Re: Regulator

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

On Wed, Jan 12, 2022 at 07:59:27PM +0000, Taylor R Campbell wrote:
> Can you say more about the platform this is on?  How do you discover
> the touchscreen device -- via what kind of firmware or bus/device
> enumeration?  If this is acpi, can you share acpidump -dt?  Do you
> have documentation for the hardware you can share?

This is a One Netbook A1. An amd64 platform with ACPI.
According to this post, the touchscreen is powered by a Goodix GXTP7386
https://handheld.computer/?page_id=1131

That device is in ACPI DSDT (see below). Taking insights from 
linux/drivers/input/touchscreen/goodix.c I match it using
static const struct device_compatible_entry compat_data[] = {
        { .compat = "GDIX1001" },
        { .compat = "GDIX1002" },
        DEVICE_COMPAT_EOL
};    

Oddly, that brings me two devices, GXTP7386 and BOSC0200.

Here is acpidrump -dt: https://ftp.espci.fr/shadow/manu/acpidump
Here is GXTP7386 from DSDT:
        Device (TPL1)
        {            Name (HID2, One)
            Name (_HID, "GXTP7386")  // _HID: Hardware ID
            Name (_CID, "PNP0C50" /* HID Protocol Device (I2C bus) */)  // _CID:
 Compatible ID
            Name (_S0W, Zero)  // _S0W: S0 Device Wake State
            Method (_DSM, 4, Serialized)  // _DSM: Device-Specific Method
            {
                If ((Arg0 == HIDG))
                {
                    Return (HIDD (Arg0, Arg1, Arg2, Arg3, HID2))
                }

                Return (Buffer (One)
                {
                     0x00                                             // .
                })
            }

            Method (_STA, 0, NotSerialized)  // _STA: Status
            {
                Return (0x0F)
            }

            Method (_CRS, 0, NotSerialized)  // _CRS: Current Resource Settings
            {
                Name (RBUF, ResourceTemplate ()
                {
                    I2cSerialBusV2 (0x005D, ControllerInitiated, 0x00061A80,
                        AddressingMode7Bit, "\\_SB.PCI0.I2C2",
                        0x00, ResourceConsumer, , Exclusive,
                        )
                    GpioInt (Level, ActiveLow, Shared, PullDefault, 0x0000,
                        "\\_SB.PCI0.GPI0", 0x00, ResourceConsumer, ,
                        )
                        {   // Pin list
                            0x007F
                        }
                })
                Return (RBUF) /* \_SB_.PCI0.I2C2.TPL1._CRS.RBUF */
            }
        }


-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost