1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <drm/drm_drv.h>
4 #include <drm/drm_kunit_helpers.h>
5 #include <drm/drm_managed.h>
6 
7 #include <kunit/resource.h>
8 
9 #include <linux/device.h>
10 #include <linux/platform_device.h>
11 
12 #define KUNIT_DEVICE_NAME	"drm-kunit-mock-device"
13 
14 static const struct drm_mode_config_funcs drm_mode_config_funcs = {
15 };
16 
fake_probe(struct platform_device * pdev)17 static int fake_probe(struct platform_device *pdev)
18 {
19 	return 0;
20 }
21 
fake_remove(struct platform_device * pdev)22 static int fake_remove(struct platform_device *pdev)
23 {
24 	return 0;
25 }
26 
27 static struct platform_driver fake_platform_driver = {
28 	.probe	= fake_probe,
29 	.remove	= fake_remove,
30 	.driver = {
31 		.name	= KUNIT_DEVICE_NAME,
32 	},
33 };
34 
35 /**
36  * drm_kunit_helper_alloc_device - Allocate a mock device for a KUnit test
37  * @test: The test context object
38  *
39  * This allocates a fake struct &device to create a mock for a KUnit
40  * test. The device will also be bound to a fake driver. It will thus be
41  * able to leverage the usual infrastructure and most notably the
42  * device-managed resources just like a "real" device.
43  *
44  * Callers need to make sure drm_kunit_helper_free_device() on the
45  * device when done.
46  *
47  * Returns:
48  * A pointer to the new device, or an ERR_PTR() otherwise.
49  */
drm_kunit_helper_alloc_device(struct kunit * test)50 struct device *drm_kunit_helper_alloc_device(struct kunit *test)
51 {
52 	struct platform_device *pdev;
53 	int ret;
54 
55 	ret = platform_driver_register(&fake_platform_driver);
56 	KUNIT_ASSERT_EQ(test, ret, 0);
57 
58 	pdev = platform_device_alloc(KUNIT_DEVICE_NAME, PLATFORM_DEVID_NONE);
59 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
60 
61 	ret = platform_device_add(pdev);
62 	KUNIT_ASSERT_EQ(test, ret, 0);
63 
64 	return &pdev->dev;
65 }
66 EXPORT_SYMBOL_GPL(drm_kunit_helper_alloc_device);
67 
68 /**
69  * drm_kunit_helper_free_device - Frees a mock device
70  * @test: The test context object
71  * @dev: The device to free
72  *
73  * Frees a device allocated with drm_kunit_helper_alloc_device().
74  */
drm_kunit_helper_free_device(struct kunit * test,struct device * dev)75 void drm_kunit_helper_free_device(struct kunit *test, struct device *dev)
76 {
77 	struct platform_device *pdev = to_platform_device(dev);
78 
79 	platform_device_unregister(pdev);
80 	platform_driver_unregister(&fake_platform_driver);
81 }
82 EXPORT_SYMBOL_GPL(drm_kunit_helper_free_device);
83 
84 struct drm_device *
__drm_kunit_helper_alloc_drm_device_with_driver(struct kunit * test,struct device * dev,size_t size,size_t offset,const struct drm_driver * driver)85 __drm_kunit_helper_alloc_drm_device_with_driver(struct kunit *test,
86 						struct device *dev,
87 						size_t size, size_t offset,
88 						const struct drm_driver *driver)
89 {
90 	struct drm_device *drm;
91 	void *container;
92 	int ret;
93 
94 	container = __devm_drm_dev_alloc(dev, driver, size, offset);
95 	if (IS_ERR(container))
96 		return ERR_CAST(container);
97 
98 	drm = container + offset;
99 	drm->mode_config.funcs = &drm_mode_config_funcs;
100 
101 	ret = drmm_mode_config_init(drm);
102 	if (ret)
103 		return ERR_PTR(ret);
104 
105 	return drm;
106 }
107 EXPORT_SYMBOL_GPL(__drm_kunit_helper_alloc_drm_device_with_driver);
108 
109 MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
110 MODULE_LICENSE("GPL");
111