| 1 | /* |
| 2 | * wprobe-core.c: Wireless probe interface dummy driver |
| 3 | * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version 2 |
| 8 | * of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/version.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/random.h> |
| 22 | #include <linux/wprobe.h> |
| 23 | |
| 24 | static const char local_addr[] = "\x00\x13\x37\xba\xbe\x00"; |
| 25 | |
| 26 | enum dummy_global_values { |
| 27 | DUMMY_GLOBAL_MEDIUM_BUSY |
| 28 | }; |
| 29 | enum dummy_link_values { |
| 30 | DUMMY_LINK_SNR |
| 31 | }; |
| 32 | |
| 33 | struct wprobe_item dummy_perlink[] = { |
| 34 | [DUMMY_LINK_SNR] = { |
| 35 | .name = "snr", |
| 36 | .type = WPROBE_VAL_U8, |
| 37 | .flags = WPROBE_F_KEEPSTAT, |
| 38 | }, |
| 39 | }; |
| 40 | |
| 41 | struct wprobe_item dummy_globals[] = { |
| 42 | [DUMMY_GLOBAL_MEDIUM_BUSY] = { |
| 43 | .name = "medium_busy", |
| 44 | .type = WPROBE_VAL_U8, |
| 45 | .flags = WPROBE_F_KEEPSTAT, |
| 46 | } |
| 47 | }; |
| 48 | |
| 49 | int dummy_sync(struct wprobe_iface *dev, struct wprobe_link *l, struct wprobe_value *val, bool measure) |
| 50 | { |
| 51 | u8 intval = 0; |
| 52 | |
| 53 | get_random_bytes(&intval, 1); |
| 54 | if (l) { |
| 55 | WPROBE_FILL_BEGIN(val, dummy_perlink); |
| 56 | WPROBE_SET(DUMMY_LINK_SNR, U8, (intval % 40)); |
| 57 | WPROBE_FILL_END(); |
| 58 | } else { |
| 59 | WPROBE_FILL_BEGIN(val, dummy_globals); |
| 60 | WPROBE_SET(DUMMY_GLOBAL_MEDIUM_BUSY, U8, (intval % 100)); |
| 61 | WPROBE_FILL_END(); |
| 62 | } |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | static struct wprobe_iface dummy_dev = { |
| 67 | .name = "dummy", |
| 68 | .addr = local_addr, |
| 69 | .link_items = dummy_perlink, |
| 70 | .n_link_items = ARRAY_SIZE(dummy_perlink), |
| 71 | .global_items = dummy_globals, |
| 72 | .n_global_items = ARRAY_SIZE(dummy_globals), |
| 73 | .sync_data = dummy_sync, |
| 74 | }; |
| 75 | |
| 76 | static struct wprobe_link dummy_link; |
| 77 | |
| 78 | static int __init |
| 79 | wprobe_dummy_init(void) |
| 80 | { |
| 81 | wprobe_add_iface(&dummy_dev); |
| 82 | wprobe_add_link(&dummy_dev, &dummy_link, "\x00\x13\x37\xda\xda\x00"); |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static void __exit |
| 87 | wprobe_dummy_exit(void) |
| 88 | { |
| 89 | wprobe_remove_link(&dummy_dev, &dummy_link); |
| 90 | wprobe_remove_iface(&dummy_dev); |
| 91 | } |
| 92 | |
| 93 | module_init(wprobe_dummy_init); |
| 94 | module_exit(wprobe_dummy_exit); |
| 95 | |
| 96 | MODULE_LICENSE("GPL"); |
| 97 | |
