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e64564920a
Refreshed all patches. Compile-tested on: cns3xxx Runtime-tested on: cns3xxx Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
294 lines
8.4 KiB
Diff
294 lines
8.4 KiB
Diff
From 62129a0849d27cc94ced832bcf9dcde283dcbe08 Mon Sep 17 00:00:00 2001
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From: Tomasz Duszynski <tduszyns@gmail.com>
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Date: Tue, 15 Jan 2019 20:00:06 +0100
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Subject: [PATCH] iio: chemical: sps30: allow changing self cleaning period
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Sensor can periodically trigger self cleaning. Period can be changed by
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writing a new value to a dedicated attribute. Upon attribute read
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current period gets returned.
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Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
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Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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---
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Documentation/ABI/testing/sysfs-bus-iio-sps30 | 20 +++
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drivers/iio/chemical/sps30.c | 143 +++++++++++++++---
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2 files changed, 145 insertions(+), 18 deletions(-)
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--- a/Documentation/ABI/testing/sysfs-bus-iio-sps30
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+++ b/Documentation/ABI/testing/sysfs-bus-iio-sps30
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@@ -6,3 +6,23 @@ Description:
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Writing 1 starts sensor self cleaning. Internal fan accelerates
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to its maximum speed and keeps spinning for about 10 seconds in
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order to blow out accumulated dust.
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+
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+What: /sys/bus/iio/devices/iio:deviceX/cleaning_period
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+Date: January 2019
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+KernelVersion: 5.1
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+Contact: linux-iio@vger.kernel.org
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+Description:
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+ Sensor is capable of triggering self cleaning periodically.
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+ Period can be changed by writing a new value here. Upon reading
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+ the current one is returned. Units are seconds.
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+
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+ Writing 0 disables periodical self cleaning entirely.
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+
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+What: /sys/bus/iio/devices/iio:deviceX/cleaning_period_available
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+Date: January 2019
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+KernelVersion: 5.1
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+Contact: linux-iio@vger.kernel.org
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+Description:
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+ The range of available values in seconds represented as the
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+ minimum value, the step and the maximum value, all enclosed in
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+ square brackets.
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--- a/drivers/iio/chemical/sps30.c
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+++ b/drivers/iio/chemical/sps30.c
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@@ -5,9 +5,6 @@
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* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
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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 reading/setting auto cleaning interval
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@@ -21,6 +18,7 @@
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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/kernel.h>
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#include <linux/module.h>
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#define SPS30_CRC8_POLYNOMIAL 0x31
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@@ -28,6 +26,9 @@
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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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+/* minimum and maximum self cleaning periods in seconds */
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+#define SPS30_AUTO_CLEANING_PERIOD_MIN 0
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+#define SPS30_AUTO_CLEANING_PERIOD_MAX 604800
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/* SPS30 commands */
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#define SPS30_START_MEAS 0x0010
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@@ -37,6 +38,9 @@
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#define SPS30_READ_DATA 0x0300
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#define SPS30_READ_SERIAL 0xd033
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#define SPS30_START_FAN_CLEANING 0x5607
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+#define SPS30_AUTO_CLEANING_PERIOD 0x8004
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+/* not a sensor command per se, used only to distinguish write from read */
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+#define SPS30_READ_AUTO_CLEANING_PERIOD 0x8005
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enum {
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PM1,
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@@ -45,6 +49,11 @@ enum {
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PM10,
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};
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+enum {
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+ RESET,
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+ MEASURING,
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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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@@ -52,6 +61,7 @@ struct sps30_state {
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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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+ int state;
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};
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DECLARE_CRC8_TABLE(sps30_crc8_table);
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@@ -107,6 +117,9 @@ static int sps30_do_cmd(struct sps30_sta
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case SPS30_START_FAN_CLEANING:
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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_AUTO_CLEANING_PERIOD:
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+ buf[0] = SPS30_AUTO_CLEANING_PERIOD >> 8;
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+ buf[1] = (u8)SPS30_AUTO_CLEANING_PERIOD;
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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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@@ -114,6 +127,15 @@ static int sps30_do_cmd(struct sps30_sta
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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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+ case SPS30_AUTO_CLEANING_PERIOD:
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+ buf[2] = data[0];
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+ buf[3] = data[1];
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+ buf[4] = crc8(sps30_crc8_table, &buf[2], 2, CRC8_INIT_VALUE);
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+ buf[5] = data[2];
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+ buf[6] = data[3];
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+ buf[7] = crc8(sps30_crc8_table, &buf[5], 2, CRC8_INIT_VALUE);
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+ ret = sps30_write_then_read(state, buf, 8, NULL, 0);
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+ break;
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}
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if (ret)
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@@ -170,6 +192,14 @@ static int sps30_do_meas(struct sps30_st
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int i, ret, tries = 5;
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u8 tmp[16];
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+ if (state->state == RESET) {
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+ ret = sps30_do_cmd(state, SPS30_START_MEAS, NULL, 0);
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+ if (ret)
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+ return ret;
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+
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+ state->state = MEASURING;
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+ }
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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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@@ -276,6 +306,24 @@ static int sps30_read_raw(struct iio_dev
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return -EINVAL;
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}
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+static int sps30_do_cmd_reset(struct sps30_state *state)
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+{
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+ int ret;
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+
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+ ret = sps30_do_cmd(state, SPS30_RESET, NULL, 0);
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+ msleep(300);
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+ /*
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+ * Power-on-reset causes sensor to produce some glitch on i2c bus and
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+ * some controllers end up in error state. Recover simply by placing
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+ * some data on the bus, for example STOP_MEAS command, which
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+ * is NOP in this case.
