97fb5e8d9b
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 and only version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 294 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.825281744@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
331 lines
9.5 KiB
C
331 lines
9.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
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*/
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#ifndef _LINUX_SERDEV_H
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#define _LINUX_SERDEV_H
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/termios.h>
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#include <linux/delay.h>
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struct serdev_controller;
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struct serdev_device;
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/*
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* serdev device structures
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*/
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/**
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* struct serdev_device_ops - Callback operations for a serdev device
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* @receive_buf: Function called with data received from device;
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* returns number of bytes accepted; may sleep.
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* @write_wakeup: Function called when ready to transmit more data; must
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* not sleep.
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*/
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struct serdev_device_ops {
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int (*receive_buf)(struct serdev_device *, const unsigned char *, size_t);
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void (*write_wakeup)(struct serdev_device *);
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};
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/**
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* struct serdev_device - Basic representation of an serdev device
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* @dev: Driver model representation of the device.
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* @nr: Device number on serdev bus.
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* @ctrl: serdev controller managing this device.
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* @ops: Device operations.
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* @write_comp Completion used by serdev_device_write() internally
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* @write_lock Lock to serialize access when writing data
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*/
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struct serdev_device {
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struct device dev;
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int nr;
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struct serdev_controller *ctrl;
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const struct serdev_device_ops *ops;
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struct completion write_comp;
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struct mutex write_lock;
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};
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static inline struct serdev_device *to_serdev_device(struct device *d)
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{
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return container_of(d, struct serdev_device, dev);
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}
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/**
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* struct serdev_device_driver - serdev slave device driver
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* @driver: serdev device drivers should initialize name field of this
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* structure.
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* @probe: binds this driver to a serdev device.
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* @remove: unbinds this driver from the serdev device.
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*/
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struct serdev_device_driver {
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struct device_driver driver;
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int (*probe)(struct serdev_device *);
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void (*remove)(struct serdev_device *);
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};
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static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d)
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{
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return container_of(d, struct serdev_device_driver, driver);
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}
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enum serdev_parity {
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SERDEV_PARITY_NONE,
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SERDEV_PARITY_EVEN,
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SERDEV_PARITY_ODD,
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};
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/*
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* serdev controller structures
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*/
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struct serdev_controller_ops {
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int (*write_buf)(struct serdev_controller *, const unsigned char *, size_t);
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void (*write_flush)(struct serdev_controller *);
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int (*write_room)(struct serdev_controller *);
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int (*open)(struct serdev_controller *);
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void (*close)(struct serdev_controller *);
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void (*set_flow_control)(struct serdev_controller *, bool);
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int (*set_parity)(struct serdev_controller *, enum serdev_parity);
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unsigned int (*set_baudrate)(struct serdev_controller *, unsigned int);
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void (*wait_until_sent)(struct serdev_controller *, long);
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int (*get_tiocm)(struct serdev_controller *);
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int (*set_tiocm)(struct serdev_controller *, unsigned int, unsigned int);
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};
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/**
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* struct serdev_controller - interface to the serdev controller
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* @dev: Driver model representation of the device.
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* @nr: number identifier for this controller/bus.
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* @serdev: Pointer to slave device for this controller.
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* @ops: Controller operations.
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*/
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struct serdev_controller {
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struct device dev;
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unsigned int nr;
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struct serdev_device *serdev;
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const struct serdev_controller_ops *ops;
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};
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static inline struct serdev_controller *to_serdev_controller(struct device *d)
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{
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return container_of(d, struct serdev_controller, dev);
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}
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static inline void *serdev_device_get_drvdata(const struct serdev_device *serdev)
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{
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return dev_get_drvdata(&serdev->dev);
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}
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static inline void serdev_device_set_drvdata(struct serdev_device *serdev, void *data)
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{
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dev_set_drvdata(&serdev->dev, data);
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}
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/**
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* serdev_device_put() - decrement serdev device refcount
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* @serdev serdev device.
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*/
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static inline void serdev_device_put(struct serdev_device *serdev)
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{
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if (serdev)
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put_device(&serdev->dev);
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}
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static inline void serdev_device_set_client_ops(struct serdev_device *serdev,
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const struct serdev_device_ops *ops)
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{
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serdev->ops = ops;
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}
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static inline
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void *serdev_controller_get_drvdata(const struct serdev_controller *ctrl)
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{
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return ctrl ? dev_get_drvdata(&ctrl->dev) : NULL;
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}
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static inline void serdev_controller_set_drvdata(struct serdev_controller *ctrl,
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void *data)
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{
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dev_set_drvdata(&ctrl->dev, data);
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}
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/**
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* serdev_controller_put() - decrement controller refcount
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* @ctrl serdev controller.
