323 lines
9.4 KiB
C
323 lines
9.4 KiB
C
/*
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* Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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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* @write_wakeup: Function called when ready to transmit more data.
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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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/*
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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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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 -EINVAL;
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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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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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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, unsigned 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 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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/*
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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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void 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 void serdev_tty_port_unregister(struct tty_port *port) {}
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#endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */
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static inline int serdev_device_write_buf(struct serdev_device *serdev,
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const unsigned char *data,
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size_t count)
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{
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return serdev_device_write(serdev, data, count, 0);
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}
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#endif /*_LINUX_SERDEV_H */
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