[PATCH] iio: hid-sensor: Store restore poll and hysteresis on S3

[PATCH] iio: hid-sensor: Store restore poll and hysteresis on S3

[Srinivas Pandruvada]

This change undo the change done by 'commit 3bec24747446
("iio: hid-sensor-trigger: Change get poll value function order to avoid
sensor properties losing after resume from S3")' as this breaks some
USB/i2c sensor hubs.

Instead of relying on HW for restoring poll and hysteresis, driver stores
and restores on resume (S3). In this way user space modified settings are
not lost for any kind of sensor hub behavior.

In this change, whenever user space modifies sampling frequency or
hysteresis driver will get the feature value from the hub and store in the
per device hid_sensor_common data structure. On resume callback from S3,
system will set the feature to sensor hub, if user space ever modified the
feature value.

Fixes: 3bec24747446 ("iio: hid-sensor-trigger: Change get poll value function order to avoid sensor properties losing after resume from S3")
Reported-by: Ritesh Raj Sarraf <rrs@researchut.com>
Tested-by: Ritesh Raj Sarraf <rrs@researchut.com>
Tested-by: Song, Hongyan <hongyan.song@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 .../iio/common/hid-sensors/hid-sensor-attributes.c | 26 ++++++++++++++++++++--
 .../iio/common/hid-sensors/hid-sensor-trigger.c    | 20 ++++++++++++++---
 include/linux/hid-sensor-hub.h                     |  2 ++
 3 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
index 7afdac42..efd3151 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
@@ -221,7 +221,15 @@ int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
 	if (ret < 0 || value < 0)
 		ret = -EINVAL;
 
-	return ret;
+	ret = sensor_hub_get_feature(st->hsdev,
+				     st->poll.report_id,
+				     st->poll.index, sizeof(value), &value);
+	if (ret < 0 || value < 0)
+		return -EINVAL;
+
+	st->poll_interval = value;
+
+	return 0;
 }
 EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
 
@@ -266,7 +274,16 @@ int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
 	if (ret < 0 || value < 0)
 		ret = -EINVAL;
 
-	return ret;
+	ret = sensor_hub_get_feature(st->hsdev,
+				     st->sensitivity.report_id,
+				     st->sensitivity.index, sizeof(value),
+				     &value);
+	if (ret < 0 || value < 0)
+		return -EINVAL;
+
+	st->raw_hystersis = value;
+
+	return 0;
 }
 EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
 
@@ -369,6 +386,9 @@ int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
 	/* Default unit of measure is milliseconds */
 	if (st->poll.units == 0)
 		st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
+
+	st->poll_interval = -1;
+
 	return 0;
 
 }
@@ -397,6 +417,8 @@ int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
 			HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
 			 &st->sensitivity);
 
+	st->raw_hystersis = -1;
+
 	sensor_hub_input_get_attribute_info(hsdev,
 					    HID_INPUT_REPORT, usage_id,
 					    HID_USAGE_SENSOR_TIME_TIMESTAMP,
diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
index ecf592d..6082934 100644
--- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
+++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
@@ -51,6 +51,8 @@ static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
 			st->report_state.report_id,
 			st->report_state.index,
 			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
+
+		poll_value = hid_sensor_read_poll_value(st);
 	} else {
 		int val;
 
@@ -87,9 +89,7 @@ static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
 	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
 			       st->power_state.index,
 			       sizeof(state_val), &state_val);
-	if (state)
-		poll_value = hid_sensor_read_poll_value(st);
-	if (poll_value > 0)
+	if (state && poll_value)
 		msleep_interruptible(poll_value * 2);
 
 	return 0;
@@ -127,6 +127,20 @@ static void hid_sensor_set_power_work(struct work_struct *work)
 	struct hid_sensor_common *attrb = container_of(work,
 						       struct hid_sensor_common,
 						       work);
+
+	if (attrb->poll_interval >= 0)
+		sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
+				       attrb->poll.index,
+				       sizeof(attrb->poll_interval),
+				       &attrb->poll_interval);
+
+	if (attrb->raw_hystersis >= 0)
+		sensor_hub_set_feature(attrb->hsdev,
+				       attrb->sensitivity.report_id,
+				       attrb->sensitivity.index,
+				       sizeof(attrb->raw_hystersis),
+				       &attrb->raw_hystersis);
+
 	_hid_sensor_power_state(attrb, true);
 }
 
