* Re: [PATCH] iio: hid: Add humidity sensor support
2017-03-15 11:15 [PATCH] iio: hid: Add humidity sensor support Song Hongyan
@ 2017-03-15 8:21 ` Peter Meerwald-Stadler
0 siblings, 0 replies; 5+ messages in thread
From: Peter Meerwald-Stadler @ 2017-03-15 8:21 UTC (permalink / raw)
To: Song Hongyan
Cc: linux-input-u79uwXL29TY76Z2rM5mHXA,
linux-iio-u79uwXL29TY76Z2rM5mHXA, jikos-DgEjT+Ai2ygdnm+yROfE0A,
jic23-DgEjT+Ai2ygdnm+yROfE0A,
srinivas.pandruvada-ral2JQCrhuEAvxtiuMwx3w
> Environmental humidity sensor is a hid defined sensor,
> it shows raw humidity measurement of air.
comments below
> More information can be found in:
> http://www.usb.org/developers/hidpage/HUTRR39b.pdf
>
> According to IIO ABI definition, humidityrelative data output unit is
> milli percent. Add the unit convert from percent to milli percent.
>
> Signed-off-by: Song Hongyan <hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
> .../iio/common/hid-sensors/hid-sensor-attributes.c | 2 +
> drivers/iio/humidity/Kconfig | 14 +
> drivers/iio/humidity/Makefile | 3 +
> drivers/iio/humidity/hid-sensor-humidity.c | 314 +++++++++++++++++++++
> include/linux/hid-sensor-ids.h | 4 +
> 5 files changed, 337 insertions(+)
> create mode 100644 drivers/iio/humidity/hid-sensor-humidity.c
>
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index 7afdac42..4f280ae 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -62,6 +62,8 @@
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
> 1000000, 0},
> +
> + {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
> };
>
> static int pow_10(unsigned power)
> diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
> index 912477d..14b9ce4 100644
> --- a/drivers/iio/humidity/Kconfig
> +++ b/drivers/iio/humidity/Kconfig
> @@ -36,6 +36,20 @@ config HDC100X
> To compile this driver as a module, choose M here: the module
> will be called hdc100x.
>
> +config HID_SENSOR_HUMIDITY
> + tristate "HID Environmental humidity sensor"
> + depends on HID_SENSOR_HUB
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + select HID_SENSOR_IIO_COMMON
> + select HID_SENSOR_IIO_TRIGGER
> + help
> + Say yes here to build support for the HID SENSOR
> + humidity driver
> +
> + To compile this driver as a module, choose M here: the module
> + will be called hid-sensor-humidity.
> +
> config HTS221
> tristate "STMicroelectronics HTS221 sensor Driver"
> depends on (I2C || SPI)
> diff --git a/drivers/iio/humidity/Makefile b/drivers/iio/humidity/Makefile
> index a6850e4..be0dede 100644
> --- a/drivers/iio/humidity/Makefile
> +++ b/drivers/iio/humidity/Makefile
> @@ -5,6 +5,7 @@
> obj-$(CONFIG_AM2315) += am2315.o
> obj-$(CONFIG_DHT11) += dht11.o
> obj-$(CONFIG_HDC100X) += hdc100x.o
> +obj-$(CONFIG_HID_SENSOR_HUMIDITY) += hid-sensor-humidity.o
>
> hts221-y := hts221_core.o \
> hts221_buffer.o
> @@ -15,3 +16,5 @@ obj-$(CONFIG_HTS221_SPI) += hts221_spi.o
> obj-$(CONFIG_HTU21) += htu21.o
> obj-$(CONFIG_SI7005) += si7005.o
> obj-$(CONFIG_SI7020) += si7020.o
> +
> +ccflags-y += -I$(srctree)/drivers/iio/common/hid-sensors
> diff --git a/drivers/iio/humidity/hid-sensor-humidity.c b/drivers/iio/humidity/hid-sensor-humidity.c
> new file mode 100644
> index 0000000..bff4ceb
> --- /dev/null
> +++ b/drivers/iio/humidity/hid-sensor-humidity.c
> @@ -0,0 +1,314 @@
> +/*
> + * HID Sensors Driver
> + * Copyright (c) 2017, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.
> + */
> +#include <linux/device.h>
> +#include <linux/hid-sensor-hub.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include "hid-sensor-trigger.h"
> +
> +struct humidity_state {
we want a consistent prefix, i.e. hid_humidity_
> + struct hid_sensor_common common_attributes;
> + struct hid_sensor_hub_attribute_info humidity_attr;
> + s32 humidity_data;
> + int scale_pre_decml;
> + int scale_post_decml;
> + int scale_precision;
> + int value_offset;
> +};
> +
> +/* Channel definitions */
> +static const struct iio_chan_spec humidity_channels[] = {
> + {
> + .type = IIO_HUMIDITYRELATIVE,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE) |
> + BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> + BIT(IIO_CHAN_INFO_HYSTERESIS),
> + },
> + IIO_CHAN_SOFT_TIMESTAMP(3)
should be 1
> +};
> +
> +/* Adjust channel real bits based on report descriptor */
> +static void humidity_adjust_channel_bit_mask(struct iio_chan_spec *channels,
> + int channel, int size)
> +{
> + channels[channel].scan_type.sign = 's';
> + /* Real storage bits will change based on the report desc. */
> + channels[channel].scan_type.realbits = size * 8;
> + /* Maximum size of a sample to capture is s32 */
> + channels[channel].scan_type.storagebits = sizeof(s32) * 8;
> +}
> +
> +static int humidity_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type != IIO_HUMIDITYRELATIVE)
> + return -EINVAL;
> + hid_sensor_power_state(&humid_st->common_attributes, true);
> + *val = sensor_hub_input_attr_get_raw_value(
> + humid_st->common_attributes.hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + humid_st->humidity_attr.report_id,
> + SENSOR_HUB_SYNC);
> + hid_sensor_power_state(&humid_st->common_attributes, false);
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SCALE:
> + *val = humid_st->scale_pre_decml;
> + *val2 = humid_st->scale_post_decml;
> +
> + return humid_st->scale_precision;
> +
> + case IIO_CHAN_INFO_OFFSET:
> + *val = humid_st->value_offset;
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_read_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_read_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int humidity_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_write_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_write_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_info humidity_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &humidity_read_raw,
> + .write_raw = &humidity_write_raw,
> +};
> +
> +/* Callback handler to send event after all samples are received and captured */
> +static int humidity_proc_event(struct hid_sensor_hub_device *hsdev,
> + unsigned int usage_id, void *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + if (atomic_read(&humid_st->common_attributes.data_ready))
> + iio_push_to_buffers_with_timestamp(indio_dev,
> + &humid_st->humidity_data,
> + iio_get_time_ns(indio_dev));
> +
> + return 0;
> +}
> +
> +/* Capture samples in local storage */
> +static int humidity_capture_sample(struct hid_sensor_hub_device *hsdev,
> + unsigned int usage_id, size_t raw_len,
> + char *raw_data, void *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (usage_id) {
> + case HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY:
> + humid_st->humidity_data = *(s32 *)raw_data;
> +
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +/* Parse report which is specific to an usage id*/
space missing before */
> +static int humidity_parse_report(struct platform_device *pdev,
> + struct hid_sensor_hub_device *hsdev,
> + struct iio_chan_spec *channels,
> + unsigned int usage_id,
> + struct humidity_state *st)
> +{
> + int ret;
> +
> + ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
> + usage_id,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->humidity_attr);
> + if (ret < 0)
> + return ret;
> +
> + humidity_adjust_channel_bit_mask(channels, 0, st->humidity_attr.size);
> +
> + st->scale_precision = hid_sensor_format_scale(
> + HID_USAGE_SENSOR_HUMIDITY,
