iio: humidity: add support to hts221 rh/temp combo device
Add support to STM HTS221 humidity + temperature sensor http://www.st.com/resource/en/datasheet/hts221.pdf - continuous mode support - i2c support - spi support - trigger mode support Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lorenzo Bianconi
Jonathan Cameron
parent
4aee987380
commit
e4a70e3e7d
@ -34,6 +34,28 @@ config HDC100X
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To compile this driver as a module, choose M here: the module
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will be called hdc100x.
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config HTS221
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tristate "STMicroelectronics HTS221 sensor Driver"
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depends on (I2C || SPI)
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select IIO_BUFFER
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select IIO_TRIGGERED_BUFFER
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select HTS221_I2C if (I2C)
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select HTS221_SPI if (SPI_MASTER)
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help
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Say yes here to build support for STMicroelectronics HTS221
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temperature-humidity sensor
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To compile this driver as a module, choose M here: the module
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will be called hts221.
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config HTS221_I2C
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tristate
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depends on HTS221
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config HTS221_SPI
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tristate
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depends on HTS221
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config HTU21
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tristate "Measurement Specialties HTU21 humidity & temperature sensor"
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depends on I2C
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@ -5,6 +5,13 @@
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obj-$(CONFIG_AM2315) += am2315.o
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obj-$(CONFIG_DHT11) += dht11.o
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obj-$(CONFIG_HDC100X) += hdc100x.o
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hts221-y := hts221_core.o \
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hts221_buffer.o
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obj-$(CONFIG_HTS221) += hts221.o
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obj-$(CONFIG_HTS221_I2C) += hts221_i2c.o
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obj-$(CONFIG_HTS221_SPI) += hts221_spi.o
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obj-$(CONFIG_HTU21) += htu21.o
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obj-$(CONFIG_SI7005) += si7005.o
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obj-$(CONFIG_SI7020) += si7020.o
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73
drivers/iio/humidity/hts221.h
Normal file
73
drivers/iio/humidity/hts221.h
Normal file
@ -0,0 +1,73 @@
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/*
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* STMicroelectronics hts221 sensor driver
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*
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* Copyright 2016 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#ifndef HTS221_H
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#define HTS221_H
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#define HTS221_DEV_NAME "hts221"
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#include <linux/iio/iio.h>
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#define HTS221_RX_MAX_LENGTH 8
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#define HTS221_TX_MAX_LENGTH 8
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#define HTS221_DATA_SIZE 2
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struct hts221_transfer_buffer {
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u8 rx_buf[HTS221_RX_MAX_LENGTH];
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u8 tx_buf[HTS221_TX_MAX_LENGTH] ____cacheline_aligned;
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};
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struct hts221_transfer_function {
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int (*read)(struct device *dev, u8 addr, int len, u8 *data);
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int (*write)(struct device *dev, u8 addr, int len, u8 *data);
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};
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#define HTS221_AVG_DEPTH 8
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struct hts221_avg_avl {
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u16 avg;
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u8 val;
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};
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enum hts221_sensor_type {
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HTS221_SENSOR_H,
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HTS221_SENSOR_T,
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HTS221_SENSOR_MAX,
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};
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struct hts221_sensor {
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u8 cur_avg_idx;
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int slope, b_gen;
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};
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struct hts221_hw {
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const char *name;
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struct device *dev;
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struct mutex lock;
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struct iio_trigger *trig;
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int irq;
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struct hts221_sensor sensors[HTS221_SENSOR_MAX];
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u8 odr;
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const struct hts221_transfer_function *tf;
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struct hts221_transfer_buffer tb;
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};
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int hts221_config_drdy(struct hts221_hw *hw, bool enable);
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int hts221_probe(struct iio_dev *iio_dev);
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int hts221_power_on(struct hts221_hw *hw);
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int hts221_power_off(struct hts221_hw *hw);
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int hts221_allocate_buffers(struct hts221_hw *hw);
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int hts221_allocate_trigger(struct hts221_hw *hw);
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#endif /* HTS221_H */
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169
drivers/iio/humidity/hts221_buffer.c
Normal file
169
drivers/iio/humidity/hts221_buffer.c
Normal file
@ -0,0 +1,169 @@
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/*
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* STMicroelectronics hts221 sensor driver
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*
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* Copyright 2016 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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#include <linux/interrupt.h>
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#include <linux/iio/events.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/buffer.h>
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#include "hts221.h"
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#define HTS221_REG_STATUS_ADDR 0x27
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#define HTS221_RH_DRDY_MASK BIT(1)
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#define HTS221_TEMP_DRDY_MASK BIT(0)
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static int hts221_trig_set_state(struct iio_trigger *trig, bool state)
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{
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struct iio_dev *iio_dev = iio_trigger_get_drvdata(trig);
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struct hts221_hw *hw = iio_priv(iio_dev);
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return hts221_config_drdy(hw, state);
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}
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static const struct iio_trigger_ops hts221_trigger_ops = {
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.owner = THIS_MODULE,
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.set_trigger_state = hts221_trig_set_state,
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};
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static irqreturn_t hts221_trigger_handler_thread(int irq, void *private)
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{
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struct hts221_hw *hw = (struct hts221_hw *)private;
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u8 status;
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int err;
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err = hw->tf->read(hw->dev, HTS221_REG_STATUS_ADDR, sizeof(status),
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&status);
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if (err < 0)
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return IRQ_HANDLED;
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/*
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* H_DA bit (humidity data available) is routed to DRDY line.
