iio: pressure: Add driver for DLH pressure sensors (ac78c6aa) · Commits · EulixOS / Software / Kernel

MAINTAINERS

+7 −0

Original line number	Diff line number	Diff line
		@@ -668,6 +668,13 @@ S: Maintained
		F: Documentation/i2c/busses/i2c-ali1563.rst
		F: drivers/i2c/busses/i2c-ali1563.c

		ALL SENSORS DLH SERIES PRESSURE SENSORS DRIVER
		M: Tomislav Denis <tomislav.denis@avl.com>
		W: http://www.allsensors.com/
		S: Maintained
		L: linux-iio@vger.kernel.org
		F: drivers/iio/pressure/dlhl60d.c

		ALLEGRO DVT VIDEO IP CORE DRIVER
		M: Michael Tretter <m.tretter@pengutronix.de>
		R: Pengutronix Kernel Team <kernel@pengutronix.de>

drivers/iio/pressure/Kconfig

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		@@ -53,6 +53,18 @@ config IIO_CROS_EC_BARO
		To compile this driver as a module, choose M here: the module
		will be called cros_ec_baro.

		config DLHL60D
		tristate "All Sensors DLHL60D and DLHL60G low voltage digital pressure sensors"
		depends on I2C
		select IIO_BUFFER
		select IIO_TRIGGERED_BUFFER
		help
		Say yes here to build support for the All Sensors DLH series
		pressure sensors driver.

		To compile this driver as a module, choose M here: the module
		will be called dlhl60d.

		config DPS310
		tristate "Infineon DPS310 pressure and temperature sensor"
		depends on I2C

drivers/iio/pressure/Makefile

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		@@ -9,6 +9,7 @@ obj-$(CONFIG_BMP280) += bmp280.o
		bmp280-objs := bmp280-core.o bmp280-regmap.o
		obj-$(CONFIG_BMP280_I2C) += bmp280-i2c.o
		obj-$(CONFIG_BMP280_SPI) += bmp280-spi.o
		obj-$(CONFIG_DLHL60D) += dlhl60d.o
		obj-$(CONFIG_DPS310) += dps310.o
		obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o
		obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o

drivers/iio/pressure/dlhl60d.c

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+375 −0

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* All Sensors DLH series low voltage digital pressure sensors
		*
		* Copyright (c) 2019 AVL DiTEST GmbH
		* Tomislav Denis <tomislav.denis@avl.com>
		*
		* Datasheet: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF
		*/

		#include <linux/module.h>
		#include <linux/delay.h>
		#include <linux/i2c.h>
		#include <linux/iio/iio.h>
		#include <linux/iio/buffer.h>
		#include <linux/iio/trigger_consumer.h>
		#include <linux/iio/triggered_buffer.h>
		#include <asm/unaligned.h>

		/* Commands */
		#define DLH_START_SINGLE 0xAA

		/* Status bits */
		#define DLH_STATUS_OK 0x40

		/* DLH data format */
		#define DLH_NUM_READ_BYTES 7
		#define DLH_NUM_DATA_BYTES 3
		#define DLH_NUM_PR_BITS 24
		#define DLH_NUM_TEMP_BITS 24

		/* DLH timings */
		#define DLH_SINGLE_DUT_MS 5

		enum dhl_ids {
		dlhl60d,
		dlhl60g,
		};

		struct dlh_info {
		u8 osdig; /* digital offset factor */
		unsigned int fss; /* full scale span (inch H2O) */
		};

		struct dlh_state {
		struct i2c_client *client;
		struct dlh_info info;
		bool use_interrupt;
		struct completion completion;
		u8 rx_buf[DLH_NUM_READ_BYTES] ____cacheline_aligned;
		};

		static struct dlh_info dlh_info_tbl[] = {
		[dlhl60d] = {
		.osdig = 2,
		.fss = 120,
		},
		[dlhl60g] = {
		.osdig = 10,
		.fss = 60,
		},
		};


		static int dlh_cmd_start_single(struct dlh_state *st)
		{
		int ret;

		ret = i2c_smbus_write_byte(st->client, DLH_START_SINGLE);
		if (ret)
		dev_err(&st->client->dev,
		"%s: I2C write byte failed\n", __func__);

