redonkable/alistair23-linux
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alistair23-linux/include/linux/counter_enum.h

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counter: Introduce the Generic Counter interface This patch introduces the Generic Counter interface for supporting counter devices. In the context of the Generic Counter interface, a counter is defined as a device that reports one or more "counts" based on the state changes of one or more "signals" as evaluated by a defined "count function." Driver callbacks should be provided to communicate with the device: to read and write various Signals and Counts, and to set and get the "action mode" and "count function" for various Synapses and Counts respectively. To support a counter device, a driver must first allocate the available Counter Signals via counter_signal structures. These Signals should be stored as an array and set to the signals array member of an allocated counter_device structure before the Counter is registered to the system. Counter Counts may be allocated via counter_count structures, and respective Counter Signal associations (Synapses) made via counter_synapse structures. Associated counter_synapse structures are stored as an array and set to the the synapses array member of the respective counter_count structure. These counter_count structures are set to the counts array member of an allocated counter_device structure before the Counter is registered to the system. A counter device is registered to the system by passing the respective initialized counter_device structure to the counter_register function; similarly, the counter_unregister function unregisters the respective Counter. The devm_counter_register and devm_counter_unregister functions serve as device memory-managed versions of the counter_register and counter_unregister functions respectively. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-02 00:30:36 -06:00
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Counter interface enum functions
* Copyright (C) 2018 William Breathitt Gray
*/
#ifndef _COUNTER_ENUM_H_
#define _COUNTER_ENUM_H_
#include <linux/types.h>
struct counter_device;
struct counter_signal;
struct counter_count;
ssize_t counter_signal_enum_read(struct counter_device *counter,
struct counter_signal *signal, void *priv,
char *buf);
ssize_t counter_signal_enum_write(struct counter_device *counter,
struct counter_signal *signal, void *priv,
const char *buf, size_t len);
ssize_t counter_signal_enum_available_read(struct counter_device *counter,
struct counter_signal *signal,
void *priv, char *buf);
ssize_t counter_count_enum_read(struct counter_device *counter,
struct counter_count *count, void *priv,
char *buf);
ssize_t counter_count_enum_write(struct counter_device *counter,
struct counter_count *count, void *priv,
const char *buf, size_t len);
ssize_t counter_count_enum_available_read(struct counter_device *counter,
struct counter_count *count,
void *priv, char *buf);
ssize_t counter_device_enum_read(struct counter_device *counter, void *priv,
char *buf);
ssize_t counter_device_enum_write(struct counter_device *counter, void *priv,
const char *buf, size_t len);
ssize_t counter_device_enum_available_read(struct counter_device *counter,
void *priv, char *buf);
#endif /* _COUNTER_ENUM_H_ */
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