iio:pressure: Add STMicroelectronics pressures driver
This patch adds a generic pressure driver for STMicroelectronics pressure sensors, currently it supports: LPS331AP. Signed-off-by: Denis Ciocca <denis.ciocca@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Denis CIOCCA
Jonathan Cameron
parent
607a568ab6
commit
217494e5b7
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@ -73,5 +73,6 @@ source "drivers/iio/magnetometer/Kconfig"
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if IIO_TRIGGER
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source "drivers/iio/trigger/Kconfig"
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endif #IIO_TRIGGER
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source "drivers/iio/pressure/Kconfig"
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endif # IIO
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@ -22,3 +22,4 @@ obj-y += imu/
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obj-y += light/
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obj-y += magnetometer/
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obj-y += trigger/
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obj-y += pressure/
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@ -0,0 +1,35 @@
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#
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# Pressure drivers
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#
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menu "Pressure Sensors"
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config IIO_ST_PRESS
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tristate "STMicroelectronics pressures Driver"
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depends on (I2C || SPI_MASTER) && SYSFS
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select IIO_ST_SENSORS_CORE
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select IIO_ST_PRESS_I2C if (I2C)
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select IIO_ST_PRESS_SPI if (SPI_MASTER)
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select IIO_TRIGGERED_BUFFER if (IIO_BUFFER)
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help
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Say yes here to build support for STMicroelectronics pressures:
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LPS331AP.
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This driver can also be built as a module. If so, will be created
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these modules:
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- st_pressure (core functions for the driver [it is mandatory]);
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- st_pressure_i2c (necessary for the I2C devices [optional*]);
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- st_pressure_spi (necessary for the SPI devices [optional*]);
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(*) one of these is necessary to do something.
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config IIO_ST_PRESS_I2C
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tristate
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depends on IIO_ST_PRESS
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depends on IIO_ST_SENSORS_I2C
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config IIO_ST_PRESS_SPI
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tristate
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depends on IIO_ST_PRESS
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depends on IIO_ST_SENSORS_SPI
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endmenu
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@ -0,0 +1,10 @@
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#
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# Makefile for industrial I/O pressure drivers
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#
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obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o
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st_pressure-y := st_pressure_core.o
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st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o
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obj-$(CONFIG_IIO_ST_PRESS_I2C) += st_pressure_i2c.o
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obj-$(CONFIG_IIO_ST_PRESS_SPI) += st_pressure_spi.o
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@ -0,0 +1,39 @@
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/*
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* STMicroelectronics pressures driver
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*
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* Copyright 2013 STMicroelectronics Inc.
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*
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* Denis Ciocca <denis.ciocca@st.com>
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* v. 1.0.0
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* Licensed under the GPL-2.
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*/
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#ifndef ST_PRESS_H
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#define ST_PRESS_H
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#include <linux/types.h>
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#include <linux/iio/common/st_sensors.h>
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#define LPS331AP_PRESS_DEV_NAME "lps331ap"
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int st_press_common_probe(struct iio_dev *indio_dev);
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void st_press_common_remove(struct iio_dev *indio_dev);
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#ifdef CONFIG_IIO_BUFFER
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int st_press_allocate_ring(struct iio_dev *indio_dev);
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void st_press_deallocate_ring(struct iio_dev *indio_dev);
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int st_press_trig_set_state(struct iio_trigger *trig, bool state);
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#define ST_PRESS_TRIGGER_SET_STATE (&st_press_trig_set_state)
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#else /* CONFIG_IIO_BUFFER */
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static inline int st_press_allocate_ring(struct iio_dev *indio_dev)
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{
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return 0;
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}
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static inline void st_press_deallocate_ring(struct iio_dev *indio_dev)
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{
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}
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#define ST_PRESS_TRIGGER_SET_STATE NULL
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#endif /* CONFIG_IIO_BUFFER */
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#endif /* ST_PRESS_H */
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@ -0,0 +1,105 @@
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/*
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* STMicroelectronics pressures driver
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*
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* Copyright 2013 STMicroelectronics Inc.
