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>
This commit is contained in:
William Breathitt Gray
Greg Kroah-Hartman
parent
7df95299b9
commit
0040a390d2
@ -4054,6 +4054,14 @@ W: http://www.fi.muni.cz/~kas/cosa/
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S: Maintained
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F: drivers/net/wan/cosa*
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COUNTER SUBSYSTEM
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M: William Breathitt Gray <vilhelm.gray@gmail.com>
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L: linux-iio@vger.kernel.org
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S: Maintained
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F: drivers/counter/
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F: include/linux/counter.h
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F: include/linux/counter_enum.h
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CPMAC ETHERNET DRIVER
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M: Florian Fainelli <f.fainelli@gmail.com>
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L: netdev@vger.kernel.org
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@ -230,4 +230,6 @@ source "drivers/slimbus/Kconfig"
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source "drivers/interconnect/Kconfig"
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source "drivers/counter/Kconfig"
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endmenu
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@ -187,3 +187,4 @@ obj-$(CONFIG_UNISYS_VISORBUS) += visorbus/
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obj-$(CONFIG_SIOX) += siox/
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obj-$(CONFIG_GNSS) += gnss/
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obj-$(CONFIG_INTERCONNECT) += interconnect/
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obj-$(CONFIG_COUNTER) += counter/
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10
drivers/counter/Kconfig
Normal file
10
drivers/counter/Kconfig
Normal file
@ -0,0 +1,10 @@
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#
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# Counter devices
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#
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menuconfig COUNTER
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tristate "Counter support"
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help
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This enables counter device support through the Generic Counter
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interface. You only need to enable this, if you also want to enable
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one or more of the counter device drivers below.
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5
drivers/counter/Makefile
Normal file
5
drivers/counter/Makefile
Normal file
@ -0,0 +1,5 @@
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#
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# Makefile for Counter devices
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#
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obj-$(CONFIG_COUNTER) += counter.o
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1567
drivers/counter/counter.c
Normal file
1567
drivers/counter/counter.c
Normal file
File diff suppressed because it is too large
Load Diff
510
include/linux/counter.h
Normal file
510
include/linux/counter.h
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@ -0,0 +1,510 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Counter interface
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* Copyright (C) 2018 William Breathitt Gray
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*/
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#ifndef _COUNTER_H_
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#define _COUNTER_H_
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#include <linux/counter_enum.h>
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#include <linux/device.h>
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#include <linux/types.h>
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enum counter_count_direction {
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COUNTER_COUNT_DIRECTION_FORWARD = 0,
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COUNTER_COUNT_DIRECTION_BACKWARD
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};
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extern const char *const counter_count_direction_str[2];
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enum counter_count_mode {
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COUNTER_COUNT_MODE_NORMAL = 0,
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COUNTER_COUNT_MODE_RANGE_LIMIT,
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COUNTER_COUNT_MODE_NON_RECYCLE,
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COUNTER_COUNT_MODE_MODULO_N
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};
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extern const char *const counter_count_mode_str[4];
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struct counter_device;
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struct counter_signal;
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/**
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* struct counter_signal_ext - Counter Signal extensions
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* @name: attribute name
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* @read: read callback for this attribute; may be NULL
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* @write: write callback for this attribute; may be NULL
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* @priv: data private to the driver
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*/
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struct counter_signal_ext {
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const char *name;
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ssize_t (*read)(struct counter_device *counter,
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struct counter_signal *signal, void *priv, char *buf);
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ssize_t (*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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void *priv;
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};
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/**
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* struct counter_signal - Counter Signal node
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* @id: unique ID used to identify signal
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* @name: device-specific Signal name; ideally, this should match the name
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* as it appears in the datasheet documentation
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* @ext: optional array of Counter Signal extensions
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* @num_ext: number of Counter Signal extensions specified in @ext
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* @priv: optional private data supplied by driver
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*/
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struct counter_signal {
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int id;
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const char *name;
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const struct counter_signal_ext *ext;
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size_t num_ext;
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void *priv;
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};
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/**
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* struct counter_signal_enum_ext - Signal enum extension attribute
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* @items: Array of strings
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* @num_items: Number of items specified in @items
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* @set: Set callback function; may be NULL
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* @get: Get callback function; may be NULL
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*
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* The counter_signal_enum_ext structure can be used to implement enum style
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* Signal extension attributes. Enum style attributes are those which have a set
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* of strings that map to unsigned integer values. The Generic Counter Signal
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* enum extension helper code takes care of mapping between value and string, as
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* well as generating a "_available" file which contains a list of all available
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* items. The get callback is used to query the currently active item; the index
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* of the item within the respective items array is returned via the 'item'
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* parameter. The set callback is called when the attribute is updated; the
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* 'item' parameter contains the index of the newly activated item within the
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* respective items array.
