From fbf2c79b489a526e5ab7359ce56be0b4b66c854b Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Mon, 26 Sep 2016 10:31:22 -0700 Subject: drivers/i2c/generic: Add config for marking device as probed Add a config option to the generic I2C device driver to indicate to the OS that this device should be probed before being added. This can be used to provide ACPI device instantiations to devices that may not actually exist on the board. For example, if multiple trackpad vendors are supported on the same board they can both be described in ACPI and the OS will probe the address and load the driver only if the device responds to the probe at that address. BUG=chrome-os-partner:57686 Change-Id: I22cffb4b15f25d97dfd37dc58bca315f57bafc59 Signed-off-by: Duncan Laurie Reviewed-on: https://review.coreboot.org/16742 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/drivers/i2c/generic/generic.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'src/drivers/i2c/generic/generic.c') diff --git a/src/drivers/i2c/generic/generic.c b/src/drivers/i2c/generic/generic.c index 62e2e9a813..30a280bcff 100644 --- a/src/drivers/i2c/generic/generic.c +++ b/src/drivers/i2c/generic/generic.c @@ -35,6 +35,7 @@ static void i2c_generic_fill_ssdt(struct device *dev) .speed = config->speed ? : I2C_SPEED_FAST, .resource = scope, }; + struct acpi_dp *dsd = NULL; if (!dev->enabled || !scope) return; @@ -65,6 +66,12 @@ static void i2c_generic_fill_ssdt(struct device *dev) acpigen_write_PRW(config->wake, 3); } + if (config->probed) { + dsd = acpi_dp_new_table("_DSD"); + acpi_dp_add_integer(dsd, "linux,probed", 1); + acpi_dp_write(dsd); + } + acpigen_pop_len(); /* Device */ acpigen_pop_len(); /* Scope */ -- cgit v1.2.3