		return ret;
		}

		static int dlh_cmd_read_data(struct dlh_state *st)
		{
		int ret;

		ret = i2c_master_recv(st->client, st->rx_buf, DLH_NUM_READ_BYTES);
		if (ret < 0) {
		dev_err(&st->client->dev,
		"%s: I2C read block failed\n", __func__);
		return ret;
		}

		if (st->rx_buf[0] != DLH_STATUS_OK) {
		dev_err(&st->client->dev,
		"%s: invalid status 0x%02x\n", __func__, st->rx_buf[0]);
		return -EBUSY;
		}

		return 0;
		}

		static int dlh_start_capture_and_read(struct dlh_state *st)
		{
		int ret;

		if (st->use_interrupt)
		reinit_completion(&st->completion);

		ret = dlh_cmd_start_single(st);
		if (ret)
		return ret;

		if (st->use_interrupt) {
		ret = wait_for_completion_timeout(&st->completion,
		msecs_to_jiffies(DLH_SINGLE_DUT_MS));
		if (!ret) {
		dev_err(&st->client->dev,
		"%s: conversion timed out\n", __func__);
		return -ETIMEDOUT;
		}
		} else {
		mdelay(DLH_SINGLE_DUT_MS);
		}

		return dlh_cmd_read_data(st);
		}

		static int dlh_read_direct(struct dlh_state *st,
		unsigned int pressure, unsigned int temperature)
		{
		int ret;

		ret = dlh_start_capture_and_read(st);
		if (ret)
		return ret;

		*pressure = get_unaligned_be32(&st->rx_buf[1]) >> 8;
		*temperature = get_unaligned_be32(&st->rx_buf[3]) &
		GENMASK(DLH_NUM_TEMP_BITS - 1, 0);

		return 0;
		}

		static int dlh_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const channel, int value,
		int *value2, long mask)
		{
		struct dlh_state *st = iio_priv(indio_dev);
		unsigned int pressure, temperature;
		int ret;
		s64 tmp;
		s32 rem;

		switch (mask) {
		case IIO_CHAN_INFO_RAW:
		ret = iio_device_claim_direct_mode(indio_dev);
		if (ret)
		return ret;

		ret = dlh_read_direct(st, &pressure, &temperature);
		iio_device_release_direct_mode(indio_dev);
		if (ret)
		return ret;

		switch (channel->type) {
		case IIO_PRESSURE:
		*value = pressure;
		return IIO_VAL_INT;

		case IIO_TEMP:
		*value = temperature;
		return IIO_VAL_INT;

		default:
		return -EINVAL;
		}
		case IIO_CHAN_INFO_SCALE:
		switch (channel->type) {
		case IIO_PRESSURE:
		tmp = div_s64(125LL * st->info.fss * 24909 * 100,
		1 << DLH_NUM_PR_BITS);
		tmp = div_s64_rem(tmp, 1000000000LL, &rem);
		*value = tmp;
		*value2 = rem;
		return IIO_VAL_INT_PLUS_NANO;

		case IIO_TEMP:
		value = 125 1000;
		*value2 = DLH_NUM_TEMP_BITS;
		return IIO_VAL_FRACTIONAL_LOG2;

		default:
		return -EINVAL;
		}
		case IIO_CHAN_INFO_OFFSET:
		switch (channel->type) {
		case IIO_PRESSURE:
		value = -125 st->info.fss * 24909;
		value2 = 100 st->info.osdig * 100000;
		return IIO_VAL_FRACTIONAL;

		case IIO_TEMP:
		value = -40 1000;
		return IIO_VAL_INT;

		default:
		return -EINVAL;
		}
		}

		return -EINVAL;
		}

		static const struct iio_info dlh_info = {
		.read_raw = dlh_read_raw,
		};

		static const struct iio_chan_spec dlh_channels[] = {
		{
		.type = IIO_PRESSURE,
		.indexed = 1,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type =
		BIT(IIO_CHAN_INFO_SCALE) \|
		BIT(IIO_CHAN_INFO_OFFSET),
		.scan_index = 0,
		.scan_type = {
		.sign = 'u',
		.realbits = DLH_NUM_PR_BITS,
		.storagebits = 32,
		.shift = 8,
		.endianness = IIO_BE,
		},
		}, {
		.type = IIO_TEMP,
		.indexed = 1,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type =
		BIT(IIO_CHAN_INFO_SCALE) \|
		BIT(IIO_CHAN_INFO_OFFSET),
		.scan_index = 1,
		.scan_type = {
		.sign = 'u',
		.realbits = DLH_NUM_TEMP_BITS,
		.storagebits = 32,
		.shift = 8,
		.endianness = IIO_BE,
		},
		}
		};

