1 files changed, 241 insertions, 0 deletions
diff --git a/include/linux/serdev.h b/include/linux/serdev.h
new file mode 100644
index 000000000000..3ac26c1a8aab
--- /dev/null
+++ b/include/linux/serdev.h
@@ -0,0 +1,241 @@
+/*
+ * 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>
+
+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.
+ */
+struct serdev_device {
+	struct device dev;
+	int nr;
+	struct serdev_controller *ctrl;
+	const struct serdev_device_ops *ops;
+};
+
+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);
+}
+
+/*
+ * 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);
+};
+
+/**
+ * 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);
+}
+
+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 *, 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(ctrl->serdev);
+}
+
+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(ctrl->serdev, data, count);
+}
+
+#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_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 *sdev, const unsigned char *buf, size_t count)
+{
+	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 */
+
+#endif /*_LINUX_SERDEV_H */