lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 21 Apr 2009 09:07:06 +0300
From:	Mike Rapoport <mike@...pulab.co.il>
To:	James Kosin <jkosin@...a.intcomgrp.com>
CC:	linux-kernel@...r.kernel.org, Mike Rapoport <mike@...pulab.co.il>
Subject: Re: [RFD] voltage/current regulator consumer interface



James Kosin wrote:
> Mike Rapoport wrote:
>> Hi,
>>
>> Recently there was a brief discussion on linux-arm-kernel list [1] about
>> controlling voltage regulator state in cases when there is no consumer device
>> for a particular regulator.
>>
>> I have some thoughts but I'd like to know people opinion before I start
>> implementation.
>>
>> Problem
>> -------
>> The regulator framework API provides ability to control the state of
>> voltage/current regulators from within the kernel. Usually the regulator
>> supplies power to a device and device driver or some hooks to the platform code
>> from the device driver manipulate the regulator state. However, the regulator
>> framework does not have userspace ABI that allows regulator state modifications.
>> Lack of this ABI prevents fine-grained control for power consumption of devices
>> such as GPS trancievers and GSM modems. Moreover, in SoC based systems it is
>> possible to switch on/off power to entire subsystem when it is not used.
>>
> 
> 
> I'd also ask the question, Why?
> If exposing to user space it leaves the possibility of damaging hardware
> or completely frying a board.

Suppose you have a handheld device with GPS transceiver. You would like to give
user the ability to switch the transceiver on and off.

> 
> James
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

-- 
Sincerely yours,
Mike.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists