forked from mirrors/linux
09f137c320
Provide a helper macro to register platform DRM drivers. The new macro behaves like module_platform_driver() with an additional test if DRM modesetting has been enabled. Signed-off-by: Javier Martinez Canillas <javierm@redhat.com> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> Link: https://patchwork.freedesktop.org/patch/msgid/20211222082831.196562-7-javierm@redhat.com
125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/* SPDX-License-Identifier: MIT */
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#ifndef DRM_MODULE_H
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#define DRM_MODULE_H
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <drm/drm_drv.h>
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/**
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* DOC: overview
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*
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* This library provides helpers registering DRM drivers during module
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* initialization and shutdown. The provided helpers act like bus-specific
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* module helpers, such as module_pci_driver(), but respect additional
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* parameters that control DRM driver registration.
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*
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* Below is an example of initializing a DRM driver for a device on the
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* PCI bus.
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*
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* .. code-block:: c
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*
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* struct pci_driver my_pci_drv = {
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* };
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*
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* drm_module_pci_driver(my_pci_drv);
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*
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* The generated code will test if DRM drivers are enabled and register
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* the PCI driver my_pci_drv. For more complex module initialization, you
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* can still use module_init() and module_exit() in your driver.
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*/
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/*
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* PCI drivers
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*/
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static inline int __init drm_pci_register_driver(struct pci_driver *pci_drv)
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{
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if (drm_firmware_drivers_only())
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return -ENODEV;
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return pci_register_driver(pci_drv);
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}
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/**
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* drm_module_pci_driver - Register a DRM driver for PCI-based devices
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* @__pci_drv: the PCI driver structure
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*
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* Registers a DRM driver for devices on the PCI bus. The helper
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* macro behaves like module_pci_driver() but tests the state of
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* drm_firmware_drivers_only(). For more complex module initialization,
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* use module_init() and module_exit() directly.
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*
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* Each module may only use this macro once. Calling it replaces
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* module_init() and module_exit().
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*/
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#define drm_module_pci_driver(__pci_drv) \
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module_driver(__pci_drv, drm_pci_register_driver, pci_unregister_driver)
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static inline int __init
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drm_pci_register_driver_if_modeset(struct pci_driver *pci_drv, int modeset)
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{
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if (drm_firmware_drivers_only() && modeset == -1)
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return -ENODEV;
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if (modeset == 0)
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return -ENODEV;
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return pci_register_driver(pci_drv);
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}
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static inline void __exit
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drm_pci_unregister_driver_if_modeset(struct pci_driver *pci_drv, int modeset)
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{
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pci_unregister_driver(pci_drv);
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}
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/**
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* drm_module_pci_driver_if_modeset - Register a DRM driver for PCI-based devices
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* @__pci_drv: the PCI driver structure
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* @__modeset: an additional parameter that disables the driver
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*
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* This macro is deprecated and only provided for existing drivers. For
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* new drivers, use drm_module_pci_driver().
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*
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* Registers a DRM driver for devices on the PCI bus. The helper macro
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* behaves like drm_module_pci_driver() with an additional driver-specific
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* flag. If __modeset is 0, the driver has been disabled, if __modeset is
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* -1 the driver state depends on the global DRM state. For all other
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* values, the PCI driver has been enabled. The default should be -1.
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*/
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#define drm_module_pci_driver_if_modeset(__pci_drv, __modeset) \
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module_driver(__pci_drv, drm_pci_register_driver_if_modeset, \
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drm_pci_unregister_driver_if_modeset, __modeset)
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/*
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* Platform drivers
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*/
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static inline int __init
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drm_platform_driver_register(struct platform_driver *platform_drv)
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{
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if (drm_firmware_drivers_only())
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return -ENODEV;
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return platform_driver_register(platform_drv);
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}
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/**
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* drm_module_platform_driver - Register a DRM driver for platform devices
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* @__platform_drv: the platform driver structure
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*
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* Registers a DRM driver for devices on the platform bus. The helper
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* macro behaves like module_platform_driver() but tests the state of
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* drm_firmware_drivers_only(). For more complex module initialization,
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* use module_init() and module_exit() directly.
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*
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* Each module may only use this macro once. Calling it replaces
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* module_init() and module_exit().
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*/
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#define drm_module_platform_driver(__platform_drv) \
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module_driver(__platform_drv, drm_platform_driver_register, \
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platform_driver_unregister)
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#endif
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