> + &st->humidity_attr,
> + &st->scale_pre_decml,
> + &st->scale_post_decml);
> +
> + /* Set Sensitivity field ids, when there is no individual modifier */
> + if (st->common_attributes.sensitivity.index < 0)
> + sensor_hub_input_get_attribute_info(hsdev,
> + HID_FEATURE_REPORT, usage_id,
> + HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->common_attributes.sensitivity);
> +
> + return ret;
> +}
> +
> +static struct hid_sensor_hub_callbacks humidity_callbacks = {
> + .send_event = &humidity_proc_event,
> + .capture_sample = &humidity_capture_sample,
> +};
> +
> +/* Function to initialize the processing for usage id */
> +static int hid_humidity_probe(struct platform_device *pdev)
> +{
> + static const char *name = "humidity";
most drivers use a #define and put it somewhere near the top of the code
> + struct iio_dev *indio_dev;
> + struct humidity_state *humid_st;
> + struct iio_chan_spec *humid_chans;
> + struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*humid_st));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + humid_st = iio_priv(indio_dev);
> + humid_st->common_attributes.hsdev = hsdev;
> + humid_st->common_attributes.pdev = pdev;
> +
> + ret = hid_sensor_parse_common_attributes(hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + humid_chans = devm_kmemdup(&indio_dev->dev, humidity_channels,
> + sizeof(humidity_channels), GFP_KERNEL);
> + if (!humid_chans)
> + return -ENOMEM;
> +
> + ret = humidity_parse_report(pdev, hsdev, humid_chans,
> + HID_USAGE_SENSOR_HUMIDITY, humid_st);
> + if (ret)
> + return ret;
> +
> + indio_dev->channels = humid_chans;
> + indio_dev->num_channels = ARRAY_SIZE(humidity_channels);
> + indio_dev->dev.parent = &pdev->dev;
> + indio_dev->info = &humidity_info;
> + indio_dev->name = name;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
> + &iio_pollfunc_store_time, NULL, NULL);
> + if (ret)
> + return ret;
> +
> + atomic_set(&humid_st->common_attributes.data_ready, 0);
> + ret = hid_sensor_setup_trigger(indio_dev, name,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + platform_set_drvdata(pdev, indio_dev);
> +
> + humidity_callbacks.pdev = pdev;
> + ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY,
> + &humidity_callbacks);
> + if (ret)
> + goto error_remove_trigger;
> +
> + ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
don't use devm_iio_device_register() if you need _remove()
> + if (ret)
> + goto error_remove_callback;
> +
> + return ret;
> +
> +error_remove_callback:
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> +error_remove_trigger:
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> + return ret;
> +}
> +
> +/* Function to deinitialize the processing for usage id */
> +static int hid_humidity_remove(struct platform_device *pdev)
> +{
> + struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id hid_humidity_ids[] = {
> + {
> + /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
> + .name = "HID-SENSOR-200032",
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, hid_humidity_ids);
> +
> +static struct platform_driver hid_humidity_platform_driver = {
> + .id_table = hid_humidity_ids,
> + .driver = {
> + .name = "humidity-sensor",
> + .pm = &hid_sensor_pm_ops,
> + },
> + .probe = hid_humidity_probe,
> + .remove = hid_humidity_remove,
> +};
> +module_platform_driver(hid_humidity_platform_driver);
> +
> +MODULE_DESCRIPTION("HID Environmental humidity sensor");
> +MODULE_AUTHOR("Song Hongyan <hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
> index 30c7dc4..719c928 100644
> --- a/include/linux/hid-sensor-ids.h
> +++ b/include/linux/hid-sensor-ids.h
> @@ -45,6 +45,10 @@
> #define HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE 0x200430
> #define HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE 0x200431
>
> +/* humidity */
> +#define HID_USAGE_SENSOR_HUMIDITY 0x200032
> +#define HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY 0x200433
> +
> /* Gyro 3D: (200076) */
> #define HID_USAGE_SENSOR_GYRO_3D 0x200076
> #define HID_USAGE_SENSOR_DATA_ANGL_VELOCITY 0x200456
>
--
Peter Meerwald-Stadler
Mobile: +43 664 24 44 418
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iio: hid: Add humidity sensor support
@ 2017-03-15 8:21 ` Peter Meerwald-Stadler
0 siblings, 0 replies; 5+ messages in thread
From: Peter Meerwald-Stadler @ 2017-03-15 8:21 UTC (permalink / raw)
To: Song Hongyan; +Cc: linux-input, linux-iio, jikos, jic23, srinivas.pandruvada
> Environmental humidity sensor is a hid defined sensor,
> it shows raw humidity measurement of air.
comments below
> More information can be found in:
> http://www.usb.org/developers/hidpage/HUTRR39b.pdf
>
> According to IIO ABI definition, humidityrelative data output unit is
> milli percent. Add the unit convert from percent to milli percent.
>
> Signed-off-by: Song Hongyan <hongyan.song@intel.com>
> ---
> .../iio/common/hid-sensors/hid-sensor-attributes.c | 2 +
> drivers/iio/humidity/Kconfig | 14 +
> drivers/iio/humidity/Makefile | 3 +
> drivers/iio/humidity/hid-sensor-humidity.c | 314 +++++++++++++++++++++
> include/linux/hid-sensor-ids.h | 4 +
> 5 files changed, 337 insertions(+)
> create mode 100644 drivers/iio/humidity/hid-sensor-humidity.c
>
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index 7afdac42..4f280ae 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -62,6 +62,8 @@
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
> 1000000, 0},
> +
> + {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
> };
>
> static int pow_10(unsigned power)
> diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
> index 912477d..14b9ce4 100644
> --- a/drivers/iio/humidity/Kconfig
> +++ b/drivers/iio/humidity/Kconfig
> @@ -36,6 +36,20 @@ config HDC100X
> To compile this driver as a module, choose M here: the module
> will be called hdc100x.
>
> +config HID_SENSOR_HUMIDITY
> + tristate "HID Environmental humidity sensor"
> + depends on HID_SENSOR_HUB
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + select HID_SENSOR_IIO_COMMON
> + select HID_SENSOR_IIO_TRIGGER
> + help
> + Say yes here to build support for the HID SENSOR
> + humidity driver
> +
> + To compile this driver as a module, choose M here: the module
> + will be called hid-sensor-humidity.
> +
> config HTS221
> tristate "STMicroelectronics HTS221 sensor Driver"
> depends on (I2C || SPI)
> diff --git a/drivers/iio/humidity/Makefile b/drivers/iio/humidity/Makefile
> index a6850e4..be0dede 100644
> --- a/drivers/iio/humidity/Makefile
> +++ b/drivers/iio/humidity/Makefile
> @@ -5,6 +5,7 @@
> obj-$(CONFIG_AM2315) += am2315.o
> obj-$(CONFIG_DHT11) += dht11.o
> obj-$(CONFIG_HDC100X) += hdc100x.o
> +obj-$(CONFIG_HID_SENSOR_HUMIDITY) += hid-sensor-humidity.o
>
> hts221-y := hts221_core.o \
> hts221_buffer.o
> @@ -15,3 +16,5 @@ obj-$(CONFIG_HTS221_SPI) += hts221_spi.o
> obj-$(CONFIG_HTU21) += htu21.o
> obj-$(CONFIG_SI7005) += si7005.o
> obj-$(CONFIG_SI7020) += si7020.o
> +
> +ccflags-y += -I$(srctree)/drivers/iio/common/hid-sensors
> diff --git a/drivers/iio/humidity/hid-sensor-humidity.c b/drivers/iio/humidity/hid-sensor-humidity.c
> new file mode 100644
> index 0000000..bff4ceb
> --- /dev/null
> +++ b/drivers/iio/humidity/hid-sensor-humidity.c
> @@ -0,0 +1,314 @@
> +/*
> + * HID Sensors Driver
> + * Copyright (c) 2017, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.
