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-rw-r--r--src/drivers/i2c/generic/chip.h9
-rw-r--r--src/drivers/i2c/generic/generic.c7
2 files changed, 16 insertions, 0 deletions
diff --git a/src/drivers/i2c/generic/chip.h b/src/drivers/i2c/generic/chip.h
index 84657d5241..d84097f6c6 100644
--- a/src/drivers/i2c/generic/chip.h
+++ b/src/drivers/i2c/generic/chip.h
@@ -10,6 +10,15 @@ struct drivers_i2c_generic_config {
unsigned wake; /* Wake GPE */
struct acpi_irq irq; /* Interrupt */
+ /*
+ * This flag will add a device propery which will indicate
+ * to the OS that it should probe this device before adding it.
+ *
+ * This can be used to declare a device that may not exist on
+ * the board, for example to support multiple trackpad vendors.
+ */
+ int probed;
+
/* GPIO used to indicate if this device is present */
unsigned device_present_gpio;
unsigned device_present_gpio_invert;
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 */