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/* SPDX-License-Identifier: MIT */
#ifndef DRM_MODULE_H
#define DRM_MODULE_H
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <drm/drm_drv.h>
/**
* DOC: overview
*
* This library provides helpers registering DRM drivers during module
* initialization and shutdown. The provided helpers act like bus-specific
* module helpers, such as module_pci_driver(), but respect additional
* parameters that control DRM driver registration.
*
* Below is an example of initializing a DRM driver for a device on the
* PCI bus.
*
* .. code-block:: c
*
* struct pci_driver my_pci_drv = {
* };
*
* drm_module_pci_driver(my_pci_drv);
*
* The generated code will test if DRM drivers are enabled and register
* the PCI driver my_pci_drv. For more complex module initialization, you
* can still use module_init() and module_exit() in your driver.
*/
/*
* PCI drivers
*/
static inline int __init drm_pci_register_driver(struct pci_driver *pci_drv)
{
if (drm_firmware_drivers_only())
return -ENODEV;
return pci_register_driver(pci_drv);
}
/**
* drm_module_pci_driver - Register a DRM driver for PCI-based devices
* @__pci_drv: the PCI driver structure
*
* Registers a DRM driver for devices on the PCI bus. The helper
* macro behaves like module_pci_driver() but tests the state of
* drm_firmware_drivers_only(). For more complex module initialization,
* use module_init() and module_exit() directly.
*
* Each module may only use this macro once. Calling it replaces
* module_init() and module_exit().
*/
#define drm_module_pci_driver(__pci_drv) \
module_driver(__pci_drv, drm_pci_register_driver, pci_unregister_driver)
static inline int __init
drm_pci_register_driver_if_modeset(struct pci_driver *pci_drv, int modeset)
{
if (drm_firmware_drivers_only() && modeset == -1)
return -ENODEV;
if (modeset == 0)
return -ENODEV;
return pci_register_driver(pci_drv);
}
static inline void __exit
drm_pci_unregister_driver_if_modeset(struct pci_driver *pci_drv, int modeset)
{
pci_unregister_driver(pci_drv);
}
/**
* drm_module_pci_driver_if_modeset - Register a DRM driver for PCI-based devices
* @__pci_drv: the PCI driver structure
* @__modeset: an additional parameter that disables the driver
*
* This macro is deprecated and only provided for existing drivers. For
* new drivers, use drm_module_pci_driver().
*
* Registers a DRM driver for devices on the PCI bus. The helper macro
* behaves like drm_module_pci_driver() with an additional driver-specific
* flag. If __modeset is 0, the driver has been disabled, if __modeset is
* -1 the driver state depends on the global DRM state. For all other
* values, the PCI driver has been enabled. The default should be -1.
*/
#define drm_module_pci_driver_if_modeset(__pci_drv, __modeset) \
module_driver(__pci_drv, drm_pci_register_driver_if_modeset, \
drm_pci_unregister_driver_if_modeset, __modeset)
/*
* Platform drivers
*/
static inline int __init
drm_platform_driver_register(struct platform_driver *platform_drv)
{
if (drm_firmware_drivers_only())
return -ENODEV;
return platform_driver_register(platform_drv);
}
/**
* drm_module_platform_driver - Register a DRM driver for platform devices
* @__platform_drv: the platform driver structure
*
* Registers a DRM driver for devices on the platform bus. The helper
* macro behaves like module_platform_driver() but tests the state of
* drm_firmware_drivers_only(). For more complex module initialization,
* use module_init() and module_exit() directly.
*
* Each module may only use this macro once. Calling it replaces
* module_init() and module_exit().
*/
#define drm_module_platform_driver(__platform_drv) \
module_driver(__platform_drv, drm_platform_driver_register, \
platform_driver_unregister)
#endif
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