> + */
> +#include <linux/device.h>
> +#include <linux/hid-sensor-hub.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include "hid-sensor-trigger.h"
> +
> +struct humidity_state {
we want a consistent prefix, i.e. hid_humidity_
> + struct hid_sensor_common common_attributes;
> + struct hid_sensor_hub_attribute_info humidity_attr;
> + s32 humidity_data;
> + int scale_pre_decml;
> + int scale_post_decml;
> + int scale_precision;
> + int value_offset;
> +};
> +
> +/* Channel definitions */
> +static const struct iio_chan_spec humidity_channels[] = {
> + {
> + .type = IIO_HUMIDITYRELATIVE,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE) |
> + BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> + BIT(IIO_CHAN_INFO_HYSTERESIS),
> + },
> + IIO_CHAN_SOFT_TIMESTAMP(3)
should be 1
> +};
> +
> +/* Adjust channel real bits based on report descriptor */
> +static void humidity_adjust_channel_bit_mask(struct iio_chan_spec *channels,
> + int channel, int size)
> +{
> + channels[channel].scan_type.sign = 's';
> + /* Real storage bits will change based on the report desc. */
> + channels[channel].scan_type.realbits = size * 8;
> + /* Maximum size of a sample to capture is s32 */
> + channels[channel].scan_type.storagebits = sizeof(s32) * 8;
> +}
> +
> +static int humidity_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type != IIO_HUMIDITYRELATIVE)
> + return -EINVAL;
> + hid_sensor_power_state(&humid_st->common_attributes, true);
> + *val = sensor_hub_input_attr_get_raw_value(
> + humid_st->common_attributes.hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + humid_st->humidity_attr.report_id,
> + SENSOR_HUB_SYNC);
> + hid_sensor_power_state(&humid_st->common_attributes, false);
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SCALE:
> + *val = humid_st->scale_pre_decml;
> + *val2 = humid_st->scale_post_decml;
> +
> + return humid_st->scale_precision;
> +
> + case IIO_CHAN_INFO_OFFSET:
> + *val = humid_st->value_offset;
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_read_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_read_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int humidity_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_write_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_write_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_info humidity_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &humidity_read_raw,
> + .write_raw = &humidity_write_raw,
> +};
> +
> +/* Callback handler to send event after all samples are received and captured */
> +static int humidity_proc_event(struct hid_sensor_hub_device *hsdev,
> + unsigned int usage_id, void *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + if (atomic_read(&humid_st->common_attributes.data_ready))
> + iio_push_to_buffers_with_timestamp(indio_dev,
> + &humid_st->humidity_data,
> + iio_get_time_ns(indio_dev));
> +
> + return 0;
> +}
> +
> +/* Capture samples in local storage */
> +static int humidity_capture_sample(struct hid_sensor_hub_device *hsdev,
> + unsigned int usage_id, size_t raw_len,
> + char *raw_data, void *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (usage_id) {
> + case HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY:
> + humid_st->humidity_data = *(s32 *)raw_data;
> +
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +/* Parse report which is specific to an usage id*/
space missing before */
> +static int humidity_parse_report(struct platform_device *pdev,
> + struct hid_sensor_hub_device *hsdev,
> + struct iio_chan_spec *channels,
> + unsigned int usage_id,
> + struct humidity_state *st)
> +{
> + int ret;
> +
> + ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
> + usage_id,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->humidity_attr);
> + if (ret < 0)
> + return ret;
> +
> + humidity_adjust_channel_bit_mask(channels, 0, st->humidity_attr.size);
> +
> + st->scale_precision = hid_sensor_format_scale(
> + HID_USAGE_SENSOR_HUMIDITY,
> + &st->humidity_attr,
> + &st->scale_pre_decml,
> + &st->scale_post_decml);
> +
> + /* Set Sensitivity field ids, when there is no individual modifier */
> + if (st->common_attributes.sensitivity.index < 0)
> + sensor_hub_input_get_attribute_info(hsdev,
> + HID_FEATURE_REPORT, usage_id,
> + HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->common_attributes.sensitivity);
> +
> + return ret;
> +}
> +
> +static struct hid_sensor_hub_callbacks humidity_callbacks = {
> + .send_event = &humidity_proc_event,
> + .capture_sample = &humidity_capture_sample,
> +};
> +
> +/* Function to initialize the processing for usage id */
> +static int hid_humidity_probe(struct platform_device *pdev)
> +{
> + static const char *name = "humidity";
most drivers use a #define and put it somewhere near the top of the code
> + struct iio_dev *indio_dev;
> + struct humidity_state *humid_st;
> + struct iio_chan_spec *humid_chans;
> + struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*humid_st));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + humid_st = iio_priv(indio_dev);
> + humid_st->common_attributes.hsdev = hsdev;
> + humid_st->common_attributes.pdev = pdev;
> +
> + ret = hid_sensor_parse_common_attributes(hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + humid_chans = devm_kmemdup(&indio_dev->dev, humidity_channels,
> + sizeof(humidity_channels), GFP_KERNEL);
> + if (!humid_chans)
> + return -ENOMEM;
> +
> + ret = humidity_parse_report(pdev, hsdev, humid_chans,
> + HID_USAGE_SENSOR_HUMIDITY, humid_st);
> + if (ret)
> + return ret;
> +
> + indio_dev->channels = humid_chans;
> + indio_dev->num_channels = ARRAY_SIZE(humidity_channels);
> + indio_dev->dev.parent = &pdev->dev;
> + indio_dev->info = &humidity_info;
> + indio_dev->name = name;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
> + &iio_pollfunc_store_time, NULL, NULL);
> + if (ret)
> + return ret;
> +
> + atomic_set(&humid_st->common_attributes.data_ready, 0);
> + ret = hid_sensor_setup_trigger(indio_dev, name,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + platform_set_drvdata(pdev, indio_dev);
> +
> + humidity_callbacks.pdev = pdev;
> + ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY,
> + &humidity_callbacks);
> + if (ret)
> + goto error_remove_trigger;
> +
> + ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
don't use devm_iio_device_register() if you need _remove()
> + if (ret)
> + goto error_remove_callback;
> +
> + return ret;
> +
> +error_remove_callback:
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> +error_remove_trigger:
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> + return ret;
> +}
> +
> +/* Function to deinitialize the processing for usage id */
> +static int hid_humidity_remove(struct platform_device *pdev)
> +{
> + struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id hid_humidity_ids[] = {
> + {
> + /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
> + .name = "HID-SENSOR-200032",
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, hid_humidity_ids);
> +
> +static struct platform_driver hid_humidity_platform_driver = {
> + .id_table = hid_humidity_ids,
> + .driver = {
> + .name = "humidity-sensor",
> + .pm = &hid_sensor_pm_ops,
> + },
> + .probe = hid_humidity_probe,
> + .remove = hid_humidity_remove,
> +};
> +module_platform_driver(hid_humidity_platform_driver);
> +
> +MODULE_DESCRIPTION("HID Environmental humidity sensor");
> +MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
> index 30c7dc4..719c928 100644
> --- a/include/linux/hid-sensor-ids.h
> +++ b/include/linux/hid-sensor-ids.h
> @@ -45,6 +45,10 @@
> #define HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE 0x200430
> #define HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE 0x200431
>
> +/* humidity */
> +#define HID_USAGE_SENSOR_HUMIDITY 0x200032
> +#define HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY 0x200433
> +
> /* Gyro 3D: (200076) */
> #define HID_USAGE_SENSOR_GYRO_3D 0x200076
> #define HID_USAGE_SENSOR_DATA_ANGL_VELOCITY 0x200456
>
--
Peter Meerwald-Stadler
Mobile: +43 664 24 44 418
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] iio: hid: Add humidity sensor support
@ 2017-03-15 11:15 Song Hongyan
[not found] ` <1489576515-33346-1-git-send-email-hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
0 siblings, 1 reply; 5+ messages in thread
From: Song Hongyan @ 2017-03-15 11:15 UTC (permalink / raw)
To: linux-input, linux-iio; +Cc: jikos, jic23, srinivas.pandruvada, Song Hongyan
Environmental humidity sensor is a hid defined sensor,
it shows raw humidity measurement of air.
More information can be found in:
http://www.usb.org/developers/hidpage/HUTRR39b.pdf
According to IIO ABI definition, humidityrelative data output unit is
milli percent. Add the unit convert from percent to milli percent.
