On Wed, Feb 11, 2009 at 12:46 AM, Éric Piel <Eric.Piel@xxxxxxxxxxxxxxxx> wrote:
> Giuseppe Bilotta schreef:
>>
>> 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.
>>
>> 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.
>>
>> Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@xxxxxxxxx>
>> ---
>>
>> This is the other version of the patch, and it changes access to use the
>> base address from the 8-bit, so the 16-bit routine is changed to access
>> the PREVIOUS byte for the LSB.
>>
>> Choose whichever of the patches is deemed more correct 8-)
>>
>> Note that both patches are based off Linus tree, so I don't know how
>> they cope with Pavel's "don't touch too much on init" one. I'll try to
>> work out a patch on top of that too.
>
> Yes, great, and this one looks even better than v1 :-)
And don't forget about the v3 for -mm ;-)
> However I'm not sure about the conversion between s8 and s16:
>
>> +static s16 lis3lv02d_read_8(acpi_handle handle, int reg)
>> +{
>> + u8 lo;
>> + adev.read(handle, reg, &lo);
>> + return *((s8*)(&lo));
>> +}
>
> Does it really extend the sign to 16 bits? I would have written it this way:
> +static s16 lis3lv02d_read_8(acpi_handle handle, int reg)
> +{
> + s8 lo;
> + adev.read(handle, reg, &lo);
> + return (s16)lo;
> +}
> Doesn't it work better?
Well, the previous one works, but I admit it's horribly convoluted.
I'll double check with this one and resubmit (I'll only resubmit the
one based on Pavel's "don't touch anything on init" probably though,
hope it's ok)
--
Giuseppe "Oblomov" Bilotta
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