Hi Henrik,
On Thu, Jan 27, 2011 at 13:06, Henrik Rydberg <rydberg@xxxxxxxxxxx> wrote:
> Hi Benjamin,
>
> On Thu, Jan 27, 2011 at 11:35:46AM +0100, Benjamin Tissoires wrote:
>> This patch adds the function input_mt_get_abs_value(), which may be
>
> Ehm, input_mt_get_absinfo?
In fact, the idea was to put this on the table again ;). I have no
idea of what is the right think to do in such case.
So I'll take all comments.
>
>> used to extract the current state of the MT slots.
>>
>> Signed-off-by: Henrik Rydberg <rydberg@xxxxxxxxxxx>
>
> I had rather re-add this myself, thanks.
That was my question. Plus I had a subliminal message in which I
intend you to take the drive on this work. ;)
>
>> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxx>
>> ---
>> drivers/input/input-mt.c | 32 ++++++++++++++++++++++++++++++++
>> include/linux/input/mt.h | 1 +
>> 2 files changed, 33 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c
>> index c48c81f..5b95e38 100644
>> --- a/drivers/input/input-mt.c
>> +++ b/drivers/input/input-mt.c
>> @@ -168,3 +168,35 @@ void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count)
>> }
>> }
>> EXPORT_SYMBOL(input_mt_report_pointer_emulation);
>> +
>> +/**
>> + * input_mt_get_absinfo - retrieve MT state variables from a device slot
>> + * @dev: input device which state is being queried
>> + * @code: ABS code to retrieve
>> + * @slot: slot to retrieve from
>> + *
>> + * Return the ABS state of the given MT slot. If code is not an MT
>> + * event, the corresponding ABS event is returned.
>> + *
>> + * This function may be called by anyone interested in extracting the
>> + * current MT state. Used by evdev handlers.
>> + */
>> +struct input_absinfo input_mt_get_absinfo(struct input_dev *dev, unsigned int code, int slot)
>
> Why return the struct? Give it a pointer instead, so the return value
> can be used for errors.
Quick and dirty think. Maybe the old implementation is better.
>
> Also, I wonder about the usefulness of extracting the absinfo here -
> only the value depends on the slot argument, and absinfo does not
> require the same lock protection. Why not keep the layout from the
> original patch?
same above
>
>> +{
>> + unsigned int mtmap = code > ABS_MT_FIRST ? code - ABS_MT_FIRST : 0;
>
> Should rather return -EINVAL on bad argument.
I did not know how to handle the original code:
"unsigned int mtmap = input_mt_abs_map[code];"
Now I know.
>
>> + unsigned long flags;
>> + struct input_absinfo retval;
>> +
>> + spin_lock_irqsave(&dev->event_lock, flags);
>> + if (!mtmap)
>> + retval = dev->absinfo[code];
>> + else if (slot >= 0 && slot < dev->mtsize) {
>> + retval = dev->absinfo[code];
>> + retval.value = dev->mt[slot].abs[mtmap];
>
> Please use input_mt_get_value().
This is a problem when working with code that was send 6 months ago.
>
>> + } else
>> + retval.value = 0;
>> + spin_unlock_irqrestore(&dev->event_lock, flags);
>> +
>> + return retval;
>> +}
>> +EXPORT_SYMBOL(input_mt_get_absinfo);
>> diff --git a/include/linux/input/mt.h b/include/linux/input/mt.h
>> index b3ac06a..a71a27f 100644
>> --- a/include/linux/input/mt.h
>> +++ b/include/linux/input/mt.h
>> @@ -54,4 +54,5 @@ void input_mt_report_slot_state(struct input_dev *dev,
>> void input_mt_report_finger_count(struct input_dev *dev, int count);
>> void input_mt_report_pointer_emulation(struct input_dev *dev, bool use_count);
>>
>> +struct input_absinfo input_mt_get_absinfo(struct input_dev *dev, unsigned int code, int slot);
>> #endif
>
> Thanks,
> Henrik
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