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*
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* Denis Ciocca <denis.ciocca@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/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.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/common/st_sensors.h>
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#include "st_pressure.h"
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int st_press_trig_set_state(struct iio_trigger *trig, bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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return st_sensors_set_dataready_irq(indio_dev, state);
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}
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static int st_press_buffer_preenable(struct iio_dev *indio_dev)
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{
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int err;
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err = st_sensors_set_enable(indio_dev, true);
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if (err < 0)
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goto st_press_set_enable_error;
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err = iio_sw_buffer_preenable(indio_dev);
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st_press_set_enable_error:
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return err;
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}
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static int st_press_buffer_postenable(struct iio_dev *indio_dev)
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{
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int err;
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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pdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
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if (pdata->buffer_data == NULL) {
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err = -ENOMEM;
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goto allocate_memory_error;
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}
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err = iio_triggered_buffer_postenable(indio_dev);
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if (err < 0)
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goto st_press_buffer_postenable_error;
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return err;
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st_press_buffer_postenable_error:
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kfree(pdata->buffer_data);
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allocate_memory_error:
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return err;
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}
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static int st_press_buffer_predisable(struct iio_dev *indio_dev)
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{
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int err;
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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err = iio_triggered_buffer_predisable(indio_dev);
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if (err < 0)
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goto st_press_buffer_predisable_error;
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err = st_sensors_set_enable(indio_dev, false);
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st_press_buffer_predisable_error:
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kfree(pdata->buffer_data);
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return err;
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}
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static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
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.preenable = &st_press_buffer_preenable,
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.postenable = &st_press_buffer_postenable,
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.predisable = &st_press_buffer_predisable,
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};
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int st_press_allocate_ring(struct iio_dev *indio_dev)
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{
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return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
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&st_sensors_trigger_handler, &st_press_buffer_setup_ops);
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}
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void st_press_deallocate_ring(struct iio_dev *indio_dev)
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{
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iio_triggered_buffer_cleanup(indio_dev);
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}
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MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
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MODULE_LICENSE("GPL v2");
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@ -0,0 +1,272 @@
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/*
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* STMicroelectronics pressures driver
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*
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* Copyright 2013 STMicroelectronics Inc.
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*
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* Denis Ciocca <denis.ciocca@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/slab.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/buffer.h>
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#include <asm/unaligned.h>
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#include <linux/iio/common/st_sensors.h>
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#include "st_pressure.h"
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#define ST_PRESS_MBAR_TO_KPASCAL(x) (x * 10)
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#define ST_PRESS_NUMBER_DATA_CHANNELS 1
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/* DEFAULT VALUE FOR SENSORS */
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#define ST_PRESS_DEFAULT_OUT_XL_ADDR 0x28
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#define ST_TEMP_DEFAULT_OUT_L_ADDR 0x2b
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/* FULLSCALE */
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#define ST_PRESS_FS_AVL_1260MB 1260
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/* CUSTOM VALUES FOR SENSOR 1 */
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#define ST_PRESS_1_WAI_EXP 0xbb
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#define ST_PRESS_1_ODR_ADDR 0x20
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#define ST_PRESS_1_ODR_MASK 0x70
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#define ST_PRESS_1_ODR_AVL_1HZ_VAL 0x01
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#define ST_PRESS_1_ODR_AVL_7HZ_VAL 0x05
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#define ST_PRESS_1_ODR_AVL_13HZ_VAL 0x06
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#define ST_PRESS_1_ODR_AVL_25HZ_VAL 0x07
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#define ST_PRESS_1_PW_ADDR 0x20
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#define ST_PRESS_1_PW_MASK 0x80
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#define ST_PRESS_1_FS_ADDR 0x23
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#define ST_PRESS_1_FS_MASK 0x30
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#define ST_PRESS_1_FS_AVL_1260_VAL 0x00
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#define ST_PRESS_1_FS_AVL_1260_GAIN ST_PRESS_MBAR_TO_KPASCAL(244141)
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#define ST_PRESS_1_FS_AVL_TEMP_GAIN 2083000
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#define ST_PRESS_1_BDU_ADDR 0x20
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#define ST_PRESS_1_BDU_MASK 0x04
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#define ST_PRESS_1_DRDY_IRQ_ADDR 0x22
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#define ST_PRESS_1_DRDY_IRQ_MASK 0x04
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#define ST_PRESS_1_MULTIREAD_BIT true
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#define ST_PRESS_1_TEMP_OFFSET 42500
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static const struct iio_chan_spec st_press_channels[] = {
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ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24,
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ST_PRESS_DEFAULT_OUT_XL_ADDR),
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ST_SENSORS_LSM_CHANNELS(IIO_TEMP,
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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-1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16,
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ST_TEMP_DEFAULT_OUT_L_ADDR),
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IIO_CHAN_SOFT_TIMESTAMP(1)
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};
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static const struct st_sensors st_press_sensors[] = {
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{
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.wai = ST_PRESS_1_WAI_EXP,
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.sensors_supported = {
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[0] = LPS331AP_PRESS_DEV_NAME,
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},
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.ch = (struct iio_chan_spec *)st_press_channels,
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.odr = {
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.addr = ST_PRESS_1_ODR_ADDR,
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.mask = ST_PRESS_1_ODR_MASK,
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.odr_avl = {
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{ 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, },
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{ 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, },
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{ 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, },
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{ 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, },
