linux-kernel - Re: [v2] input: drv260x: Add TI drv260x haptics driver

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Date:	Mon, 28 Jul 2014 13:59:34 -0400
From:	simon@...gewell.org
To:	"Dan Murphy" <dmurphy@...com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	"Michal Malý" 
	<madcatxster@...oid-pointer.net>,
	"Elias Vanderstuyft" <elias.vds@...il.com>
Subject: Re: [v2] input: drv260x: Add TI drv260x haptics driver


>> The initial driver supports the devices
>> real time playback mode.  But the device
>> has additional wave patterns in ROM.
>
> As it presented the device appears to be a memoryless device, however
> you present it to the rest of the system as if it can support playback
> of multiple effects simultaneously, which is incorrect.
>
> My guess that you need to engage the memoryless input library to schedule
> handling multiple effects for your device, including ramping up, ramping
> down, stopping playback when effects runs out, etc.

Hi Dan,
Elias and Michal (cc'ed) are working on a kernel/userland library to
handle sending multiple force feedback signals to 'simple' devices,
perhaps you should engage with them.

Simon

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