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* Humidity sample is computed after temperature one.
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* Here we can assume data channels are both available if H_DA bit
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* is set in status register
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*/
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if (!(status & HTS221_RH_DRDY_MASK))
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return IRQ_NONE;
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iio_trigger_poll_chained(hw->trig);
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return IRQ_HANDLED;
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}
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int hts221_allocate_trigger(struct hts221_hw *hw)
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{
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struct iio_dev *iio_dev = iio_priv_to_dev(hw);
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unsigned long irq_type;
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int err;
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irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));
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switch (irq_type) {
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case IRQF_TRIGGER_HIGH:
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case IRQF_TRIGGER_RISING:
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break;
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default:
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dev_info(hw->dev,
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"mode %lx unsupported, using IRQF_TRIGGER_RISING\n",
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irq_type);
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irq_type = IRQF_TRIGGER_RISING;
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break;
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}
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err = devm_request_threaded_irq(hw->dev, hw->irq, NULL,
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hts221_trigger_handler_thread,
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irq_type | IRQF_ONESHOT,
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hw->name, hw);
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if (err) {
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dev_err(hw->dev, "failed to request trigger irq %d\n",
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hw->irq);
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return err;
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}
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hw->trig = devm_iio_trigger_alloc(hw->dev, "%s-trigger",
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iio_dev->name);
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if (!hw->trig)
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return -ENOMEM;
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iio_trigger_set_drvdata(hw->trig, iio_dev);
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hw->trig->ops = &hts221_trigger_ops;
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hw->trig->dev.parent = hw->dev;
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iio_dev->trig = iio_trigger_get(hw->trig);
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return devm_iio_trigger_register(hw->dev, hw->trig);
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}
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static int hts221_buffer_preenable(struct iio_dev *iio_dev)
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{
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return hts221_power_on(iio_priv(iio_dev));
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}
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static int hts221_buffer_postdisable(struct iio_dev *iio_dev)
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{
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return hts221_power_off(iio_priv(iio_dev));
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}
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static const struct iio_buffer_setup_ops hts221_buffer_ops = {
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.preenable = hts221_buffer_preenable,
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.postenable = iio_triggered_buffer_postenable,
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.predisable = iio_triggered_buffer_predisable,
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.postdisable = hts221_buffer_postdisable,
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};
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static irqreturn_t hts221_buffer_handler_thread(int irq, void *p)
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{
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u8 buffer[ALIGN(2 * HTS221_DATA_SIZE, sizeof(s64)) + sizeof(s64)];
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struct iio_poll_func *pf = p;
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struct iio_dev *iio_dev = pf->indio_dev;
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struct hts221_hw *hw = iio_priv(iio_dev);
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struct iio_chan_spec const *ch;
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int err;
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/* humidity data */
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ch = &iio_dev->channels[HTS221_SENSOR_H];
