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@@ -0,0 +1,461 @@
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+From 232e0f6ddeaee104d64675fe7d0cc142cf955f35 Mon Sep 17 00:00:00 2001
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+From: Tomasz Duszynski <[email protected]>
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+Date: Fri, 14 Dec 2018 19:28:02 +0100
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+Subject: [PATCH] iio: chemical: add support for Sensirion SPS30 sensor
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+
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+Add support for Sensirion SPS30 particulate matter sensor.
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+
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+Signed-off-by: Tomasz Duszynski <[email protected]>
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+Signed-off-by: Jonathan Cameron <[email protected]>
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+---
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+ drivers/iio/chemical/Kconfig | 11 +
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+ drivers/iio/chemical/Makefile | 1 +
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+ drivers/iio/chemical/sps30.c | 407 ++++++++++++++++++++++++++++++++++
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+ 3 files changed, 419 insertions(+)
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+ create mode 100644 drivers/iio/chemical/sps30.c
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+
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+diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig
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+index b8e005be4f87..57832b4360e9 100644
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+--- a/drivers/iio/chemical/Kconfig
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++++ b/drivers/iio/chemical/Kconfig
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+@@ -61,6 +61,17 @@ config IAQCORE
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+ iAQ-Core Continuous/Pulsed VOC (Volatile Organic Compounds)
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+ sensors
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+
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++config SPS30
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++ tristate "SPS30 particulate matter sensor"
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++ depends on I2C
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++ select CRC8
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++ help
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++ Say Y here to build support for the Sensirion SPS30 particulate
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++ matter sensor.
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++
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++ To compile this driver as a module, choose M here: the module will
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++ be called sps30.
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++
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+ config VZ89X
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+ tristate "SGX Sensortech MiCS VZ89X VOC sensor"
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+ depends on I2C
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+diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile
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+index 2f4c4ba4d781..9f42f4252151 100644
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+--- a/drivers/iio/chemical/Makefile
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++++ b/drivers/iio/chemical/Makefile
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+@@ -9,4 +9,5 @@ obj-$(CONFIG_BME680_I2C) += bme680_i2c.o
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+ obj-$(CONFIG_BME680_SPI) += bme680_spi.o
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+ obj-$(CONFIG_CCS811) += ccs811.o
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+ obj-$(CONFIG_IAQCORE) += ams-iaq-core.o
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++obj-$(CONFIG_SPS30) += sps30.o
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+ obj-$(CONFIG_VZ89X) += vz89x.o
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+diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c
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+new file mode 100644
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+index 000000000000..fa3cd409b90b
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+--- /dev/null
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++++ b/drivers/iio/chemical/sps30.c
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+@@ -0,0 +1,407 @@
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++// SPDX-License-Identifier: GPL-2.0
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++/*
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++ * Sensirion SPS30 particulate matter sensor driver
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++ *
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++ * Copyright (c) Tomasz Duszynski <[email protected]>
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++ *
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++ * I2C slave address: 0x69
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++ *
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++ * TODO:
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++ * - support for turning on fan cleaning
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++ * - support for reading/setting auto cleaning interval
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++ */
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++
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++#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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++
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++#include <asm/unaligned.h>
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++#include <linux/crc8.h>
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++#include <linux/delay.h>
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++#include <linux/i2c.h>
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++#include <linux/iio/buffer.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_consumer.h>
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++#include <linux/iio/triggered_buffer.h>
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++#include <linux/module.h>
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++
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++#define SPS30_CRC8_POLYNOMIAL 0x31
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++/* max number of bytes needed to store PM measurements or serial string */
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++#define SPS30_MAX_READ_SIZE 48
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++/* sensor measures reliably up to 3000 ug / m3 */
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++#define SPS30_MAX_PM 3000
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++
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++/* SPS30 commands */
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++#define SPS30_START_MEAS 0x0010
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++#define SPS30_STOP_MEAS 0x0104
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++#define SPS30_RESET 0xd304
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++#define SPS30_READ_DATA_READY_FLAG 0x0202
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++#define SPS30_READ_DATA 0x0300
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++#define SPS30_READ_SERIAL 0xd033
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++
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++enum {
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++ PM1,
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++ PM2P5,
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++ PM4,
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++ PM10,
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++};
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++
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++struct sps30_state {
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++ struct i2c_client *client;
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++ /*
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++ * Guards against concurrent access to sensor registers.
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++ * Must be held whenever sequence of commands is to be executed.
