iio: pressure: Add driver for DLH pressure sensors
All Sensors DLH is series of low voltage digital pressure sensors. Additionally to pressure value sensors deliver a temperature value. Sensors can be accessed over I2C and SPI, this driver supports only I2C access. Signed-off-by: Tomislav Denis <tomislav.denis@avl.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Tomislav Denis
Jonathan Cameron
Родитель
0c040d1ddc
Коммит
ac78c6aa4a
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@ -668,6 +668,13 @@ S: Maintained
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F: Documentation/i2c/busses/i2c-ali1563.rst
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F: drivers/i2c/busses/i2c-ali1563.c
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ALL SENSORS DLH SERIES PRESSURE SENSORS DRIVER
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M: Tomislav Denis <tomislav.denis@avl.com>
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W: http://www.allsensors.com/
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S: Maintained
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L: linux-iio@vger.kernel.org
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F: drivers/iio/pressure/dlhl60d.c
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ALLEGRO DVT VIDEO IP CORE DRIVER
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M: Michael Tretter <m.tretter@pengutronix.de>
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R: Pengutronix Kernel Team <kernel@pengutronix.de>
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@ -53,6 +53,18 @@ 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 DLHL60D
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tristate "All Sensors DLHL60D and DLHL60G low voltage digital pressure sensors"
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depends on I2C
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select IIO_BUFFER
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select IIO_TRIGGERED_BUFFER
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help
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Say yes here to build support for the All Sensors DLH series
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pressure sensors driver.
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To compile this driver as a module, choose M here: the module
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will be called dlhl60d.
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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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@ -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_DLHL60D) += dlhl60d.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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@ -0,0 +1,375 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* All Sensors DLH series low voltage digital pressure sensors
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*
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* Copyright (c) 2019 AVL DiTEST GmbH
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* Tomislav Denis <tomislav.denis@avl.com>
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*
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* Datasheet: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/i2c.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 <asm/unaligned.h>
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/* Commands */
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#define DLH_START_SINGLE 0xAA
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/* Status bits */
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#define DLH_STATUS_OK 0x40
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/* DLH data format */
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#define DLH_NUM_READ_BYTES 7
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#define DLH_NUM_DATA_BYTES 3
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#define DLH_NUM_PR_BITS 24
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#define DLH_NUM_TEMP_BITS 24
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/* DLH timings */
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#define DLH_SINGLE_DUT_MS 5
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enum dhl_ids {
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dlhl60d,
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dlhl60g,
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};
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struct dlh_info {
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u8 osdig; /* digital offset factor */
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unsigned int fss; /* full scale span (inch H2O) */
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};
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struct dlh_state {
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struct i2c_client *client;
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struct dlh_info info;
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bool use_interrupt;
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struct completion completion;
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u8 rx_buf[DLH_NUM_READ_BYTES] ____cacheline_aligned;
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};
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static struct dlh_info dlh_info_tbl[] = {
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[dlhl60d] = {
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.osdig = 2,
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.fss = 120,
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},
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[dlhl60g] = {
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.osdig = 10,
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.fss = 60,
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},
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};
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static int dlh_cmd_start_single(struct dlh_state *st)
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{
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int ret;
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ret = i2c_smbus_write_byte(st->client, DLH_START_SINGLE);
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if (ret)
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dev_err(&st->client->dev,
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"%s: I2C write byte failed\n", __func__);
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return ret;
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}
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static int dlh_cmd_read_data(struct dlh_state *st)
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{
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int ret;
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ret = i2c_master_recv(st->client, st->rx_buf, DLH_NUM_READ_BYTES);
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if (ret < 0) {
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dev_err(&st->client->dev,
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"%s: I2C read block failed\n", __func__);
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return ret;
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}
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if (st->rx_buf[0] != DLH_STATUS_OK) {
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dev_err(&st->client->dev,
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"%s: invalid status 0x%02x\n", __func__, st->rx_buf[0]);
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return -EBUSY;
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}
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return 0;
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}
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static int dlh_start_capture_and_read(struct dlh_state *st)
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{
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int ret;
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if (st->use_interrupt)
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reinit_completion(&st->completion);
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ret = dlh_cmd_start_single(st);
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if (ret)
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return ret;
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if (st->use_interrupt) {
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ret = wait_for_completion_timeout(&st->completion,
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msecs_to_jiffies(DLH_SINGLE_DUT_MS));
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if (!ret) {
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dev_err(&st->client->dev,
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"%s: conversion timed out\n", __func__);
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return -ETIMEDOUT;
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}
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} else {
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mdelay(DLH_SINGLE_DUT_MS);
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}
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return dlh_cmd_read_data(st);
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}
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static int dlh_read_direct(struct dlh_state *st,
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unsigned int *pressure, unsigned int *temperature)
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{
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int ret;
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ret = dlh_start_capture_and_read(st);
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if (ret)
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return ret;
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*pressure = get_unaligned_be32(&st->rx_buf[1]) >> 8;
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*temperature = get_unaligned_be32(&st->rx_buf[3]) &
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GENMASK(DLH_NUM_TEMP_BITS - 1, 0);
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return 0;
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}
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static int dlh_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *channel, int *value,
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int *value2, long mask)
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{
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struct dlh_state *st = iio_priv(indio_dev);
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unsigned int pressure, temperature;
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int ret;
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s64 tmp;
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s32 rem;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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ret = dlh_read_direct(st, &pressure, &temperature);
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iio_device_release_direct_mode(indio_dev);
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if (ret)
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return ret;
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switch (channel->type) {
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case IIO_PRESSURE:
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*value = pressure;