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err = hw->tf->read(hw->dev, ch->address, HTS221_DATA_SIZE,
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buffer);
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if (err < 0)
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goto out;
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/* temperature data */
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ch = &iio_dev->channels[HTS221_SENSOR_T];
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err = hw->tf->read(hw->dev, ch->address, HTS221_DATA_SIZE,
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buffer + HTS221_DATA_SIZE);
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if (err < 0)
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goto out;
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iio_push_to_buffers_with_timestamp(iio_dev, buffer,
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iio_get_time_ns(iio_dev));
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out:
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iio_trigger_notify_done(hw->trig);
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return IRQ_HANDLED;
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}
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int hts221_allocate_buffers(struct hts221_hw *hw)
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{
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return devm_iio_triggered_buffer_setup(hw->dev, iio_priv_to_dev(hw),
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NULL, hts221_buffer_handler_thread,
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&hts221_buffer_ops);
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}
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MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics hts221 buffer driver");
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MODULE_LICENSE("GPL v2");
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687
drivers/iio/humidity/hts221_core.c
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687
drivers/iio/humidity/hts221_core.c
Normal file
@ -0,0 +1,687 @@
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/*
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* STMicroelectronics hts221 sensor driver
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*
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* Copyright 2016 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/iio/sysfs.h>
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#include <linux/delay.h>
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#include <asm/unaligned.h>
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#include "hts221.h"
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#define HTS221_REG_WHOAMI_ADDR 0x0f
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#define HTS221_REG_WHOAMI_VAL 0xbc
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#define HTS221_REG_CNTRL1_ADDR 0x20
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#define HTS221_REG_CNTRL2_ADDR 0x21
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#define HTS221_REG_CNTRL3_ADDR 0x22
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#define HTS221_REG_AVG_ADDR 0x10
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#define HTS221_REG_H_OUT_L 0x28
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#define HTS221_REG_T_OUT_L 0x2a
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#define HTS221_HUMIDITY_AVG_MASK 0x07
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#define HTS221_TEMP_AVG_MASK 0x38
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#define HTS221_ODR_MASK 0x87
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#define HTS221_BDU_MASK BIT(2)
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#define HTS221_DRDY_MASK BIT(2)
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#define HTS221_ENABLE_SENSOR BIT(7)
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#define HTS221_HUMIDITY_AVG_4 0x00 /* 0.4 %RH */
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#define HTS221_HUMIDITY_AVG_8 0x01 /* 0.3 %RH */
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#define HTS221_HUMIDITY_AVG_16 0x02 /* 0.2 %RH */
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#define HTS221_HUMIDITY_AVG_32 0x03 /* 0.15 %RH */
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#define HTS221_HUMIDITY_AVG_64 0x04 /* 0.1 %RH */
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#define HTS221_HUMIDITY_AVG_128 0x05 /* 0.07 %RH */
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#define HTS221_HUMIDITY_AVG_256 0x06 /* 0.05 %RH */
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#define HTS221_HUMIDITY_AVG_512 0x07 /* 0.03 %RH */
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#define HTS221_TEMP_AVG_2 0x00 /* 0.08 degC */
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#define HTS221_TEMP_AVG_4 0x08 /* 0.05 degC */
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#define HTS221_TEMP_AVG_8 0x10 /* 0.04 degC */
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#define HTS221_TEMP_AVG_16 0x18 /* 0.03 degC */
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#define HTS221_TEMP_AVG_32 0x20 /* 0.02 degC */
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#define HTS221_TEMP_AVG_64 0x28 /* 0.015 degC */
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#define HTS221_TEMP_AVG_128 0x30 /* 0.01 degC */
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#define HTS221_TEMP_AVG_256 0x38 /* 0.007 degC */
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/* calibration registers */
