summaryrefslogtreecommitdiff
path: root/src/drivers/i2c/generic/Makefile.inc
AgeCommit message (Collapse)Author
2016-06-02i2c: Add a generic i2c driverDuncan Laurie
This adds a generic I2C driver that can be described in the devicetree and used to generate ACPI objects in the SSDT based on the information provided in the config registers. The I2C bus can be configured and the device can provide an interrupt and wake capability to the OS. A configuration option allows for a GPIO to be provided that will be checked to determine if the device is preset on the board before including it in the generated SSDT. The driver is generic enough to be used for basic I2C devices that do not have special configuration needs such as touchpads, touchscreens, sensors, some audio codec/amplifiers, etc. Sample usage for a touchpad device: device pci 15.1 on chip drivers/i2c/generic register "hid" = ""ELAN0000"" register "desc" = "ELAN Touchpad" register "irq" = "IRQ_EDGE_LOW(GPP_B3_IRQ)" register "wake" = "GPE0_DW0_05" device i2c 15.0 on end end end Will result in the following code in the SSDT: Scope (\_SB.PCI0.I2C1) { Device (D015) { Name (_HID, "ELAN0000") Name (_UID, 0) Name (_S0W, 4) Name (_PRW, Package () { 5, 3 }) Method (_STA) { Return (0x0f) } Name (_CRS, ResourceTemplate () { I2cSerialBus (0x15, ControllerInitiated, 400000, AddressingMode7Bit, "\\_S.PCI0.I2C1", 0, ResourceConsumer) Interrupt (ResourceConsumer, Edge, ActiveLow) { 51 } }) } } Change-Id: Ib32055720835b70e91ede5e4028ecd91894d70d5 Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://review.coreboot.org/15016 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>