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From: "Pandruvada, Srinivas" <srinivas.pandruvada-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: "linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"Song,
	Hongyan" <hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	"linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Cc: "jikos-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org"
	<jikos-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org"
	<jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH] iio: hid: hid-sensor-accel-3d: Add second ACC sensor support
Date: Fri, 17 Mar 2017 02:13:35 +0000	[thread overview]
Message-ID: <1489716812.10281.4.camel@intel.com> (raw)
In-Reply-To: <1489659652-35608-1-git-send-email-hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

On Thu, 2017-03-16 at 18:20 +0800, Song Hongyan wrote:
> As accelerometer sensor becomes more and more popular, there are more
> user scenarios have been developed, "Hinge" is a very important
> usecase
> which needs two accelerometer sensors to calculate the included angle
> of keyboard and screen.
> In this case, two accelerometer sensors will be exposed. Currently,
> IIO interface hasn't other way to distinguish two sensors with same
> sensor type, except sensor name. So a new sensor name "accel_2nd_3d"
> is added for secondary accelerometer sensor.

This type of interface will not satisfy all cases. We have some hubs
with  many accelerometers attached. Same case is also true even for
discrete sensors. So there should be some framework way to expose
location of sensors.

ACPI has special method called _PLD (Physical Device Location), which
can  be used to specify location of any device. So we need to be able
to export such information to user space. We can add for each sensor
the location information.

I can propose some ABI for exporting location information.

Thought?

Thanks,
Srinivas


> 
> In HID level, connection type is a good common property to
> differentiate two sensors with same sensor type.
> 
> Signed-off-by: Song Hongyan <hongyan.song@intel.com>
> ---
>  drivers/iio/accel/hid-sensor-accel-3d.c            | 35
> ++++++++++++++++++++--
>  .../iio/common/hid-sensors/hid-sensor-attributes.c |  5 ++++
>  include/linux/hid-sensor-hub.h                     |  1 +
>  include/linux/hid-sensor-ids.h                     |  1 +
>  4 files changed, 40 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/accel/hid-sensor-accel-3d.c
> b/drivers/iio/accel/hid-sensor-accel-3d.c
> index ca5759c..cc4366e 100644
> --- a/drivers/iio/accel/hid-sensor-accel-3d.c
> +++ b/drivers/iio/accel/hid-sensor-accel-3d.c
> @@ -31,6 +31,13 @@
>  #include <linux/iio/triggered_buffer.h>
>  #include "../common/hid-sensors/hid-sensor-trigger.h"
>  
> +enum connection_type {
> +	CONN_PC_INTEGRATED_SEL,
> +	CONN_PC_ATTACHED_SEL,
> +	CONN_PC_EXTERNAL_SEL,
> +	CONN_TYPE_MAX,
> +};
> +
>  enum accel_3d_channel {
>  	CHANNEL_SCAN_INDEX_X,
>  	CHANNEL_SCAN_INDEX_Y,
> @@ -343,6 +350,19 @@ static int accel_3d_parse_report(struct
> platform_device *pdev,
>  	return ret;
>  }
>  
> +int connection_type_check(struct hid_sensor_common *st, int
> *conn_tp)
> +{
> +	int ret;
> +
> +	ret = sensor_hub_get_feature(st->hsdev, st-
> >conn_type.report_id,
> +		st->conn_type.index, sizeof(*conn_tp), conn_tp);
> +
> +	if (ret < 0 || conn_tp < 0)
> +		return -EINVAL;
> +
> +	return ret;
> +}
> +
>  /* Function to initialize the processing for usage id */
>  static int hid_accel_3d_probe(struct platform_device *pdev)
>  {
> @@ -352,6 +372,7 @@ static int hid_accel_3d_probe(struct
> platform_device *pdev)
>  	struct accel_3d_state *accel_state;
>  	const struct iio_chan_spec *channel_spec;
>  	int channel_size;
> +	s32 conn_type;
>  
>  	struct hid_sensor_hub_device *hsdev = pdev-
> >dev.platform_data;
>  
> @@ -367,11 +388,9 @@ static int hid_accel_3d_probe(struct
> platform_device *pdev)
>  	accel_state->common_attributes.pdev = pdev;
>  
>  	if (hsdev->usage == HID_USAGE_SENSOR_ACCEL_3D) {
> -		name = "accel_3d";
>  		channel_spec = accel_3d_channels;
>  		channel_size = sizeof(accel_3d_channels);
>  	} else {
> -		name = "gravity";
>  		channel_spec = gravity_channels;
>  		channel_size = sizeof(gravity_channels);
>  	}
> @@ -387,6 +406,18 @@ static int hid_accel_3d_probe(struct
> platform_device *pdev)
>  		dev_err(&pdev->dev, "failed to duplicate
> channels\n");
>  		return -ENOMEM;
>  	}
> +
> +	ret = connection_type_check(&accel_state->common_attributes,
> +				&conn_type);
> +
> +	if (hsdev->usage == HID_USAGE_SENSOR_ACCEL_3D) {
> +		if (conn_type == CONN_PC_EXTERNAL_SEL)
> +			name = "accel_2nd_3d";
> +		else
> +			name = "accel_3d";
> +	} else
> +		name = "gravity";
> +
>  	ret = accel_3d_parse_report(pdev, hsdev,
>  				(struct iio_chan_spec *)indio_dev-
> >channels,
>  				hsdev->usage, accel_state);
> diff --git a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> index 4f280ae..cc2ce2a 100644
> --- a/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> +++ b/drivers/iio/common/hid-sensors/hid-sensor-attributes.c
> @@ -400,6 +400,11 @@ int hid_sensor_parse_common_attributes(struct
> hid_sensor_hub_device *hsdev,
>  			 &st->sensitivity);
>  
>  	sensor_hub_input_get_attribute_info(hsdev,
> +					HID_FEATURE_REPORT,
> usage_id,
> +					HID_USAGE_SENSOR_PROP_CONN_T
> YPE,
> +					&st->conn_type);
> +
> +	sensor_hub_input_get_attribute_info(hsdev,
>  					    HID_INPUT_REPORT,
> usage_id,
>  					    HID_USAGE_SENSOR_TIME_TI
> MESTAMP,
>  					    &timestamp);
> diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-
> sensor-hub.h
> index 7ef111d..08756a9 100644
> --- a/include/linux/hid-sensor-hub.h
> +++ b/include/linux/hid-sensor-hub.h
> @@ -237,6 +237,7 @@ 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 conn_type;
>  	struct work_struct work;
>  };
>  
> diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-
> sensor-ids.h
> index 719c928..2d349f7 100644
> --- a/include/linux/hid-sensor-ids.h
> +++ b/include/linux/hid-sensor-ids.h
> @@ -135,6 +135,7 @@
>  #define HID_USAGE_SENSOR_UNITS_DEGREES_PER_SECOND		0x1
> 5
>  
>  /* Common selectors */
> +#define HID_USAGE_SENSOR_PROP_CONN_TYPE				
> 0x200309
>  #define HID_USAGE_SENSOR_PROP_REPORT_INTERVAL			
> 0x20030E
>  #define HID_USAGE_SENSOR_PROP_SENSITIVITY_ABS			
> 0x20030F
>  #define HID_USAGE_SENSOR_PROP_SENSITIVITY_RANGE_PCT		0
> x200310