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*/
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static inline void serdev_controller_put(struct serdev_controller *ctrl)
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{
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if (ctrl)
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put_device(&ctrl->dev);
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}
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struct serdev_device *serdev_device_alloc(struct serdev_controller *);
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int serdev_device_add(struct serdev_device *);
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void serdev_device_remove(struct serdev_device *);
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struct serdev_controller *serdev_controller_alloc(struct device *, size_t);
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int serdev_controller_add(struct serdev_controller *);
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void serdev_controller_remove(struct serdev_controller *);
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static inline void serdev_controller_write_wakeup(struct serdev_controller *ctrl)
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{
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struct serdev_device *serdev = ctrl->serdev;
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if (!serdev || !serdev->ops->write_wakeup)
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return;
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serdev->ops->write_wakeup(serdev);
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}
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static inline int serdev_controller_receive_buf(struct serdev_controller *ctrl,
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const unsigned char *data,
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size_t count)
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{
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struct serdev_device *serdev = ctrl->serdev;
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if (!serdev || !serdev->ops->receive_buf)
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return 0;
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return serdev->ops->receive_buf(serdev, data, count);
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}
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#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS)
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int serdev_device_open(struct serdev_device *);
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void serdev_device_close(struct serdev_device *);
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int devm_serdev_device_open(struct device *, struct serdev_device *);
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unsigned int serdev_device_set_baudrate(struct serdev_device *, unsigned int);
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void serdev_device_set_flow_control(struct serdev_device *, bool);
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int serdev_device_write_buf(struct serdev_device *, const unsigned char *, size_t);
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void serdev_device_wait_until_sent(struct serdev_device *, long);
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int serdev_device_get_tiocm(struct serdev_device *);
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int serdev_device_set_tiocm(struct serdev_device *, int, int);
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void serdev_device_write_wakeup(struct serdev_device *);
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int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, long);
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void serdev_device_write_flush(struct serdev_device *);
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int serdev_device_write_room(struct serdev_device *);
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/*
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* serdev device driver functions
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*/
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int __serdev_device_driver_register(struct serdev_device_driver *, struct module *);
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#define serdev_device_driver_register(sdrv) \
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__serdev_device_driver_register(sdrv, THIS_MODULE)
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/**
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* serdev_device_driver_unregister() - unregister an serdev client driver
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* @sdrv: the driver to unregister
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*/
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static inline void serdev_device_driver_unregister(struct serdev_device_driver *sdrv)
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{
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if (sdrv)
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driver_unregister(&sdrv->driver);
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}
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#define module_serdev_device_driver(__serdev_device_driver) \
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module_driver(__serdev_device_driver, serdev_device_driver_register, \
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serdev_device_driver_unregister)
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#else
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static inline int serdev_device_open(struct serdev_device *sdev)
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{
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return -ENODEV;
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}
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static inline void serdev_device_close(struct serdev_device *sdev) {}
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static inline unsigned int serdev_device_set_baudrate(struct serdev_device *sdev, unsigned int baudrate)
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{
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return 0;
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}
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static inline void serdev_device_set_flow_control(struct serdev_device *sdev, bool enable) {}
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static inline int serdev_device_write_buf(struct serdev_device *serdev,
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const unsigned char *buf,
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size_t count)
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{
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return -ENODEV;
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}
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static inline void serdev_device_wait_until_sent(struct serdev_device *sdev, long timeout) {}
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static inline int serdev_device_get_tiocm(struct serdev_device *serdev)
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{
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return -ENOTSUPP;
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}
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static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear)
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{
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return -ENOTSUPP;
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}
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static inline int serdev_device_write(struct serdev_device *sdev, const unsigned char *buf,
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size_t count, unsigned long timeout)
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{
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return -ENODEV;
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}
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static inline void serdev_device_write_flush(struct serdev_device *sdev) {}
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static inline int serdev_device_write_room(struct serdev_device *sdev)
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{
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return 0;
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}
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#define serdev_device_driver_register(x)
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#define serdev_device_driver_unregister(x)
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#endif /* CONFIG_SERIAL_DEV_BUS */
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static inline bool serdev_device_get_cts(struct serdev_device *serdev)
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{
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int status = serdev_device_get_tiocm(serdev);
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return !!(status & TIOCM_CTS);
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}
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static inline int serdev_device_wait_for_cts(struct serdev_device *serdev, bool state, int timeout_ms)
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{
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unsigned long timeout;
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bool signal;
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timeout = jiffies + msecs_to_jiffies(timeout_ms);
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while (time_is_after_jiffies(timeout)) {
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signal = serdev_device_get_cts(serdev);
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if (signal == state)
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return 0;
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usleep_range(1000, 2000);
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}
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return -ETIMEDOUT;
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}
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static inline int serdev_device_set_rts(struct serdev_device *serdev, bool enable)
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{
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if (enable)
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return serdev_device_set_tiocm(serdev, TIOCM_RTS, 0);
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else
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return serdev_device_set_tiocm(serdev, 0, TIOCM_RTS);
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}
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int serdev_device_set_parity(struct serdev_device *serdev,
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enum serdev_parity parity);
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/*
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* serdev hooks into TTY core
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*/
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struct tty_port;
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struct tty_driver;
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#ifdef CONFIG_SERIAL_DEV_CTRL_TTYPORT
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struct device *serdev_tty_port_register(struct tty_port *port,
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struct device *parent,
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struct tty_driver *drv, int idx);
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int serdev_tty_port_unregister(struct tty_port *port);
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#else
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static inline struct device *serdev_tty_port_register(struct tty_port *port,
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struct device *parent,
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struct tty_driver *drv, int idx)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline int serdev_tty_port_unregister(struct tty_port *port)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */
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#endif /*_LINUX_SERDEV_H */
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