/* SPDX-License-Identifier: GPL-2.0-or-later */ #include <acpi/acpi.h> #include <acpi/acpi_device.h> #include <acpi/acpigen.h> #include <acpi/acpigen_usb.h> static const char *power_role_to_str(enum usb_typec_power_role power_role) { switch (power_role) { case TYPEC_POWER_ROLE_SOURCE: return "source"; case TYPEC_POWER_ROLE_SINK: return "sink"; case TYPEC_POWER_ROLE_DUAL: return "dual"; default: return "unknown"; } } static const char *try_power_role_to_str(enum usb_typec_try_power_role try_power_role) { switch (try_power_role) { case TYPEC_TRY_POWER_ROLE_NONE: /* * This should never get returned; if there is no try-power role for a device, * then the try-power-role field is not added to the DSD. Thus, this is just * for completeness. */ return "none"; case TYPEC_TRY_POWER_ROLE_SINK: return "sink"; case TYPEC_TRY_POWER_ROLE_SOURCE: return "source"; default: return "unknown"; } } static const char *data_role_to_str(enum usb_typec_data_role data_role) { switch (data_role) { case TYPEC_DATA_ROLE_DFP: return "host"; case TYPEC_DATA_ROLE_UFP: return "device"; case TYPEC_DATA_ROLE_DUAL: return "dual"; default: return "unknown"; } } /* Add port capabilities as DP properties */ static void add_port_caps(struct acpi_dp *dsd, const struct typec_connector_class_config *config) { acpi_dp_add_string(dsd, "power-role", power_role_to_str(config->power_role)); acpi_dp_add_string(dsd, "data-role", data_role_to_str(config->data_role)); if (config->try_power_role != TYPEC_TRY_POWER_ROLE_NONE) acpi_dp_add_string(dsd, "try-power-role", try_power_role_to_str(config->try_power_role)); } static void add_device_ref(struct acpi_dp *dsd, const char *prop_name, const struct device *dev) { const char *path; char *fresh; if (!dev) return; /* * Unfortunately, the acpi_dp_* API doesn't write out the data immediately, thus we need * different storage areas for all of the strings, so strdup() is used for that. It is * safe to use strdup() here, because the strings are generated at build-time and are * guaranteed to be NUL-terminated (they come from the devicetree). */ path = acpi_device_path(dev); if (path) { fresh = strdup(path); if (fresh) acpi_dp_add_reference(dsd, prop_name, fresh); } } static void add_device_references(struct acpi_dp *dsd, const struct typec_connector_class_config *config) { /* * Add references to the USB port objects so that the consumer of this information can * know whether the port supports USB2, USB3, and/or USB4. */ add_device_ref(dsd, "usb2-port", config->usb2_port); add_device_ref(dsd, "usb3-port", config->usb3_port); add_device_ref(dsd, "usb4-port", config->usb4_port); /* * Add references to the ACPI device(s) which control the orientation, USB data role and * data muxing. */ add_device_ref(dsd, "orientation-switch", config->orientation_switch); add_device_ref(dsd, "usb-role-switch", config->usb_role_switch); add_device_ref(dsd, "mode-switch", config->mode_switch); } void acpigen_write_typec_connector(const struct typec_connector_class_config *config, int port_number, add_custom_dsd_property_cb add_custom_dsd_property) { struct acpi_dp *dsd; char name[5]; /* Create a CONx device */ snprintf(name, sizeof(name), "CON%1X", port_number); acpigen_write_device(name); acpigen_write_name_integer("_ADR", port_number); dsd = acpi_dp_new_table("_DSD"); /* Write out the _DSD table */ acpi_dp_add_integer(dsd, "port-number", port_number); add_port_caps(dsd, config); add_device_references(dsd, config); /* Allow client to add custom properties if desired */ if (add_custom_dsd_property) add_custom_dsd_property(dsd, port_number); acpi_dp_write(dsd); acpigen_pop_len(); /* Device */ }