Re: [v2] input: drv260x: Add TI drv260x haptics driver

From: Murphy, Dan
Date: Mon Jul 28 2014 - 14:02:31 EST


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 Murphy
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