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Message-ID: <CADFWO8HOb4zY7rPsCxWe2nvrzd8FjVNw0k8=8s4yB7C_BwS0ig@mail.gmail.com>
Date: Tue, 16 Jan 2024 16:24:56 +0100
From: Petar Stoykov <pd.pstoykov@...il.com>
To: linux-iio@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh+dt@...nel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Angel Iglesias <ang.iglesiasg@...il.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH 2/3] iio: pressure: Add driver for Sensirion SDP500
Sensirion SDP500 is a digital differential pressure sensor. The sensor is
accessed over I2C.
Signed-off-by: Petar Stoykov <pd.pstoykov@...il.com>
---
drivers/iio/pressure/Kconfig | 9 ++
drivers/iio/pressure/Makefile | 1 +
drivers/iio/pressure/sdp500.c | 201 ++++++++++++++++++++++++++++++++++
3 files changed, 211 insertions(+)
create mode 100644 drivers/iio/pressure/sdp500.c
diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index 95efa32e4289..5debdfbd5324 100644
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -212,6 +212,15 @@ config MS5637
This driver can also be built as a module. If so, the module will
be called ms5637.
+config SDP500
+ tristate "Sensirion SDP500 differential pressure sensor I2C driver"
+ depends on I2C
+ help
+ Say Y here to build support for Sensirion SDP500 differential pressure
+ sensor I2C driver.
+ To compile this driver as a module, choose M here: the core module
+ will be called sdp500.
+
config IIO_ST_PRESS
tristate "STMicroelectronics pressure sensor Driver"
depends on (I2C || SPI_MASTER) && SYSFS
diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
index 436aec7e65f3..489ef7b7befa 100644
--- a/drivers/iio/pressure/Makefile
+++ b/drivers/iio/pressure/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_MS5611) += ms5611_core.o
obj-$(CONFIG_MS5611_I2C) += ms5611_i2c.o
obj-$(CONFIG_MS5611_SPI) += ms5611_spi.o
obj-$(CONFIG_MS5637) += ms5637.o
+obj-$(CONFIG_SDP500) += sdp500.o
obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o
st_pressure-y := st_pressure_core.o
st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o
diff --git a/drivers/iio/pressure/sdp500.c b/drivers/iio/pressure/sdp500.c
new file mode 100644
index 000000000000..bc492ef3ef3e
--- /dev/null
+++ b/drivers/iio/pressure/sdp500.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+
+#define SDP500_CRC8_POLYNOMIAL 0x31 // x8 + x5 + x4 + 1 (normalized to 0x31)
+#define SDP500_READ_SIZE 3
+
+#define SDP500_SCALE_FACTOR 60
+
+#define SDP500_I2C_START_MEAS 0xF1
+
+#define sdp500_err(idev, fmt, ...) \
+ dev_err(idev->dev.parent, fmt "\n", ##__VA_ARGS__)
+
+#define sdp500_dbg(idev, fmt, ...) \
+ dev_dbg(idev->dev.parent, fmt "\n", ##__VA_ARGS__)
+
+#define sdp500_info(idev, fmt, ...) \
+ dev_info(idev->dev.parent, fmt "\n", ##__VA_ARGS__)
+
+struct sdp500_data {
+ struct device *dev;
+};
+
+uint8_t calculate_crc8(uint8_t *data, uint32_t len, uint8_t poly)
+{
+ uint8_t count = 0;
+ uint8_t value = 0;
+ uint8_t temp = 0;
+
+ while (len--) {
+ temp = *(data);
+ data++;
+ value ^= temp;
+ for (count = 0; count < BITS_PER_BYTE; count++) {
+ if (value & 0x80)
+ value = (value << 1) ^ poly;
+ else
+ value = value << 1;
+ }
+ }
+
+ return value;
+}
+
+static int sdp500_xfer(struct sdp500_data *data, u8 *txbuf, size_t txsize,
+ u8 *rxbuf, size_t rxsize, const struct iio_dev *indio_dev)
+{
+ struct i2c_client *client = to_i2c_client(data->dev);
+ int ret;
+
+ ret = i2c_master_send(client, txbuf, txsize);
+ if (ret < 0) {