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#define HTS221_REG_0RH_CAL_X_H 0x36
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#define HTS221_REG_1RH_CAL_X_H 0x3a
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#define HTS221_REG_0RH_CAL_Y_H 0x30
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#define HTS221_REG_1RH_CAL_Y_H 0x31
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#define HTS221_REG_0T_CAL_X_L 0x3c
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#define HTS221_REG_1T_CAL_X_L 0x3e
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#define HTS221_REG_0T_CAL_Y_H 0x32
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#define HTS221_REG_1T_CAL_Y_H 0x33
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#define HTS221_REG_T1_T0_CAL_Y_H 0x35
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struct hts221_odr {
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u8 hz;
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u8 val;
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};
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struct hts221_avg {
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u8 addr;
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u8 mask;
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struct hts221_avg_avl avg_avl[HTS221_AVG_DEPTH];
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};
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static const struct hts221_odr hts221_odr_table[] = {
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{ 1, 0x01 }, /* 1Hz */
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{ 7, 0x02 }, /* 7Hz */
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{ 13, 0x03 }, /* 12.5Hz */
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};
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static const struct hts221_avg hts221_avg_list[] = {
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{
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.addr = HTS221_REG_AVG_ADDR,
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.mask = HTS221_HUMIDITY_AVG_MASK,
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.avg_avl = {
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{ 4, HTS221_HUMIDITY_AVG_4 },
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{ 8, HTS221_HUMIDITY_AVG_8 },
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{ 16, HTS221_HUMIDITY_AVG_16 },
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{ 32, HTS221_HUMIDITY_AVG_32 },
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{ 64, HTS221_HUMIDITY_AVG_64 },
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{ 128, HTS221_HUMIDITY_AVG_128 },
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{ 256, HTS221_HUMIDITY_AVG_256 },
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{ 512, HTS221_HUMIDITY_AVG_512 },
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},
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},
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{
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.addr = HTS221_REG_AVG_ADDR,
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.mask = HTS221_TEMP_AVG_MASK,
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.avg_avl = {
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{ 2, HTS221_TEMP_AVG_2 },
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{ 4, HTS221_TEMP_AVG_4 },
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{ 8, HTS221_TEMP_AVG_8 },
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{ 16, HTS221_TEMP_AVG_16 },
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{ 32, HTS221_TEMP_AVG_32 },
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{ 64, HTS221_TEMP_AVG_64 },
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{ 128, HTS221_TEMP_AVG_128 },
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{ 256, HTS221_TEMP_AVG_256 },
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},
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},
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};
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static const struct iio_chan_spec hts221_channels[] = {
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{
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.type = IIO_HUMIDITYRELATIVE,
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.address = HTS221_REG_H_OUT_L,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.scan_index = 0,
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.scan_type = {
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.sign = 's',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_LE,
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},
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},
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{
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.type = IIO_TEMP,
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.address = HTS221_REG_T_OUT_L,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.scan_index = 1,
|
||||
.scan_type = {
|
||||
.sign = 's',
|
||||
.realbits = 16,
|
||||
.storagebits = 16,
|
||||
.endianness = IIO_LE,
|
||||
},
|
||||
},
|
||||
IIO_CHAN_SOFT_TIMESTAMP(2),
|
||||
};
|
||||
|
||||
static int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask,
|
||||
u8 val)
|
||||
{
|
||||
u8 data;
|
||||
int err;
|
||||
|
||||
mutex_lock(&hw->lock);
|
||||
|
||||
err = hw->tf->read(hw->dev, addr, sizeof(data), &data);
|
||||
if (err < 0) {
|
||||
dev_err(hw->dev, "failed to read %02x register\n", addr);
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
data = (data & ~mask) | (val & mask);
