Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Dmitry Eremin-Solenikov | 562 | 99.82% | 3 | 75.00% |
Rob Herring | 1 | 0.18% | 1 | 25.00% |
Total | 563 | 4 |
// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2023 Linaro Ltd. * * Author: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> */ #include <linux/auxiliary_bus.h> #include <linux/module.h> #include <linux/of.h> #include <drm/drm_bridge.h> #include <drm/bridge/aux-bridge.h> static DEFINE_IDA(drm_aux_bridge_ida); static void drm_aux_bridge_release(struct device *dev) { struct auxiliary_device *adev = to_auxiliary_dev(dev); ida_free(&drm_aux_bridge_ida, adev->id); kfree(adev); } static void drm_aux_bridge_unregister_adev(void *_adev) { struct auxiliary_device *adev = _adev; auxiliary_device_delete(adev); auxiliary_device_uninit(adev); } /** * drm_aux_bridge_register - Create a simple bridge device to link the chain * @parent: device instance providing this bridge * * Creates a simple DRM bridge that doesn't implement any drm_bridge * operations. Such bridges merely fill a place in the bridge chain linking * surrounding DRM bridges. * * Return: zero on success, negative error code on failure */ int drm_aux_bridge_register(struct device *parent) { struct auxiliary_device *adev; int ret; adev = kzalloc(sizeof(*adev), GFP_KERNEL); if (!adev) return -ENOMEM; ret = ida_alloc(&drm_aux_bridge_ida, GFP_KERNEL); if (ret < 0) { kfree(adev); return ret; } adev->id = ret; adev->name = "aux_bridge"; adev->dev.parent = parent; adev->dev.of_node = of_node_get(parent->of_node); adev->dev.release = drm_aux_bridge_release; ret = auxiliary_device_init(adev); if (ret) { ida_free(&drm_aux_bridge_ida, adev->id); kfree(adev); return ret; } ret = auxiliary_device_add(adev); if (ret) { auxiliary_device_uninit(adev); return ret; } return devm_add_action_or_reset(parent, drm_aux_bridge_unregister_adev, adev); } EXPORT_SYMBOL_GPL(drm_aux_bridge_register); struct drm_aux_bridge_data { struct drm_bridge bridge; struct drm_bridge *next_bridge; struct device *dev; }; static int drm_aux_bridge_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) { struct drm_aux_bridge_data *data; if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) return -EINVAL; data = container_of(bridge, struct drm_aux_bridge_data, bridge); return drm_bridge_attach(bridge->encoder, data->next_bridge, bridge, DRM_BRIDGE_ATTACH_NO_CONNECTOR); } static const struct drm_bridge_funcs drm_aux_bridge_funcs = { .attach = drm_aux_bridge_attach, }; static int drm_aux_bridge_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id) { struct drm_aux_bridge_data *data; data = devm_kzalloc(&auxdev->dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; data->dev = &auxdev->dev; data->next_bridge = devm_drm_of_get_bridge(&auxdev->dev, auxdev->dev.of_node, 0, 0); if (IS_ERR(data->next_bridge)) return dev_err_probe(&auxdev->dev, PTR_ERR(data->next_bridge), "failed to acquire drm_bridge\n"); data->bridge.funcs = &drm_aux_bridge_funcs; data->bridge.of_node = data->dev->of_node; return devm_drm_bridge_add(data->dev, &data->bridge); } static const struct auxiliary_device_id drm_aux_bridge_table[] = { { .name = KBUILD_MODNAME ".aux_bridge" }, {}, }; MODULE_DEVICE_TABLE(auxiliary, drm_aux_bridge_table); static struct auxiliary_driver drm_aux_bridge_drv = { .name = "aux_bridge", .id_table = drm_aux_bridge_table, .probe = drm_aux_bridge_probe, }; module_auxiliary_driver(drm_aux_bridge_drv); MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>"); MODULE_DESCRIPTION("DRM transparent bridge"); MODULE_LICENSE("GPL");
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