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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 | /* * Copyright (C) 2014 Google, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/delay.h> #include <linux/init.h> #include <linux/hrtimer.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/time.h> #define TEST_PROBE_DELAY (5 * 1000) /* 5 sec */ #define TEST_PROBE_THRESHOLD (TEST_PROBE_DELAY / 2) static int test_probe(struct platform_device *pdev) { dev_info(&pdev->dev, "sleeping for %d msecs in probe\n", TEST_PROBE_DELAY); msleep(TEST_PROBE_DELAY); dev_info(&pdev->dev, "done sleeping\n"); return 0; } static struct platform_driver async_driver = { .driver = { .name = "test_async_driver", .probe_type = PROBE_PREFER_ASYNCHRONOUS, }, .probe = test_probe, }; static struct platform_driver sync_driver = { .driver = { .name = "test_sync_driver", .probe_type = PROBE_FORCE_SYNCHRONOUS, }, .probe = test_probe, }; static struct platform_device *async_dev_1, *async_dev_2; static struct platform_device *sync_dev_1; static int __init test_async_probe_init(void) { ktime_t calltime, delta; unsigned long long duration; int error; pr_info("registering first asynchronous device...\n"); async_dev_1 = platform_device_register_simple("test_async_driver", 1, NULL, 0); if (IS_ERR(async_dev_1)) { error = PTR_ERR(async_dev_1); pr_err("failed to create async_dev_1: %d", error); return error; } pr_info("registering asynchronous driver...\n"); calltime = ktime_get(); error = platform_driver_register(&async_driver); if (error) { pr_err("Failed to register async_driver: %d\n", error); goto err_unregister_async_dev_1; } delta = ktime_sub(ktime_get(), calltime); duration = (unsigned long long) ktime_to_ms(delta); pr_info("registration took %lld msecs\n", duration); if (duration > TEST_PROBE_THRESHOLD) { pr_err("test failed: probe took too long\n"); error = -ETIMEDOUT; goto err_unregister_async_driver; } pr_info("registering second asynchronous device...\n"); calltime = ktime_get(); async_dev_2 = platform_device_register_simple("test_async_driver", 2, NULL, 0); if (IS_ERR(async_dev_2)) { error = PTR_ERR(async_dev_2); pr_err("failed to create async_dev_2: %d", error); goto err_unregister_async_driver; } delta = ktime_sub(ktime_get(), calltime); duration = (unsigned long long) ktime_to_ms(delta); pr_info("registration took %lld msecs\n", duration); if (duration > TEST_PROBE_THRESHOLD) { pr_err("test failed: probe took too long\n"); error = -ETIMEDOUT; goto err_unregister_async_dev_2; } pr_info("registering synchronous driver...\n"); error = platform_driver_register(&sync_driver); if (error) { pr_err("Failed to register async_driver: %d\n", error); goto err_unregister_async_dev_2; } pr_info("registering synchronous device...\n"); calltime = ktime_get(); sync_dev_1 = platform_device_register_simple("test_sync_driver", 1, NULL, 0); if (IS_ERR(sync_dev_1)) { error = PTR_ERR(sync_dev_1); pr_err("failed to create sync_dev_1: %d", error); goto err_unregister_sync_driver; } delta = ktime_sub(ktime_get(), calltime); duration = (unsigned long long) ktime_to_ms(delta); pr_info("registration took %lld msecs\n", duration); if (duration < TEST_PROBE_THRESHOLD) { pr_err("test failed: probe was too quick\n"); error = -ETIMEDOUT; goto err_unregister_sync_dev_1; } pr_info("completed successfully"); return 0; err_unregister_sync_dev_1: platform_device_unregister(sync_dev_1); err_unregister_sync_driver: platform_driver_unregister(&sync_driver); err_unregister_async_dev_2: platform_device_unregister(async_dev_2); err_unregister_async_driver: platform_driver_unregister(&async_driver); err_unregister_async_dev_1: platform_device_unregister(async_dev_1); return error; } module_init(test_async_probe_init); static void __exit test_async_probe_exit(void) { platform_driver_unregister(&async_driver); platform_driver_unregister(&sync_driver); platform_device_unregister(async_dev_1); platform_device_unregister(async_dev_2); platform_device_unregister(sync_dev_1); } module_exit(test_async_probe_exit); MODULE_DESCRIPTION("Test module for asynchronous driver probing"); MODULE_AUTHOR("Dmitry Torokhov <dtor@chromium.org>"); MODULE_LICENSE("GPL"); |