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},
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},
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.pw = {
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.addr = ST_PRESS_1_PW_ADDR,
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.mask = ST_PRESS_1_PW_MASK,
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.value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
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.value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
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},
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.fs = {
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.addr = ST_PRESS_1_FS_ADDR,
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.mask = ST_PRESS_1_FS_MASK,
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.fs_avl = {
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[0] = {
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.num = ST_PRESS_FS_AVL_1260MB,
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.value = ST_PRESS_1_FS_AVL_1260_VAL,
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.gain = ST_PRESS_1_FS_AVL_1260_GAIN,
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.gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN,
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},
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},
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},
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.bdu = {
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.addr = ST_PRESS_1_BDU_ADDR,
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.mask = ST_PRESS_1_BDU_MASK,
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},
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.drdy_irq = {
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.addr = ST_PRESS_1_DRDY_IRQ_ADDR,
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.mask = ST_PRESS_1_DRDY_IRQ_MASK,
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},
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.multi_read_bit = ST_PRESS_1_MULTIREAD_BIT,
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.bootime = 2,
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},
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};
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static int st_press_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *ch, int *val,
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int *val2, long mask)
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{
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int err;
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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err = st_sensors_read_info_raw(indio_dev, ch, val);
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if (err < 0)
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goto read_error;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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switch (ch->type) {
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case IIO_PRESSURE:
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*val2 = pdata->current_fullscale->gain;
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break;
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case IIO_TEMP:
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*val2 = pdata->current_fullscale->gain2;
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break;
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default:
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err = -EINVAL;
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goto read_error;
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}
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return IIO_VAL_INT_PLUS_NANO;
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case IIO_CHAN_INFO_OFFSET:
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switch (ch->type) {
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case IIO_TEMP:
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*val = 425;
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*val2 = 10;
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break;
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default:
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err = -EINVAL;
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goto read_error;
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}
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return IIO_VAL_FRACTIONAL;
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default:
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return -EINVAL;
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}
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read_error:
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return err;
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}
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static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
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static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
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static struct attribute *st_press_attributes[] = {
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&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
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&iio_dev_attr_sampling_frequency.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group st_press_attribute_group = {
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.attrs = st_press_attributes,
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};
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static const struct iio_info press_info = {
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.driver_module = THIS_MODULE,
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.attrs = &st_press_attribute_group,
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.read_raw = &st_press_read_raw,
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};
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#ifdef CONFIG_IIO_TRIGGER
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static const struct iio_trigger_ops st_press_trigger_ops = {
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.owner = THIS_MODULE,
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.set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
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};
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#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
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#else
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#define ST_PRESS_TRIGGER_OPS NULL
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#endif
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int st_press_common_probe(struct iio_dev *indio_dev)
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{
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int err;
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struct st_sensor_data *pdata = iio_priv(indio_dev);
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &press_info;
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err = st_sensors_check_device_support(indio_dev,
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ARRAY_SIZE(st_press_sensors), st_press_sensors);
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if (err < 0)
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goto st_press_common_probe_error;
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pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
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pdata->multiread_bit = pdata->sensor->multi_read_bit;
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indio_dev->channels = pdata->sensor->ch;
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indio_dev->num_channels = ARRAY_SIZE(st_press_channels);
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pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
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&pdata->sensor->fs.fs_avl[0];
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pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
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err = st_sensors_init_sensor(indio_dev);
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if (err < 0)
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goto st_press_common_probe_error;
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if (pdata->get_irq_data_ready(indio_dev) > 0) {
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err = st_press_allocate_ring(indio_dev);
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if (err < 0)
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goto st_press_common_probe_error;
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err = st_sensors_allocate_trigger(indio_dev,
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ST_PRESS_TRIGGER_OPS);
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if (err < 0)
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goto st_press_probe_trigger_error;
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}
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err = iio_device_register(indio_dev);
|
||||
if (err)
|
||||
goto st_press_device_register_error;
|
||||
|
||||
return err;
|
||||
|
||||
st_press_device_register_error:
|
||||
if (pdata->get_irq_data_ready(indio_dev) > 0)
|
||||
st_sensors_deallocate_trigger(indio_dev);
|
||||
st_press_probe_trigger_error:
|
||||
if (pdata->get_irq_data_ready(indio_dev) > 0)
|
||||
st_press_deallocate_ring(indio_dev);
|
||||
st_press_common_probe_error:
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(st_press_common_probe);
|
||||
|
||||
void st_press_common_remove(struct iio_dev *indio_dev)
|
||||
{
|
||||
struct st_sensor_data *pdata = iio_priv(indio_dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
if (pdata->get_irq_data_ready(indio_dev) > 0) {
|
||||
st_sensors_deallocate_trigger(indio_dev);
|
||||
st_press_deallocate_ring(indio_dev);
|
||||
}
|
||||
iio_device_free(indio_dev);
|
||||
}
|
||||
EXPORT_SYMBOL(st_press_common_remove);
|
||||
|
||||
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics pressures driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,77 @@
|
|||
/*
|
||||
* STMicroelectronics pressures driver
|
||||
*
|
||||
* Copyright 2013 STMicroelectronics Inc.