Signed-off-by: Song Hongyan <hongyan.song@intel.com>
---
.../iio/common/hid-sensors/hid-sensor-attributes.c | 2 +
drivers/iio/humidity/Kconfig | 14 +
drivers/iio/humidity/Makefile | 3 +
drivers/iio/humidity/hid-sensor-humidity.c | 314 +++++++++++++++++++++
include/linux/hid-sensor-ids.h | 4 +
5 files changed, 337 insertions(+)
create mode 100644 drivers/iio/humidity/hid-sensor-humidity.c
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
index 7afdac42..4f280ae 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
@@ -62,6 +62,8 @@
{HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
{HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
1000000, 0},
+
+ {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
};
static int pow_10(unsigned power)
diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
index 912477d..14b9ce4 100644
--- a/drivers/iio/humidity/Kconfig
+++ b/drivers/iio/humidity/Kconfig
@@ -36,6 +36,20 @@ config HDC100X
To compile this driver as a module, choose M here: the module
will be called hdc100x.
+config HID_SENSOR_HUMIDITY
+ tristate "HID Environmental humidity sensor"
+ depends on HID_SENSOR_HUB
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ select HID_SENSOR_IIO_COMMON
+ select HID_SENSOR_IIO_TRIGGER
+ help
+ Say yes here to build support for the HID SENSOR
+ humidity driver
+
+ To compile this driver as a module, choose M here: the module
+ will be called hid-sensor-humidity.
+
config HTS221
tristate "STMicroelectronics HTS221 sensor Driver"
depends on (I2C || SPI)
diff --git a/drivers/iio/humidity/Makefile b/drivers/iio/humidity/Makefile
index a6850e4..be0dede 100644
--- a/drivers/iio/humidity/Makefile
+++ b/drivers/iio/humidity/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_AM2315) += am2315.o
obj-$(CONFIG_DHT11) += dht11.o
obj-$(CONFIG_HDC100X) += hdc100x.o
+obj-$(CONFIG_HID_SENSOR_HUMIDITY) += hid-sensor-humidity.o
hts221-y := hts221_core.o \
hts221_buffer.o
@@ -15,3 +16,5 @@ obj-$(CONFIG_HTS221_SPI) += hts221_spi.o
obj-$(CONFIG_HTU21) += htu21.o
obj-$(CONFIG_SI7005) += si7005.o
obj-$(CONFIG_SI7020) += si7020.o
+
+ccflags-y += -I$(srctree)/drivers/iio/common/hid-sensors
diff --git a/drivers/iio/humidity/hid-sensor-humidity.c b/drivers/iio/humidity/hid-sensor-humidity.c
new file mode 100644
index 0000000..bff4ceb
--- /dev/null
+++ b/drivers/iio/humidity/hid-sensor-humidity.c
@@ -0,0 +1,314 @@
+/*
+ * HID Sensors Driver
+ * Copyright (c) 2017, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.
+ */
+#include <linux/device.h>
+#include <linux/hid-sensor-hub.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include "hid-sensor-trigger.h"
+
+struct humidity_state {
+ struct hid_sensor_common common_attributes;
+ struct hid_sensor_hub_attribute_info humidity_attr;
+ s32 humidity_data;
+ int scale_pre_decml;
+ int scale_post_decml;
+ int scale_precision;
+ int value_offset;
+};
+
+/* Channel definitions */
+static const struct iio_chan_spec humidity_channels[] = {
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+ BIT(IIO_CHAN_INFO_HYSTERESIS),
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(3)
+};
+
+/* Adjust channel real bits based on report descriptor */
+static void humidity_adjust_channel_bit_mask(struct iio_chan_spec *channels,
+ int channel, int size)
+{
+ channels[channel].scan_type.sign = 's';
+ /* Real storage bits will change based on the report desc. */
+ channels[channel].scan_type.realbits = size * 8;
+ /* Maximum size of a sample to capture is s32 */
+ channels[channel].scan_type.storagebits = sizeof(s32) * 8;
+}
+
+static int humidity_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct humidity_state *humid_st = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (chan->type != IIO_HUMIDITYRELATIVE)
+ return -EINVAL;
+ hid_sensor_power_state(&humid_st->common_attributes, true);
+ *val = sensor_hub_input_attr_get_raw_value(
+ humid_st->common_attributes.hsdev,
+ HID_USAGE_SENSOR_HUMIDITY,
+ HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
+ humid_st->humidity_attr.report_id,
+ SENSOR_HUB_SYNC);
+ hid_sensor_power_state(&humid_st->common_attributes, false);
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SCALE:
+ *val = humid_st->scale_pre_decml;
+ *val2 = humid_st->scale_post_decml;
+
+ return humid_st->scale_precision;
+
+ case IIO_CHAN_INFO_OFFSET:
+ *val = humid_st->value_offset;
+
+ return IIO_VAL_INT;
+
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return hid_sensor_read_samp_freq_value(
+ &humid_st->common_attributes, val, val2);
+
+ case IIO_CHAN_INFO_HYSTERESIS:
+ return hid_sensor_read_raw_hyst_value(
+ &humid_st->common_attributes, val, val2);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int humidity_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct humidity_state *humid_st = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return hid_sensor_write_samp_freq_value(
+ &humid_st->common_attributes, val, val2);
+
+ case IIO_CHAN_INFO_HYSTERESIS:
+ return hid_sensor_write_raw_hyst_value(
+ &humid_st->common_attributes, val, val2);
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info humidity_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = &humidity_read_raw,
+ .write_raw = &humidity_write_raw,
+};
+
+/* Callback handler to send event after all samples are received and captured */
+static int humidity_proc_event(struct hid_sensor_hub_device *hsdev,
+ unsigned int usage_id, void *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct humidity_state *humid_st = iio_priv(indio_dev);
+
+ if (atomic_read(&humid_st->common_attributes.data_ready))
+ iio_push_to_buffers_with_timestamp(indio_dev,
+ &humid_st->humidity_data,
+ iio_get_time_ns(indio_dev));
+
+ return 0;
+}
+
+/* Capture samples in local storage */
+static int humidity_capture_sample(struct hid_sensor_hub_device *hsdev,
+ unsigned int usage_id, size_t raw_len,
+ char *raw_data, void *pdev)
+{
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct humidity_state *humid_st = iio_priv(indio_dev);
+
+ switch (usage_id) {
+ case HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY:
+ humid_st->humidity_data = *(s32 *)raw_data;
+
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+/* Parse report which is specific to an usage id*/
+static int humidity_parse_report(struct platform_device *pdev,
+ struct hid_sensor_hub_device *hsdev,
+ struct iio_chan_spec *channels,
+ unsigned int usage_id,
+ struct humidity_state *st)
+{
+ int ret;
+
+ ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
+ usage_id,
+ HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
+ &st->humidity_attr);
+ if (ret < 0)
+ return ret;
+
+ humidity_adjust_channel_bit_mask(channels, 0, st->humidity_attr.size);
+
+ st->scale_precision = hid_sensor_format_scale(
+ HID_USAGE_SENSOR_HUMIDITY,
+ &st->humidity_attr,
+ &st->scale_pre_decml,
+ &st->scale_post_decml);
+
+ /* Set Sensitivity field ids, when there is no individual modifier */
+ if (st->common_attributes.sensitivity.index < 0)
+ sensor_hub_input_get_attribute_info(hsdev,
+ HID_FEATURE_REPORT, usage_id,
+ HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
+ HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
+ &st->common_attributes.sensitivity);
+
+ return ret;
+}
+
+static struct hid_sensor_hub_callbacks humidity_callbacks = {
+ .send_event = &humidity_proc_event,
+ .capture_sample = &humidity_capture_sample,
+};
+
+/* Function to initialize the processing for usage id */
+static int hid_humidity_probe(struct platform_device *pdev)
+{
+ static const char *name = "humidity";
+ struct iio_dev *indio_dev;