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index 7ef111d..f32d7c3 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h
@@ -231,6 +231,8 @@ struct hid_sensor_common {
 	unsigned usage_id;
 	atomic_t data_ready;
 	atomic_t user_requested_state;
+	int poll_interval;
+	int raw_hystersis;
 	struct iio_trigger *trigger;
 	int timestamp_ns_scale;
 	struct hid_sensor_hub_attribute_info poll;
-- 
2.9.3

Re: [PATCH] iio: hid-sensor: Store restore poll and hysteresis on S3

[Jonathan Cameron]

On 08/04/17 01:13, Srinivas Pandruvada wrote:
> This change undo the change done by 'commit 3bec24747446
> ("iio: hid-sensor-trigger: Change get poll value function order to avoid
> sensor properties losing after resume from S3")' as this breaks some
> USB/i2c sensor hubs.
> 
> Instead of relying on HW for restoring poll and hysteresis, driver stores
> and restores on resume (S3). In this way user space modified settings are
> not lost for any kind of sensor hub behavior.
> 
> In this change, whenever user space modifies sampling frequency or
> hysteresis driver will get the feature value from the hub and store in the
> per device hid_sensor_common data structure. On resume callback from S3,
> system will set the feature to sensor hub, if user space ever modified the
> feature value.
> 
> Fixes: 3bec24747446 ("iio: hid-sensor-trigger: Change get poll value function order to avoid sensor properties losing after resume from S3")
> Reported-by: Ritesh Raj Sarraf <rrs@researchut.com>
> Tested-by: Ritesh Raj Sarraf <rrs@researchut.com>
> Tested-by: Song, Hongyan <hongyan.song@intel.com>
> Cc: stable@vger.kernel.org
> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Applied. Hoping this is the final fix on these related issues!

Jonathan
> ---
>  .../iio/common/hid-sensors/hid-sensor-attributes.c | 26 ++++++++++++++++++++--
>  .../iio/common/hid-sensors/hid-sensor-trigger.c    | 20 ++++++++++++++---
>  include/linux/hid-sensor-hub.h                     |  2 ++
>  3 files changed, 43 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index 7afdac42..efd3151 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -221,7 +221,15 @@ int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
>  	if (ret < 0 || value < 0)
>  		ret = -EINVAL;
>  
> -	return ret;
> +	ret = sensor_hub_get_feature(st->hsdev,
> +				     st->poll.report_id,
> +				     st->poll.index, sizeof(value), &value);
> +	if (ret < 0 || value < 0)
> +		return -EINVAL;
> +
> +	st->poll_interval = value;
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
>  
> @@ -266,7 +274,16 @@ int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
>  	if (ret < 0 || value < 0)
>  		ret = -EINVAL;
>  
> -	return ret;
> +	ret = sensor_hub_get_feature(st->hsdev,
> +				     st->sensitivity.report_id,
> +				     st->sensitivity.index, sizeof(value),
> +				     &value);
> +	if (ret < 0 || value < 0)
> +		return -EINVAL;
> +
> +	st->raw_hystersis = value;
> +
> +	return 0;
>  }
>  EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
>  
> @@ -369,6 +386,9 @@ int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
>  	/* Default unit of measure is milliseconds */
>  	if (st->poll.units == 0)
>  		st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
> +
> +	st->poll_interval = -1;
> +
>  	return 0;
>  
>  }
> @@ -397,6 +417,8 @@ int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
>  			HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
>  			 &st->sensitivity);
>  
> +	st->raw_hystersis = -1;
> +
>  	sensor_hub_input_get_attribute_info(hsdev,
>  					    HID_INPUT_REPORT, usage_id,
>  					    HID_USAGE_SENSOR_TIME_TIMESTAMP,
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
> index ecf592d..6082934 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
> @@ -51,6 +51,8 @@ static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
>  			st->report_state.report_id,
>  			st->report_state.index,
>  			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
> +
> +		poll_value = hid_sensor_read_poll_value(st);
>  	} else {
>  		int val;
>  
> @@ -87,9 +89,7 @@ static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
>  	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
>  			       st->power_state.index,
>  			       sizeof(state_val), &state_val);
> -	if (state)
> -		poll_value = hid_sensor_read_poll_value(st);
> -	if (poll_value > 0)
> +	if (state && poll_value)
>  		msleep_interruptible(poll_value * 2);
>  
>  	return 0;
> @@ -127,6 +127,20 @@ static void hid_sensor_set_power_work(struct work_struct *work)
>  	struct hid_sensor_common *attrb = container_of(work,
>  						       struct hid_sensor_common,
>  						       work);
> +
> +	if (attrb->poll_interval >= 0)
> +		sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
> +				       attrb->poll.index,
> +				       sizeof(attrb->poll_interval),
> +				       &attrb->poll_interval);
> +
> +	if (attrb->raw_hystersis >= 0)
> +		sensor_hub_set_feature(attrb->hsdev,
> +				       attrb->sensitivity.report_id,
> +				       attrb->sensitivity.index,
> +				       sizeof(attrb->raw_hystersis),
> +				       &attrb->raw_hystersis);
> +
>  	_hid_sensor_power_state(attrb, true);
>  }
>  
> diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
> index 7ef111d..f32d7c3 100644
> --- a/include/linux/hid-sensor-hub.h
> +++ b/include/linux/hid-sensor-hub.h
> @@ -231,6 +231,8 @@ struct hid_sensor_common {
>  	unsigned usage_id;
>  	atomic_t data_ready;
>  	atomic_t user_requested_state;
> +	int poll_interval;
> +	int raw_hystersis;
>  	struct iio_trigger *trigger;
>  	int timestamp_ns_scale;
>  	struct hid_sensor_hub_attribute_info poll;
> 

