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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2016-2017 Linaro Ltd., Rob Herring <robh@kernel.org> */ #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 { size_t (*receive_buf)(struct serdev_device *, const u8 *, 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); } /** * 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); } enum serdev_parity { SERDEV_PARITY_NONE, SERDEV_PARITY_EVEN, SERDEV_PARITY_ODD, }; /* * serdev controller structures */ struct serdev_controller_ops { ssize_t (*write_buf)(struct serdev_controller *, const u8 *, 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); int (*set_parity)(struct serdev_controller *, enum serdev_parity); 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); int (*break_ctl)(struct serdev_controller *ctrl, unsigned int break_state); }; /** * 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 { struct device dev; struct device *host; 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); } static inline void *serdev_device_get_drvdata(const struct serdev_device *serdev) { return dev_get_drvdata(&serdev->dev); } static inline void serdev_device_set_drvdata(struct serdev_device *serdev, void *data) { dev_set_drvdata(&serdev->dev, data); } /** * 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); } static inline void serdev_device_set_client_ops(struct serdev_device *serdev, const struct serdev_device_ops *ops) { serdev->ops = ops; } static inline void *serdev_controller_get_drvdata(const struct serdev_controller *ctrl) { return ctrl ? dev_get_drvdata(&ctrl->dev) : NULL; } static inline void serdev_controller_set_drvdata(struct serdev_controller *ctrl, void *data) { dev_set_drvdata(&ctrl->dev, data); } /** * 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); } 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) { struct serdev_device *serdev = ctrl->serdev; if (!serdev || !serdev->ops->write_wakeup) return; serdev->ops->write_wakeup(serdev); } static inline size_t serdev_controller_receive_buf(struct serdev_controller *ctrl, const u8 *data, size_t count) { struct serdev_device *serdev = ctrl->serdev; if (!serdev || !serdev->ops->receive_buf) return 0; return serdev->ops->receive_buf(serdev, data, 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_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); } #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; } 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(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); } static inline int serdev_device_wait_for_cts(struct serdev_device *serdev, bool state, int timeout_ms) { bool signal; return readx_poll_timeout(serdev_device_get_cts, serdev, signal, signal == state, 2000, timeout_ms * 1000); } 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); } 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 */