Currently, hid sensor als are using the relative hysteresis.
This patch series add the relative hysteresis for hid sensors.
Ye Xiang (3):
iio: Add relative sensitivity support
iio: hid-sensor-als: Add relative hysteresis support
iio: Add relative hysteresis in ABI documentation
Documentation/ABI/testing/sysfs-bus-iio | 8 ++
.../hid-sensors/hid-sensor-attributes.c | 75 ++++++++++++++++++-
drivers/iio/industrialio-core.c | 1 +
drivers/iio/light/hid-sensor-als.c | 14 +++-
include/linux/hid-sensor-hub.h | 5 ++
include/linux/hid-sensor-ids.h | 1 +
include/linux/iio/types.h | 1 +
7 files changed, 99 insertions(+), 6 deletions(-)
--
2.17.1
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 <[email protected]>
---
.../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 {
+ 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,
--
2.17.1
Hid sensor als uses relative hysteresis, this patch adds the support.
Signed-off-by: Ye Xiang <[email protected]>
---
drivers/iio/light/hid-sensor-als.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
index afcdb424bfb8..85c8a05b73cb 100644
--- a/drivers/iio/light/hid-sensor-als.c
+++ b/drivers/iio/light/hid-sensor-als.c
@@ -54,7 +54,8 @@ static const struct iio_chan_spec als_channels[] = {
.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),
+ BIT(IIO_CHAN_INFO_HYSTERESIS) |
+ BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
.scan_index = CHANNEL_SCAN_INDEX_INTENSITY,
},
{
@@ -63,7 +64,8 @@ static const struct iio_chan_spec als_channels[] = {
.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),
+ BIT(IIO_CHAN_INFO_HYSTERESIS) |
+ BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
.scan_index = CHANNEL_SCAN_INDEX_ILLUM,
},
IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
@@ -141,6 +143,10 @@ static int als_read_raw(struct iio_dev *indio_dev,
ret_type = hid_sensor_read_raw_hyst_value(
&als_state->common_attributes, val, val2);
break;
+ case IIO_CHAN_INFO_HYSTERESIS_RELATIVE:
+ ret_type = hid_sensor_read_raw_hyst_rel_value(
+ &als_state->common_attributes, val, val2);
+ break;
default:
ret_type = -EINVAL;
break;
@@ -168,6 +174,10 @@ static int als_write_raw(struct iio_dev *indio_dev,
ret = hid_sensor_write_raw_hyst_value(
&als_state->common_attributes, val, val2);
break;
+ case IIO_CHAN_INFO_HYSTERESIS_RELATIVE:
+ ret = hid_sensor_write_raw_hyst_rel_value(
+ &als_state->common_attributes, val, val2);
+ break;
default:
ret = -EINVAL;
}
--
2.17.1
Add relative hysteresis in ABI documentation.
Signed-off-by: Ye Xiang <[email protected]>
---
Documentation/ABI/testing/sysfs-bus-iio | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index d957f5da5c04..1c51db7eb8ef 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -1823,3 +1823,11 @@ Description:
hinge, keyboard, screen. It means the three channels
each correspond respectively to hinge angle, keyboard angle,
and screen angle.
+
+What: /sys/bus/iio/devices/iio:deviceX/in_Y_hysteresis_relative
+KernelVersion: 5.12
+Contact: [email protected]
+Description:
+ Specify the percent relative to the current sensor channel
+ Y absolute value that a data field should change before an event
+ is generated. Units are a percentage of the prior reading.
--
2.17.1
On Mon, 1 Feb 2021 15:43:58 +0800
Ye Xiang <[email protected]> wrote:
> Add relative hysteresis in ABI documentation.
>
> Signed-off-by: Ye Xiang <[email protected]>
> ---
> Documentation/ABI/testing/sysfs-bus-iio | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index d957f5da5c04..1c51db7eb8ef 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1823,3 +1823,11 @@ Description:
> hinge, keyboard, screen. It means the three channels
> each correspond respectively to hinge angle, keyboard angle,
> and screen angle.
> +
> +What: /sys/bus/iio/devices/iio:deviceX/in_Y_hysteresis_relative
I'm rather undecided on whether a generic catch all for sensor types here makes
sense. Given we aren't currently applying it to too many devices, I think
I'd prefer we documented this for the particular entries we are adding as
that is the approach that we've taken for the majority of the rest of the
main ABI doc. Note that tidying this doc up has been something I've wanted
to look at doing for a while, so it's possible I'll revisit this decision
at that time.
Otherwise, this looks good.
Thanks,
Jonathan
> +KernelVersion: 5.12
> +Contact: [email protected]
> +Description:
> + Specify the percent relative to the current sensor channel
> + Y absolute value that a data field should change before an event
> + is generated. Units are a percentage of the prior reading.
On Mon, 1 Feb 2021 15:43:56 +0800
Ye Xiang <[email protected]> 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 <[email protected]>
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,
On Mon, 1 Feb 2021 15:43:57 +0800
Ye Xiang <[email protected]> wrote:
> Hid sensor als uses relative hysteresis, this patch adds the support.
>
> Signed-off-by: Ye Xiang <[email protected]>
Looks good to me.
Jonathan
> ---
> drivers/iio/light/hid-sensor-als.c | 14 ++++++++++++--
> 1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
> index afcdb424bfb8..85c8a05b73cb 100644
> --- a/drivers/iio/light/hid-sensor-als.c
> +++ b/drivers/iio/light/hid-sensor-als.c
> @@ -54,7 +54,8 @@ static const struct iio_chan_spec als_channels[] = {
> .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),
> + BIT(IIO_CHAN_INFO_HYSTERESIS) |
> + BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
> .scan_index = CHANNEL_SCAN_INDEX_INTENSITY,
> },
> {
> @@ -63,7 +64,8 @@ static const struct iio_chan_spec als_channels[] = {
> .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),
> + BIT(IIO_CHAN_INFO_HYSTERESIS) |
> + BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
> .scan_index = CHANNEL_SCAN_INDEX_ILLUM,
> },
> IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
> @@ -141,6 +143,10 @@ static int als_read_raw(struct iio_dev *indio_dev,
> ret_type = hid_sensor_read_raw_hyst_value(
> &als_state->common_attributes, val, val2);
> break;
> + case IIO_CHAN_INFO_HYSTERESIS_RELATIVE:
> + ret_type = hid_sensor_read_raw_hyst_rel_value(
> + &als_state->common_attributes, val, val2);
> + break;
> default:
> ret_type = -EINVAL;
> break;
> @@ -168,6 +174,10 @@ static int als_write_raw(struct iio_dev *indio_dev,
> ret = hid_sensor_write_raw_hyst_value(
> &als_state->common_attributes, val, val2);
> break;
> + case IIO_CHAN_INFO_HYSTERESIS_RELATIVE:
> + ret = hid_sensor_write_raw_hyst_rel_value(
> + &als_state->common_attributes, val, val2);
> + break;
> default:
> ret = -EINVAL;
> }