Re: [PATCH] iio: hid-sensor: Store restore poll and hysteresis on S3

[Jonathan Cameron]

On 08/04/17 15:17, Jonathan Cameron wrote:
> On 08/04/17 01:13, Srinivas Pandruvada wrote:
>> This change undo the change done by 'commit 3bec24747446
>> ("iio: hid-sensor-trigger: Change get poll value function order to avoid
>> sensor properties losing after resume from S3")' as this breaks some
>> USB/i2c sensor hubs.
>>
>> Instead of relying on HW for restoring poll and hysteresis, driver stores
>> and restores on resume (S3). In this way user space modified settings are
>> not lost for any kind of sensor hub behavior.
>>
>> In this change, whenever user space modifies sampling frequency or
>> hysteresis driver will get the feature value from the hub and store in the
>> per device hid_sensor_common data structure. On resume callback from S3,
>> system will set the feature to sensor hub, if user space ever modified the
>> feature value.
>>
>> Fixes: 3bec24747446 ("iio: hid-sensor-trigger: Change get poll value function order to avoid sensor properties losing after resume from S3")
>> Reported-by: Ritesh Raj Sarraf <rrs@researchut.com>
>> Tested-by: Ritesh Raj Sarraf <rrs@researchut.com>
>> Tested-by: Song, Hongyan <hongyan.song@intel.com>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> Applied. Hoping this is the final fix on these related issues!
> 
Srinivas,  one quick comment on this.  Things were left hanging I think in
the thread that lead to it.  I'd have appreciated a tiny bit of history in
here to convince me that Hongyan was happy with the fix (I did compare
this with the original and can see how you changed it, but would have
liked to have not have to have bothered!

