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Date:   Sat, 6 Feb 2021 16:51:46 +0000
From:   Jonathan Cameron <jic23@kernel.org>
To:     Ye Xiang <xiang.ye@intel.com>
Cc:     jikos@kernel.org, srinivas.pandruvada@linux.intel.com,
        linux-input@vger.kernel.org, linux-iio@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] iio: Add relative sensitivity support
Message-ID: <20210206165146.5502332a@archlinux>
In-Reply-To: <20210201074358.18435-2-xiang.ye@intel.com>
References: <20210201074358.18435-1-xiang.ye@intel.com>
        <20210201074358.18435-2-xiang.ye@intel.com>
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On Mon,  1 Feb 2021 15:43:56 +0800
Ye Xiang <xiang.ye@intel.com> wrote:

> Some hid sensors may use relative sensitivity such as als sensor.
> This patch adds relative sensitivity checking for all hid sensors.
> 
> Signed-off-by: Ye Xiang <xiang.ye@intel.com>

One trivial formatting thing inline + ideally I'd like an ack from Jiri for the
HID related header changes.

Otherwise look good to me!

Jonathan

> ---
>  .../hid-sensors/hid-sensor-attributes.c       | 75 ++++++++++++++++++-
>  drivers/iio/industrialio-core.c               |  1 +
>  include/linux/hid-sensor-hub.h                |  5 ++
>  include/linux/hid-sensor-ids.h                |  1 +
>  include/linux/iio/types.h                     |  1 +
>  5 files changed, 79 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index d349ace2e33f..7a555262ff9a 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -263,6 +263,30 @@ int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
>  }
>  EXPORT_SYMBOL(hid_sensor_read_raw_hyst_value);
>  
> +int hid_sensor_read_raw_hyst_rel_value(struct hid_sensor_common *st, int *val1,
> +				       int *val2)
> +{
> +	s32 value;
> +	int ret;
> +
> +	ret = sensor_hub_get_feature(st->hsdev,
> +				     st->sensitivity_rel.report_id,
> +				     st->sensitivity_rel.index, sizeof(value),
> +				     &value);
> +	if (ret < 0 || value < 0) {
> +		*val1 = *val2 = 0;
> +		return -EINVAL;
> +	} else {

This isn't really an 'else' path given we've returned for the error path
above.

hence I'd just drop the indentation of this.  That is

	if (ret < 0 || value < 0) {
...
	}

	convert_from_vtf...


