forked from mirrors/linux
0040a390d2
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>
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Counter interface enum functions
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* Copyright (C) 2018 William Breathitt Gray
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*/
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#ifndef _COUNTER_ENUM_H_
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#define _COUNTER_ENUM_H_
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#include <linux/types.h>
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struct counter_device;
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struct counter_signal;
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struct counter_count;
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ssize_t counter_signal_enum_read(struct counter_device *counter,
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struct counter_signal *signal, void *priv,
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char *buf);
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ssize_t counter_signal_enum_write(struct counter_device *counter,
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struct counter_signal *signal, void *priv,
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const char *buf, size_t len);
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ssize_t counter_signal_enum_available_read(struct counter_device *counter,
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struct counter_signal *signal,
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void *priv, char *buf);
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ssize_t counter_count_enum_read(struct counter_device *counter,
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struct counter_count *count, void *priv,
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char *buf);
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ssize_t counter_count_enum_write(struct counter_device *counter,
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struct counter_count *count, void *priv,
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const char *buf, size_t len);
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ssize_t counter_count_enum_available_read(struct counter_device *counter,
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struct counter_count *count,
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void *priv, char *buf);
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ssize_t counter_device_enum_read(struct counter_device *counter, void *priv,
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char *buf);
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ssize_t counter_device_enum_write(struct counter_device *counter, void *priv,
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const char *buf, size_t len);
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ssize_t counter_device_enum_available_read(struct counter_device *counter,
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void *priv, char *buf);
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#endif /* _COUNTER_ENUM_H_ */
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