linux-kernel - Re: [PATCHv7] lis3lv02d: support both one- and two-byte sensors

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Message-ID: <cb7bb73a0902111444h46be9b65pa01d4b2b9c31afe8@mail.gmail.com>
Date:	Wed, 11 Feb 2009 23:44:20 +0100
From:	Giuseppe Bilotta <giuseppe.bilotta@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, eric.piel@...mplin-utc.net,
	pavel@...e.cz
Subject: Re: [PATCHv7] lis3lv02d: support both one- and two-byte sensors

On Wed, Feb 11, 2009 at 11:38 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Wed, 11 Feb 2009 11:06:43 +0100
> Giuseppe Bilotta <giuseppe.bilotta@...il.com> wrote:
>
>> Sensors responding with 0x3B to WHO_AM_I only have one data register per
>> direction, thus returning a signed byte from the position which is
>> occupied by the MSB in sensors responding with 0x3A.
>>
>> Since multiple sensors share the reply to WHO_AM_I, we rename the
>> defines to better indicate what they identify (family of single and
>> double precision sensors).
>>
>> We support both kind of sensors by checking for the sensor type on init
>> and defining appropriate data-access routines and sensor limits (for the
>> joystick) depending on what we find.
>>
>
> Which tree is this patch against?
>
>> --- a/drivers/hwmon/lis3lv02d.c
>> +++ b/drivers/hwmon/lis3lv02d.c
>> @@ -53,9 +53,6 @@
>>   * joystick.
>>   */
>>
>> -/* Maximum value our axis may get for the input device (signed 12 bits) */
>> -#define MDPS_MAX_VAL 2048
>> -
>>  struct acpi_lis3lv02d adev = {
>>       .misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(adev.misc_wait),
>>  };
>
> Current Linus mainline has
>
> struct acpi_lis3lv02d adev;
> EXPORT_SYMBOL_GPL(adev);
>
> here.

I based my patch on Linus' tree, plus Pavel's patch which I've been
told is on your tree.

Is your tree available for git? I can try basing it on yours directly.

> Also, this comment:
>
> /*
>  * The sensor can also generate interrupts (DRDY) but it's pretty pointless
>  * because their are generated even if the data do not change. So it's better
>  * to keep the interrupt for the free-fall event. The values are updated at
>  * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
>  * some low processor, we poll the sensor only at 20Hz... enough for the
>  * joystick.
>  */
>
> seems to be describing something which isn't there.

I have no idea about that, I didn't touch it at all.

-- 
Giuseppe "Oblomov" Bilotta
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