diff options
| author | William Breathitt Gray | 2019-04-02 15:30:36 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-04-25 21:33:37 +0200 |
| commit | 0040a390d2fde44a03b3a05cf0cdf3e692ece60f (patch) | |
| tree | 29901e0b8bc3a2e4387509bb35203b6f79f70f59 /drivers/counter/Makefile | |
| parent | 7df95299b94a63ec67a6389fc02dc25019a80ee8 (diff) | |
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>
Diffstat (limited to 'drivers/counter/Makefile')
| -rw-r--r-- | drivers/counter/Makefile | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile new file mode 100644 index 000000000000..b1464604bdbe --- /dev/null +++ b/drivers/counter/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for Counter devices +# + +obj-$(CONFIG_COUNTER) += counter.o |