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*/
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struct counter_signal_enum_ext {
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const char * const *items;
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size_t num_items;
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int (*get)(struct counter_device *counter,
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struct counter_signal *signal, size_t *item);
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int (*set)(struct counter_device *counter,
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struct counter_signal *signal, size_t item);
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};
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/**
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* COUNTER_SIGNAL_ENUM() - Initialize Signal enum extension
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* @_name: Attribute name
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* @_e: Pointer to a counter_signal_enum_ext structure
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*
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* This should usually be used together with COUNTER_SIGNAL_ENUM_AVAILABLE()
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*/
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#define COUNTER_SIGNAL_ENUM(_name, _e) \
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{ \
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.name = (_name), \
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.read = counter_signal_enum_read, \
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.write = counter_signal_enum_write, \
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.priv = (_e) \
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}
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/**
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* COUNTER_SIGNAL_ENUM_AVAILABLE() - Initialize Signal enum available extension
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* @_name: Attribute name ("_available" will be appended to the name)
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* @_e: Pointer to a counter_signal_enum_ext structure
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*
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* Creates a read only attribute that lists all the available enum items in a
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* newline separated list. This should usually be used together with
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* COUNTER_SIGNAL_ENUM()
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*/
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#define COUNTER_SIGNAL_ENUM_AVAILABLE(_name, _e) \
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{ \
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.name = (_name "_available"), \
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.read = counter_signal_enum_available_read, \
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.priv = (_e) \
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}
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enum counter_synapse_action {
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COUNTER_SYNAPSE_ACTION_NONE = 0,
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COUNTER_SYNAPSE_ACTION_RISING_EDGE,
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COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
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COUNTER_SYNAPSE_ACTION_BOTH_EDGES
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};
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/**
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* struct counter_synapse - Counter Synapse node
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* @action: index of current action mode
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* @actions_list: array of available action modes
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* @num_actions: number of action modes specified in @actions_list
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* @signal: pointer to associated signal
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*/
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struct counter_synapse {
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size_t action;
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const enum counter_synapse_action *actions_list;
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size_t num_actions;
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struct counter_signal *signal;
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};
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struct counter_count;
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/**
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* struct counter_count_ext - Counter Count extension
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* @name: attribute name
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* @read: read callback for this attribute; may be NULL
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* @write: write callback for this attribute; may be NULL
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* @priv: data private to the driver
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*/
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struct counter_count_ext {
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const char *name;
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ssize_t (*read)(struct counter_device *counter,
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struct counter_count *count, void *priv, char *buf);
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ssize_t (*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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void *priv;
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};
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enum counter_count_function {
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COUNTER_COUNT_FUNCTION_INCREASE = 0,
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COUNTER_COUNT_FUNCTION_DECREASE,
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COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
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COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A,
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COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B,
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COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
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COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B,
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COUNTER_COUNT_FUNCTION_QUADRATURE_X4
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};
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/**
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* struct counter_count - Counter Count node
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* @id: unique ID used to identify Count
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* @name: device-specific Count name; ideally, this should match
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* the name as it appears in the datasheet documentation
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* @function: index of current function mode
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* @functions_list: array available function modes
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* @num_functions: number of function modes specified in @functions_list
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* @synapses: array of synapses for initialization
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* @num_synapses: number of synapses specified in @synapses
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* @ext: optional array of Counter Count extensions
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* @num_ext: number of Counter Count extensions specified in @ext
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* @priv: optional private data supplied by driver
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*/
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struct counter_count {
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int id;
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const char *name;
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size_t function;
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const enum counter_count_function *functions_list;
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size_t num_functions;
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struct counter_synapse *synapses;
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size_t num_synapses;
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const struct counter_count_ext *ext;
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size_t num_ext;
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void *priv;
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};
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/**
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* struct counter_count_enum_ext - Count enum extension attribute
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* @items: Array of strings
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* @num_items: Number of items specified in @items
