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Input: add support for polling to input devices

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Separating "normal" and "polled" input devices was a mistake, as often we
want to allow the very same device work on both interrupt-driven and
polled mode, depending on the board on which the device is used.

This introduces new APIs:

- input_setup_polling
- input_set_poll_interval
- input_set_min_poll_interval
- input_set_max_poll_interval

These new APIs allow switching an input device into polled mode with sysfs
attributes matching drivers using input_polled_dev APIs that will be
eventually removed.

Tested-by: Michal Vokáč <michal.vokac@ysoft.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2017-04-18 17:28:30 -07:00
parent 2da9d2b5b9
commit e95656ea15
5 changed files with 273 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/linux/input.h
View file

@ -21,6 +21,8 @@
#include <linux/timer.h>
#include <linux/mod_devicetable.h>
struct input_dev_poller;
/**
* struct input_value - input value representation
* @type: type of value (EV_KEY, EV_ABS, etc)
@ -71,6 +73,8 @@ enum input_clock_type {
* not sleep
* @ff: force feedback structure associated with the device if device
* supports force feedback effects
* @poller: poller structure associated with the device if device is
* set up to use polling mode
* @repeat_key: stores key code of the last key pressed; used to implement
* software autorepeat
* @timer: timer for software autorepeat
@ -156,6 +160,8 @@ struct input_dev {
struct ff_device *ff;
struct input_dev_poller *poller;
unsigned int repeat_key;
struct timer_list timer;
@ -372,6 +378,12 @@ void input_unregister_device(struct input_dev *);
void input_reset_device(struct input_dev *);
int input_setup_polling(struct input_dev *dev,
void (*poll_fn)(struct input_dev *dev));
void input_set_poll_interval(struct input_dev *dev, unsigned int interval);
void input_set_min_poll_interval(struct input_dev *dev, unsigned int interval);
void input_set_max_poll_interval(struct input_dev *dev, unsigned int interval);
int __must_check input_register_handler(struct input_handler *);
void input_unregister_handler(struct input_handler *);