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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <stdlib.h>
#include "chip.h"
static const char *usb_hub_acpi_name(const struct device *dev)
{
char *name;
const char *pattern;
/* 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;
}
name = malloc(ACPI_NAME_BUFFER_SIZE);
snprintf(name, ACPI_NAME_BUFFER_SIZE, pattern, dev->path.usb.port_id + 1);
name[4] = '\0';
return 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->link_list, 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 = {
CHIP_NAME("USB Hub")
.enable_dev = usb_hub_acpi_enable
};
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