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/* 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_ */
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