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Diffstat (limited to 'target/linux/generic/backport-4.19/502-v5.1-iio-chemical-sps30-allow-changing-self-cleaning-peri.patch')
-rw-r--r--target/linux/generic/backport-4.19/502-v5.1-iio-chemical-sps30-allow-changing-self-cleaning-peri.patch293
1 files changed, 0 insertions, 293 deletions
diff --git a/target/linux/generic/backport-4.19/502-v5.1-iio-chemical-sps30-allow-changing-self-cleaning-peri.patch b/target/linux/generic/backport-4.19/502-v5.1-iio-chemical-sps30-allow-changing-self-cleaning-peri.patch
deleted file mode 100644
index 3a1335ba44..0000000000
--- a/target/linux/generic/backport-4.19/502-v5.1-iio-chemical-sps30-allow-changing-self-cleaning-peri.patch
+++ /dev/null
@@ -1,293 +0,0 @@
-From 62129a0849d27cc94ced832bcf9dcde283dcbe08 Mon Sep 17 00:00:00 2001
-From: Tomasz Duszynski <tduszyns@gmail.com>
-Date: Tue, 15 Jan 2019 20:00:06 +0100
-Subject: [PATCH] iio: chemical: sps30: allow changing self cleaning period
-
-Sensor can periodically trigger self cleaning. Period can be changed by
-writing a new value to a dedicated attribute. Upon attribute read
-current period gets returned.
-
-Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
-Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
----
- Documentation/ABI/testing/sysfs-bus-iio-sps30 | 20 +++
- drivers/iio/chemical/sps30.c | 143 +++++++++++++++---
- 2 files changed, 145 insertions(+), 18 deletions(-)
-
---- a/Documentation/ABI/testing/sysfs-bus-iio-sps30
-+++ b/Documentation/ABI/testing/sysfs-bus-iio-sps30
-@@ -6,3 +6,23 @@ Description:
- Writing 1 starts sensor self cleaning. Internal fan accelerates
- to its maximum speed and keeps spinning for about 10 seconds in
- order to blow out accumulated dust.
-+
-+What: /sys/bus/iio/devices/iio:deviceX/cleaning_period
-+Date: January 2019
-+KernelVersion: 5.1
-+Contact: linux-iio@vger.kernel.org
-+Description:
-+ Sensor is capable of triggering self cleaning periodically.
-+ Period can be changed by writing a new value here. Upon reading
-+ the current one is returned. Units are seconds.
-+
-+ Writing 0 disables periodical self cleaning entirely.
-+
-+What: /sys/bus/iio/devices/iio:deviceX/cleaning_period_available
-+Date: January 2019
-+KernelVersion: 5.1
-+Contact: linux-iio@vger.kernel.org
-+Description:
-+ The range of available values in seconds represented as the
-+ minimum value, the step and the maximum value, all enclosed in
-+ square brackets.
---- a/drivers/iio/chemical/sps30.c
-+++ b/drivers/iio/chemical/sps30.c
-@@ -5,9 +5,6 @@
- * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
- *
- * I2C slave address: 0x69
-- *
-- * TODO:
-- * - support for reading/setting auto cleaning interval
- */
-
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-@@ -21,6 +18,7 @@
- #include <linux/iio/sysfs.h>
- #include <linux/iio/trigger_consumer.h>
- #include <linux/iio/triggered_buffer.h>
-+#include <linux/kernel.h>
- #include <linux/module.h>
-
- #define SPS30_CRC8_POLYNOMIAL 0x31
-@@ -28,6 +26,9 @@
- #define SPS30_MAX_READ_SIZE 48
- /* sensor measures reliably up to 3000 ug / m3 */
- #define SPS30_MAX_PM 3000
-+/* minimum and maximum self cleaning periods in seconds */
-+#define SPS30_AUTO_CLEANING_PERIOD_MIN 0
-+#define SPS30_AUTO_CLEANING_PERIOD_MAX 604800
-
- /* SPS30 commands */
- #define SPS30_START_MEAS 0x0010
-@@ -37,6 +38,9 @@
- #define SPS30_READ_DATA 0x0300
- #define SPS30_READ_SERIAL 0xd033
- #define SPS30_START_FAN_CLEANING 0x5607
-+#define SPS30_AUTO_CLEANING_PERIOD 0x8004
-+/* not a sensor command per se, used only to distinguish write from read */
-+#define SPS30_READ_AUTO_CLEANING_PERIOD 0x8005
-
- enum {
- PM1,
-@@ -45,6 +49,11 @@ enum {
- PM10,
- };
-
-+enum {
-+ RESET,
-+ MEASURING,
-+};
-+
- struct sps30_state {
- struct i2c_client *client;
- /*
-@@ -52,6 +61,7 @@ struct sps30_state {
- * Must be held whenever sequence of commands is to be executed.