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++ */
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++ struct mutex lock;
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++};
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++
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++DECLARE_CRC8_TABLE(sps30_crc8_table);
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++
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++static int sps30_write_then_read(struct sps30_state *state, u8 *txbuf,
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++ int txsize, u8 *rxbuf, int rxsize)
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++{
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++ int ret;
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++
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++ /*
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++ * Sensor does not support repeated start so instead of
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++ * sending two i2c messages in a row we just send one by one.
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++ */
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++ ret = i2c_master_send(state->client, txbuf, txsize);
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++ if (ret != txsize)
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++ return ret < 0 ? ret : -EIO;
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++
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++ if (!rxbuf)
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++ return 0;
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++
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++ ret = i2c_master_recv(state->client, rxbuf, rxsize);
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++ if (ret != rxsize)
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++ return ret < 0 ? ret : -EIO;
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++
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++ return 0;
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++}
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++
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++static int sps30_do_cmd(struct sps30_state *state, u16 cmd, u8 *data, int size)
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++{
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++ /*
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++ * Internally sensor stores measurements in a following manner:
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++ *
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++ * PM1: upper two bytes, crc8, lower two bytes, crc8
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++ * PM2P5: upper two bytes, crc8, lower two bytes, crc8
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++ * PM4: upper two bytes, crc8, lower two bytes, crc8
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++ * PM10: upper two bytes, crc8, lower two bytes, crc8
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++ *
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++ * What follows next are number concentration measurements and
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++ * typical particle size measurement which we omit.
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++ */
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++ u8 buf[SPS30_MAX_READ_SIZE] = { cmd >> 8, cmd };
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++ int i, ret = 0;
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++
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++ switch (cmd) {
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++ case SPS30_START_MEAS:
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++ buf[2] = 0x03;
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++ buf[3] = 0x00;
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++ buf[4] = crc8(sps30_crc8_table, &buf[2], 2, CRC8_INIT_VALUE);
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++ ret = sps30_write_then_read(state, buf, 5, NULL, 0);
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++ break;
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++ case SPS30_STOP_MEAS:
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++ case SPS30_RESET:
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++ ret = sps30_write_then_read(state, buf, 2, NULL, 0);
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++ break;
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++ case SPS30_READ_DATA_READY_FLAG:
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++ case SPS30_READ_DATA:
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++ case SPS30_READ_SERIAL:
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++ /* every two data bytes are checksummed */
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++ size += size / 2;
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++ ret = sps30_write_then_read(state, buf, 2, buf, size);
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++ break;
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++ }
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++
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++ if (ret)
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++ return ret;
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++
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++ /* validate received data and strip off crc bytes */
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++ for (i = 0; i < size; i += 3) {
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++ u8 crc = crc8(sps30_crc8_table, &buf[i], 2, CRC8_INIT_VALUE);
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++
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++ if (crc != buf[i + 2]) {
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++ dev_err(&state->client->dev,
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++ "data integrity check failed\n");
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++ return -EIO;
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++ }
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++
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++ *data++ = buf[i];
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++ *data++ = buf[i + 1];
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++ }
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++
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++ return 0;
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++}
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++
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++static s32 sps30_float_to_int_clamped(const u8 *fp)
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++{
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++ int val = get_unaligned_be32(fp);
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++ int mantissa = val & GENMASK(22, 0);
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++ /* this is fine since passed float is always non-negative */
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++ int exp = val >> 23;
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++ int fraction, shift;
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++
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++ /* special case 0 */
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++ if (!exp && !mantissa)
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++ return 0;
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++
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++ exp -= 127;
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++ if (exp < 0) {
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++ /* return values ranging from 1 to 99 */
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++ return ((((1 << 23) + mantissa) * 100) >> 23) >> (-exp);
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++ }
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++
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++ /* return values ranging from 100 to 300000 */
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++ shift = 23 - exp;
