/* SPDX-License-Identifier: GPL-2.0-or-later */ #include <acpi/acpigen.h> #include <acpi/acpi_device.h> #include <stdio.h> #include "chip.h" static const char *usb_hub_acpi_name(const struct device *dev) { const char *pattern; struct drivers_usb_hub_config *config = dev->chip_info; if (config->acpi_name[0] != 0) return config->acpi_name; /* USB ACPI driver does not have acpi_name operation defined. Hence return the ACPI name for both the hub and any downstream facing ports. */ switch (dev->path.usb.port_type) { case 0: return "EHUB"; case 2: pattern = "HS%02d"; break; case 3: pattern = "SS%02d"; break; default: return NULL; } snprintf(config->acpi_name, sizeof(config->acpi_name), pattern, dev->path.usb.port_id + 1); return config->acpi_name; } static void usb_hub_add_ports(const struct device *dev) { const struct drivers_usb_hub_config *config = config_of(dev); struct device *port = NULL; unsigned int child_count = 0; while ((port = dev_bus_each_child(dev->downstream, port)) != NULL) { if (child_count++ >= config->port_count) { printk(BIOS_WARNING, "%s cannot be added. Port Count limit reached.\n", dev_name(port)); continue; } acpigen_write_device(usb_hub_acpi_name(port)); acpigen_write_name_byte("_ADR", port->path.usb.port_id + 1); acpigen_write_device_end(); } } static void usb_hub_acpi_fill_ssdt(const struct device *dev) { const struct drivers_usb_hub_config *config = config_of(dev); const char *scope = acpi_device_scope(dev); const char *name = acpi_device_name(dev); acpigen_write_scope(scope); acpigen_write_device(name); acpigen_write_ADR(0); if (config->name) acpigen_write_name_string("_DDN", config->name); if (config->desc) acpigen_write_name_unicode("_STR", config->desc); usb_hub_add_ports(dev); acpigen_write_device_end(); acpigen_write_scope_end(); } static struct device_operations usb_hub_ops = { .read_resources = noop_read_resources, .set_resources = noop_set_resources, .scan_bus = scan_static_bus, .acpi_fill_ssdt = usb_hub_acpi_fill_ssdt, .acpi_name = usb_hub_acpi_name }; static void usb_hub_acpi_enable(struct device *dev) { dev->ops = &usb_hub_ops; } struct chip_operations drivers_usb_hub_ops = { .name = "USB Hub", .enable_dev = usb_hub_acpi_enable };