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SubjectRe: [PATCH 1/3] iio: Add relative sensitivity support
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,

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