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* @set: Set callback function; may be NULL
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* @get: Get callback function; may be NULL
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*
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* The counter_count_enum_ext structure can be used to implement enum style
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* Count extension attributes. Enum style attributes are those which have a set
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* of strings that map to unsigned integer values. The Generic Counter Count
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* enum extension helper code takes care of mapping between value and string, as
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* well as generating a "_available" file which contains a list of all available
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* items. The get callback is used to query the currently active item; the index
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* of the item within the respective items array is returned via the 'item'
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* parameter. The set callback is called when the attribute is updated; the
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* 'item' parameter contains the index of the newly activated item within the
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* respective items array.
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*/
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struct counter_count_enum_ext {
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const char * const *items;
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size_t num_items;
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int (*get)(struct counter_device *counter, struct counter_count *count,
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size_t *item);
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int (*set)(struct counter_device *counter, struct counter_count *count,
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size_t item);
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};
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/**
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* COUNTER_COUNT_ENUM() - Initialize Count enum extension
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* @_name: Attribute name
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* @_e: Pointer to a counter_count_enum_ext structure
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*
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* This should usually be used together with COUNTER_COUNT_ENUM_AVAILABLE()
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*/
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#define COUNTER_COUNT_ENUM(_name, _e) \
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{ \
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.name = (_name), \
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.read = counter_count_enum_read, \
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.write = counter_count_enum_write, \
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.priv = (_e) \
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}
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/**
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* COUNTER_COUNT_ENUM_AVAILABLE() - Initialize Count enum available extension
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* @_name: Attribute name ("_available" will be appended to the name)
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* @_e: Pointer to a counter_count_enum_ext structure
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*
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* Creates a read only attribute that lists all the available enum items in a
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* newline separated list. This should usually be used together with
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* COUNTER_COUNT_ENUM()
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*/
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#define COUNTER_COUNT_ENUM_AVAILABLE(_name, _e) \
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{ \
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.name = (_name "_available"), \
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.read = counter_count_enum_available_read, \
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.priv = (_e) \
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}
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/**
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* struct counter_device_attr_group - internal container for attribute group
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* @attr_group: Counter sysfs attributes group
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* @attr_list: list to keep track of created Counter sysfs attributes
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* @num_attr: number of Counter sysfs attributes
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*/
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struct counter_device_attr_group {
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struct attribute_group attr_group;
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struct list_head attr_list;
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size_t num_attr;
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};
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/**
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* struct counter_device_state - internal state container for a Counter device
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* @id: unique ID used to identify the Counter
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* @dev: internal device structure
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* @groups_list: attribute groups list (for Signals, Counts, and ext)
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* @num_groups: number of attribute groups containers
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* @groups: Counter sysfs attribute groups (to populate @dev.groups)
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*/
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struct counter_device_state {
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int id;
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struct device dev;
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struct counter_device_attr_group *groups_list;
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size_t num_groups;
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const struct attribute_group **groups;
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};
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/**
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* struct counter_signal_read_value - Opaque Signal read value
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* @buf: string representation of Signal read value
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* @len: length of string in @buf
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*/
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struct counter_signal_read_value {
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char *buf;
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size_t len;
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};
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/**
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* struct counter_count_read_value - Opaque Count read value
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* @buf: string representation of Count read value
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* @len: length of string in @buf
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*/
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struct counter_count_read_value {
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char *buf;
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size_t len;
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};
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/**
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* struct counter_count_write_value - Opaque Count write value
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* @buf: string representation of Count write value
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*/
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struct counter_count_write_value {
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const char *buf;
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};
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/**
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* struct counter_ops - Callbacks from driver
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* @signal_read: optional read callback for Signal attribute. The read
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* value of the respective Signal should be passed back via
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* the val parameter. val points to an opaque type which
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* should be set only by calling the
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* counter_signal_read_value_set function from within the
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* signal_read callback.
