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leds: we don't want people to use LED subsystem for vibrations

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Remove notes about vibrations, as that is better done using input
subsystem.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Pavel Machek
2020-08-11 15:48:13 +02:00
parent fa31311c31
commit a2f8e2b4f1
1 changed files with 0 additions and 7 deletions
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7
Documentation/leds/ledtrig-transient.rst
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@@ -17,12 +17,6 @@ set a timer to hold a state, however when user space application crashes or
goes away without deactivating the timer, the hardware will be left in that goes away without deactivating the timer, the hardware will be left in that
state permanently. state permanently.
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.
Transient trigger addresses the need for one shot timer activation. The Transient trigger addresses the need for one shot timer activation. The
transient trigger can be enabled and disabled just like the other leds transient trigger can be enabled and disabled just like the other leds
triggers. triggers.
@@ -159,7 +153,6 @@ repeat the following step as needed::
This trigger is intended to be used for the following example use cases: This trigger is intended to be used for the following example use cases:
- Control of vibrate (phones, tablets etc.) hardware by user space app.
- Use of LED by user space app as activity indicator. - Use of LED by user space app as activity indicator.
- Use of LED by user space app as a kind of watchdog indicator -- as - Use of LED by user space app as a kind of watchdog indicator -- as
long as the app is alive, it can keep the LED illuminated, if it dies long as the app is alive, it can keep the LED illuminated, if it dies