = 0;
u32 adc_press;
/* Read and compensate temperature to get a reading of t_fine */
@@ -600,13 +602,14 @@ static int bme680_read_press(struct bme680_data *data,
return ret;
ret = regmap_bulk_read(data->regmap, BME680_REG_PRESS_MSB,
- &tmp, 3);
+ data->buf, BME680_PRESS_NUM_BYTES);
if (ret < 0) {
dev_err(dev, "failed to read pressure\n");
return ret;
}
- adc_press = be32_to_cpu(tmp) >> 12;
+ adc_press = FIELD_GET(BME680_MEAS_TRIM_MASK,
+ get_unaligned_be24(data->buf));
if (adc_press == BME680_MEAS_SKIPPED) {
/* reading was skipped */
dev_err(dev, "reading pressure skipped\n");
@@ -623,7 +626,6 @@ static int bme680_read_humid(struct bme680_data *data,
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
- __be16 tmp = 0;
u16 adc_humidity;
u32 comp_humidity;
@@ -633,13 +635,13 @@ static int bme680_read_humid(struct bme680_data *data,
return ret;
ret = regmap_bulk_read(data->regmap, BME680_REG_HUMIDITY_MSB,
- &tmp, sizeof(tmp));
+ &data->be16, BME680_HUMID_NUM_BYTES);
if (ret < 0) {
dev_err(dev, "failed to read humidity\n");
return ret;
}
- adc_humidity = be16_to_cpu(tmp);
+ adc_humidity = be16_to_cpu(data->be16);
if (adc_humidity == BME680_MEAS_SKIPPED) {
/* reading was skipped */
dev_err(dev, "reading humidity skipped\n");
@@ -657,8 +659,6 @@ static int bme680_read_gas(struct bme680_data *data,
{
struct device *dev = regmap_get_device(data->regmap);
int ret;
- __be16 tmp = 0;
- unsigned int check;
u16 adc_gas_res, gas_regs_val;
u8 gas_range;
@@ -676,19 +676,19 @@ static int bme680_read_gas(struct bme680_data *data,
bme680_wait_for_eoc(data);
- ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check);
- if (check & BME680_GAS_MEAS_BIT) {
+ ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &data->check);
+ if (data->check & BME680_GAS_MEAS_BIT) {
dev_err(dev, "gas measurement incomplete\n");
return -EBUSY;
}
ret = regmap_bulk_read(data->regmap, BME680_REG_GAS_MSB,
- &tmp, sizeof(tmp));
+ &data->be16, BME680_GAS_NUM_BYTES);
if (ret < 0) {
dev_err(dev, "failed to read gas resistance\n");
return ret;
}
- gas_regs_val = be16_to_cpu(tmp);
+ gas_regs_val = be16_to_cpu(data->be16);
adc_gas_res = gas_regs_val >> BME680_ADC_GAS_RES_SHIFT;
/*
@@ -817,7 +817,6 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
{
struct iio_dev *indio_dev;
struct bme680_data *data;
- unsigned int val;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
@@ -848,15 +847,15 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
return ret;
}
- ret = regmap_read(regmap, BME680_REG_CHIP_ID, &val);
+ ret = regmap_read(regmap, BME680_REG_CHIP_ID, &data->check);
if (ret < 0) {
dev_err(dev, "Error reading chip ID\n");
return ret;
}
- if (val != BME680_CHIP_ID_VAL) {
+ if (data->check != BME680_CHIP_ID_VAL) {
dev_err(dev, "Wrong chip ID, got %x expected %x\n",
- val, BME680_CHIP_ID_VAL);
+ data->check, BME680_CHIP_ID_VAL);
return -ENODEV;
}
--
2.25.1
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