linux/lib/kunit/platform.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Test managed platform driver
 */

#include <linux/completion.h>
#include <linux/device/bus.h>
#include <linux/device/driver.h>
#include <linux/platform_device.h>

#include <kunit/platform_device.h>
#include <kunit/resource.h>

struct kunit_platform_device_alloc_params { … };

static int kunit_platform_device_alloc_init(struct kunit_resource *res, void *context)
{ … }

static void kunit_platform_device_alloc_exit(struct kunit_resource *res)
{ … }

/**
 * kunit_platform_device_alloc() - Allocate a KUnit test managed platform device
 * @test: test context
 * @name: device name of platform device to alloc
 * @id: identifier of platform device to alloc.
 *
 * Allocate a test managed platform device. The device is put when the test completes.
 *
 * Return: Allocated platform device on success, NULL on failure.
 */
struct platform_device *
kunit_platform_device_alloc(struct kunit *test, const char *name, int id)
{ … }
EXPORT_SYMBOL_GPL(…);

static void kunit_platform_device_add_exit(struct kunit_resource *res)
{ … }

static bool
kunit_platform_device_alloc_match(struct kunit *test,
				  struct kunit_resource *res, void *match_data)
{ … }

KUNIT_DEFINE_ACTION_WRAPPER(platform_device_unregister_wrapper,
			    platform_device_unregister, struct platform_device *);
/**
 * kunit_platform_device_add() - Register a KUnit test managed platform device
 * @test: test context
 * @pdev: platform device to add
 *
 * Register a test managed platform device. The device is unregistered when the
 * test completes.
 *
 * Return: 0 on success, negative errno on failure.
 */
int kunit_platform_device_add(struct kunit *test, struct platform_device *pdev)
{ … }
EXPORT_SYMBOL_GPL(…);

struct kunit_platform_device_probe_nb { … };

static int kunit_platform_device_probe_notify(struct notifier_block *nb,
					      unsigned long event, void *data)
{ … }

static void kunit_platform_device_probe_nb_remove(void *nb)
{ … }

/**
 * kunit_platform_device_prepare_wait_for_probe() - Prepare a completion
 * variable to wait for a platform device to probe
 * @test: test context
 * @pdev: platform device to prepare to wait for probe of
 * @x: completion variable completed when @dev has probed
 *
 * Prepare a completion variable @x to wait for @pdev to probe. Waiting on the
 * completion forces a preemption, allowing the platform driver to probe.
 *
 * Example
 *
 * .. code-block:: c
 *
 *	static int kunit_platform_driver_probe(struct platform_device *pdev)
 *	{
 *		return 0;
 *	}
 *
 *	static void kunit_platform_driver_test(struct kunit *test)
 *	{
 *		struct platform_device *pdev;
 *		struct platform_driver *pdrv;
 *		DECLARE_COMPLETION_ONSTACK(comp);
 *
 *		pdev = kunit_platform_device_alloc(test, "kunit-platform", -1);
 *		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdev);
 *		KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_add(test, pdev));
 *
 *		pdrv = kunit_kzalloc(test, sizeof(*pdrv), GFP_KERNEL);
 *		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, pdrv);
 *
 *		pdrv->probe = kunit_platform_driver_probe;
 *		pdrv->driver.name = "kunit-platform";
 *		pdrv->driver.owner = THIS_MODULE;
 *
 *		KUNIT_ASSERT_EQ(test, 0, kunit_platform_device_prepare_wait_for_probe(test, pdev, &comp));
 *		KUNIT_ASSERT_EQ(test, 0, kunit_platform_driver_register(test, pdrv));
 *
 *		KUNIT_EXPECT_NE(test, 0, wait_for_completion_timeout(&comp, 3 * HZ));
 *	}
 *
 * Return: 0 on success, negative errno on failure.
 */
int kunit_platform_device_prepare_wait_for_probe(struct kunit *test,
						 struct platform_device *pdev,
						 struct completion *x)
{ … }
EXPORT_SYMBOL_GPL(…);

KUNIT_DEFINE_ACTION_WRAPPER(platform_driver_unregister_wrapper,
			    platform_driver_unregister, struct platform_driver *);
/**
 * kunit_platform_driver_register() - Register a KUnit test managed platform driver
 * @test: test context
 * @drv: platform driver to register
 *
 * Register a test managed platform driver. This allows callers to embed the
 * @drv in a container structure and use container_of() in the probe function
 * to pass information to KUnit tests.
 *
 * Example
 *
 * .. code-block:: c
 *
 *	struct kunit_test_context {
 *		struct platform_driver pdrv;
 *		const char *data;
 *	};
 *
 *	static inline struct kunit_test_context *
 *	to_test_context(struct platform_device *pdev)
 *	{
 *		return container_of(to_platform_driver(pdev->dev.driver),
 *				    struct kunit_test_context,
 *				    pdrv);
 *	}
 *
 *	static int kunit_platform_driver_probe(struct platform_device *pdev)
 *	{
 *		struct kunit_test_context *ctx;
 *
 *		ctx = to_test_context(pdev);
 *		ctx->data = "test data";
 *
 *		return 0;
 *	}
 *
 *	static void kunit_platform_driver_test(struct kunit *test)
 *	{
 *		struct kunit_test_context *ctx;
 *
 *		ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
 *		KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 *
 *		ctx->pdrv.probe = kunit_platform_driver_probe;
 *		ctx->pdrv.driver.name = "kunit-platform";
 *		ctx->pdrv.driver.owner = THIS_MODULE;
 *
 *		KUNIT_EXPECT_EQ(test, 0, kunit_platform_driver_register(test, &ctx->pdrv));
 *		<... wait for driver to probe ...>
 *		KUNIT_EXPECT_STREQ(test, ctx->data, "test data");
 *	}
 *
 * Return: 0 on success, negative errno on failure.
 */
int kunit_platform_driver_register(struct kunit *test,
				   struct platform_driver *drv)
{ … }
EXPORT_SYMBOL_GPL(…);