cregit-Linux how code gets into the kernel

Release 4.12 include/linux/serdev.h

Directory: include/linux
/*
 * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org>
 *
 * 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.
 */
#ifndef _LINUX_SERDEV_H

#define _LINUX_SERDEV_H

#include <linux/types.h>
#include <linux/device.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.
 * @write_wakeup:       Function called when ready to transmit more data.
 */

struct serdev_device_ops {
	
int (*receive_buf)(struct serdev_device *, const unsigned char *, size_t);
	
void (*write_wakeup)(struct serdev_device *);
};

/**
 * 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 {
	
struct device dev;
	
int nr;
	
struct serdev_controller *ctrl;
	
const struct serdev_device_ops *ops;
	
struct completion write_comp;
	
struct mutex write_lock;
};


static inline struct serdev_device *to_serdev_device(struct device *d) { return container_of(d, struct serdev_device, dev); }

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/** * 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 { struct device_driver driver; int (*probe)(struct serdev_device *); void (*remove)(struct serdev_device *); };
static inline struct serdev_device_driver *to_serdev_device_driver(struct device_driver *d) { return container_of(d, struct serdev_device_driver, driver); }

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/* * serdev controller structures */ struct serdev_controller_ops { int (*write_buf)(struct serdev_controller *, const unsigned char *, size_t); void (*write_flush)(struct serdev_controller *); int (*write_room)(struct serdev_controller *); int (*open)(struct serdev_controller *); void (*close)(struct serdev_controller *); void (*set_flow_control)(struct serdev_controller *, bool); unsigned int (*set_baudrate)(struct serdev_controller *, unsigned int); void (*wait_until_sent)(struct serdev_controller *, long); int (*get_tiocm)(struct serdev_controller *); int (*set_tiocm)(struct serdev_controller *, unsigned int, unsigned int); }; /** * struct serdev_controller - interface to the serdev controller * @dev: Driver model representation of the device. * @nr: number identifier for this controller/bus. * @serdev: Pointer to slave device for this controller. * @ops: Controller operations. */ struct serdev_controller { struct device dev; unsigned int nr; struct serdev_device *serdev; const struct serdev_controller_ops *ops; };
static inline struct serdev_controller *to_serdev_controller(struct device *d) { return container_of(d, struct serdev_controller, dev); }

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static inline void *serdev_device_get_drvdata(const struct serdev_device *serdev) { return dev_get_drvdata(&serdev->dev); }

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static inline void serdev_device_set_drvdata(struct serdev_device *serdev, void *data) { dev_set_drvdata(&serdev->dev, data); }

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/** * serdev_device_put() - decrement serdev device refcount * @serdev serdev device. */
static inline void serdev_device_put(struct serdev_device *serdev) { if (serdev) put_device(&serdev->dev); }

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static inline void serdev_device_set_client_ops(struct serdev_device *serdev, const struct serdev_device_ops *ops) { serdev->ops = ops; }

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static inline void *serdev_controller_get_drvdata(const struct serdev_controller *ctrl) { return ctrl ? dev_get_drvdata(&ctrl->dev) : NULL; }

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static inline void serdev_controller_set_drvdata(struct serdev_controller *ctrl, void *data) { dev_set_drvdata(&ctrl->dev, data); }

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/** * serdev_controller_put() - decrement controller refcount * @ctrl serdev controller. */
static inline void serdev_controller_put(struct serdev_controller *ctrl) { if (ctrl) put_device(&ctrl->dev); }

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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 *, size_t); 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) { struct serdev_device *serdev = ctrl->serdev; if (!serdev || !serdev->ops->write_wakeup) return; serdev->ops->write_wakeup(serdev); }

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static inline int serdev_controller_receive_buf(struct serdev_controller *ctrl, const unsigned char *data, size_t count) { struct serdev_device *serdev = ctrl->serdev; if (!serdev || !serdev->ops->receive_buf) return -EINVAL; return serdev->ops->receive_buf(serdev, data, count); }

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#if IS_ENABLED(CONFIG_SERIAL_DEV_BUS) int serdev_device_open(struct serdev_device *); void serdev_device_close(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 unsigned char *, 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); void serdev_device_write_wakeup(struct serdev_device *); int serdev_device_write(struct serdev_device *, const unsigned char *, size_t, unsigned 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_register(sdrv, THIS_MODULE) /** * 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) { if (sdrv) driver_unregister(&sdrv->driver); }

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#define module_serdev_device_driver(__serdev_device_driver) \ module_driver(__serdev_device_driver, serdev_device_driver_register, \ serdev_device_driver_unregister) #else
static inline int serdev_device_open(struct serdev_device *sdev) { return -ENODEV; }

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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) { return 0; }

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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, const unsigned char *buf, size_t count) { return -ENODEV; }

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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) { return -ENOTSUPP; }

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static inline int serdev_device_set_tiocm(struct serdev_device *serdev, int set, int clear) { return -ENOTSUPP; }

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static inline int serdev_device_write(struct serdev_device *sdev, const unsigned char *buf, size_t count, unsigned long timeout) { return -ENODEV; }

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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) { return 0; }

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#define serdev_device_driver_register(x) #define serdev_device_driver_unregister(x) #endif /* CONFIG_SERIAL_DEV_BUS */
static inline bool serdev_device_get_cts(struct serdev_device *serdev) { int status = serdev_device_get_tiocm(serdev); return !!(status & TIOCM_CTS); }

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static inline int serdev_device_wait_for_cts(struct serdev_device *serdev, bool state, int timeout_ms) { unsigned long timeout; bool signal; timeout = jiffies + msecs_to_jiffies(timeout_ms); while (time_is_after_jiffies(timeout)) { signal = serdev_device_get_cts(serdev); if (signal == state) return 0; usleep_range(1000, 2000); } return -ETIMEDOUT; }

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static inline int serdev_device_set_rts(struct serdev_device *serdev, bool enable) { if (enable) return serdev_device_set_tiocm(serdev, TIOCM_RTS, 0); else return serdev_device_set_tiocm(serdev, 0, TIOCM_RTS); }

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/* * 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 *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 *parent, struct tty_driver *drv, int idx) { return ERR_PTR(-ENODEV); }

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static inline int serdev_tty_port_unregister(struct tty_port *port) { return -ENODEV; }

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#endif /* CONFIG_SERIAL_DEV_CTRL_TTYPORT */ #endif /*_LINUX_SERDEV_H */

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