+ struct humidity_state *humid_st;
+ struct iio_chan_spec *humid_chans;
+ struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*humid_st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ humid_st = iio_priv(indio_dev);
+ humid_st->common_attributes.hsdev = hsdev;
+ humid_st->common_attributes.pdev = pdev;
+
+ ret = hid_sensor_parse_common_attributes(hsdev,
+ HID_USAGE_SENSOR_HUMIDITY,
+ &humid_st->common_attributes);
+ if (ret)
+ return ret;
+
+ humid_chans = devm_kmemdup(&indio_dev->dev, humidity_channels,
+ sizeof(humidity_channels), GFP_KERNEL);
+ if (!humid_chans)
+ return -ENOMEM;
+
+ ret = humidity_parse_report(pdev, hsdev, humid_chans,
+ HID_USAGE_SENSOR_HUMIDITY, humid_st);
+ if (ret)
+ return ret;
+
+ indio_dev->channels = humid_chans;
+ indio_dev->num_channels = ARRAY_SIZE(humidity_channels);
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->info = &humidity_info;
+ indio_dev->name = name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
+ &iio_pollfunc_store_time, NULL, NULL);
+ if (ret)
+ return ret;
+
+ atomic_set(&humid_st->common_attributes.data_ready, 0);
+ ret = hid_sensor_setup_trigger(indio_dev, name,
+ &humid_st->common_attributes);
+ if (ret)
+ return ret;
+
+ platform_set_drvdata(pdev, indio_dev);
+
+ humidity_callbacks.pdev = pdev;
+ ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY,
+ &humidity_callbacks);
+ if (ret)
+ goto error_remove_trigger;
+
+ ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
+ if (ret)
+ goto error_remove_callback;
+
+ return ret;
+
+error_remove_callback:
+ sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
+error_remove_trigger:
+ hid_sensor_remove_trigger(&humid_st->common_attributes);
+ return ret;
+}
+
+/* Function to deinitialize the processing for usage id */
+static int hid_humidity_remove(struct platform_device *pdev)
+{
+ struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
+ struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+ struct humidity_state *humid_st = iio_priv(indio_dev);
+
+ sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
+ hid_sensor_remove_trigger(&humid_st->common_attributes);
+
+ return 0;
+}
+
+static const struct platform_device_id hid_humidity_ids[] = {
+ {
+ /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
+ .name = "HID-SENSOR-200032",
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, hid_humidity_ids);
+
+static struct platform_driver hid_humidity_platform_driver = {
+ .id_table = hid_humidity_ids,
+ .driver = {
+ .name = "humidity-sensor",
+ .pm = &hid_sensor_pm_ops,
+ },
+ .probe = hid_humidity_probe,
+ .remove = hid_humidity_remove,
+};
+module_platform_driver(hid_humidity_platform_driver);
+
+MODULE_DESCRIPTION("HID Environmental humidity sensor");
+MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
index 30c7dc4..719c928 100644
--- a/include/linux/hid-sensor-ids.h
+++ b/include/linux/hid-sensor-ids.h
@@ -45,6 +45,10 @@
#define HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE 0x200430
#define HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE 0x200431
+/* humidity */
+#define HID_USAGE_SENSOR_HUMIDITY 0x200032
+#define HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY 0x200433
+
/* Gyro 3D: (200076) */
#define HID_USAGE_SENSOR_GYRO_3D 0x200076
#define HID_USAGE_SENSOR_DATA_ANGL_VELOCITY 0x200456
--
1.9.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* RE: [PATCH] iio: hid: Add humidity sensor support
2017-03-15 8:21 ` Peter Meerwald-Stadler
@ 2017-03-16 1:55 ` Song, Hongyan
-1 siblings, 0 replies; 5+ messages in thread
From: Song, Hongyan @ 2017-03-16 1:55 UTC (permalink / raw)
To: Peter Meerwald-Stadler
Cc: linux-input-u79uwXL29TY76Z2rM5mHXA,
linux-iio-u79uwXL29TY76Z2rM5mHXA, jikos-DgEjT+Ai2ygdnm+yROfE0A,
jic23-DgEjT+Ai2ygdnm+yROfE0A, Pandruvada, Srinivas
Hi Peter,
Thanks for your comments, patch have been updated.
BR
Song Hongyan
-----Original Message-----
From: Peter Meerwald-Stadler [mailto:pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org]
Sent: Wednesday, March 15, 2017 4:22 PM
To: Song, Hongyan <hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; jikos-DgEjT+Ai2yhQFI55V6+gNQ@public.gmane.orgg; jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org; Pandruvada, Srinivas <srinivas.pandruvada-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH] iio: hid: Add humidity sensor support
> Environmental humidity sensor is a hid defined sensor, it shows raw
> humidity measurement of air.
comments below
> More information can be found in:
> http://www.usb.org/developers/hidpage/HUTRR39b.pdf
>
> According to IIO ABI definition, humidityrelative data output unit is
> milli percent. Add the unit convert from percent to milli percent.
>
> Signed-off-by: Song Hongyan <hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
> .../iio/common/hid-sensors/hid-sensor-attributes.c | 2 +
> drivers/iio/humidity/Kconfig | 14 +
> drivers/iio/humidity/Makefile | 3 +
> drivers/iio/humidity/hid-sensor-humidity.c | 314 +++++++++++++++++++++
> include/linux/hid-sensor-ids.h | 4 +
> 5 files changed, 337 insertions(+)
> create mode 100644 drivers/iio/humidity/hid-sensor-humidity.c
>
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index 7afdac42..4f280ae 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -62,6 +62,8 @@
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
> 1000000, 0},
> +
> + {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
> };
>
> static int pow_10(unsigned power)
> diff --git a/drivers/iio/humidity/Kconfig
> b/drivers/iio/humidity/Kconfig index 912477d..14b9ce4 100644
> --- a/drivers/iio/humidity/Kconfig
> +++ b/drivers/iio/humidity/Kconfig
> @@ -36,6 +36,20 @@ config HDC100X
> To compile this driver as a module, choose M here: the module
> will be called hdc100x.
>
> +config HID_SENSOR_HUMIDITY
> + tristate "HID Environmental humidity sensor"
> + depends on HID_SENSOR_HUB
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + select HID_SENSOR_IIO_COMMON
> + select HID_SENSOR_IIO_TRIGGER
> + help
> + Say yes here to build support for the HID SENSOR
> + humidity driver
> +
> + To compile this driver as a module, choose M here: the module
> + will be called hid-sensor-humidity.
> +
> config HTS221
> tristate "STMicroelectronics HTS221 sensor Driver"
> depends on (I2C || SPI)
> diff --git a/drivers/iio/humidity/Makefile
> b/drivers/iio/humidity/Makefile index a6850e4..be0dede 100644
> --- a/drivers/iio/humidity/Makefile
> +++ b/drivers/iio/humidity/Makefile
> @@ -5,6 +5,7 @@
> obj-$(CONFIG_AM2315) += am2315.o
> obj-$(CONFIG_DHT11) += dht11.o
> obj-$(CONFIG_HDC100X) += hdc100x.o
> +obj-$(CONFIG_HID_SENSOR_HUMIDITY) += hid-sensor-humidity.o
>
> hts221-y := hts221_core.o \
> hts221_buffer.o
> @@ -15,3 +16,5 @@ obj-$(CONFIG_HTS221_SPI) += hts221_spi.o
> obj-$(CONFIG_HTU21) += htu21.o
> obj-$(CONFIG_SI7005) += si7005.o
> obj-$(CONFIG_SI7020) += si7020.o
> +
> +ccflags-y += -I$(srctree)/drivers/iio/common/hid-sensors
> diff --git a/drivers/iio/humidity/hid-sensor-humidity.c
> b/drivers/iio/humidity/hid-sensor-humidity.c
> new file mode 100644
> index 0000000..bff4ceb
> --- /dev/null
> +++ b/drivers/iio/humidity/hid-sensor-humidity.c
> @@ -0,0 +1,314 @@
> +/*
> + * HID Sensors Driver
> + * Copyright (c) 2017, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or
> +modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but
> +WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
> +or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
> +License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License
> +along with
> + * this program.