|
||||
|
||||
err = hw->tf->write(hw->dev, addr, sizeof(data), &data);
|
||||
if (err < 0)
|
||||
dev_err(hw->dev, "failed to write %02x register\n", addr);
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&hw->lock);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int hts221_check_whoami(struct hts221_hw *hw)
|
||||
{
|
||||
u8 data;
|
||||
int err;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_WHOAMI_ADDR, sizeof(data),
|
||||
&data);
|
||||
if (err < 0) {
|
||||
dev_err(hw->dev, "failed to read whoami register\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
if (data != HTS221_REG_WHOAMI_VAL) {
|
||||
dev_err(hw->dev, "wrong whoami {%02x vs %02x}\n",
|
||||
data, HTS221_REG_WHOAMI_VAL);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int hts221_config_drdy(struct hts221_hw *hw, bool enable)
|
||||
{
|
||||
u8 val = enable ? BIT(2) : 0;
|
||||
int err;
|
||||
|
||||
err = hts221_write_with_mask(hw, HTS221_REG_CNTRL3_ADDR,
|
||||
HTS221_DRDY_MASK, val);
|
||||
|
||||
return err < 0 ? err : 0;
|
||||
}
|
||||
|
||||
static int hts221_update_odr(struct hts221_hw *hw, u8 odr)
|
||||
{
|
||||
int i, err;
|
||||
u8 val;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
|
||||
if (hts221_odr_table[i].hz == odr)
|
||||
break;
|
||||
|
||||
if (i == ARRAY_SIZE(hts221_odr_table))
|
||||
return -EINVAL;
|
||||
|
||||
val = HTS221_ENABLE_SENSOR | HTS221_BDU_MASK | hts221_odr_table[i].val;
|
||||
err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
|
||||
HTS221_ODR_MASK, val);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
hw->odr = odr;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hts221_update_avg(struct hts221_hw *hw,
|
||||
enum hts221_sensor_type type,
|
||||
u16 val)
|
||||
{
|
||||
int i, err;
|
||||
const struct hts221_avg *avg = &hts221_avg_list[type];
|
||||
|
||||
for (i = 0; i < HTS221_AVG_DEPTH; i++)
|
||||
if (avg->avg_avl[i].avg == val)
|
||||
break;
|
||||
|
||||
if (i == HTS221_AVG_DEPTH)
|
||||
return -EINVAL;
|
||||
|
||||
err = hts221_write_with_mask(hw, avg->addr, avg->mask,
|
||||
avg->avg_avl[i].val);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
hw->sensors[type].cur_avg_idx = i;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t hts221_sysfs_sampling_freq(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
int i;
|
||||
ssize_t len = 0;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
|
||||
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
|
||||
hts221_odr_table[i].hz);
|
||||
buf[len - 1] = '\n';
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
hts221_sysfs_rh_oversampling_avail(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
const struct hts221_avg *avg = &hts221_avg_list[HTS221_SENSOR_H];
|
||||
ssize_t len = 0;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
|
||||
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
|
||||
avg->avg_avl[i].avg);
|
||||
buf[len - 1] = '\n';
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
hts221_sysfs_temp_oversampling_avail(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
const struct hts221_avg *avg = &hts221_avg_list[HTS221_SENSOR_T];
|
||||
ssize_t len = 0;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
|
||||
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
|
||||
avg->avg_avl[i].avg);
|
||||
buf[len - 1] = '\n';
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
int hts221_power_on(struct hts221_hw *hw)
|
||||
{
|
||||
return hts221_update_odr(hw, hw->odr);
|
||||
}
|
||||
|
||||
int hts221_power_off(struct hts221_hw *hw)
|
||||
{
|
||||
u8 data[] = {0x00, 0x00};
|
||||
|
||||
return hw->tf->write(hw->dev, HTS221_REG_CNTRL1_ADDR, sizeof(data),
|
||||
data);
|
||||
}
|
||||
|
||||
static int hts221_parse_temp_caldata(struct hts221_hw *hw)
|
||||
{
|
||||
int err, *slope, *b_gen;
|
||||
s16 cal_x0, cal_x1, cal_y0, cal_y1;
|
||||
u8 cal0, cal1;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_0T_CAL_Y_H,
|
||||
sizeof(cal0), &cal0);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_T1_T0_CAL_Y_H,
|
||||
sizeof(cal1), &cal1);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_y0 = (le16_to_cpu(cal1 & 0x3) << 8) | cal0;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_1T_CAL_Y_H,
|
||||
sizeof(cal0), &cal0);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_y1 = (((cal1 & 0xc) >> 2) << 8) | cal0;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_0T_CAL_X_L, sizeof(cal_x0),
|
||||
(u8 *)&cal_x0);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_x0 = le16_to_cpu(cal_x0);
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_1T_CAL_X_L, sizeof(cal_x1),
|
||||
(u8 *)&cal_x1);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_x1 = le16_to_cpu(cal_x1);
|
||||
|
||||
slope = &hw->sensors[HTS221_SENSOR_T].slope;
|
||||
b_gen = &hw->sensors[HTS221_SENSOR_T].b_gen;
|
||||
|
||||
*slope = ((cal_y1 - cal_y0) * 8000) / (cal_x1 - cal_x0);
|
||||
*b_gen = (((s32)cal_x1 * cal_y0 - (s32)cal_x0 * cal_y1) * 1000) /
|
||||
(cal_x1 - cal_x0);
|
||||
*b_gen *= 8;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hts221_parse_rh_caldata(struct hts221_hw *hw)
|
||||
{
|
||||
int err, *slope, *b_gen;
|
||||
s16 cal_x0, cal_x1, cal_y0, cal_y1;
|
||||
u8 data;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_0RH_CAL_Y_H, sizeof(data),
|
||||
&data);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_y0 = data;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_1RH_CAL_Y_H, sizeof(data),
|
||||
&data);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_y1 = data;
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_0RH_CAL_X_H, sizeof(cal_x0),
|
||||
