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authorPavel Machek <pavel@ucw.cz>2020-08-11 15:48:13 +0200
committerPavel Machek <pavel@ucw.cz>2020-08-17 18:04:15 +0200
commita2f8e2b4f1817d9438b281d96ca45ca455707f95 (patch)
treedfd4ae60cc1d0fc57c435e913137b7250d640e3f /Documentation/leds/ledtrig-transient.rst
parentleds: mt6323: move period calculation (diff)
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leds: we don't want people to use LED subsystem for vibrations
Remove notes about vibrations, as that is better done using input subsystem. Signed-off-by: Pavel Machek <pavel@ucw.cz>
Diffstat (limited to 'Documentation/leds/ledtrig-transient.rst')
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diff --git a/Documentation/leds/ledtrig-transient.rst b/Documentation/leds/ledtrig-transient.rst
index eedfa1626e8a..63072f310660 100644
--- a/Documentation/leds/ledtrig-transient.rst
+++ b/Documentation/leds/ledtrig-transient.rst
@@ -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
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 can be enabled and disabled just like the other leds
triggers.
@@ -159,7 +153,6 @@ repeat the following step as needed::
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 a kind of watchdog indicator -- as
long as the app is alive, it can keep the LED illuminated, if it dies