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

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Date:	Mon, 28 Jul 2014 18:02:23 +0000
From:	"Murphy, Dan" <dmurphy@...com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [v2] input: drv260x: Add TI drv260x haptics driver

Dmitry

Thanks for the comments

On 07/28/2014 12:43 PM, Dmitry Torokhov wrote:
> Hi Dan,
> 
> On Mon, Jul 28, 2014 at 11:53:23AM -0500, Dan Murphy wrote:
>> Add the TI drv260x haptics/vibrator driver.
>> This device uses the input force feedback
>> to produce a wave form to driver an
>> ERM or LRA actuator device.
>>
>> 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.
> 
> Thanks.
>  
> 


I had written the driver originally to be a memless device.

But when calling the driver from user space I was not getting the duration,
strength of any information from the ff_device structure except the type.
The values in the structure were all being passed as 0's.

I will attempt it again as a memless device.

Dan

-- 
------------------
Dan Murphy
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