(u8 *)&cal_x0);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_x0 = le16_to_cpu(cal_x0);
|
||||
|
||||
err = hw->tf->read(hw->dev, HTS221_REG_1RH_CAL_X_H, sizeof(cal_x1),
|
||||
(u8 *)&cal_x1);
|
||||
if (err < 0)
|
||||
return err;
|
||||
cal_x1 = le16_to_cpu(cal_x1);
|
||||
|
||||
slope = &hw->sensors[HTS221_SENSOR_H].slope;
|
||||
b_gen = &hw->sensors[HTS221_SENSOR_H].b_gen;
|
||||
|
||||
*slope = ((cal_y1 - cal_y0) * 8000) / (cal_x1 - cal_x0);
|
||||
*b_gen = (((s32)cal_x1 * cal_y0 - (s32)cal_x0 * cal_y1) * 1000) /
|
||||
(cal_x1 - cal_x0);
|
||||
*b_gen *= 8;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hts221_get_sensor_scale(struct hts221_hw *hw,
|
||||
enum iio_chan_type ch_type,
|
||||
int *val, int *val2)
|
||||
{
|
||||
s64 tmp;
|
||||
s32 rem, div, data;
|
||||
|
||||
switch (ch_type) {
|
||||
case IIO_HUMIDITYRELATIVE:
|
||||
data = hw->sensors[HTS221_SENSOR_H].slope;
|
||||
div = (1 << 4) * 1000;
|
||||
break;
|
||||
case IIO_TEMP:
|
||||
data = hw->sensors[HTS221_SENSOR_T].slope;
|
||||
div = (1 << 6) * 1000;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
tmp = div_s64(data * 1000000000LL, div);
|
||||
tmp = div_s64_rem(tmp, 1000000000LL, &rem);
|
||||
|
||||
*val = tmp;
|
||||
*val2 = rem;
|
||||
|
||||
return IIO_VAL_INT_PLUS_NANO;
|
||||
}
|
||||
|
||||
static int hts221_get_sensor_offset(struct hts221_hw *hw,
|
||||
enum iio_chan_type ch_type,
|
||||
int *val, int *val2)
|
||||
{
|
||||
s64 tmp;
|
||||
s32 rem, div, data;
|
||||
|
||||
switch (ch_type) {
|
||||
case IIO_HUMIDITYRELATIVE:
|
||||
data = hw->sensors[HTS221_SENSOR_H].b_gen;
|
||||
div = hw->sensors[HTS221_SENSOR_H].slope;
|
||||
break;
|
||||
case IIO_TEMP:
|
||||
data = hw->sensors[HTS221_SENSOR_T].b_gen;
|
||||
div = hw->sensors[HTS221_SENSOR_T].slope;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
tmp = div_s64(data * 1000000000LL, div);
|
||||
tmp = div_s64_rem(tmp, 1000000000LL, &rem);
|
||||
|
||||
*val = tmp;
|
||||
*val2 = rem;
|
||||
|
||||
return IIO_VAL_INT_PLUS_NANO;
|
||||
}
|
||||
|
||||
static int hts221_read_oneshot(struct hts221_hw *hw, u8 addr, int *val)
|
||||
{
|
||||
u8 data[HTS221_DATA_SIZE];
|
||||
int err;
|
||||
|
||||
err = hts221_power_on(hw);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
msleep(50);
|
||||
|
||||
err = hw->tf->read(hw->dev, addr, sizeof(data), data);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
hts221_power_off(hw);
|
||||
|
||||
*val = (s16)get_unaligned_le16(data);
|
||||
|
||||
return IIO_VAL_INT;
|
||||
}
|
||||
|
||||
static int hts221_read_raw(struct iio_dev *iio_dev,
|
||||
struct iio_chan_spec const *ch,
|
||||
int *val, int *val2, long mask)
|
||||
{
|
||||
struct hts221_hw *hw = iio_priv(iio_dev);
|
||||
int ret;
|
||||
|
||||
ret = iio_device_claim_direct_mode(iio_dev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
ret = hts221_read_oneshot(hw, ch->address, val);
|
||||
break;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
ret = hts221_get_sensor_scale(hw, ch->type, val, val2);
|
||||
break;
|
||||
case IIO_CHAN_INFO_OFFSET:
|
||||
ret = hts221_get_sensor_offset(hw, ch->type, val, val2);
|
||||
break;
|
||||
case IIO_CHAN_INFO_SAMP_FREQ:
|
||||
*val = hw->odr;
|
||||
ret = IIO_VAL_INT;
|
||||
break;
|
||||
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: {
|
||||
u8 idx;
|
||||
const struct hts221_avg *avg;
|
||||
|
||||
switch (ch->type) {
|
||||
case IIO_HUMIDITYRELATIVE:
|
||||
avg = &hts221_avg_list[HTS221_SENSOR_H];
|
||||
idx = hw->sensors[HTS221_SENSOR_H].cur_avg_idx;
|
||||
*val = avg->avg_avl[idx].avg;
|
||||
ret = IIO_VAL_INT;
|
||||
break;
|
||||
case IIO_TEMP:
|
||||
avg = &hts221_avg_list[HTS221_SENSOR_T];
|
||||
idx = hw->sensors[HTS221_SENSOR_T].cur_avg_idx;
|
||||
*val = avg->avg_avl[idx].avg;
|
||||
ret = IIO_VAL_INT;
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
break;
|
||||
}
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
iio_device_release_direct_mode(iio_dev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int hts221_write_raw(struct iio_dev *iio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int val, int val2, long mask)
|
||||
{
|
||||
struct hts221_hw *hw = iio_priv(iio_dev);
|
||||
int ret;
|
||||
|
||||
ret = iio_device_claim_direct_mode(iio_dev);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_SAMP_FREQ:
|
||||
ret = hts221_update_odr(hw, val);
|
||||
break;
|
||||
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
|
||||
switch (chan->type) {
|
||||
case IIO_HUMIDITYRELATIVE:
|
||||
ret = hts221_update_avg(hw, HTS221_SENSOR_H, val);
|
||||
break;
|
||||
case IIO_TEMP:
|
||||
ret = hts221_update_avg(hw, HTS221_SENSOR_T, val);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
iio_device_release_direct_mode(iio_dev);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int hts221_validate_trigger(struct iio_dev *iio_dev,
|
||||
struct iio_trigger *trig)
|
||||
{
|
||||
struct hts221_hw *hw = iio_priv(iio_dev);
|
||||
|
||||
return hw->trig == trig ? 0 : -EINVAL;
|
||||
}
|
||||
|
||||
static IIO_DEVICE_ATTR(in_humidity_oversampling_ratio_available, S_IRUGO,
|
||||
hts221_sysfs_rh_oversampling_avail, NULL, 0);
|
||||
static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available, S_IRUGO,
|
||||
hts221_sysfs_temp_oversampling_avail, NULL, 0);
|
||||
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hts221_sysfs_sampling_freq);
|
||||
|
||||
static struct attribute *hts221_attributes[] = {
|
||||
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
|
||||
&iio_dev_attr_in_humidity_oversampling_ratio_available.dev_attr.attr,
|
||||
&iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group hts221_attribute_group = {
|
||||
.attrs = hts221_attributes,