|
||||
*
|
||||
* Denis Ciocca <denis.ciocca@st.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/iio/iio.h>
|
||||
|
||||
#include <linux/iio/common/st_sensors.h>
|
||||
#include <linux/iio/common/st_sensors_i2c.h>
|
||||
#include "st_pressure.h"
|
||||
|
||||
static int st_press_i2c_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct iio_dev *indio_dev;
|
||||
struct st_sensor_data *pdata;
|
||||
int err;
|
||||
|
||||
indio_dev = iio_device_alloc(sizeof(*pdata));
|
||||
if (indio_dev == NULL) {
|
||||
err = -ENOMEM;
|
||||
goto iio_device_alloc_error;
|
||||
}
|
||||
|
||||
pdata = iio_priv(indio_dev);
|
||||
pdata->dev = &client->dev;
|
||||
|
||||
st_sensors_i2c_configure(indio_dev, client, pdata);
|
||||
|
||||
err = st_press_common_probe(indio_dev);
|
||||
if (err < 0)
|
||||
goto st_press_common_probe_error;
|
||||
|
||||
return 0;
|
||||
|
||||
st_press_common_probe_error:
|
||||
iio_device_free(indio_dev);
|
||||
iio_device_alloc_error:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int st_press_i2c_remove(struct i2c_client *client)
|
||||
{
|
||||
st_press_common_remove(i2c_get_clientdata(client));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id st_press_id_table[] = {
|
||||
{ LPS331AP_PRESS_DEV_NAME },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, st_press_id_table);
|
||||
|
||||
static struct i2c_driver st_press_driver = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "st-press-i2c",
|
||||
},
|
||||
.probe = st_press_i2c_probe,
|
||||
.remove = st_press_i2c_remove,
|
||||
.id_table = st_press_id_table,
|
||||
};
|
||||
module_i2c_driver(st_press_driver);
|
||||
|
||||
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics pressures i2c driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,76 @@
|
|||
/*
|
||||
* STMicroelectronics pressures driver
|
||||
*
|
||||
* Copyright 2013 STMicroelectronics Inc.
|
||||
*
|
||||
* Denis Ciocca <denis.ciocca@st.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/iio/iio.h>
|
||||
|
||||
#include <linux/iio/common/st_sensors.h>
|
||||
#include <linux/iio/common/st_sensors_spi.h>
|
||||
#include "st_pressure.h"
|
||||
|
||||
static int st_press_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
struct iio_dev *indio_dev;
|
||||
struct st_sensor_data *pdata;
|
||||
int err;
|
||||
|
||||
indio_dev = iio_device_alloc(sizeof(*pdata));
|
||||
if (indio_dev == NULL) {
|
||||
err = -ENOMEM;
|
||||
goto iio_device_alloc_error;
|
||||
}
|
||||
|
||||
pdata = iio_priv(indio_dev);
|
||||
pdata->dev = &spi->dev;
|
||||
|
||||
st_sensors_spi_configure(indio_dev, spi, pdata);
|
||||
|
||||
err = st_press_common_probe(indio_dev);
|
||||
if (err < 0)
|
||||
goto st_press_common_probe_error;
|
||||
|
||||
return 0;
|
||||
|
||||
st_press_common_probe_error:
|
||||
iio_device_free(indio_dev);
|
||||
iio_device_alloc_error:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int st_press_spi_remove(struct spi_device *spi)
|
||||
{
|
||||
st_press_common_remove(spi_get_drvdata(spi));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id st_press_id_table[] = {
|
||||
{ LPS331AP_PRESS_DEV_NAME },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, st_press_id_table);
|
||||
|
||||
static struct spi_driver st_press_driver = {
|
||||
.driver = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "st-press-spi",
|
||||
},
|
||||
.probe = st_press_spi_probe,
|
||||
.remove = st_press_spi_remove,
|
||||
.id_table = st_press_id_table,
|
||||
};
|
||||
module_spi_driver(st_press_driver);
|
||||
|
||||
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
|
||||
MODULE_DESCRIPTION("STMicroelectronics pressures spi driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in New Issue