Jonathan
> Jonathan
>> ---
>>  .../iio/common/hid-sensors/hid-sensor-attributes.c | 26 ++++++++++++++++++++--
>>  .../iio/common/hid-sensors/hid-sensor-trigger.c    | 20 ++++++++++++++---
>>  include/linux/hid-sensor-hub.h                     |  2 ++
>>  3 files changed, 43 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
>> index 7afdac42..efd3151 100644
>> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
>> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
>> @@ -221,7 +221,15 @@ int hid_sensor_write_samp_freq_value(struct hid_sensor_common *st,
>>  	if (ret < 0 || value < 0)
>>  		ret = -EINVAL;
>>  
>> -	return ret;
>> +	ret = sensor_hub_get_feature(st->hsdev,
>> +				     st->poll.report_id,
>> +				     st->poll.index, sizeof(value), &value);
>> +	if (ret < 0 || value < 0)
>> +		return -EINVAL;
>> +
>> +	st->poll_interval = value;
>> +
>> +	return 0;
>>  }
>>  EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
>>  
>> @@ -266,7 +274,16 @@ int hid_sensor_write_raw_hyst_value(struct hid_sensor_common *st,
>>  	if (ret < 0 || value < 0)
>>  		ret = -EINVAL;
>>  
>> -	return ret;
>> +	ret = sensor_hub_get_feature(st->hsdev,
>> +				     st->sensitivity.report_id,
>> +				     st->sensitivity.index, sizeof(value),
>> +				     &value);
>> +	if (ret < 0 || value < 0)
>> +		return -EINVAL;
>> +
>> +	st->raw_hystersis = value;
>> +
>> +	return 0;
>>  }
>>  EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
>>  
>> @@ -369,6 +386,9 @@ int hid_sensor_get_reporting_interval(struct hid_sensor_hub_device *hsdev,
>>  	/* Default unit of measure is milliseconds */
>>  	if (st->poll.units == 0)
>>  		st->poll.units = HID_USAGE_SENSOR_UNITS_MILLISECOND;
>> +
>> +	st->poll_interval = -1;
>> +
>>  	return 0;
>>  
>>  }
>> @@ -397,6 +417,8 @@ int hid_sensor_parse_common_attributes(struct hid_sensor_hub_device *hsdev,
>>  			HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
>>  			 &st->sensitivity);
>>  
>> +	st->raw_hystersis = -1;
>> +
>>  	sensor_hub_input_get_attribute_info(hsdev,
>>  					    HID_INPUT_REPORT, usage_id,
>>  					    HID_USAGE_SENSOR_TIME_TIMESTAMP,
>> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
>> index ecf592d..6082934 100644
>> --- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
>> +++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
>> @@ -51,6 +51,8 @@ static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
>>  			st->report_state.report_id,
>>  			st->report_state.index,
>>  			HID_USAGE_SENSOR_PROP_REPORTING_STATE_ALL_EVENTS_ENUM);
>> +
>> +		poll_value = hid_sensor_read_poll_value(st);
>>  	} else {
>>  		int val;
>>  
>> @@ -87,9 +89,7 @@ static int _hid_sensor_power_state(struct hid_sensor_common *st, bool state)
>>  	sensor_hub_get_feature(st->hsdev, st->power_state.report_id,
>>  			       st->power_state.index,
>>  			       sizeof(state_val), &state_val);
>> -	if (state)
>> -		poll_value = hid_sensor_read_poll_value(st);
>> -	if (poll_value > 0)
>> +	if (state && poll_value)
>>  		msleep_interruptible(poll_value * 2);
>>  
>>  	return 0;
>> @@ -127,6 +127,20 @@ static void hid_sensor_set_power_work(struct work_struct *work)
>>  	struct hid_sensor_common *attrb = container_of(work,
>>  						       struct hid_sensor_common,
>>  						       work);
>> +
>> +	if (attrb->poll_interval >= 0)
>> +		sensor_hub_set_feature(attrb->hsdev, attrb->poll.report_id,
>> +				       attrb->poll.index,
>> +				       sizeof(attrb->poll_interval),
>> +				       &attrb->poll_interval);
>> +
>> +	if (attrb->raw_hystersis >= 0)
>> +		sensor_hub_set_feature(attrb->hsdev,
>> +				       attrb->sensitivity.report_id,
>> +				       attrb->sensitivity.index,
>> +				       sizeof(attrb->raw_hystersis),
>> +				       &attrb->raw_hystersis);
>> +
>>  	_hid_sensor_power_state(attrb, true);
>>  }
>>  
>> diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
>> index 7ef111d..f32d7c3 100644
>> --- a/include/linux/hid-sensor-hub.h
>> +++ b/include/linux/hid-sensor-hub.h
>> @@ -231,6 +231,8 @@ struct hid_sensor_common {
>>  	unsigned usage_id;
>>  	atomic_t data_ready;
>>  	atomic_t user_requested_state;
>> +	int poll_interval;
>> +	int raw_hystersis;
>>  	struct iio_trigger *trigger;
>>  	int timestamp_ns_scale;
>>  	struct hid_sensor_hub_attribute_info poll;
>>
> 
> --
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> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: [PATCH] iio: hid-sensor: Store restore poll and hysteresis on S3

[Srinivas Pandruvada]

