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ndg/lib/lv_drivers/indev/evdev.h

115 lines
2.7 KiB
C

/**
* @file evdev.h
*
*/
#ifndef EVDEV_H
#define EVDEV_H
#ifdef __cplusplus
extern "C" {
#endif
/*********************
* INCLUDES
*********************/
#ifndef LV_DRV_NO_CONF
#ifdef LV_CONF_INCLUDE_SIMPLE
#include "lv_drv_conf.h"
#else
#include "../../lv_drv_conf.h"
#endif
#endif
#if USE_EVDEV || USE_BSD_EVDEV
#ifdef LV_LVGL_H_INCLUDE_SIMPLE
#include "lvgl.h"
#else
#include "lvgl/lvgl.h"
#endif
/**********************
* TYPEDEFS
**********************/
typedef struct {
/*Device*/
int fd;
/*Config*/
bool swap_axes;
int ver_min;
int hor_min;
int ver_max;
int hor_max;
/*State*/
int root_x;
int root_y;
int key;
lv_indev_state_t state;
} evdev_device_t;
/**********************
* GLOBAL PROTOTYPES
**********************/
/**
* Initialize the global evdev device, as configured with EVDEV_NAME,
* EVDEV_SWAP_AXES, and EVDEV_CALIBRATE.
*/
void evdev_init();
/**
* Initialize an evdev device.
* @param dsc evdev device
*/
void evdev_device_init(evdev_device_t * dsc);
/**
* Reconfigure the path for the global evdev device.
* @param dev_path device path, e.g., /dev/input/event0, or NULL to close
* @return whether the device was successfully opened
*/
bool evdev_set_file(const char * dev_path);
/**
* Configure or reconfigure the path for an evdev device.
* @param dsc evdev device
* @param dev_path device path, e.g., /dev/input/event0, or NULL to close
* @return whether the device was successfully opened
*/
bool evdev_device_set_file(evdev_device_t * dsc, const char * dev_path);
/**
* Configure whether pointer coordinates of an evdev device sould be swapped.
* Default to false.
* @param dsc evdev device
* @param swap_axes whether to swap x and y axes
*/
void evdev_device_set_swap_axes(evdev_device_t * dsc, bool swap_axes);
/**
* Configure a coordinate transformation for an evdev device. Applied after
* axis swap, if any. Defaults to no transformation.
* @param dsc evdev device
* @param hor_min horizontal pointer coordinate mapped to 0
* @param ver_min vertical pointer coordinate mapped to 0
* @param ver_min pointer coordinate mapped to horizontal max of display
* @param ver_max pointer coordinate mapped to vertical max of display
*/
void evdev_device_set_calibration(evdev_device_t * dsc, int hor_min, int ver_min, int hor_max, int ver_max);
/**
* Read callback for the input driver.
* @param drv input driver where drv->user_data is NULL for the global evdev
* device or an evdev_device_t pointer.
* @param data destination for input events
*/
void evdev_read(lv_indev_drv_t * drv, lv_indev_data_t * data);
#endif /* USE_EVDEV */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* EVDEV_H */