On Tue, Feb 23, 2016 at 02:54:45AM +0100, Leif Liddy wrote: > I'm new to kernel development, and there's few fairly large gaps in my > understanding about > how drivers are meant to work, but hopefully you guys can point me in > the right direction. > > The macbook8,1 (early 2015) has a keyboard/trackpad that is seen by > ACPI as a single SPI slave device. > It appears the only method to access the keyboard/trackpad is via > the SPI bus --my goal is the get keyboard/trackpad working. > > I've recently submitted a kernel patch that binds the spi-pxa2xx-pci > driver to the Wildcat Point-LP Serial IO GSPI Controller. With this > patch, the SPI controller appears to be working... > http://www.spinics.net/lists/linux-spi/msg06867.html > > ----------LSHW INFO------------ > *-serial:1 > description: Serial bus controller > product: Wildcat Point-LP Serial IO GSPI Controller #1 > vendor: Intel Corporation > physical id: 15.4 > bus info: pci@0000:00:15.4 > version: 03 > width: 32 bits > clock: 33MHz > capabilities: pm cap_list > configuration: driver=pxa2xx_spi_pci latency=0 > resources: irq:21 memory:c181a000-c181afff > > > What I'm having trouble with is sorting out how to register the SPI > slave device with the SPI controller. > **no slave devices are found when I modprobe the driver. > I'm not sure if this is something that should be done by the spi > driver (by calling an acpi function), or whether I must manually do > it. > > –------------UDEV INFO--------------- > > P: /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/INT33C1:00/APP000D:00 > E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/INT33C1:00/APP000D:00 > E: ID_VENDOR_FROM_DATABASE=Apple Computer Inc > E: MODALIAS=acpi:APP000D:APPLE-SPI-TOPCASE: > E: SUBSYSTEM=acpi > E: USEC_INITIALIZED=13574842 > > **INT33C1 is the SPI master controller > **APP000D is the slave device If the device has ACPI SpiSerialBus() resource in _CRS it should be enumerated automatically by the Linux SPI core. See Documentation/acpi/enumeration.txt. You should also see the device listed under /sys/bus/spi/devices. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
