linux/drivers/platform/x86/serdev_helpers.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * In some cases UART attached devices which require an in kernel driver,
 * e.g. UART attached Bluetooth HCIs are described in the ACPI tables
 * by an ACPI device with a broken or missing UartSerialBusV2() resource.
 *
 * This causes the kernel to create a /dev/ttyS# char-device for the UART
 * instead of creating an in kernel serdev-controller + serdev-device pair
 * for the in kernel driver.
 *
 * The quirk handling in acpi_quirk_skip_serdev_enumeration() makes the kernel
 * create a serdev-controller device for these UARTs instead of a /dev/ttyS#.
 *
 * Instantiating the actual serdev-device to bind to is up to pdx86 code,
 * this header provides a helper for getting the serdev-controller device.
 */
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/printk.h>
#include <linux/sprintf.h>
#include <linux/string.h>

static inline struct device *
get_serdev_controller(const char *serial_ctrl_hid,
		      const char *serial_ctrl_uid,
		      int serial_ctrl_port,
		      const char *serdev_ctrl_name)
{ … }