> +		convert_from_vtf_format(value, st->sensitivity_rel.size,
> +					st->sensitivity_rel.unit_expo,
> +					val1, val2);
> +	}
> +
> +	return IIO_VAL_INT_PLUS_MICRO;
> +}
> +EXPORT_SYMBOL(hid_sensor_read_raw_hyst_rel_value);
> +
> +
>  int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
>  					int val1, int val2)
>  {
> @@ -294,6 +318,37 @@ int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
>  }
>  EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
>  
> +int hid_sensor_write_raw_hyst_rel_value(struct hid_sensor_common *st,
> +					int val1, int val2)
> +{
> +	s32 value;
> +	int ret;
> +
> +	if (val1 < 0 || val2 < 0)
> +		return -EINVAL;
> +
> +	value = convert_to_vtf_format(st->sensitivity_rel.size,
> +				st->sensitivity_rel.unit_expo,
> +				val1, val2);
> +	ret = sensor_hub_set_feature(st->hsdev, st->sensitivity_rel.report_id,
> +				     st->sensitivity_rel.index, sizeof(value),
> +				     &value);
> +	if (ret < 0 || value < 0)
> +		return -EINVAL;
> +
> +	ret = sensor_hub_get_feature(st->hsdev,
> +				     st->sensitivity_rel.report_id,
> +				     st->sensitivity_rel.index, sizeof(value),
> +				     &value);
> +	if (ret < 0 || value < 0)
> +		return -EINVAL;
> +
> +	st->raw_hystersis = value;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(hid_sensor_write_raw_hyst_rel_value);
> +
>  /*
>   * This fuction applies the unit exponent to the scale.
>   * For example:
> @@ -478,16 +533,28 @@ int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
>  			HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
>  			 &st->sensitivity);
>  
> +	sensor_hub_input_get_attribute_info(hsdev,
> +			HID_FEATURE_REPORT, usage_id,
> +			HID_USAGE_SENSOR_PROP_SENSITIVITY_REL_PCT,
> +			&st->sensitivity_rel);
>  	/*
>  	 * Set Sensitivity field ids, when there is no individual modifier, will
> -	 * check absolute sensitivity of data field
> +	 * check absolute sensitivity and relative sensitivity of data field
>  	 */
> -	for (i = 0; i < sensitivity_addresses_len && st->sensitivity.index < 0; i++) {
> -		sensor_hub_input_get_attribute_info(hsdev,
> -				HID_FEATURE_REPORT, usage_id,
> +	for (i = 0; i < sensitivity_addresses_len; i++) {
> +		if (st->sensitivity.index < 0)
> +			sensor_hub_input_get_attribute_info(
> +				hsdev, HID_FEATURE_REPORT, usage_id,
>  				HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
>  					sensitivity_addresses[i],
>  				&st->sensitivity);
> +
> +		if (st->sensitivity_rel.index < 0)
> +			sensor_hub_input_get_attribute_info(
> +				hsdev, HID_FEATURE_REPORT, usage_id,
> +				HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_REL_PCT |
> +					sensitivity_addresses[i],
> +				&st->sensitivity_rel);
>  	}
>  
>  	st->raw_hystersis = -1;
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 7db761afa578..3da8fcec3c16 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -157,6 +157,7 @@ static const char * const iio_chan_info_postfix[] = {
>  	[IIO_CHAN_INFO_PHASE] = "phase",
>  	[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
>  	[IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
> +	[IIO_CHAN_INFO_HYSTERESIS_RELATIVE] = "hysteresis_relative",
>  	[IIO_CHAN_INFO_INT_TIME] = "integration_time",
>  	[IIO_CHAN_INFO_ENABLE] = "en",
>  	[IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
> diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
> index 8b2599348554..5e7bc309172e 100644
> --- a/include/linux/hid-sensor-hub.h
> +++ b/include/linux/hid-sensor-hub.h
> @@ -230,6 +230,7 @@ struct hid_sensor_common {
>  	struct hid_sensor_hub_attribute_info report_state;
>  	struct hid_sensor_hub_attribute_info power_state;
>  	struct hid_sensor_hub_attribute_info sensitivity;
> +	struct hid_sensor_hub_attribute_info sensitivity_rel;
>  	struct hid_sensor_hub_attribute_info report_latency;
>  	struct work_struct work;
>  };
> @@ -252,8 +253,12 @@ int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
>  					u32 sensitivity_addresses_len);
>  int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
>  					int val1, int val2);
> +int hid_sensor_write_raw_hyst_rel_value(struct hid_sensor_common *st, int val1,
> +					int val2);
>  int hid_sensor_read_raw_hyst_value(struct hid_sensor_common *st,
>  					int *val1, int *val2);
> +int hid_sensor_read_raw_hyst_rel_value(struct hid_sensor_common *st,
> +				       int *val1, int *val2);
>  int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
>  					int val1, int val2);
>  int hid_sensor_read_samp_freq_value(struct hid_sensor_common *st,
> diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h
> index 3bbdbccc5805..ac631159403a 100644
> --- a/include/linux/hid-sensor-ids.h
> +++ b/include/linux/hid-sensor-ids.h
> @@ -149,6 +149,7 @@
>  /* Per data field properties */
>  #define HID_USAGE_SENSOR_DATA_MOD_NONE					0x00
>  #define HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS		0x1000
> +#define HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_REL_PCT            0xE000
>  
>  /* Power state enumerations */
>  #define HID_USAGE_SENSOR_PROP_POWER_STATE_UNDEFINED_ENUM	0x200850
> diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
> index 1e3ed6f55bca..5aa7f66d4345 100644
> --- a/include/linux/iio/types.h
> +++ b/include/linux/iio/types.h
> @@ -50,6 +50,7 @@ enum iio_chan_info_enum {
>  	IIO_CHAN_INFO_PHASE,
>  	IIO_CHAN_INFO_HARDWAREGAIN,
>  	IIO_CHAN_INFO_HYSTERESIS,
> +	IIO_CHAN_INFO_HYSTERESIS_RELATIVE,
>  	IIO_CHAN_INFO_INT_TIME,
>  	IIO_CHAN_INFO_ENABLE,
>  	IIO_CHAN_INFO_CALIBHEIGHT,