> + */
> +#include <linux/device.h>
> +#include <linux/hid-sensor-hub.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/triggered_buffer.h> #include
> +<linux/iio/trigger_consumer.h> #include <linux/module.h> #include
> +<linux/platform_device.h>
> +
> +#include "hid-sensor-trigger.h"
> +
> +struct humidity_state {
we want a consistent prefix, i.e. hid_humidity_
> + struct hid_sensor_common common_attributes;
> + struct hid_sensor_hub_attribute_info humidity_attr;
> + s32 humidity_data;
> + int scale_pre_decml;
> + int scale_post_decml;
> + int scale_precision;
> + int value_offset;
> +};
> +
> +/* Channel definitions */
> +static const struct iio_chan_spec humidity_channels[] = {
> + {
> + .type = IIO_HUMIDITYRELATIVE,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE) |
> + BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> + BIT(IIO_CHAN_INFO_HYSTERESIS),
> + },
> + IIO_CHAN_SOFT_TIMESTAMP(3)
should be 1
> +};
> +
> +/* Adjust channel real bits based on report descriptor */ static void
> +humidity_adjust_channel_bit_mask(struct iio_chan_spec *channels,
> + int channel, int size)
> +{
> + channels[channel].scan_type.sign = 's';
> + /* Real storage bits will change based on the report desc. */
> + channels[channel].scan_type.realbits = size * 8;
> + /* Maximum size of a sample to capture is s32 */
> + channels[channel].scan_type.storagebits = sizeof(s32) * 8; }
> +
> +static int humidity_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type != IIO_HUMIDITYRELATIVE)
> + return -EINVAL;
> + hid_sensor_power_state(&humid_st->common_attributes, true);
> + *val = sensor_hub_input_attr_get_raw_value(
> + humid_st->common_attributes.hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + humid_st->humidity_attr.report_id,
> + SENSOR_HUB_SYNC);
> + hid_sensor_power_state(&humid_st->common_attributes, false);
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SCALE:
> + *val = humid_st->scale_pre_decml;
> + *val2 = humid_st->scale_post_decml;
> +
> + return humid_st->scale_precision;
> +
> + case IIO_CHAN_INFO_OFFSET:
> + *val = humid_st->value_offset;
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_read_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_read_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int humidity_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_write_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_write_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_info humidity_info = {
> + .driver_module = THIS_MODULE,
> + .read_raw = &humidity_read_raw,
> + .write_raw = &humidity_write_raw,
> +};
> +
> +/* Callback handler to send event after all samples are received and
> +captured */ static int humidity_proc_event(struct hid_sensor_hub_device *hsdev,
> + unsigned int usage_id, void *pdev) {
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + if (atomic_read(&humid_st->common_attributes.data_ready))
> + iio_push_to_buffers_with_timestamp(indio_dev,
> + &humid_st->humidity_data,
> + iio_get_time_ns(indio_dev));
> +
> + return 0;
> +}
> +
> +/* Capture samples in local storage */ static int
> +humidity_capture_sample(struct hid_sensor_hub_device *hsdev,
> + unsigned int usage_id, size_t raw_len,
> + char *raw_data, void *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + switch (usage_id) {
> + case HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY:
> + humid_st->humidity_data = *(s32 *)raw_data;
> +
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +/* Parse report which is specific to an usage id*/
space missing before */
> +static int humidity_parse_report(struct platform_device *pdev,
> + struct hid_sensor_hub_device *hsdev,
> + struct iio_chan_spec *channels,
> + unsigned int usage_id,
> + struct humidity_state *st)
> +{
> + int ret;
> +
> + ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
> + usage_id,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->humidity_attr);
> + if (ret < 0)
> + return ret;
> +
> + humidity_adjust_channel_bit_mask(channels, 0,
> +st->humidity_attr.size);
> +
> + st->scale_precision = hid_sensor_format_scale(
> + HID_USAGE_SENSOR_HUMIDITY,
> + &st->humidity_attr,
> + &st->scale_pre_decml,
> + &st->scale_post_decml);
> +
> + /* Set Sensitivity field ids, when there is no individual modifier */
> + if (st->common_attributes.sensitivity.index < 0)
> + sensor_hub_input_get_attribute_info(hsdev,
> + HID_FEATURE_REPORT, usage_id,
> + HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->common_attributes.sensitivity);
> +
> + return ret;
> +}
> +
> +static struct hid_sensor_hub_callbacks humidity_callbacks = {
> + .send_event = &humidity_proc_event,
> + .capture_sample = &humidity_capture_sample, };
> +
> +/* Function to initialize the processing for usage id */ static int
> +hid_humidity_probe(struct platform_device *pdev) {
> + static const char *name = "humidity";
most drivers use a #define and put it somewhere near the top of the code
> + struct iio_dev *indio_dev;
> + struct humidity_state *humid_st;
> + struct iio_chan_spec *humid_chans;
> + struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
> + int ret;
> +
> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*humid_st));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + humid_st = iio_priv(indio_dev);
> + humid_st->common_attributes.hsdev = hsdev;
> + humid_st->common_attributes.pdev = pdev;
> +
> + ret = hid_sensor_parse_common_attributes(hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + humid_chans = devm_kmemdup(&indio_dev->dev, humidity_channels,
> + sizeof(humidity_channels), GFP_KERNEL);
> + if (!humid_chans)
> + return -ENOMEM;
> +
> + ret = humidity_parse_report(pdev, hsdev, humid_chans,
> + HID_USAGE_SENSOR_HUMIDITY, humid_st);
> + if (ret)
> + return ret;
> +
> + indio_dev->channels = humid_chans;
> + indio_dev->num_channels = ARRAY_SIZE(humidity_channels);
> + indio_dev->dev.parent = &pdev->dev;
> + indio_dev->info = &humidity_info;
> + indio_dev->name = name;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
> + &iio_pollfunc_store_time, NULL, NULL);
> + if (ret)
> + return ret;
> +
> + atomic_set(&humid_st->common_attributes.data_ready, 0);
> + ret = hid_sensor_setup_trigger(indio_dev, name,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + platform_set_drvdata(pdev, indio_dev);
> +
> + humidity_callbacks.pdev = pdev;
> + ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY,
> + &humidity_callbacks);
> + if (ret)
> + goto error_remove_trigger;
> +
> + ret = devm_iio_device_register(indio_dev->dev.parent, indio_dev);
don't use devm_iio_device_register() if you need _remove()
> + if (ret)
> + goto error_remove_callback;
> +
> + return ret;
> +
> +error_remove_callback:
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> +error_remove_trigger:
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> + return ret;
> +}
> +
> +/* Function to deinitialize the processing for usage id */ static int
> +hid_humidity_remove(struct platform_device *pdev) {
> + struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct humidity_state *humid_st = iio_priv(indio_dev);
> +
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id hid_humidity_ids[] = {
> + {
> + /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
> + .name = "HID-SENSOR-200032",
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, hid_humidity_ids);
> +
> +static struct platform_driver hid_humidity_platform_driver = {
> + .id_table = hid_humidity_ids,
> + .driver = {
> + .name = "humidity-sensor",
> + .pm = &hid_sensor_pm_ops,
> + },
> + .probe = hid_humidity_probe,
> + .remove = hid_humidity_remove,
> +};
> +module_platform_driver(hid_humidity_platform_driver);
> +
> +MODULE_DESCRIPTION("HID Environmental humidity sensor");
> +MODULE_AUTHOR("Song Hongyan <hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/hid-sensor-ids.h
> b/include/linux/hid-sensor-ids.h index 30c7dc4..719c928 100644
> --- a/include/linux/hid-sensor-ids.h
> +++ b/include/linux/hid-sensor-ids.h
> @@ -45,6 +45,10 @@
> #define HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE 0x200430
> #define HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE 0x200431
>
> +/* humidity */
> +#define HID_USAGE_SENSOR_HUMIDITY 0x200032
> +#define HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY 0x200433
> +
> /* Gyro 3D: (200076) */
> #define HID_USAGE_SENSOR_GYRO_3D 0x200076
> #define HID_USAGE_SENSOR_DATA_ANGL_VELOCITY 0x200456
>
--
Peter Meerwald-Stadler
Mobile: +43 664 24 44 418
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: [PATCH] iio: hid: Add humidity sensor support
@ 2017-03-16 1:55 ` Song, Hongyan
0 siblings, 0 replies; 5+ messages in thread
From: Song, Hongyan @ 2017-03-16 1:55 UTC (permalink / raw)
To: Peter Meerwald-Stadler
Cc: linux-input, linux-iio, jikos, jic23, Pandruvada, Srinivas
Hi Peter,
Thanks for your comments, patch have been updated.
