Hi! > > -As a specific example of this use-case, let's look at vibrate feature on > > -phones. Vibrate function on phones is implemented using PWM pins on SoC or > > -PMIC. There is a need to activate one shot timer to control the vibrate > > -feature, to prevent user space crashes leaving the phone in vibrate mode > > -permanently causing the battery to drain. > > I'm not sure if it is a good idea to remove this description. Users will > still be able to use transient trigger this way. It has been around for > five years already and there are users which employ it in this > particular way [0]. I am. Yes, people were doing that, but no, vibration motor is not a LED. PWM behaviour is different, for example, motor is likely to stop at low PWM values. We do not want people to do that. > Apart from that it's the only documented kernel API for vibrate devices > AFAICT. Input subsystem has force-feedback protocol, which is very often just vibrations. Documentation/input/ff.rst . Nokia N900 phone actually uses that API. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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