iio: Add driver for Infineon DPS310
The DPS310 is a temperature and pressure sensor. It can be accessed over i2c and SPI, but this driver only supports polling over i2c. Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Joel Stanley
Jonathan Cameron
parent
bc4054b55f
commit
ba6ec48e76
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@ -7761,6 +7761,12 @@ W: http://industrypack.sourceforge.net
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S: Maintained
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F: drivers/ipack/
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INFINEON DPS310 Driver
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M: Eddie James <eajames@linux.ibm.com>
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L: linux-iio@vger.kernel.org
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F: drivers/iio/pressure/dps310.c
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S: Maintained
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INFINIBAND SUBSYSTEM
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M: Doug Ledford <dledford@redhat.com>
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M: Jason Gunthorpe <jgg@mellanox.com>
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@ -52,6 +52,17 @@ config IIO_CROS_EC_BARO
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To compile this driver as a module, choose M here: the module
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will be called cros_ec_baro.
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config DPS310
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tristate "Infineon DPS310 pressure and temperature sensor"
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depends on I2C
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select REGMAP_I2C
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help
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Support for the Infineon DPS310 digital barometric pressure sensor.
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It can be accessed over I2C bus.
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This driver can also be built as a module. If so, the module will be
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called dps310.
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config HID_SENSOR_PRESS
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depends on HID_SENSOR_HUB
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select IIO_BUFFER
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@ -9,6 +9,7 @@ obj-$(CONFIG_BMP280) += bmp280.o
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bmp280-objs := bmp280-core.o bmp280-regmap.o
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obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
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obj-$(CONFIG_BMP280_SPI) += bmp280-spi.o
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obj-$(CONFIG_DPS310) += dps310.o
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obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o
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obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
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obj-$(CONFIG_HP03) += hp03.o
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468
drivers/iio/pressure/dps310.c
Normal file
468
drivers/iio/pressure/dps310.c
Normal file
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@ -0,0 +1,468 @@
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// SPDX-License-Identifier: GPL-2.0+
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// Copyright IBM Corp 2019
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/*
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* The DPS310 is a barometric pressure and temperature sensor.
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* Currently only reading a single temperature is supported by
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* this driver.
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*
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* https://www.infineon.com/dgdl/?fileId=5546d462576f34750157750826c42242
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*
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* Temperature calculation:
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* c0 * 0.5 + c1 * T_raw / kT °C
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*
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* TODO:
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* - Pressure sensor readings
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* - Optionally support the FIFO
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*/
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define DPS310_DEV_NAME "dps310"
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#define DPS310_PRS_B0 0x00
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#define DPS310_PRS_B1 0x01
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#define DPS310_PRS_B2 0x02
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#define DPS310_TMP_B0 0x03
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#define DPS310_TMP_B1 0x04
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#define DPS310_TMP_B2 0x05
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#define DPS310_PRS_CFG 0x06
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#define DPS310_TMP_CFG 0x07
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#define DPS310_TMP_RATE_BITS GENMASK(6, 4)
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#define DPS310_TMP_PRC_BITS GENMASK(3, 0)
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#define DPS310_TMP_EXT BIT(7)
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#define DPS310_MEAS_CFG 0x08
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#define DPS310_MEAS_CTRL_BITS GENMASK(2, 0)
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#define DPS310_PRS_EN BIT(0)
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#define DPS310_TEMP_EN BIT(1)
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#define DPS310_BACKGROUND BIT(2)
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#define DPS310_PRS_RDY BIT(4)
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#define DPS310_TMP_RDY BIT(5)
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#define DPS310_SENSOR_RDY BIT(6)
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#define DPS310_COEF_RDY BIT(7)
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#define DPS310_CFG_REG 0x09
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#define DPS310_INT_HL BIT(7)
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#define DPS310_TMP_SHIFT_EN BIT(3)
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#define DPS310_PRS_SHIFT_EN BIT(4)
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#define DPS310_FIFO_EN BIT(5)
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#define DPS310_SPI_EN BIT(6)
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#define DPS310_RESET 0x0c
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#define DPS310_RESET_MAGIC 0x09
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#define DPS310_COEF_BASE 0x10
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#define DPS310_COEF_SRC 0x28
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/* Make sure sleep time is <= 20ms for usleep_range */
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#define DPS310_POLL_SLEEP_US(t) min(20000, (t) / 8)
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/* Silently handle error in rate value here */
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#define DPS310_POLL_TIMEOUT_US(rc) ((rc) <= 0 ? 1000000 : 1000000 / (rc))
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#define DPS310_PRS_BASE DPS310_PRS_B0
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#define DPS310_TMP_BASE DPS310_TMP_B0
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/*
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* These values (defined in the spec) indicate how to scale the raw register
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* values for each level of precision available.