|
||||
};
|
||||
|
||||
static const struct iio_info hts221_info = {
|
||||
.driver_module = THIS_MODULE,
|
||||
.attrs = &hts221_attribute_group,
|
||||
.read_raw = hts221_read_raw,
|
||||
.write_raw = hts221_write_raw,
|
||||
.validate_trigger = hts221_validate_trigger,
|
||||
};
|
||||
|
||||
static const unsigned long hts221_scan_masks[] = {0x3, 0x0};
|
||||
|
||||
int hts221_probe(struct iio_dev *iio_dev)
|
||||
{
|
||||
struct hts221_hw *hw = iio_priv(iio_dev);
|
||||
int err;
|
||||
u8 data;
|
||||
|
||||
mutex_init(&hw->lock);
|
||||
|
||||
err = hts221_check_whoami(hw);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
hw->odr = hts221_odr_table[0].hz;
|
||||
|
||||
iio_dev->modes = INDIO_DIRECT_MODE;
|
||||
iio_dev->dev.parent = hw->dev;
|
||||
iio_dev->available_scan_masks = hts221_scan_masks;
|
||||
iio_dev->channels = hts221_channels;
|
||||
iio_dev->num_channels = ARRAY_SIZE(hts221_channels);
|
||||
iio_dev->name = HTS221_DEV_NAME;
|
||||
iio_dev->info = &hts221_info;
|
||||
|
||||
/* configure humidity sensor */
|
||||
err = hts221_parse_rh_caldata(hw);
|
||||
if (err < 0) {
|
||||
dev_err(hw->dev, "failed to get rh calibration data\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
data = hts221_avg_list[HTS221_SENSOR_H].avg_avl[3].avg;
|
||||
err = hts221_update_avg(hw, HTS221_SENSOR_H, data);
|
||||
if (err < 0) {
|
||||
dev_err(hw->dev, "failed to set rh oversampling ratio\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
/* configure temperature sensor */
|
||||
err = hts221_parse_temp_caldata(hw);
|
||||
if (err < 0) {
|
||||
dev_err(hw->dev,
|
||||
"failed to get temperature calibration data\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
data = hts221_avg_list[HTS221_SENSOR_T].avg_avl[3].avg;
|
||||
err = hts221_update_avg(hw, HTS221_SENSOR_T, data);
|
||||
if (err < 0) {
|
||||
dev_err(hw->dev,
|
||||
"failed to set temperature oversampling ratio\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
if (hw->irq > 0) {
|
||||
err = hts221_allocate_buffers(hw);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
err = hts221_allocate_trigger(hw);
|
||||
if (err)
|
||||
return err;
|
||||
}
|
||||
|
||||
return devm_iio_device_register(hw->dev, iio_dev);
|
||||
}
|
||||
EXPORT_SYMBOL(hts221_probe);
|
||||
|
||||
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics hts221 sensor driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
110
drivers/iio/humidity/hts221_i2c.c
Normal file
110
drivers/iio/humidity/hts221_i2c.c
Normal file
@ -0,0 +1,110 @@
|
||||
/*
|
||||
* STMicroelectronics hts221 i2c driver
|
||||
*
|
||||
* Copyright 2016 STMicroelectronics Inc.
|
||||
*
|
||||
* Lorenzo Bianconi <lorenzo.bianconi@st.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/slab.h>
|
||||
#include "hts221.h"
|
||||
|
||||
#define I2C_AUTO_INCREMENT 0x80
|
||||
|
||||
static int hts221_i2c_read(struct device *dev, u8 addr, int len, u8 *data)
|
||||
{
|
||||
struct i2c_msg msg[2];
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
|
||||
if (len > 1)
|
||||
addr |= I2C_AUTO_INCREMENT;
|
||||
|
||||
msg[0].addr = client->addr;
|
||||
msg[0].flags = client->flags;
|
||||
msg[0].len = 1;
|
||||
msg[0].buf = &addr;
|
||||
|
||||
msg[1].addr = client->addr;
|
||||
msg[1].flags = client->flags | I2C_M_RD;
|
||||
msg[1].len = len;
|
||||
msg[1].buf = data;
|
||||
|
||||
return i2c_transfer(client->adapter, msg, 2);
|
||||
}
|
||||
|
||||
static int hts221_i2c_write(struct device *dev, u8 addr, int len, u8 *data)
|
||||
{
|
||||
u8 send[len + 1];
|
||||
struct i2c_msg msg;
|
||||
struct i2c_client *client = to_i2c_client(dev);
|
||||
|
||||
if (len > 1)
|
||||
addr |= I2C_AUTO_INCREMENT;
|
||||
|
||||
send[0] = addr;
|
||||
memcpy(&send[1], data, len * sizeof(u8));
|
||||
|
||||
msg.addr = client->addr;
|
||||
msg.flags = client->flags;
|
||||
msg.len = len + 1;
|
||||
msg.buf = send;
|
||||
|
||||
return i2c_transfer(client->adapter, &msg, 1);
|
||||
}
|
||||
|
||||
static const struct hts221_transfer_function hts221_transfer_fn = {
|
||||
.read = hts221_i2c_read,
|
||||
.write = hts221_i2c_write,
|
||||
};
|
||||
|
||||
static int hts221_i2c_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct hts221_hw *hw;
|
||||
struct iio_dev *iio_dev;
|
||||
|
||||
iio_dev = devm_iio_device_alloc(&client->dev, sizeof(*hw));
|
||||
if (!iio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
i2c_set_clientdata(client, iio_dev);
|
||||
|
||||
hw = iio_priv(iio_dev);
|
||||
hw->name = client->name;
|
||||
hw->dev = &client->dev;
|
||||
hw->irq = client->irq;
|
||||
hw->tf = &hts221_transfer_fn;
|
||||
|
||||
return hts221_probe(iio_dev);
|
||||
}
|
||||
|
||||
static const struct of_device_id hts221_i2c_of_match[] = {
|
||||
{ .compatible = "st,hts221", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, hts221_i2c_of_match);
|
||||
|
||||
static const struct i2c_device_id hts221_i2c_id_table[] = {
|
||||
{ HTS221_DEV_NAME },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);
|
||||
|
||||
static struct i2c_driver hts221_driver = {
|
||||
.driver = {
|
||||
.name = "hts221_i2c",
|
||||
.of_match_table = of_match_ptr(hts221_i2c_of_match),
|
||||
},
|
||||
.probe = hts221_i2c_probe,
|
||||
.id_table = hts221_i2c_id_table,
|
||||
};
|
||||
module_i2c_driver(hts221_driver);
|
||||
|
||||
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics hts221 i2c driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
125
drivers/iio/humidity/hts221_spi.c
Normal file
125
drivers/iio/humidity/hts221_spi.c
Normal file
@ -0,0 +1,125 @@
|
||||
/*
|
||||
* STMicroelectronics hts221 spi driver
|
||||
*
|
||||
* Copyright 2016 STMicroelectronics Inc.
