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7f4a633d21
Add a 'continuous' option for usb charging which enables the "linear" charging mode of the twl4030. Linear charging does a good job with not-so-reliable power sources. Auto mode does not work well as it switches off when voltage drops momentarily. Care must be taken not to over-charge. It was used with a bike hub dynamo since a year or so. In that case there are automatically charging stops when the cyclist needs a break. Original-by: Andreas Kemnade <andreas@kemnade.info> Signed-off-by: NeilBrown <neil@brown.name> Signed-off-by: Sebastian Reichel <sre@kernel.org>
36 lines
1.0 KiB
Plaintext
36 lines
1.0 KiB
Plaintext
What: /sys/class/power_supply/twl4030_ac/max_current
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/sys/class/power_supply/twl4030_usb/max_current
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Description:
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Read/Write limit on current which may
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be drawn from the ac (Accessory Charger) or
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USB port.
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Value is in micro-Amps.
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Value is set automatically to an appropriate
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value when a cable is plugged or unplugged.
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Value can the set by writing to the attribute.
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The change will only persist until the next
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plug event. These event are reported via udev.
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What: /sys/class/power_supply/twl4030_usb/mode
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Description:
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Changing mode for USB port.
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Writing to this can disable charging.
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Possible values are:
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"auto" - draw power as appropriate for detected
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power source and battery status.
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"off" - do not draw any power.
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"continuous"
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- activate mode described as "linear" in
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TWL data sheets. This uses whatever
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current is available and doesn't switch off
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when voltage drops.
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This is useful for unstable power sources
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such as bicycle dynamo, but care should
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be taken that battery is not over-charged.
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