BR
Song Hongyan
-----Original Message-----
From: Peter Meerwald-Stadler [mailto:pmeerw@pmeerw.net]=20
Sent: Wednesday, March 15, 2017 4:22 PM
To: Song, Hongyan <hongyan.song@intel.com>
Cc: linux-input@vger.kernel.org; linux-iio@vger.kernel.org; jikos@kernel.or=
g; jic23@kernel.org; Pandruvada, Srinivas <srinivas.pandruvada@intel.com>
Subject: Re: [PATCH] iio: hid: Add humidity sensor support
> Environmental humidity sensor is a hid defined sensor, it shows raw=20
> humidity measurement of air.
comments below
=20
> More information can be found in:
> http://www.usb.org/developers/hidpage/HUTRR39b.pdf
>=20
> According to IIO ABI definition, humidityrelative data output unit is=20
> milli percent. Add the unit convert from percent to milli percent.
>=20
> Signed-off-by: Song Hongyan <hongyan.song@intel.com>
> ---
> .../iio/common/hid-sensors/hid-sensor-attributes.c | 2 +
> drivers/iio/humidity/Kconfig | 14 +
> drivers/iio/humidity/Makefile | 3 +
> drivers/iio/humidity/hid-sensor-humidity.c | 314 +++++++++++++++=
++++++
> include/linux/hid-sensor-ids.h | 4 +
> 5 files changed, 337 insertions(+)
> create mode 100644 drivers/iio/humidity/hid-sensor-humidity.c
>=20
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c=20
> b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index 7afdac42..4f280ae 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -62,6 +62,8 @@
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, 0, 1000000000, 0},
> {HID_USAGE_SENSOR_TIME_TIMESTAMP, HID_USAGE_SENSOR_UNITS_MILLISECOND,
> 1000000, 0},
> +
> + {HID_USAGE_SENSOR_HUMIDITY, 0, 1000, 0},
> };
> =20
> static int pow_10(unsigned power)
> diff --git a/drivers/iio/humidity/Kconfig=20
> b/drivers/iio/humidity/Kconfig index 912477d..14b9ce4 100644
> --- a/drivers/iio/humidity/Kconfig
> +++ b/drivers/iio/humidity/Kconfig
> @@ -36,6 +36,20 @@ config HDC100X
> To compile this driver as a module, choose M here: the module
> will be called hdc100x.
> =20
> +config HID_SENSOR_HUMIDITY
> + tristate "HID Environmental humidity sensor"
> + depends on HID_SENSOR_HUB
> + select IIO_BUFFER
> + select IIO_TRIGGERED_BUFFER
> + select HID_SENSOR_IIO_COMMON
> + select HID_SENSOR_IIO_TRIGGER
> + help
> + Say yes here to build support for the HID SENSOR
> + humidity driver
> +
> + To compile this driver as a module, choose M here: the module
> + will be called hid-sensor-humidity.
> +
> config HTS221
> tristate "STMicroelectronics HTS221 sensor Driver"
> depends on (I2C || SPI)
> diff --git a/drivers/iio/humidity/Makefile=20
> b/drivers/iio/humidity/Makefile index a6850e4..be0dede 100644
> --- a/drivers/iio/humidity/Makefile
> +++ b/drivers/iio/humidity/Makefile
> @@ -5,6 +5,7 @@
> obj-$(CONFIG_AM2315) +=3D am2315.o
> obj-$(CONFIG_DHT11) +=3D dht11.o
> obj-$(CONFIG_HDC100X) +=3D hdc100x.o
> +obj-$(CONFIG_HID_SENSOR_HUMIDITY) +=3D hid-sensor-humidity.o
> =20
> hts221-y :=3D hts221_core.o \
> hts221_buffer.o
> @@ -15,3 +16,5 @@ obj-$(CONFIG_HTS221_SPI) +=3D hts221_spi.o
> obj-$(CONFIG_HTU21) +=3D htu21.o
> obj-$(CONFIG_SI7005) +=3D si7005.o
> obj-$(CONFIG_SI7020) +=3D si7020.o
> +
> +ccflags-y +=3D -I$(srctree)/drivers/iio/common/hid-sensors
> diff --git a/drivers/iio/humidity/hid-sensor-humidity.c=20
> b/drivers/iio/humidity/hid-sensor-humidity.c
> new file mode 100644
> index 0000000..bff4ceb
> --- /dev/null
> +++ b/drivers/iio/humidity/hid-sensor-humidity.c
> @@ -0,0 +1,314 @@
> +/*
> + * HID Sensors Driver
> + * Copyright (c) 2017, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or=20
> +modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but=20
> +WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY=20
> +or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public=20
> +License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License=20
> +along with
> + * this program.
> + */
> +#include <linux/device.h>
> +#include <linux/hid-sensor-hub.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/triggered_buffer.h> #include=20
> +<linux/iio/trigger_consumer.h> #include <linux/module.h> #include=20
> +<linux/platform_device.h>
> +
> +#include "hid-sensor-trigger.h"
> +
> +struct humidity_state {
we want a consistent prefix, i.e. hid_humidity_
> + struct hid_sensor_common common_attributes;
> + struct hid_sensor_hub_attribute_info humidity_attr;
> + s32 humidity_data;
> + int scale_pre_decml;
> + int scale_post_decml;
> + int scale_precision;
> + int value_offset;
> +};
> +
> +/* Channel definitions */
> +static const struct iio_chan_spec humidity_channels[] =3D {
> + {
> + .type =3D IIO_HUMIDITYRELATIVE,
> + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW),
> + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_OFFSET) |
> + BIT(IIO_CHAN_INFO_SCALE) |
> + BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> + BIT(IIO_CHAN_INFO_HYSTERESIS),
> + },
> + IIO_CHAN_SOFT_TIMESTAMP(3)
should be 1
> +};
> +
> +/* Adjust channel real bits based on report descriptor */ static void=20
> +humidity_adjust_channel_bit_mask(struct iio_chan_spec *channels,
> + int channel, int size)
> +{
> + channels[channel].scan_type.sign =3D 's';
> + /* Real storage bits will change based on the report desc. */
> + channels[channel].scan_type.realbits =3D size * 8;
> + /* Maximum size of a sample to capture is s32 */
> + channels[channel].scan_type.storagebits =3D sizeof(s32) * 8; }
> +
> +static int humidity_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int *val, int *val2, long mask)
> +{
> + struct humidity_state *humid_st =3D iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + if (chan->type !=3D IIO_HUMIDITYRELATIVE)
> + return -EINVAL;
> + hid_sensor_power_state(&humid_st->common_attributes, true);
> + *val =3D sensor_hub_input_attr_get_raw_value(
> + humid_st->common_attributes.hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + humid_st->humidity_attr.report_id,
> + SENSOR_HUB_SYNC);
> + hid_sensor_power_state(&humid_st->common_attributes, false);
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SCALE:
> + *val =3D humid_st->scale_pre_decml;
> + *val2 =3D humid_st->scale_post_decml;
> +
> + return humid_st->scale_precision;
> +
> + case IIO_CHAN_INFO_OFFSET:
> + *val =3D humid_st->value_offset;
> +
> + return IIO_VAL_INT;
> +
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_read_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_read_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int humidity_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct humidity_state *humid_st =3D iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + return hid_sensor_write_samp_freq_value(
> + &humid_st->common_attributes, val, val2);
> +
> + case IIO_CHAN_INFO_HYSTERESIS:
> + return hid_sensor_write_raw_hyst_value(
> + &humid_st->common_attributes, val, val2);
> +
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_info humidity_info =3D {
> + .driver_module =3D THIS_MODULE,
> + .read_raw =3D &humidity_read_raw,
> + .write_raw =3D &humidity_write_raw,
> +};
> +
> +/* Callback handler to send event after all samples are received and=20
> +captured */ static int humidity_proc_event(struct hid_sensor_hub_device =