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++ val = (1 << exp) + (mantissa >> shift);
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++ if (val >= SPS30_MAX_PM)
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++ return SPS30_MAX_PM * 100;
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++
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++ fraction = mantissa & GENMASK(shift - 1, 0);
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++
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++ return val * 100 + ((fraction * 100) >> shift);
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++}
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++
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++static int sps30_do_meas(struct sps30_state *state, s32 *data, int size)
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++{
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++ int i, ret, tries = 5;
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++ u8 tmp[16];
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++
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++ while (tries--) {
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++ ret = sps30_do_cmd(state, SPS30_READ_DATA_READY_FLAG, tmp, 2);
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++ if (ret)
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++ return -EIO;
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++
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++ /* new measurements ready to be read */
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++ if (tmp[1] == 1)
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++ break;
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++
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++ msleep_interruptible(300);
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++ }
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++
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++ if (!tries)
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++ return -ETIMEDOUT;
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++
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++ ret = sps30_do_cmd(state, SPS30_READ_DATA, tmp, sizeof(int) * size);
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++ if (ret)
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++ return ret;
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++
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++ for (i = 0; i < size; i++)
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++ data[i] = sps30_float_to_int_clamped(&tmp[4 * i]);
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++
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++ return 0;
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++}
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++
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++static irqreturn_t sps30_trigger_handler(int irq, void *p)
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++{
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++ struct iio_poll_func *pf = p;
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++ struct iio_dev *indio_dev = pf->indio_dev;
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++ struct sps30_state *state = iio_priv(indio_dev);
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++ int ret;
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++ s32 data[4 + 2]; /* PM1, PM2P5, PM4, PM10, timestamp */
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++
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++ mutex_lock(&state->lock);
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++ ret = sps30_do_meas(state, data, 4);
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++ mutex_unlock(&state->lock);
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++ if (ret)
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++ goto err;
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++
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++ iio_push_to_buffers_with_timestamp(indio_dev, data,
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++ iio_get_time_ns(indio_dev));
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++err:
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++ iio_trigger_notify_done(indio_dev->trig);
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++
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++ return IRQ_HANDLED;
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++}
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++
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++static int sps30_read_raw(struct iio_dev *indio_dev,
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++ struct iio_chan_spec const *chan,
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++ int *val, int *val2, long mask)
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++{
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++ struct sps30_state *state = iio_priv(indio_dev);
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++ int data[4], ret = -EINVAL;
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++
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++ switch (mask) {
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++ case IIO_CHAN_INFO_PROCESSED:
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++ switch (chan->type) {
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++ case IIO_MASSCONCENTRATION:
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++ mutex_lock(&state->lock);
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++ /* read up to the number of bytes actually needed */
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++ switch (chan->channel2) {
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++ case IIO_MOD_PM1:
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++ ret = sps30_do_meas(state, data, 1);
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++ break;
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++ case IIO_MOD_PM2P5:
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++ ret = sps30_do_meas(state, data, 2);
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++ break;
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++ case IIO_MOD_PM4:
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++ ret = sps30_do_meas(state, data, 3);
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++ break;
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++ case IIO_MOD_PM10:
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++ ret = sps30_do_meas(state, data, 4);
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++ break;
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++ }
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++ mutex_unlock(&state->lock);
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++ if (ret)
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++ return ret;
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++
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++ *val = data[chan->address] / 100;
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++ *val2 = (data[chan->address] % 100) * 10000;
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++
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++ return IIO_VAL_INT_PLUS_MICRO;
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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 (chan->type) {
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++ case IIO_MASSCONCENTRATION:
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++ switch (chan->channel2) {
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++ case IIO_MOD_PM1:
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++ case IIO_MOD_PM2P5:
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++ case IIO_MOD_PM4:
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++ case IIO_MOD_PM10:
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++ *val = 0;
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++ *val2 = 10000;
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++
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++ return IIO_VAL_INT_PLUS_MICRO;
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++ }
