86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* Copyright 2021 Google Inc.
|
||
|
|
*
|
||
|
|
* The DP AUX bus is used for devices that are connected over a DisplayPort
|
||
|
|
* AUX bus. The devices on the far side of the bus are referred to as
|
||
|
|
* endpoints in this code.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _DP_AUX_BUS_H_
|
||
|
|
#define _DP_AUX_BUS_H_
|
||
|
|
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/mod_devicetable.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct dp_aux_ep_device - Main dev structure for DP AUX endpoints
|
||
|
|
*
|
||
|
|
* This is used to instantiate devices that are connected via a DP AUX
|
||
|
|
* bus. Usually the device is a panel, but conceivable other devices could
|
||
|
|
* be hooked up there.
|
||
|
|
*/
|
||
|
|
struct dp_aux_ep_device {
|
||
|
|
/** @dev: The normal dev pointer */
|
||
|
|
struct device dev;
|
||
|
|
/** @aux: Pointer to the aux bus */
|
||
|
|
struct drm_dp_aux *aux;
|
||
|
|
};
|
||
|
|
|
||
|
|
struct dp_aux_ep_driver {
|
||
|
|
int (*probe)(struct dp_aux_ep_device *aux_ep);
|
||
|
|
void (*remove)(struct dp_aux_ep_device *aux_ep);
|
||
|
|
void (*shutdown)(struct dp_aux_ep_device *aux_ep);
|
||
|
|
struct device_driver driver;
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline struct dp_aux_ep_device *to_dp_aux_ep_dev(struct device *dev)
|
||
|
|
{
|
||
|
|
return container_of(dev, struct dp_aux_ep_device, dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline struct dp_aux_ep_driver *to_dp_aux_ep_drv(struct device_driver *drv)
|
||
|
|
{
|
||
|
|
return container_of(drv, struct dp_aux_ep_driver, driver);
|
||
|
|
}
|
||
|
|
|
||
|
|
int of_dp_aux_populate_bus(struct drm_dp_aux *aux,
|
||
|
|
int (*done_probing)(struct drm_dp_aux *aux));
|
||
|
|
void of_dp_aux_depopulate_bus(struct drm_dp_aux *aux);
|
||
|
|
int devm_of_dp_aux_populate_bus(struct drm_dp_aux *aux,
|
||
|
|
int (*done_probing)(struct drm_dp_aux *aux));
|
||
|
|
|
||
|
|
/* Deprecated versions of the above functions. To be removed when no callers. */
|
||
|
|
static inline int of_dp_aux_populate_ep_devices(struct drm_dp_aux *aux)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = of_dp_aux_populate_bus(aux, NULL);
|
||
|
|
|
||
|
|
/* New API returns -ENODEV for no child case; adapt to old assumption */
|
||
|
|
return (ret != -ENODEV) ? ret : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline int devm_of_dp_aux_populate_ep_devices(struct drm_dp_aux *aux)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = devm_of_dp_aux_populate_bus(aux, NULL);
|
||
|
|
|
||
|
|
/* New API returns -ENODEV for no child case; adapt to old assumption */
|
||
|
|
return (ret != -ENODEV) ? ret : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void of_dp_aux_depopulate_ep_devices(struct drm_dp_aux *aux)
|
||
|
|
{
|
||
|
|
of_dp_aux_depopulate_bus(aux);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define dp_aux_dp_driver_register(aux_ep_drv) \
|
||
|
|
__dp_aux_dp_driver_register(aux_ep_drv, THIS_MODULE)
|
||
|
|
int __dp_aux_dp_driver_register(struct dp_aux_ep_driver *aux_ep_drv,
|
||
|
|
struct module *owner);
|
||
|
|
void dp_aux_dp_driver_unregister(struct dp_aux_ep_driver *aux_ep_drv);
|
||
|
|
|
||
|
|
#endif /* _DP_AUX_BUS_H_ */
|