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* @count_read: optional read callback for Count attribute. The read
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* value of the respective Count should be passed back via
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* the val parameter. val points to an opaque type which
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* should be set only by calling the
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* counter_count_read_value_set function from within the
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* count_read callback.
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* @count_write: optional write callback for Count attribute. The write
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* value for the respective Count is passed in via the val
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* parameter. val points to an opaque type which should be
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* accessed only by calling the
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* counter_count_write_value_get function.
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* @function_get: function to get the current count function mode. Returns
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* 0 on success and negative error code on error. The index
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* of the respective Count's returned function mode should
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* be passed back via the function parameter.
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* @function_set: function to set the count function mode. function is the
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* index of the requested function mode from the respective
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* Count's functions_list array.
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* @action_get: function to get the current action mode. Returns 0 on
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* success and negative error code on error. The index of
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* the respective Signal's returned action mode should be
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* passed back via the action parameter.
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* @action_set: function to set the action mode. action is the index of
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* the requested action mode from the respective Synapse's
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* actions_list array.
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*/
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struct counter_ops {
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int (*signal_read)(struct counter_device *counter,
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struct counter_signal *signal,
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struct counter_signal_read_value *val);
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int (*count_read)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_count_read_value *val);
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int (*count_write)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_count_write_value *val);
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int (*function_get)(struct counter_device *counter,
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struct counter_count *count, size_t *function);
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int (*function_set)(struct counter_device *counter,
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struct counter_count *count, size_t function);
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int (*action_get)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse, size_t *action);
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int (*action_set)(struct counter_device *counter,
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struct counter_count *count,
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struct counter_synapse *synapse, size_t action);
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};
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/**
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* struct counter_device_ext - Counter device extension
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* @name: attribute name
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* @read: read callback for this attribute; may be NULL
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* @write: write callback for this attribute; may be NULL
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* @priv: data private to the driver
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*/
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struct counter_device_ext {
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const char *name;
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ssize_t (*read)(struct counter_device *counter, void *priv, char *buf);
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ssize_t (*write)(struct counter_device *counter, void *priv,
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const char *buf, size_t len);
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void *priv;
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};
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/**
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* struct counter_device_enum_ext - Counter enum extension attribute
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* @items: Array of strings
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* @num_items: Number of items specified in @items
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||||
* @set: Set callback function; may be NULL
|
||||
* @get: Get callback function; may be NULL
|
||||
*
|
||||
* The counter_device_enum_ext structure can be used to implement enum style
|
||||
* Counter extension attributes. Enum style attributes are those which have a
|
||||
* set of strings that map to unsigned integer values. The Generic Counter enum
|
||||
* extension helper code takes care of mapping between value and string, as well
|
||||
* as generating a "_available" file which contains a list of all available
|
||||
* items. The get callback is used to query the currently active item; the index
|
||||
* of the item within the respective items array is returned via the 'item'
|
||||
* parameter. The set callback is called when the attribute is updated; the
|
||||
* 'item' parameter contains the index of the newly activated item within the
|
||||
* respective items array.