- */
- struct mutex lock;
-+ int state;
- };
-
- DECLARE_CRC8_TABLE(sps30_crc8_table);
-@@ -107,6 +117,9 @@ static int sps30_do_cmd(struct sps30_sta
- case SPS30_START_FAN_CLEANING:
- ret = sps30_write_then_read(state, buf, 2, NULL, 0);
- break;
-+ case SPS30_READ_AUTO_CLEANING_PERIOD:
-+ buf[0] = SPS30_AUTO_CLEANING_PERIOD >> 8;
-+ buf[1] = (u8)SPS30_AUTO_CLEANING_PERIOD;
- case SPS30_READ_DATA_READY_FLAG:
- case SPS30_READ_DATA:
- case SPS30_READ_SERIAL:
-@@ -114,6 +127,15 @@ static int sps30_do_cmd(struct sps30_sta
- size += size / 2;
- ret = sps30_write_then_read(state, buf, 2, buf, size);
- break;
-+ case SPS30_AUTO_CLEANING_PERIOD:
-+ buf[2] = data[0];
-+ buf[3] = data[1];
-+ buf[4] = crc8(sps30_crc8_table, &buf[2], 2, CRC8_INIT_VALUE);
-+ buf[5] = data[2];
-+ buf[6] = data[3];
-+ buf[7] = crc8(sps30_crc8_table, &buf[5], 2, CRC8_INIT_VALUE);
-+ ret = sps30_write_then_read(state, buf, 8, NULL, 0);
-+ break;
- }
-
- if (ret)
-@@ -170,6 +192,14 @@ static int sps30_do_meas(struct sps30_st
- int i, ret, tries = 5;
- u8 tmp[16];
-
-+ if (state->state == RESET) {
-+ ret = sps30_do_cmd(state, SPS30_START_MEAS, NULL, 0);
-+ if (ret)
-+ return ret;
-+
-+ state->state = MEASURING;
-+ }
-+
- while (tries--) {
- ret = sps30_do_cmd(state, SPS30_READ_DATA_READY_FLAG, tmp, 2);
- if (ret)
-@@ -276,6 +306,24 @@ static int sps30_read_raw(struct iio_dev
- return -EINVAL;
- }
-
-+static int sps30_do_cmd_reset(struct sps30_state *state)
-+{
-+ int ret;
-+
-+ ret = sps30_do_cmd(state, SPS30_RESET, NULL, 0);
-+ 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);
-+ state->state = RESET;
-+
-+ return ret;
-+}
-+
- static ssize_t start_cleaning_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
-@@ -296,10 +344,82 @@ static ssize_t start_cleaning_store(stru
- return len;
- }
-
-+static ssize_t cleaning_period_show(struct device *dev,
-+ struct device_attribute *attr,
-+ char *buf)
-+{
-+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-+ struct sps30_state *state = iio_priv(indio_dev);
-+ u8 tmp[4];
-+ int ret;
-+
-+ mutex_lock(&state->lock);
-+ ret = sps30_do_cmd(state, SPS30_READ_AUTO_CLEANING_PERIOD, tmp, 4);
-+ mutex_unlock(&state->lock);
-+ if (ret)
-+ return ret;
-+
-+ return sprintf(buf, "%d\n", get_unaligned_be32(tmp));
-+}
-+
-+static ssize_t cleaning_period_store(struct device *dev,
-+ struct device_attribute *attr,
-+ const char *buf, size_t len)
-+{
-+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
-+ struct sps30_state *state = iio_priv(indio_dev);
-+ int val, ret;
-+ u8 tmp[4];
-+
-+ if (kstrtoint(buf, 0, &val))
-+ return -EINVAL;
-+
-+ if ((val < SPS30_AUTO_CLEANING_PERIOD_MIN) ||
-+ (val > SPS30_AUTO_CLEANING_PERIOD_MAX))
-+ return -EINVAL;
-+
-+ put_unaligned_be32(val, tmp);
-+
-+ mutex_lock(&state->lock);
-+ ret = sps30_do_cmd(state, SPS30_AUTO_CLEANING_PERIOD, tmp, 0);
-+ if (ret) {
-+ mutex_unlock(&state->lock);
-+ return ret;
-+ }
-+
-+ msleep(20);
-+
-+ /*
-+ * sensor requires reset in order to return up to date self cleaning
-+ * period
-+ */
-+ ret = sps30_do_cmd_reset(state);
-+ if (ret)
-+ dev_warn(dev,
-+ "period changed but reads will return the old value\n");
-+
-+ mutex_unlock(&state->lock);
-+
-+ return len;
-+}
-+
-+static ssize_t cleaning_period_available_show(struct device *dev,
-+ struct device_attribute *attr,
-+ char *buf)
-+{
-+ return snprintf(buf, PAGE_SIZE, "[%d %d %d]\n",
-+ SPS30_AUTO_CLEANING_PERIOD_MIN, 1,
-+ SPS30_AUTO_CLEANING_PERIOD_MAX);
-+}
-+
- static IIO_DEVICE_ATTR_WO(start_cleaning, 0);
-+static IIO_DEVICE_ATTR_RW(cleaning_period, 0);
-+static IIO_DEVICE_ATTR_RO(cleaning_period_available, 0);
-
- static struct attribute *sps30_attrs[] = {
- &iio_dev_attr_start_cleaning.dev_attr.attr,
-+ &iio_dev_attr_cleaning_period.dev_attr.attr,
-+ &iio_dev_attr_cleaning_period_available.dev_attr.attr,
- NULL
- };
-
-@@ -362,6 +482,7 @@ static int sps30_probe(struct i2c_client
- state = iio_priv(indio_dev);
- i2c_set_clientdata(client, indio_dev);
- state->client = client;
-+ state->state = RESET;
- indio_dev->dev.parent = &client->dev;
- indio_dev->info = &sps30_info;
- indio_dev->name = client->name;
-@@ -373,19 +494,11 @@ static int sps30_probe(struct i2c_client
- mutex_init(&state->lock);
- crc8_populate_msb(sps30_crc8_table, SPS30_CRC8_POLYNOMIAL);
-
-- ret = sps30_do_cmd(state, SPS30_RESET, NULL, 0);
-+ ret = sps30_do_cmd_reset(state);
- if (ret) {
- dev_err(&client->dev, "failed to reset device\n");
- 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) {
-@@ -395,12 +508,6 @@ static int sps30_probe(struct i2c_client
- /* 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;
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-26 11:10:21 +0000