+ sdp500_err(indio_dev, "Failed to send data");
+ return ret;
+ }
+ if (ret != txsize) {
+ sdp500_err(indio_dev, "Data is sent wrongly");
+ return -EIO;
+ }
+
+ if (!rxsize)
+ return 0;
+
+ ret = i2c_master_recv(client, rxbuf, rxsize);
+ if (ret < 0) {
+ sdp500_err(indio_dev, "Failed to receive data");
+ return ret;
+ }
+ if (ret != rxsize) {
+ sdp500_err(indio_dev, "Data is received wrongly");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int sdp500_start_measurement(struct sdp500_data *data, const
struct iio_dev *indio_dev)
+{
+ u8 txbuf = SDP500_I2C_START_MEAS;
+
+ return sdp500_xfer(data, &txbuf, 1, NULL, 0, indio_dev);
+}
+
+static const struct iio_chan_spec sdp500_channels[] = {
+ {
+ .type = IIO_PRESSURE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ },
+};
+
+static int sdp500_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ int ret = -EINVAL;
+ u8 rxbuf[SDP500_READ_SIZE];
+ u8 rec_crc, calculated_crc;
+ s16 dec_value;
+ struct sdp500_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ sdp500_xfer(data, NULL, 0, rxbuf, SDP500_READ_SIZE, indio_dev);
+ rec_crc = rxbuf[2];
+ calculated_crc = calculate_crc8(rxbuf, SDP500_READ_SIZE - 1,
+ SDP500_CRC8_POLYNOMIAL);
+ if (rec_crc != calculated_crc) {
+ sdp500_err(indio_dev, "calculated crc = 0x%.2X but
received 0x%.2X",
+ calculated_crc, rec_crc);
+ return -EIO;
+ }
+
+ dec_value = ((rxbuf[0] << 8) & 0xFF00) | rxbuf[1];
+ sdp500_dbg(indio_dev, "dec value = %d", dec_value);
+
+ *val = dec_value;
+ *val2 = SDP500_SCALE_FACTOR;
+ ret = IIO_VAL_FRACTIONAL;
+ break;
+ }
+ return ret;
+}
+
+static const struct iio_info sdp500_info = {
+ .read_raw = &sdp500_read_raw,
+};
+
+static int sdp500_probe(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev;
+ struct sdp500_data *data;
+ struct device *dev = &client->dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev) {
+ dev_err(dev->parent, "Failed to allocate iio device\n");
+ return -ENOMEM;
+ }
+
+ i2c_set_clientdata(client, indio_dev);
+
+ data = iio_priv(indio_dev);
+ data->dev = dev;
+
+ indio_dev->dev.parent = dev;
+ indio_dev->name = client->name;
+ indio_dev->channels = sdp500_channels;
+ indio_dev->info = &sdp500_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->num_channels = ARRAY_SIZE(sdp500_channels);
+
+ ret = sdp500_start_measurement(data, indio_dev);
+ if (ret) {
+ sdp500_err(indio_dev, "Failed to start measurement");
+ return ret;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0) {
+ sdp500_err(indio_dev, "Failed to register indio_dev");
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id sdp500_id[] = {
+ { "sdp500" },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, sdp500_id);
+
+static void sdp500_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(&client->dev);
+
+ iio_device_unregister(indio_dev);
+}
+
+static const struct of_device_id sdp500_of_match[] = {
+ { .compatible = "sensirion,sdp500" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sdp500_of_match);
+
+static struct i2c_driver sdp500_driver = {
+ .driver = {
+ .name = "sensirion,sdp500",
+ .of_match_table = sdp500_of_match,
+ },
+ .probe = sdp500_probe,
+ .remove = sdp500_remove,
+ .id_table = sdp500_id,
+};
+module_i2c_driver(sdp500_driver);
+
+MODULE_AUTHOR("Thomas Sioutas <thomas.sioutas@...drive-technologies.com>");
+MODULE_DESCRIPTION("Driver for Sensirion SDP500 differential pressure sensor");
+MODULE_LICENSE("GPL");
--
2.30.2
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