|
||||
*/
|
||||
struct counter_device_enum_ext {
|
||||
const char * const *items;
|
||||
size_t num_items;
|
||||
int (*get)(struct counter_device *counter, size_t *item);
|
||||
int (*set)(struct counter_device *counter, size_t item);
|
||||
};
|
||||
|
||||
/**
|
||||
* COUNTER_DEVICE_ENUM() - Initialize Counter enum extension
|
||||
* @_name: Attribute name
|
||||
* @_e: Pointer to a counter_device_enum_ext structure
|
||||
*
|
||||
* This should usually be used together with COUNTER_DEVICE_ENUM_AVAILABLE()
|
||||
*/
|
||||
#define COUNTER_DEVICE_ENUM(_name, _e) \
|
||||
{ \
|
||||
.name = (_name), \
|
||||
.read = counter_device_enum_read, \
|
||||
.write = counter_device_enum_write, \
|
||||
.priv = (_e) \
|
||||
}
|
||||
|
||||
/**
|
||||
* COUNTER_DEVICE_ENUM_AVAILABLE() - Initialize Counter enum available extension
|
||||
* @_name: Attribute name ("_available" will be appended to the name)
|
||||
* @_e: Pointer to a counter_device_enum_ext structure
|
||||
*
|
||||
* Creates a read only attribute that lists all the available enum items in a
|
||||
* newline separated list. This should usually be used together with
|
||||
* COUNTER_DEVICE_ENUM()
|
||||
*/
|
||||
#define COUNTER_DEVICE_ENUM_AVAILABLE(_name, _e) \
|
||||
{ \
|
||||
.name = (_name "_available"), \
|
||||
.read = counter_device_enum_available_read, \
|
||||
.priv = (_e) \
|
||||
}
|
||||
|
||||
/**
|
||||
* struct counter_device - Counter data structure
|
||||
* @name: name of the device as it appears in the datasheet
|
||||
* @parent: optional parent device providing the counters
|
||||
* @device_state: internal device state container
|
||||
* @ops: callbacks from driver
|
||||
* @signals: array of Signals
|
||||
* @num_signals: number of Signals specified in @signals
|
||||
* @counts: array of Counts
|
||||
* @num_counts: number of Counts specified in @counts
|
||||
* @ext: optional array of Counter device extensions
|
||||
* @num_ext: number of Counter device extensions specified in @ext
|
||||
* @priv: optional private data supplied by driver
|
||||
*/
|
||||
struct counter_device {
|
||||
const char *name;
|
||||
struct device *parent;
|
||||
struct counter_device_state *device_state;
|
||||
|
||||
const struct counter_ops *ops;
|
||||
|
||||
struct counter_signal *signals;
|
||||
size_t num_signals;
|
||||
struct counter_count *counts;
|
||||
size_t num_counts;
|
||||
|
||||
const struct counter_device_ext *ext;
|
||||
size_t num_ext;
|
||||
|
||||
void *priv;
|
||||
};
|
||||
|
||||
enum counter_signal_level {
|
||||
COUNTER_SIGNAL_LEVEL_LOW = 0,
|
||||
COUNTER_SIGNAL_LEVEL_HIGH
|
||||
};
|
||||
|
||||
enum counter_signal_value_type {
|
||||
COUNTER_SIGNAL_LEVEL = 0
|
||||
};
|
||||
|
||||
enum counter_count_value_type {
|
||||
COUNTER_COUNT_POSITION = 0,
|
||||
};
|
||||
|
||||
void counter_signal_read_value_set(struct counter_signal_read_value *const val,
|
||||
const enum counter_signal_value_type type,
|
||||
void *const data);
|
||||
void counter_count_read_value_set(struct counter_count_read_value *const val,
|
||||
const enum counter_count_value_type type,
|
||||
void *const data);
|
||||
int counter_count_write_value_get(void *const data,
|
||||
const enum counter_count_value_type type,
|
||||
const struct counter_count_write_value *const val);
|
||||
|
||||
int counter_register(struct counter_device *const counter);
|
||||
void counter_unregister(struct counter_device *const counter);
|
||||
int devm_counter_register(struct device *dev,
|
||||
struct counter_device *const counter);
|
||||
void devm_counter_unregister(struct device *dev,
|
||||
struct counter_device *const counter);
|
||||
|
||||
#endif /* _COUNTER_H_ */
|
||||
45
include/linux/counter_enum.h
Normal file
45
include/linux/counter_enum.h
Normal file
@ -0,0 +1,45 @@
|
||||
/* 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_ */
|
||||
Loading…
Reference in New Issue
Block a user