[Bug 216176] New: ideapad-laptop doesn't expose rapid charge

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216176

            Bug ID: 216176
           Summary: ideapad-laptop doesn't expose rapid charge
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.18.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: tinozzo123@tutanota.com
        Regression: No

Lenovo IdeaPad laptops support a feature named "Rapid Charge", normally usable
on Windows via Lenovo Vantage. However, this feature isn't exposed on
idepad-laptop.c.
According to the Arch Wiki, this feature is still usable via ACPI commands:

To enable:
# echo '\_SB.PCI0.LPC0.EC0.VPC0.SBMC 0x07' > /proc/acpi/call

To disable:
# echo '\_SB.PCI0.LPC0.EC0.VPC0.SBMC 0x08' > /proc/acpi/call

To check, the wiki uses different commands for different laptops. Three of them
are (on all of them, 0x0 stands for off and 0x1 stands for on):
Lenovo IdeaPad 5 14are05
# echo '\_SB.PCI0.LPC0.EC0.FCGM' | tee /proc/acpi/call
# cat /proc/acpi/call; printf '\n'

Lenovo IdeaPad 5 15are05
# echo '\_SB.PCI0.LPC0.EC0.QCHO' > /proc/acpi/call
# cat /proc/acpi/call; printf '\n'

Lenovo IdeaPad Flex 5 14alc05
# echo '\_SB.PCI0.LPC0.EC0.QKCM' | tee /proc/acpi/call
# cat /proc/acpi/call | cut -d '' -f1

Small note, on Lenovo Vantage enabling Rapid Charge disables Battery
Conservation automatically, and enabling Battery Conservation disables Rapid
Charge automatically. The ACPI commands don't have this limitation.

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