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*/
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static const int scale_factors[] = {
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524288,
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1572864,
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3670016,
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7864320,
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253952,
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516096,
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1040384,
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2088960,
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};
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struct dps310_data {
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struct i2c_client *client;
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struct regmap *regmap;
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struct mutex lock; /* Lock for sequential HW access functions */
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s32 c0, c1;
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s32 temp_raw;
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};
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static const struct iio_chan_spec dps310_channels[] = {
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_PROCESSED),
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},
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};
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/* To be called after checking the COEF_RDY bit in MEAS_CFG */
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static int dps310_get_temp_coef(struct dps310_data *data)
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{
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int rc;
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u8 coef[3];
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u32 c0, c1;
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/*
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* Read temperature calibration coefficients c0 and c1 from the
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* COEF register. The numbers are 12-bit 2's compliment numbers
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*/
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rc = regmap_bulk_read(data->regmap, DPS310_COEF_BASE, coef,
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sizeof(coef));
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if (rc < 0)
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return rc;
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c0 = (coef[0] << 4) | (coef[1] >> 4);
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data->c0 = sign_extend32(c0, 11);
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c1 = ((coef[1] & GENMASK(3, 0)) << 8) | coef[2];
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data->c1 = sign_extend32(c1, 11);
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return 0;
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}
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static int dps310_get_temp_precision(struct dps310_data *data)
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{
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int rc;
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int val;
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rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val);
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if (rc < 0)
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return rc;
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/*
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* Scale factor is bottom 4 bits of the register, but 1111 is
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* reserved so just grab bottom three
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*/
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return BIT(val & GENMASK(2, 0));
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}
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/* Called with lock held */
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static int dps310_set_temp_precision(struct dps310_data *data, int val)
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{
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int rc;
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u8 shift_en;
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if (val < 0 || val > 128)
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return -EINVAL;
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shift_en = val >= 16 ? DPS310_TMP_SHIFT_EN : 0;
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rc = regmap_write_bits(data->regmap, DPS310_CFG_REG,
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DPS310_TMP_SHIFT_EN, shift_en);
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if (rc)
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return rc;
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return regmap_update_bits(data->regmap, DPS310_TMP_CFG,
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DPS310_TMP_PRC_BITS, ilog2(val));
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}
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/* Called with lock held */
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static int dps310_set_temp_samp_freq(struct dps310_data *data, int freq)
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{
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u8 val;
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if (freq < 0 || freq > 128)
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return -EINVAL;
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val = ilog2(freq) << 4;
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return regmap_update_bits(data->regmap, DPS310_TMP_CFG,
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DPS310_TMP_RATE_BITS, val);
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}
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static int dps310_get_temp_samp_freq(struct dps310_data *data)
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{
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int rc;
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int val;
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rc = regmap_read(data->regmap, DPS310_TMP_CFG, &val);
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if (rc < 0)
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return rc;
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return BIT((val & DPS310_TMP_RATE_BITS) >> 4);
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}
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static int dps310_get_temp_k(struct dps310_data *data)
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{
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int rc = dps310_get_temp_precision(data);
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if (rc < 0)
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return rc;
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return scale_factors[ilog2(rc)];
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}
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static int dps310_read_temp(struct dps310_data *data)
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{
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int rc;
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int rate;
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int ready;
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int timeout;
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s32 raw;
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u8 val[3];
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if (mutex_lock_interruptible(&data->lock))
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return -EINTR;
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rate = dps310_get_temp_samp_freq(data);
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timeout = DPS310_POLL_TIMEOUT_US(rate);
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/* Poll for sensor readiness; base the timeout upon the sample rate. */
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rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready,
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ready & DPS310_TMP_RDY,
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DPS310_POLL_SLEEP_US(timeout), timeout);
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if (rc < 0)
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goto done;
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rc = regmap_bulk_read(data->regmap, DPS310_TMP_BASE, val, sizeof(val));
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if (rc < 0)
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goto done;
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raw = (val[0] << 16) | (val[1] << 8) | val[2];
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data->temp_raw = sign_extend32(raw, 23);
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done:
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mutex_unlock(&data->lock);
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return rc;
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}
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static bool dps310_is_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case DPS310_PRS_CFG:
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case DPS310_TMP_CFG:
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case DPS310_MEAS_CFG:
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case DPS310_CFG_REG:
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case DPS310_RESET:
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return true;
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default:
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return false;
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}
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}
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static bool dps310_is_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case DPS310_PRS_B0:
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case DPS310_PRS_B1:
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case DPS310_PRS_B2:
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case DPS310_TMP_B0:
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case DPS310_TMP_B1:
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case DPS310_TMP_B2:
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case DPS310_MEAS_CFG:
