106 lines
3 KiB
C
Executable file
106 lines
3 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* mux/driver.h - definitions for the multiplexer driver interface
|
|
*
|
|
* Copyright (C) 2017 Axentia Technologies AB
|
|
*
|
|
* Author: Peter Rosin <peda@axentia.se>
|
|
*/
|
|
|
|
#ifndef _LINUX_MUX_DRIVER_H
|
|
#define _LINUX_MUX_DRIVER_H
|
|
|
|
#include <dt-bindings/mux/mux.h>
|
|
#include <linux/device.h>
|
|
#include <linux/semaphore.h>
|
|
|
|
struct mux_chip;
|
|
struct mux_control;
|
|
|
|
/**
|
|
* struct mux_control_ops - Mux controller operations for a mux chip.
|
|
* @set: Set the state of the given mux controller.
|
|
*/
|
|
struct mux_control_ops {
|
|
int (*set)(struct mux_control *mux, int state);
|
|
};
|
|
|
|
/**
|
|
* struct mux_control - Represents a mux controller.
|
|
* @lock: Protects the mux controller state.
|
|
* @chip: The mux chip that is handling this mux controller.
|
|
* @cached_state: The current mux controller state, or -1 if none.
|
|
* @states: The number of mux controller states.
|
|
* @idle_state: The mux controller state to use when inactive, or one
|
|
* of MUX_IDLE_AS_IS and MUX_IDLE_DISCONNECT.
|
|
*
|
|
* Mux drivers may only change @states and @idle_state, and may only do so
|
|
* between allocation and registration of the mux controller. Specifically,
|
|
* @cached_state is internal to the mux core and should never be written by
|
|
* mux drivers.
|
|
*/
|
|
struct mux_control {
|
|
struct semaphore lock; /* protects the state of the mux */
|
|
|
|
struct mux_chip *chip;
|
|
int cached_state;
|
|
|
|
unsigned int states;
|
|
int idle_state;
|
|
};
|
|
|
|
/**
|
|
* struct mux_chip - Represents a chip holding mux controllers.
|
|
* @controllers: Number of mux controllers handled by the chip.
|
|
* @mux: Array of mux controllers that are handled.
|
|
* @dev: Device structure.
|
|
* @id: Used to identify the device internally.
|
|
* @ops: Mux controller operations.
|
|
*/
|
|
struct mux_chip {
|
|
unsigned int controllers;
|
|
struct mux_control *mux;
|
|
struct device dev;
|
|
int id;
|
|
|
|
const struct mux_control_ops *ops;
|
|
};
|
|
|
|
#define to_mux_chip(x) container_of((x), struct mux_chip, dev)
|
|
|
|
/**
|
|
* mux_chip_priv() - Get the extra memory reserved by mux_chip_alloc().
|
|
* @mux_chip: The mux-chip to get the private memory from.
|
|
*
|
|
* Return: Pointer to the private memory reserved by the allocator.
|
|
*/
|
|
static inline void *mux_chip_priv(struct mux_chip *mux_chip)
|
|
{
|
|
return &mux_chip->mux[mux_chip->controllers];
|
|
}
|
|
|
|
struct mux_chip *mux_chip_alloc(struct device *dev,
|
|
unsigned int controllers, size_t sizeof_priv);
|
|
int mux_chip_register(struct mux_chip *mux_chip);
|
|
void mux_chip_unregister(struct mux_chip *mux_chip);
|
|
void mux_chip_free(struct mux_chip *mux_chip);
|
|
|
|
struct mux_chip *devm_mux_chip_alloc(struct device *dev,
|
|
unsigned int controllers,
|
|
size_t sizeof_priv);
|
|
int devm_mux_chip_register(struct device *dev, struct mux_chip *mux_chip);
|
|
|
|
/**
|
|
* mux_control_get_index() - Get the index of the given mux controller
|
|
* @mux: The mux-control to get the index for.
|
|
*
|
|
* Return: The index of the mux controller within the mux chip the mux
|
|
* controller is a part of.
|
|
*/
|
|
static inline unsigned int mux_control_get_index(struct mux_control *mux)
|
|
{
|
|
return mux - mux->chip->mux;
|
|
}
|
|
|
|
#endif /* _LINUX_MUX_DRIVER_H */
|