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++ default:
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++ return -EINVAL;
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++ }
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++ }
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++
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++ return -EINVAL;
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++}
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++
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++static const struct iio_info sps30_info = {
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++ .read_raw = sps30_read_raw,
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++};
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++
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++#define SPS30_CHAN(_index, _mod) { \
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++ .type = IIO_MASSCONCENTRATION, \
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++ .modified = 1, \
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++ .channel2 = IIO_MOD_ ## _mod, \
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++ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
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++ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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++ .address = _mod, \
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++ .scan_index = _index, \
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++ .scan_type = { \
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++ .sign = 'u', \
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++ .realbits = 19, \
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++ .storagebits = 32, \
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++ .endianness = IIO_CPU, \
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++ }, \
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++}
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++
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++static const struct iio_chan_spec sps30_channels[] = {
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++ SPS30_CHAN(0, PM1),
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++ SPS30_CHAN(1, PM2P5),
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++ SPS30_CHAN(2, PM4),
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++ SPS30_CHAN(3, PM10),
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++ IIO_CHAN_SOFT_TIMESTAMP(4),
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++};
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++
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++static void sps30_stop_meas(void *data)
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++{
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++ struct sps30_state *state = data;
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++
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++ sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
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++}
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++
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++static const unsigned long sps30_scan_masks[] = { 0x0f, 0x00 };
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++
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++static int sps30_probe(struct i2c_client *client)
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++{
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++ struct iio_dev *indio_dev;
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++ struct sps30_state *state;
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++ u8 buf[32];
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++ int ret;
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++
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++ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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++ return -EOPNOTSUPP;
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++
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++ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*state));
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++ if (!indio_dev)
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++ return -ENOMEM;
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++
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++ state = iio_priv(indio_dev);
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++ i2c_set_clientdata(client, indio_dev);
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++ state->client = client;
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++ indio_dev->dev.parent = &client->dev;
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++ indio_dev->info = &sps30_info;
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++ indio_dev->name = client->name;
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++ indio_dev->channels = sps30_channels;
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++ indio_dev->num_channels = ARRAY_SIZE(sps30_channels);
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++ indio_dev->modes = INDIO_DIRECT_MODE;
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++ indio_dev->available_scan_masks = sps30_scan_masks;
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++
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++ mutex_init(&state->lock);
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|
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++ crc8_populate_msb(sps30_crc8_table, SPS30_CRC8_POLYNOMIAL);
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|
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++
|
|
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++ ret = sps30_do_cmd(state, SPS30_RESET, NULL, 0);
|
|
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++ if (ret) {
|
|
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++ dev_err(&client->dev, "failed to reset device\n");
|
|
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++ return ret;
|
|
|
++ }
|
|
|
++ msleep(300);
|
|
|
++ /*
|
|
|
++ * Power-on-reset causes sensor to produce some glitch on i2c bus and
|
|
|
++ * some controllers end up in error state. Recover simply by placing
|
|
|
++ * some data on the bus, for example STOP_MEAS command, which
|
|
|
++ * is NOP in this case.
|
|
|
++ */
|
|
|
++ sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
|
|
|
++
|
|
|
++ ret = sps30_do_cmd(state, SPS30_READ_SERIAL, buf, sizeof(buf));
|
|
|
++ if (ret) {
|
|
|
++ dev_err(&client->dev, "failed to read serial number\n");
|
|
|
++ return ret;
|
|
|
++ }
|
|
|
++ /* returned serial number is already NUL terminated */
|
|
|
++ dev_info(&client->dev, "serial number: %s\n", buf);
|
|
|
++
|
|
|
++ ret = sps30_do_cmd(state, SPS30_START_MEAS, NULL, 0);
|
|
|
++ if (ret) {
|
|
|
++ dev_err(&client->dev, "failed to start measurement\n");
|
|
|
++ return ret;
|
|
|
++ }
|
|
|
++
|
|
|
++ ret = devm_add_action_or_reset(&client->dev, sps30_stop_meas, state);
|
|
|
++ if (ret)
|
|
|
++ return ret;
|
|
|
++
|
|
|
++ ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
|
|
|
++ sps30_trigger_handler, NULL);
|
|
|
++ if (ret)
|
|
|
++ return ret;
|
|
|
++
|
|
|
++ return devm_iio_device_register(&client->dev, indio_dev);
|
|
|
++}
|
|
|
++
|
|
|
++static const struct i2c_device_id sps30_id[] = {
|
|
|
++ { "sps30" },
|
|
|
++ { }
|
|
|
++};
|
|
|
++MODULE_DEVICE_TABLE(i2c, sps30_id);
|
|
|
++
|
|
|
++static const struct of_device_id sps30_of_match[] = {
|
|
|
++ { .compatible = "sensirion,sps30" },
|
|
|
++ { }
|
|
|
++};
|
|
|
++MODULE_DEVICE_TABLE(of, sps30_of_match);
|
|
|
++
|
|
|
++static struct i2c_driver sps30_driver = {
|
|
|
++ .driver = {
|
|
|
++ .name = "sps30",
|
|
|
++ .of_match_table = sps30_of_match,
|
|
|
++ },
|
|
|
++ .id_table = sps30_id,
|
|
|
++ .probe_new = sps30_probe,
|
|
|
++};
|
|
|
++module_i2c_driver(sps30_driver);
|
|
|
++
|
|
|
++MODULE_AUTHOR("Tomasz Duszynski <[email protected]>");
|
|
|
++MODULE_DESCRIPTION("Sensirion SPS30 particulate matter sensor driver");
|
|
|
++MODULE_LICENSE("GPL v2");
|
Petr Štetiar