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return true;
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default:
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return false;
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}
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}
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static int dps310_write_raw(struct iio_dev *iio,
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struct iio_chan_spec const *chan, int val,
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int val2, long mask)
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{
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int rc;
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struct dps310_data *data = iio_priv(iio);
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if (chan->type != IIO_TEMP)
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return -EINVAL;
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if (mutex_lock_interruptible(&data->lock))
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return -EINTR;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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rc = dps310_set_temp_samp_freq(data, val);
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break;
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
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rc = dps310_set_temp_precision(data, val);
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break;
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default:
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rc = -EINVAL;
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break;
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}
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mutex_unlock(&data->lock);
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return rc;
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}
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static int dps310_calculate_temp(struct dps310_data *data)
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{
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s64 c0;
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s64 t;
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int kt = dps310_get_temp_k(data);
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if (kt < 0)
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return kt;
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/* Obtain inverse-scaled offset */
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c0 = div_s64((s64)kt * (s64)data->c0, 2);
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/* Add the offset to the unscaled temperature */
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t = c0 + ((s64)data->temp_raw * (s64)data->c1);
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/* Convert to milliCelsius and scale the temperature */
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return (int)div_s64(t * 1000LL, kt);
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}
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static int dps310_read_raw(struct iio_dev *iio,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct dps310_data *data = iio_priv(iio);
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int rc;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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rc = dps310_get_temp_samp_freq(data);
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if (rc < 0)
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return rc;
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*val = rc;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_PROCESSED:
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rc = dps310_read_temp(data);
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if (rc)
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return rc;
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rc = dps310_calculate_temp(data);
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if (rc < 0)
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return rc;
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*val = rc;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
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rc = dps310_get_temp_precision(data);
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if (rc < 0)
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return rc;
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*val = rc;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static void dps310_reset(void *action_data)
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{
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struct dps310_data *data = action_data;
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regmap_write(data->regmap, DPS310_RESET, DPS310_RESET_MAGIC);
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}
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static const struct regmap_config dps310_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.writeable_reg = dps310_is_writeable_reg,
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.volatile_reg = dps310_is_volatile_reg,
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.cache_type = REGCACHE_RBTREE,
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.max_register = DPS310_COEF_SRC,
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};
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static const struct iio_info dps310_info = {
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.read_raw = dps310_read_raw,
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.write_raw = dps310_write_raw,
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};
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static int dps310_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct dps310_data *data;
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struct iio_dev *iio;
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int rc, ready;
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iio = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!iio)
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return -ENOMEM;
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data = iio_priv(iio);
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data->client = client;
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mutex_init(&data->lock);
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iio->dev.parent = &client->dev;
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iio->name = id->name;
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iio->channels = dps310_channels;
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iio->num_channels = ARRAY_SIZE(dps310_channels);
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iio->info = &dps310_info;
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iio->modes = INDIO_DIRECT_MODE;
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data->regmap = devm_regmap_init_i2c(client, &dps310_regmap_config);
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if (IS_ERR(data->regmap))
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return PTR_ERR(data->regmap);
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/* Register to run the device reset when the device is removed */
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rc = devm_add_action_or_reset(&client->dev, dps310_reset, data);
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if (rc)
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return rc;
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/*
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* Set up external (MEMS) temperature sensor in single sample, one
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* measurement per second mode
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*/
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rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT);
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if (rc < 0)
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return rc;
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/* Temp shift is disabled when PRC <= 8 */
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rc = regmap_write_bits(data->regmap, DPS310_CFG_REG,
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DPS310_TMP_SHIFT_EN, 0);
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if (rc < 0)
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return rc;
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/* MEAS_CFG doesn't update correctly unless first written with 0 */
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rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG,
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DPS310_MEAS_CTRL_BITS, 0);
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if (rc < 0)
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return rc;
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/* Turn on temperature measurement in the background */
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rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG,
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DPS310_MEAS_CTRL_BITS,
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DPS310_TEMP_EN | DPS310_BACKGROUND);
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if (rc < 0)
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return rc;
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/*
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* Calibration coefficients required for reporting temperature.
|
||||
* They are available 40ms after the device has started
|
||||
*/
|
||||
rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready,
|
||||
ready & DPS310_COEF_RDY, 10000, 40000);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
|
||||
rc = dps310_get_temp_coef(data);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
|
||||
rc = devm_iio_device_register(&client->dev, iio);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
i2c_set_clientdata(client, iio);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id dps310_id[] = {
|
||||
{ DPS310_DEV_NAME, 0 },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, dps310_id);
|
||||
|
||||
static struct i2c_driver dps310_driver = {
|
||||
.driver = {
|
||||
.name = DPS310_DEV_NAME,
|
||||
},
|
||||
.probe = dps310_probe,
|
||||
.id_table = dps310_id,
|
||||
};
|
||||
module_i2c_driver(dps310_driver);
|
||||
|
||||
MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>");
|
||||
MODULE_DESCRIPTION("Infineon DPS310 pressure and temperature sensor");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user