On Sat, 2017-04-08 at 17:10 +0100, Jonathan Cameron wrote:
> On 08/04/17 15:17, Jonathan Cameron wrote:
> > 
> > On 08/04/17 01:13, Srinivas Pandruvada wrote:
> > > 
> > > This change undo the change done by 'commit 3bec24747446
> > > ("iio: hid-sensor-trigger: Change get poll value function order
> > > to avoid
> > > sensor properties losing after resume from S3")' as this breaks
> > > some
> > > USB/i2c sensor hubs.
> > > 
> > > Instead of relying on HW for restoring poll and hysteresis,
> > > driver stores
> > > and restores on resume (S3). In this way user space modified
> > > settings are
> > > not lost for any kind of sensor hub behavior.
> > > 
> > > In this change, whenever user space modifies sampling frequency
> > > or
> > > hysteresis driver will get the feature value from the hub and
> > > store in the
> > > per device hid_sensor_common data structure. On resume callback
> > > from S3,
> > > system will set the feature to sensor hub, if user space ever
> > > modified the
> > > feature value.
> > > 
> > > Fixes: 3bec24747446 ("iio: hid-sensor-trigger: Change get poll
> > > value function order to avoid sensor properties losing after
> > > resume from S3")
> > > Reported-by: Ritesh Raj Sarraf <rrs@researchut.com>
> > > Tested-by: Ritesh Raj Sarraf <rrs@researchut.com>
> > > Tested-by: Song, Hongyan <hongyan.song@intel.com>
> > > Cc: stable@vger.kernel.org
> > > Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.int
> > > el.com>
> > Applied. Hoping this is the final fix on these related issues!
> > 
> Srinivas,  one quick comment on this.  Things were left hanging I
> think in
> the thread that lead to it.  I'd have appreciated a tiny bit of
> history in
> here to convince me that Hongyan was happy with the fix (I did
> compare
> this with the original and can see how you changed it, but would have
> liked to have not have to have bothered!
> 

USB/i2C sensor hubs: First time after boot:
1. - Read feature report for a sensor
This will read the report interval and features from the HW and keep in
updated report field values stored in host memory
2. - Update power and report state in the report fields in host memory
and request to HW. 
3. - Wait for the sensor to power up
This worked for so many hubs from different vendors.

With Hongyan's patch the above behavior changed.
No step 1 was not executed and tried to power up with invalid features
like report interval. So some hub probably silently ignored the
request.
So this broke rotation. For ISH it was fine as ISH ignored invalid
fields and started with default data.

Her intention was
- Don't do step one as we read HW defaults of feature fields after S3
and not the last user modified value before and updated report memory
on host. ISH will restore them after power-up. The USB/i2c hubs kept
last setting across S3 sessions.

So the intention here is keep user space modified value event after S3
for all hubs.

So with this change, we keep the user settings in host memory and
update on resume from S3. This will also basically revert Hongyan's
patch, so old functionality is restored. 