WARNING: multiple messages have this Message-ID
From: "Pandruvada, Srinivas" <srinivas.pandruvada@intel.com>
To: "linux-input@vger.kernel.org" <linux-input@vger.kernel.org>,
	"Song, Hongyan" <hongyan.song@intel.com>,
	"linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>
Cc: "jikos@kernel.org" <jikos@kernel.org>,
	"jic23@kernel.org" <jic23@kernel.org>
Subject: Re: [PATCH] iio: hid: hid-sensor-accel-3d: Add second ACC sensor support
Date: Fri, 17 Mar 2017 02:13:35 +0000	[thread overview]
Message-ID: <1489716812.10281.4.camel@intel.com> (raw)
In-Reply-To: <1489659652-35608-1-git-send-email-hongyan.song@intel.com>

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  parent reply	other threads:[~2017-03-17  2:13 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-16 10:20 Song Hongyan
2017-03-16 10:20 ` Song Hongyan
2017-03-16 12:01 ` Bastien Nocera
     [not found]   ` <1489665702.18490.12.camel-0MeiytkfxGOsTnJN9+BGXg@public.gmane.org>
2017-03-17  1:21     ` Song, Hongyan
2017-03-17  1:21       ` Song, Hongyan
2017-03-17 13:14       ` Bastien Nocera
     [not found] ` <1489659652-35608-1-git-send-email-hongyan.song-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-03-17  2:13   ` Pandruvada, Srinivas [this message]
2017-03-17  2:13     ` Pandruvada, Srinivas
2017-03-17 13:16     ` Bastien Nocera
     [not found]       ` <1489756594.18490.22.camel-0MeiytkfxGOsTnJN9+BGXg@public.gmane.org>
2017-03-17 13:31         ` Jonathan Cameron
2017-03-17 13:31           ` Jonathan Cameron
2017-03-17 16:22       ` Pandruvada, Srinivas
2017-03-17 16:22         ` Pandruvada, Srinivas
2017-03-18  0:24         ` Milton Mobley

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