linux-kernel - Re: [PATCH v1] HID: sensor-hub: Fixup for Lenovo ThinkPad Helix 2 sensor hub report

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Date:	Thu, 03 Sep 2015 13:00:22 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Fernando D S Lima <fernandodsl@...il.com>
Cc:	Jiri Kosina <jkosina@...e.com>,
	Jonathan Cameron <jic23@...nel.org>,
	linux-input@...r.kernel.org, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] HID: sensor-hub: Fixup for Lenovo ThinkPad Helix 2
 sensor hub report

On Thu, 2015-09-03 at 12:56 -0300, Fernando D S Lima wrote:
> There is an error in the report descriptor of the Thinkpad Helix 2 
> where
> logical minimum value (557376) is greater than logical maximum 
> (491200)
> for all of the magnetic flux axis data fields. This error results in 
> a
> report descriptor parsing failure that causes the sensors attached to 
> the
> hub not to be detected.
> 
> dmesg excerpt:
> [   19.866905] drivers/hid/hid-core.c: logical range invalid 0x88140 
> 0x77ec0
> [   19.866914] hid-sensor-hub 0018:2047:0855.0007: item 0 1 0 8 
> parsing failed
> [   19.866926] hid-sensor-hub 0018:2047:0855.0007: parse failed
> [   19.866933] hid-sensor-hub: probe of 0018:2047:0855.0007 failed 
> with error -22
> 
> Add a report fixup to change magnetic flux logical minimums to 
> -557376
> for the parsing to succeed and the sensors to get detected.
> After applying the fix the sensors get detected, with corresponding 
> drivers
> (hid-accel-3d,hid-gyro-3d,etc) loaded, and its possible to read their 
> values.
> 
> Signed-off-by: Fernando D S Lima <fernandodsl@...il.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

> ---
>  drivers/hid/hid-sensor-hub.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor
> -hub.c
> index 090a1ba..6c94257 100644
> --- a/drivers/hid/hid-sensor-hub.c
> +++ b/drivers/hid/hid-sensor-hub.c
> @@ -593,6 +593,20 @@ static __u8 *sensor_hub_report_fixup(struct 
> hid_device *hdev, __u8 *rdesc,
>  		}
>  	}
>  
> +	/* Checks if the report descriptor of Thinkpad Helix 2 has a 
> logical
> +	 * minimum for magnetic flux axis greater than the maximum 
> */
> +	if (hdev->product == 
> USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
> +		*rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] 
> == 0x40 &&
> +		rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
> +		rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
> +		rdesc[921] == 0x07 && rdesc[922] == 0x00) {
> +		/* Sets negative logical minimum for mag x, y and z 
> */
> +		rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
> +		rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
> +		rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
> +		rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
> +	}
> +
>  	return rdesc;
>  }
>  
--
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