linux/include/linux/serdev.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <[email protected]>
 */
#ifndef _LINUX_SERDEV_H
#define _LINUX_SERDEV_H

#include <linux/types.h>
#include <linux/device.h>
#include <linux/iopoll.h>
#include <linux/uaccess.h>
#include <linux/termios.h>
#include <linux/delay.h>

struct serdev_controller;
struct serdev_device;

/*
 * serdev device structures
 */

/**
 * struct serdev_device_ops - Callback operations for a serdev device
 * @receive_buf:	Function called with data received from device;
 *			returns number of bytes accepted; may sleep.
 * @write_wakeup:	Function called when ready to transmit more data; must
 *			not sleep.
 */
struct serdev_device_ops { … };

/**
 * struct serdev_device - Basic representation of an serdev device
 * @dev:	Driver model representation of the device.
 * @nr:		Device number on serdev bus.
 * @ctrl:	serdev controller managing this device.
 * @ops:	Device operations.
 * @write_comp	Completion used by serdev_device_write() internally
 * @write_lock	Lock to serialize access when writing data
 */
struct serdev_device { … };

static inline struct serdev_device *to_serdev_device(struct device *d)
{ … }

/**
 * struct serdev_device_driver - serdev slave device driver
 * @driver:	serdev device drivers should initialize name field of this
 *		structure.
 * @probe:	binds this driver to a serdev device.
 * @remove:	unbinds this driver from the serdev device.
 */
struct serdev_device_driver { … };

static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d)
{ … }

enum serdev_parity { … };

/*
 * serdev controller structures
 */
struct serdev_controller_ops { … };

/**
 * struct serdev_controller - interface to the serdev controller
 * @dev:	Driver model representation of the device.
 * @host:	Serial port hardware controller device
 * @nr:		number identifier for this controller/bus.
 * @serdev:	Pointer to slave device for this controller.
 * @ops:	Controller operations.
 */
struct serdev_controller { … };

static inline struct serdev_controller *to_serdev_controller(struct device *d)
{ … }

static inline void *serdev_device_get_drvdata(const struct serdev_device *serdev)
{ … }

static inline void serdev_device_set_drvdata(struct serdev_device *serdev, void *data)
{ … }

/**
 * serdev_device_put() - decrement serdev device refcount
 * @serdev	serdev device.
 */
static inline void serdev_device_put(struct serdev_device *serdev)
{ … }

static inline void serdev_device_set_client_ops(struct serdev_device *serdev,
					      const struct serdev_device_ops *ops)
{ … }

static inline
void *serdev_controller_get_drvdata(const struct serdev_controller *ctrl)
{ … }

static inline void serdev_controller_set_drvdata(struct serdev_controller *ctrl,
					       void *data)
{ … }

/**
 * serdev_controller_put() - decrement controller refcount
 * @ctrl	serdev controller.
 */
static inline void serdev_controller_put(struct serdev_controller *ctrl)
{ … }

struct serdev_device *serdev_device_alloc(struct serdev_controller *);
int serdev_device_add(struct serdev_device *);
void serdev_device_remove(struct serdev_device *);

struct serdev_controller *serdev_controller_alloc(struct device *host,
						  struct device *parent,
						  size_t size);
int serdev_controller_add(struct serdev_controller *);
void serdev_controller_remove(struct serdev_controller *);

static inline void serdev_controller_write_wakeup(struct serdev_controller *ctrl)
{ … }

static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl,
						   const u8 *data,
						   size_t count)
{ … }

#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)

int serdev_device_open(struct serdev_device *);
void serdev_device_close(struct serdev_device *);
int devm_serdev_device_open(struct device *, struct serdev_device *);
unsigned int serdev_device_set_baudrate(struct serdev_device *, unsigned int);
void serdev_device_set_flow_control(struct serdev_device *, bool);
int serdev_device_write_buf(struct serdev_device *, const u8 *, size_t);
void serdev_device_wait_until_sent(struct serdev_device *, long);
int serdev_device_get_tiocm(struct serdev_device *);
int serdev_device_set_tiocm(struct serdev_device *, int, int);
int serdev_device_break_ctl(struct serdev_device *serdev, int break_state);
void serdev_device_write_wakeup(struct serdev_device *);
ssize_t serdev_device_write(struct serdev_device *, const u8 *, size_t, long);
void serdev_device_write_flush(struct serdev_device *);
int serdev_device_write_room(struct serdev_device *);