|
||||
*
|
||||
* Lorenzo Bianconi <lorenzo.bianconi@st.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/slab.h>
|
||||
#include "hts221.h"
|
||||
|
||||
#define SENSORS_SPI_READ 0x80
|
||||
#define SPI_AUTO_INCREMENT 0x40
|
||||
|
||||
static int hts221_spi_read(struct device *dev, u8 addr, int len, u8 *data)
|
||||
{
|
||||
int err;
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
struct iio_dev *iio_dev = spi_get_drvdata(spi);
|
||||
struct hts221_hw *hw = iio_priv(iio_dev);
|
||||
|
||||
struct spi_transfer xfers[] = {
|
||||
{
|
||||
.tx_buf = hw->tb.tx_buf,
|
||||
.bits_per_word = 8,
|
||||
.len = 1,
|
||||
},
|
||||
{
|
||||
.rx_buf = hw->tb.rx_buf,
|
||||
.bits_per_word = 8,
|
||||
.len = len,
|
||||
}
|
||||
};
|
||||
|
||||
if (len > 1)
|
||||
addr |= SPI_AUTO_INCREMENT;
|
||||
hw->tb.tx_buf[0] = addr | SENSORS_SPI_READ;
|
||||
|
||||
err = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers));
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
memcpy(data, hw->tb.rx_buf, len * sizeof(u8));
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static int hts221_spi_write(struct device *dev, u8 addr, int len, u8 *data)
|
||||
{
|
||||
struct spi_device *spi = to_spi_device(dev);
|
||||
struct iio_dev *iio_dev = spi_get_drvdata(spi);
|
||||
struct hts221_hw *hw = iio_priv(iio_dev);
|
||||
|
||||
struct spi_transfer xfers = {
|
||||
.tx_buf = hw->tb.tx_buf,
|
||||
.bits_per_word = 8,
|
||||
.len = len + 1,
|
||||
};
|
||||
|
||||
if (len >= HTS221_TX_MAX_LENGTH)
|
||||
return -ENOMEM;
|
||||
|
||||
if (len > 1)
|
||||
addr |= SPI_AUTO_INCREMENT;
|
||||
hw->tb.tx_buf[0] = addr;
|
||||
memcpy(&hw->tb.tx_buf[1], data, len);
|
||||
|
||||
return spi_sync_transfer(spi, &xfers, 1);
|
||||
}
|
||||
|
||||
static const struct hts221_transfer_function hts221_transfer_fn = {
|
||||
.read = hts221_spi_read,
|
||||
.write = hts221_spi_write,
|
||||
};
|
||||
|
||||
static int hts221_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
struct hts221_hw *hw;
|
||||
struct iio_dev *iio_dev;
|
||||
|
||||
iio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*hw));
|
||||
if (!iio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
spi_set_drvdata(spi, iio_dev);
|
||||
|
||||
hw = iio_priv(iio_dev);
|
||||
hw->name = spi->modalias;
|
||||
hw->dev = &spi->dev;
|
||||
hw->irq = spi->irq;
|
||||
hw->tf = &hts221_transfer_fn;
|
||||
|
||||
return hts221_probe(iio_dev);
|
||||
}
|
||||
|
||||
static const struct of_device_id hts221_spi_of_match[] = {
|
||||
{ .compatible = "st,hts221", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, hts221_spi_of_match);
|
||||
|
||||
static const struct spi_device_id hts221_spi_id_table[] = {
|
||||
{ HTS221_DEV_NAME },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, hts221_spi_id_table);
|
||||
|
||||
static struct spi_driver hts221_driver = {
|
||||
.driver = {
|
||||
.name = "hts221_spi",
|
||||
.of_match_table = of_match_ptr(hts221_spi_of_match),
|
||||
},
|
||||
.probe = hts221_spi_probe,
|
||||
.id_table = hts221_spi_id_table,
|
||||
};
|
||||
module_spi_driver(hts221_driver);
|
||||
|
||||
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics hts221 spi driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue
Block a user