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+ */
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+ sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
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+ state->state = RESET;
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+
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+ return ret;
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+}
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+
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static ssize_t start_cleaning_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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@@ -296,10 +344,82 @@ static ssize_t start_cleaning_store(stru
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return len;
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}
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+static ssize_t cleaning_period_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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+ struct sps30_state *state = iio_priv(indio_dev);
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+ u8 tmp[4];
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+ int ret;
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+
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+ mutex_lock(&state->lock);
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+ ret = sps30_do_cmd(state, SPS30_READ_AUTO_CLEANING_PERIOD, tmp, 4);
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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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+ return sprintf(buf, "%d\n", get_unaligned_be32(tmp));
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+}
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+
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+static ssize_t cleaning_period_store(struct device *dev,
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+ struct device_attribute *attr,
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+ const char *buf, size_t len)
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+{
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+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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+ struct sps30_state *state = iio_priv(indio_dev);
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+ int val, ret;
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+ u8 tmp[4];
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+
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+ if (kstrtoint(buf, 0, &val))
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+ return -EINVAL;
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+
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+ if ((val < SPS30_AUTO_CLEANING_PERIOD_MIN) ||
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+ (val > SPS30_AUTO_CLEANING_PERIOD_MAX))
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+ return -EINVAL;
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+
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+ put_unaligned_be32(val, tmp);
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+
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+ mutex_lock(&state->lock);
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+ ret = sps30_do_cmd(state, SPS30_AUTO_CLEANING_PERIOD, tmp, 0);
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+ if (ret) {
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+ mutex_unlock(&state->lock);
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+ return ret;
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+ }
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+
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+ msleep(20);
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+
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+ /*
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+ * sensor requires reset in order to return up to date self cleaning
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+ * period
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+ */
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+ ret = sps30_do_cmd_reset(state);
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+ if (ret)
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+ dev_warn(dev,
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+ "period changed but reads will return the old value\n");
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+
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+ mutex_unlock(&state->lock);
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+
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+ return len;
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+}
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+
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+static ssize_t cleaning_period_available_show(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ return snprintf(buf, PAGE_SIZE, "[%d %d %d]\n",
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+ SPS30_AUTO_CLEANING_PERIOD_MIN, 1,
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+ SPS30_AUTO_CLEANING_PERIOD_MAX);
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+}
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+
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static IIO_DEVICE_ATTR_WO(start_cleaning, 0);
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+static IIO_DEVICE_ATTR_RW(cleaning_period, 0);
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+static IIO_DEVICE_ATTR_RO(cleaning_period_available, 0);
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static struct attribute *sps30_attrs[] = {
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&iio_dev_attr_start_cleaning.dev_attr.attr,
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+ &iio_dev_attr_cleaning_period.dev_attr.attr,
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+ &iio_dev_attr_cleaning_period_available.dev_attr.attr,
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NULL
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};
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@@ -362,6 +482,7 @@ static int sps30_probe(struct i2c_client
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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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+ state->state = RESET;
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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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@@ -373,19 +494,11 @@ static int sps30_probe(struct i2c_client
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mutex_init(&state->lock);
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crc8_populate_msb(sps30_crc8_table, SPS30_CRC8_POLYNOMIAL);
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- ret = sps30_do_cmd(state, SPS30_RESET, NULL, 0);
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+ ret = sps30_do_cmd_reset(state);
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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;
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}
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- msleep(300);
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- /*
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- * Power-on-reset causes sensor to produce some glitch on i2c bus and
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- * some controllers end up in error state. Recover simply by placing
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- * some data on the bus, for example STOP_MEAS command, which
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- * is NOP in this case.
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- */
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- sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
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ret = sps30_do_cmd(state, SPS30_READ_SERIAL, buf, sizeof(buf));
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if (ret) {
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@@ -395,12 +508,6 @@ static int sps30_probe(struct i2c_client
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/* returned serial number is already NUL terminated */
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dev_info(&client->dev, "serial number: %s\n", buf);
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- ret = sps30_do_cmd(state, SPS30_START_MEAS, NULL, 0);
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- if (ret) {
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- dev_err(&client->dev, "failed to start measurement\n");
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- return ret;
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- }
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-
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ret = devm_add_action_or_reset(&client->dev, sps30_stop_meas, state);
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if (ret)
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return ret;
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