/*
 * serdev device driver functions
 */
int __serdev_device_driver_register(struct serdev_device_driver *, struct module *);
#define serdev_device_driver_register(sdrv) …

/**
 * serdev_device_driver_unregister() - unregister an serdev client driver
 * @sdrv:	the driver to unregister
 */
static inline void serdev_device_driver_unregister(struct serdev_device_driver *sdrv)
{ … }

#define module_serdev_device_driver(__serdev_device_driver) …

#else

static inline int serdev_device_open(struct serdev_device *sdev)
{
	return -ENODEV;
}
static inline void serdev_device_close(struct serdev_device *sdev) {}
static inline unsigned int serdev_device_set_baudrate(struct serdev_device *sdev, unsigned int baudrate)
{
	return 0;
}
static inline void serdev_device_set_flow_control(struct serdev_device *sdev, bool enable) {}
static inline int serdev_device_write_buf(struct serdev_device *serdev,
					  const u8 *buf,
					  size_t count)
{
	return -ENODEV;
}
static inline void serdev_device_wait_until_sent(struct serdev_device *sdev, long timeout) {}
static inline int serdev_device_get_tiocm(struct serdev_device *serdev)
{
	return -EOPNOTSUPP;
}
static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear)
{
	return -EOPNOTSUPP;
}
static inline int serdev_device_break_ctl(struct serdev_device *serdev, int break_state)
{
	return -EOPNOTSUPP;
}
static inline ssize_t serdev_device_write(struct serdev_device *sdev,
					  const u8 *buf, size_t count,
					  unsigned long timeout)
{
	return -ENODEV;
}
static inline void serdev_device_write_flush(struct serdev_device *sdev) {}
static inline int serdev_device_write_room(struct serdev_device *sdev)
{
	return 0;
}

#define serdev_device_driver_register …
#define serdev_device_driver_unregister …

#endif /* CONFIG_SERIAL_DEV_BUS */

static inline bool serdev_device_get_cts(struct serdev_device *serdev)
{ … }

static inline int serdev_device_wait_for_cts(struct serdev_device *serdev, bool state, int timeout_ms)
{ … }

static inline int serdev_device_set_rts(struct serdev_device *serdev, bool enable)
{ … }

int serdev_device_set_parity(struct serdev_device *serdev,
			     enum serdev_parity parity);

/*
 * serdev hooks into TTY core
 */
struct tty_port;
struct tty_driver;

#ifdef CONFIG_SERIAL_DEV_CTRL_TTYPORT
struct device *serdev_tty_port_register(struct tty_port *port,
					struct device *host,
					struct device *parent,
					struct tty_driver *drv, int idx);
int serdev_tty_port_unregister(struct tty_port *port);
#else
static inline struct device *serdev_tty_port_register(struct tty_port *port,
					   struct device *host,
					   struct device *parent,
					   struct tty_driver *drv, int idx)
{
	return ERR_PTR(-ENODEV);
}
static inline int serdev_tty_port_unregister(struct tty_port *port)
{
	return -ENODEV;
}
#endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */

struct acpi_resource;
struct acpi_resource_uart_serialbus;

#ifdef CONFIG_ACPI
bool serdev_acpi_get_uart_resource(struct acpi_resource *ares,
				   struct acpi_resource_uart_serialbus **uart);
#else
static inline bool serdev_acpi_get_uart_resource(struct acpi_resource *ares,
						 struct acpi_resource_uart_serialbus **uart)
{
	return false;
}
#endif /* CONFIG_ACPI */

#endif /*_LINUX_SERDEV_H */