Thanks,
Srinivas

> Jonathan
> > 
> > Jonathan
> > > 
> > > ---
> > >  .../iio/common/hid-sensors/hid-sensor-attributes.c | 26
> > > ++++++++++++++++++++--
> > >  .../iio/common/hid-sensors/hid-sensor-trigger.c    | 20
> > > ++++++++++++++---
> > >  include/linux/hid-sensor-hub.h                     |  2 ++
> > >  3 files changed, 43 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/iio/common/hid-sensors/hid-sensor-
> > > attributes.c b/drivers/iio/common/hid-sensors/hid-sensor-
> > > attributes.c
> > > index 7afdac42..efd3151 100644
> > > --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> > > +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> > > @@ -221,7 +221,15 @@ int hid_sensor_write_samp_freq_value(struct
> > > hid_sensor_common *st,
> > >  	if (ret < 0 || value < 0)
> > >  		ret = -EINVAL;
> > >  
> > > -	return ret;
> > > +	ret = sensor_hub_get_feature(st->hsdev,
> > > +				     st->poll.report_id,
> > > +				     st->poll.index,
> > > sizeof(value), &value);
> > > +	if (ret < 0 || value < 0)
> > > +		return -EINVAL;
> > > +
> > > +	st->poll_interval = value;
> > > +
> > > +	return 0;
> > >  }
> > >  EXPORT_SYMBOL(hid_sensor_write_samp_freq_value);
> > >  
> > > @@ -266,7 +274,16 @@ int hid_sensor_write_raw_hyst_value(struct
> > > hid_sensor_common *st,
> > >  	if (ret < 0 || value < 0)
> > >  		ret = -EINVAL;
> > >  
> > > -	return ret;
> > > +	ret = sensor_hub_get_feature(st->hsdev,
> > > +				     st->sensitivity.report_id,
> > > +				     st->sensitivity.index,
> > > sizeof(value),
> > > +				     &value);
> > > +	if (ret < 0 || value < 0)
> > > +		return -EINVAL;
> > > +
> > > +	st->raw_hystersis = value;
> > > +
> > > +	return 0;
> > >  }
> > >  EXPORT_SYMBOL(hid_sensor_write_raw_hyst_value);
> > >  
> > > @@ -369,6 +386,9 @@ int hid_sensor_get_reporting_interval(struct
> > > hid_sensor_hub_device *hsdev,
> > >  	/* Default unit of measure is milliseconds */
> > >  	if (st->poll.units == 0)
> > >  		st->poll.units =
> > > HID_USAGE_SENSOR_UNITS_MILLISECOND;
> > > +
> > > +	st->poll_interval = -1;
> > > +
> > >  	return 0;
> > >  
> > >  }
> > > @@ -397,6 +417,8 @@ int hid_sensor_parse_common_attributes(struct
> > > hid_sensor_hub_device *hsdev,
> > >  			HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS,
> > >  			 &st->sensitivity);
> > >  
> > > +	st->raw_hystersis = -1;
> > > +
> > >  	sensor_hub_input_get_attribute_info(hsdev,
> > >  					    HID_INPUT_REPORT,
> > > usage_id,
> > >  					    HID_USAGE_SENSOR_TIM
> > > E_TIMESTAMP,
> > > diff --git a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
> > > b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
> > > index ecf592d..6082934 100644
> > > --- a/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
> > > +++ b/drivers/iio/common/hid-sensors/hid-sensor-trigger.c
> > > @@ -51,6 +51,8 @@ static int _hid_sensor_power_state(struct
> > > hid_sensor_common *st, bool state)
> > >  			st->report_state.report_id,
> > >  			st->report_state.index,
> > >  			HID_USAGE_SENSOR_PROP_REPORTING_STATE_AL
> > > L_EVENTS_ENUM);
> > > +
> > > +		poll_value = hid_sensor_read_poll_value(st);
> > >  	} else {
> > >  		int val;
> > >  
> > > @@ -87,9 +89,7 @@ static int _hid_sensor_power_state(struct
> > > hid_sensor_common *st, bool state)
> > >  	sensor_hub_get_feature(st->hsdev, st-
> > > >power_state.report_id,
> > >  			       st->power_state.index,
> > >  			       sizeof(state_val), &state_val);
> > > -	if (state)
> > > -		poll_value = hid_sensor_read_poll_value(st);
> > > -	if (poll_value > 0)
> > > +	if (state && poll_value)
> > >  		msleep_interruptible(poll_value * 2);
> > >  
> > >  	return 0;
> > > @@ -127,6 +127,20 @@ static void hid_sensor_set_power_work(struct
> > > work_struct *work)
> > >  	struct hid_sensor_common *attrb = container_of(work,
> > >  						       struct
> > > hid_sensor_common,
> > >  						       work);
> > > +
> > > +	if (attrb->poll_interval >= 0)
> > > +		sensor_hub_set_feature(attrb->hsdev, attrb-
> > > >poll.report_id,
> > > +				       attrb->poll.index,
> > > +				       sizeof(attrb-
> > > >poll_interval),
> > > +				       &attrb->poll_interval);
> > > +
> > > +	if (attrb->raw_hystersis >= 0)
> > > +		sensor_hub_set_feature(attrb->hsdev,
> > > +				       attrb-
> > > >sensitivity.report_id,
> > > +				       attrb->sensitivity.index,
> > > +				       sizeof(attrb-
> > > >raw_hystersis),
> > > +				       &attrb->raw_hystersis);
> > > +
> > >  	_hid_sensor_power_state(attrb, true);
> > >  }
> > >  
> > > diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-
> > > sensor-hub.h
> > > index 7ef111d..f32d7c3 100644
> > > --- a/include/linux/hid-sensor-hub.h
> > > +++ b/include/linux/hid-sensor-hub.h
> > > @@ -231,6 +231,8 @@ struct hid_sensor_common {
> > >  	unsigned usage_id;
> > >  	atomic_t data_ready;
> > >  	atomic_t user_requested_state;
> > > +	int poll_interval;
> > > +	int raw_hystersis;
> > >  	struct iio_trigger *trigger;
> > >  	int timestamp_ns_scale;
> > >  	struct hid_sensor_hub_attribute_info poll;
> > > 
> > 
> > --
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