*hsdev,
> + unsigned int usage_id, void *pdev) {
> + struct iio_dev *indio_dev =3D platform_get_drvdata(pdev);
> + struct humidity_state *humid_st =3D iio_priv(indio_dev);
> +
> + if (atomic_read(&humid_st->common_attributes.data_ready))
> + iio_push_to_buffers_with_timestamp(indio_dev,
> + &humid_st->humidity_data,
> + iio_get_time_ns(indio_dev));
> +
> + return 0;
> +}
> +
> +/* Capture samples in local storage */ static int=20
> +humidity_capture_sample(struct hid_sensor_hub_device *hsdev,
> + unsigned int usage_id, size_t raw_len,
> + char *raw_data, void *pdev)
> +{
> + struct iio_dev *indio_dev =3D platform_get_drvdata(pdev);
> + struct humidity_state *humid_st =3D iio_priv(indio_dev);
> +
> + switch (usage_id) {
> + case HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY:
> + humid_st->humidity_data =3D *(s32 *)raw_data;
> +
> + return 0;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +/* Parse report which is specific to an usage id*/
space missing before */
> +static int humidity_parse_report(struct platform_device *pdev,
> + struct hid_sensor_hub_device *hsdev,
> + struct iio_chan_spec *channels,
> + unsigned int usage_id,
> + struct humidity_state *st)
> +{
> + int ret;
> +
> + ret =3D sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
> + usage_id,
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->humidity_attr);
> + if (ret < 0)
> + return ret;
> +
> + humidity_adjust_channel_bit_mask(channels, 0,=20
> +st->humidity_attr.size);
> +
> + st->scale_precision =3D hid_sensor_format_scale(
> + HID_USAGE_SENSOR_HUMIDITY,
> + &st->humidity_attr,
> + &st->scale_pre_decml,
> + &st->scale_post_decml);
> +
> + /* Set Sensitivity field ids, when there is no individual modifier */
> + if (st->common_attributes.sensitivity.index < 0)
> + sensor_hub_input_get_attribute_info(hsdev,
> + HID_FEATURE_REPORT, usage_id,
> + HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
> + HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
> + &st->common_attributes.sensitivity);
> +
> + return ret;
> +}
> +
> +static struct hid_sensor_hub_callbacks humidity_callbacks =3D {
> + .send_event =3D &humidity_proc_event,
> + .capture_sample =3D &humidity_capture_sample, };
> +
> +/* Function to initialize the processing for usage id */ static int=20
> +hid_humidity_probe(struct platform_device *pdev) {
> + static const char *name =3D "humidity";
most drivers use a #define and put it somewhere near the top of the code
> + struct iio_dev *indio_dev;
> + struct humidity_state *humid_st;
> + struct iio_chan_spec *humid_chans;
> + struct hid_sensor_hub_device *hsdev =3D dev_get_platdata(&pdev->dev);
> + int ret;
> +
> + indio_dev =3D devm_iio_device_alloc(&pdev->dev, sizeof(*humid_st));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + humid_st =3D iio_priv(indio_dev);
> + humid_st->common_attributes.hsdev =3D hsdev;
> + humid_st->common_attributes.pdev =3D pdev;
> +
> + ret =3D hid_sensor_parse_common_attributes(hsdev,
> + HID_USAGE_SENSOR_HUMIDITY,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + humid_chans =3D devm_kmemdup(&indio_dev->dev, humidity_channels,
> + sizeof(humidity_channels), GFP_KERNEL);
> + if (!humid_chans)
> + return -ENOMEM;
> +
> + ret =3D humidity_parse_report(pdev, hsdev, humid_chans,
> + HID_USAGE_SENSOR_HUMIDITY, humid_st);
> + if (ret)
> + return ret;
> +
> + indio_dev->channels =3D humid_chans;
> + indio_dev->num_channels =3D ARRAY_SIZE(humidity_channels);
> + indio_dev->dev.parent =3D &pdev->dev;
> + indio_dev->info =3D &humidity_info;
> + indio_dev->name =3D name;
> + indio_dev->modes =3D INDIO_DIRECT_MODE;
> +
> + ret =3D devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
> + &iio_pollfunc_store_time, NULL, NULL);
> + if (ret)
> + return ret;
> +
> + atomic_set(&humid_st->common_attributes.data_ready, 0);
> + ret =3D hid_sensor_setup_trigger(indio_dev, name,
> + &humid_st->common_attributes);
> + if (ret)
> + return ret;
> +
> + platform_set_drvdata(pdev, indio_dev);
> +
> + humidity_callbacks.pdev =3D pdev;
> + ret =3D sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY,
> + &humidity_callbacks);
> + if (ret)
> + goto error_remove_trigger;
> +
> + ret =3D devm_iio_device_register(indio_dev->dev.parent, indio_dev);
don't use devm_iio_device_register() if you need _remove()
> + if (ret)
> + goto error_remove_callback;
> +
> + return ret;
> +
> +error_remove_callback:
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> +error_remove_trigger:
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> + return ret;
> +}
> +
> +/* Function to deinitialize the processing for usage id */ static int=20
> +hid_humidity_remove(struct platform_device *pdev) {
> + struct hid_sensor_hub_device *hsdev =3D dev_get_platdata(&pdev->dev);
> + struct iio_dev *indio_dev =3D platform_get_drvdata(pdev);
> + struct humidity_state *humid_st =3D iio_priv(indio_dev);
> +
> + sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
> + hid_sensor_remove_trigger(&humid_st->common_attributes);
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id hid_humidity_ids[] =3D {
> + {
> + /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
> + .name =3D "HID-SENSOR-200032",
> + },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, hid_humidity_ids);
> +
> +static struct platform_driver hid_humidity_platform_driver =3D {
> + .id_table =3D hid_humidity_ids,
> + .driver =3D {
> + .name =3D "humidity-sensor",
> + .pm =3D &hid_sensor_pm_ops,
> + },
> + .probe =3D hid_humidity_probe,
> + .remove =3D hid_humidity_remove,
> +};
> +module_platform_driver(hid_humidity_platform_driver);
> +
> +MODULE_DESCRIPTION("HID Environmental humidity sensor");=20
> +MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");=20
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/hid-sensor-ids.h=20
> b/include/linux/hid-sensor-ids.h index 30c7dc4..719c928 100644
> --- a/include/linux/hid-sensor-ids.h
> +++ b/include/linux/hid-sensor-ids.h
> @@ -45,6 +45,10 @@
> #define HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE 0x200430
> #define HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE 0x200431
> =20
> +/* humidity */
> +#define HID_USAGE_SENSOR_HUMIDITY 0x200032
> +#define HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY 0x200433
> +
> /* Gyro 3D: (200076) */
> #define HID_USAGE_SENSOR_GYRO_3D 0x200076
> #define HID_USAGE_SENSOR_DATA_ANGL_VELOCITY 0x200456
>=20
--=20
Peter Meerwald-Stadler
Mobile: +43 664 24 44 418
^ permalink raw reply [flat|nested] 5+ messages in thread
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-- links below jump to the message on this page --
2017-03-15 11:15 [PATCH] iio: hid: Add humidity sensor support Song Hongyan
[not found] ` <1489576515-33346-1-git-send-email-hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-03-15 8:21 ` Peter Meerwald-Stadler
2017-03-15 8:21 ` Peter Meerwald-Stadler
[not found] ` <alpine.DEB.2.20.1703150859290.15322-M0QeDd4q1oXQbIPoIc8EuQ@public.gmane.org>
2017-03-16 1:55 ` Song, Hongyan
2017-03-16 1:55 ` Song, Hongyan
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