		static irqreturn_t dlh_trigger_handler(int irq, void *private)
		{
		struct iio_poll_func *pf = private;
		struct iio_dev *indio_dev = pf->indio_dev;
		struct dlh_state *st = iio_priv(indio_dev);
		int ret;
		unsigned int chn, i = 0;
		__be32 tmp_buf[2];

		ret = dlh_start_capture_and_read(st);
		if (ret)
		goto out;

		for_each_set_bit(chn, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		memcpy(tmp_buf + i,
		&st->rx_buf[1] + chn * DLH_NUM_DATA_BYTES,
		DLH_NUM_DATA_BYTES);
		i++;
		}

		iio_push_to_buffers(indio_dev, tmp_buf);

		out:
		iio_trigger_notify_done(indio_dev->trig);

		return IRQ_HANDLED;
		}

		static irqreturn_t dlh_interrupt(int irq, void *private)
		{
		struct iio_dev *indio_dev = private;
		struct dlh_state *st = iio_priv(indio_dev);

		complete(&st->completion);

		return IRQ_HANDLED;
		};

		static int dlh_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct dlh_state *st;
		struct iio_dev *indio_dev;
		int ret;

		if (!i2c_check_functionality(client->adapter,
		I2C_FUNC_I2C \| I2C_FUNC_SMBUS_WRITE_BYTE)) {
		dev_err(&client->dev,
		"adapter doesn't support required i2c functionality\n");
		return -EOPNOTSUPP;
		}

		indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
		if (!indio_dev) {
		dev_err(&client->dev, "failed to allocate iio device\n");
		return -ENOMEM;
		}

		i2c_set_clientdata(client, indio_dev);

		st = iio_priv(indio_dev);
		st->info = dlh_info_tbl[id->driver_data];
		st->client = client;
		st->use_interrupt = false;

		indio_dev->name = id->name;
		indio_dev->dev.parent = &client->dev;
		indio_dev->dev.of_node = client->dev.of_node;
		indio_dev->info = &dlh_info;
		indio_dev->modes = INDIO_DIRECT_MODE;
		indio_dev->channels = dlh_channels;
		indio_dev->num_channels = ARRAY_SIZE(dlh_channels);

		if (client->irq > 0) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
		dlh_interrupt, NULL,
		IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
		id->name, indio_dev);
		if (ret) {
		dev_err(&client->dev, "failed to allocate threaded irq");
		return ret;
		}

		st->use_interrupt = true;
		init_completion(&st->completion);
		}

		ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
		NULL, &dlh_trigger_handler, NULL);
		if (ret) {
		dev_err(&client->dev, "failed to setup iio buffer\n");
		return ret;
		}

		ret = devm_iio_device_register(&client->dev, indio_dev);
		if (ret)
		dev_err(&client->dev, "failed to register iio device\n");

		return ret;
		}

		static const struct of_device_id dlh_of_match[] = {
		{ .compatible = "asc,dlhl60d" },
		{ .compatible = "asc,dlhl60g" },
		{}
		};
		MODULE_DEVICE_TABLE(of, dlh_of_match);

		static const struct i2c_device_id dlh_id[] = {
		{ "dlhl60d", dlhl60d },
		{ "dlhl60g", dlhl60g },
		{}
		};
		MODULE_DEVICE_TABLE(i2c, dlh_id);

		static struct i2c_driver dlh_driver = {
		.driver = {
		.name = "dlhl60d",
		.of_match_table = dlh_of_match,
		},
		.probe = dlh_probe,
		.id_table = dlh_id,
		};
		module_i2c_driver(dlh_driver);

		MODULE_AUTHOR("Tomislav Denis <tomislav.denis@avl.com>");
		MODULE_DESCRIPTION("Driver for All Sensors DLH series pressure sensors");
		MODULE_LICENSE("GPL v2");