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return IIO_VAL_INT;
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case IIO_TEMP:
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*value = temperature;
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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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case IIO_CHAN_INFO_SCALE:
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switch (channel->type) {
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case IIO_PRESSURE:
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tmp = div_s64(125LL * st->info.fss * 24909 * 100,
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1 << DLH_NUM_PR_BITS);
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tmp = div_s64_rem(tmp, 1000000000LL, &rem);
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*value = tmp;
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*value2 = rem;
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return IIO_VAL_INT_PLUS_NANO;
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case IIO_TEMP:
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*value = 125 * 1000;
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*value2 = DLH_NUM_TEMP_BITS;
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return IIO_VAL_FRACTIONAL_LOG2;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_OFFSET:
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switch (channel->type) {
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case IIO_PRESSURE:
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*value = -125 * st->info.fss * 24909;
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*value2 = 100 * st->info.osdig * 100000;
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return IIO_VAL_FRACTIONAL;
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case IIO_TEMP:
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*value = -40 * 1000;
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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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return -EINVAL;
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}
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static const struct iio_info dlh_info = {
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.read_raw = dlh_read_raw,
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};
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static const struct iio_chan_spec dlh_channels[] = {
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{
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.type = IIO_PRESSURE,
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.indexed = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type =
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.scan_index = 0,
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.scan_type = {
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.sign = 'u',
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.realbits = DLH_NUM_PR_BITS,
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.storagebits = 32,
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.shift = 8,
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.endianness = IIO_BE,
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},
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}, {
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.type = IIO_TEMP,
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.indexed = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type =
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.scan_index = 1,
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.scan_type = {
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.sign = 'u',
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.realbits = DLH_NUM_TEMP_BITS,
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.storagebits = 32,
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.shift = 8,
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.endianness = IIO_BE,
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},
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}
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};
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static irqreturn_t dlh_trigger_handler(int irq, void *private)
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{
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struct iio_poll_func *pf = private;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct dlh_state *st = iio_priv(indio_dev);
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int ret;
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unsigned int chn, i = 0;
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__be32 tmp_buf[2];
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ret = dlh_start_capture_and_read(st);
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if (ret)
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goto out;
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for_each_set_bit(chn, indio_dev->active_scan_mask,
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indio_dev->masklength) {
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memcpy(tmp_buf + i,
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&st->rx_buf[1] + chn * DLH_NUM_DATA_BYTES,
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DLH_NUM_DATA_BYTES);
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i++;
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}
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iio_push_to_buffers(indio_dev, tmp_buf);
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out:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static irqreturn_t dlh_interrupt(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct dlh_state *st = iio_priv(indio_dev);
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complete(&st->completion);
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return IRQ_HANDLED;
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};
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static int dlh_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct dlh_state *st;
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struct iio_dev *indio_dev;
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int ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE)) {
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dev_err(&client->dev,
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"adapter doesn't support required i2c functionality\n");
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return -EOPNOTSUPP;
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}
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
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if (!indio_dev) {
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dev_err(&client->dev, "failed to allocate iio device\n");
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return -ENOMEM;
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}
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i2c_set_clientdata(client, indio_dev);
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st = iio_priv(indio_dev);
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st->info = dlh_info_tbl[id->driver_data];
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st->client = client;
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st->use_interrupt = false;
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indio_dev->name = id->name;
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indio_dev->dev.parent = &client->dev;
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indio_dev->dev.of_node = client->dev.of_node;
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indio_dev->info = &dlh_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = dlh_channels;
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indio_dev->num_channels = ARRAY_SIZE(dlh_channels);
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if (client->irq > 0) {
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ret = devm_request_threaded_irq(&client->dev, client->irq,
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dlh_interrupt, NULL,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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id->name, indio_dev);
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if (ret) {
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dev_err(&client->dev, "failed to allocate threaded irq");
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return ret;
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}
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st->use_interrupt = true;
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init_completion(&st->completion);
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}
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ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
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NULL, &dlh_trigger_handler, NULL);
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if (ret) {
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dev_err(&client->dev, "failed to setup iio buffer\n");
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return ret;
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}
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ret = devm_iio_device_register(&client->dev, indio_dev);
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if (ret)
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dev_err(&client->dev, "failed to register iio device\n");
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return ret;
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}
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static const struct of_device_id dlh_of_match[] = {
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{ .compatible = "asc,dlhl60d" },
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{ .compatible = "asc,dlhl60g" },
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{}
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};
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MODULE_DEVICE_TABLE(of, dlh_of_match);
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static const struct i2c_device_id dlh_id[] = {
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{ "dlhl60d", dlhl60d },
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{ "dlhl60g", dlhl60g },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, dlh_id);
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static struct i2c_driver dlh_driver = {
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.driver = {
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.name = "dlhl60d",
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.of_match_table = dlh_of_match,
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},
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.probe = dlh_probe,
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.id_table = dlh_id,
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};
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module_i2c_driver(dlh_driver);
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MODULE_AUTHOR("Tomislav Denis <tomislav.denis@avl.com>");
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MODULE_DESCRIPTION("Driver for All Sensors DLH series pressure sensors");
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MODULE_LICENSE("GPL v2");
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