| 1 | /* |
| 2 | * Linux rfkill helper functions for driver wrappers |
| 3 | * Copyright (c) 2010, Jouni Malinen <j@w1.fi> |
| 4 | * |
| 5 | * This software may be distributed under the terms of the BSD license. |
| 6 | * See README for more details. |
| 7 | */ |
| 8 | |
| 9 | #include "includes.h" |
| 10 | #include <fcntl.h> |
| 11 | |
| 12 | #include "utils/common.h" |
| 13 | #include "utils/eloop.h" |
| 14 | #include "rfkill.h" |
| 15 | |
| 16 | #define RFKILL_EVENT_SIZE_V1 8 |
| 17 | |
| 18 | struct rfkill_event { |
| 19 | u32 idx; |
| 20 | u8 type; |
| 21 | u8 op; |
| 22 | u8 soft; |
| 23 | u8 hard; |
| 24 | } STRUCT_PACKED; |
| 25 | |
| 26 | enum rfkill_operation { |
| 27 | RFKILL_OP_ADD = 0, |
| 28 | RFKILL_OP_DEL, |
| 29 | RFKILL_OP_CHANGE, |
| 30 | RFKILL_OP_CHANGE_ALL, |
| 31 | }; |
| 32 | |
| 33 | enum rfkill_type { |
| 34 | RFKILL_TYPE_ALL = 0, |
| 35 | RFKILL_TYPE_WLAN, |
| 36 | RFKILL_TYPE_BLUETOOTH, |
| 37 | RFKILL_TYPE_UWB, |
| 38 | RFKILL_TYPE_WIMAX, |
| 39 | RFKILL_TYPE_WWAN, |
| 40 | RFKILL_TYPE_GPS, |
| 41 | RFKILL_TYPE_FM, |
| 42 | NUM_RFKILL_TYPES, |
| 43 | }; |
| 44 | |
| 45 | |
| 46 | struct rfkill_data { |
| 47 | struct rfkill_config *cfg; |
| 48 | int fd; |
| 49 | int blocked; |
| 50 | }; |
| 51 | |
| 52 | |
| 53 | static void rfkill_receive(int sock, void *eloop_ctx, void *sock_ctx) |
| 54 | { |
| 55 | struct rfkill_data *rfkill = eloop_ctx; |
| 56 | struct rfkill_event event; |
| 57 | ssize_t len; |
| 58 | int new_blocked; |
| 59 | |
| 60 | len = read(rfkill->fd, &event, sizeof(event)); |
| 61 | if (len < 0) { |
| 62 | wpa_printf(MSG_ERROR, "rfkill: Event read failed: %s", |
| 63 | strerror(errno)); |
| 64 | return; |
| 65 | } |
| 66 | if (len != RFKILL_EVENT_SIZE_V1) { |
| 67 | wpa_printf(MSG_DEBUG, "rfkill: Unexpected event size " |
| 68 | "%d (expected %d)", |
| 69 | (int) len, RFKILL_EVENT_SIZE_V1); |
| 70 | return; |
| 71 | } |
| 72 | wpa_printf(MSG_DEBUG, "rfkill: event: idx=%u type=%d " |
| 73 | "op=%u soft=%u hard=%u", |
| 74 | event.idx, event.type, event.op, event.soft, |
| 75 | event.hard); |
| 76 | if (event.op != RFKILL_OP_CHANGE || event.type != RFKILL_TYPE_WLAN) |
| 77 | return; |
| 78 | |
| 79 | if (event.hard) { |
| 80 | wpa_printf(MSG_INFO, "rfkill: WLAN hard blocked"); |
| 81 | new_blocked = 1; |
| 82 | } else if (event.soft) { |
| 83 | wpa_printf(MSG_INFO, "rfkill: WLAN soft blocked"); |
| 84 | new_blocked = 1; |
| 85 | } else { |
| 86 | wpa_printf(MSG_INFO, "rfkill: WLAN unblocked"); |
| 87 | new_blocked = 0; |
| 88 | } |
| 89 | |
| 90 | if (new_blocked != rfkill->blocked) { |
| 91 | rfkill->blocked = new_blocked; |
| 92 | if (new_blocked) |
| 93 | rfkill->cfg->blocked_cb(rfkill->cfg->ctx); |
| 94 | else |
| 95 | rfkill->cfg->unblocked_cb(rfkill->cfg->ctx); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | |
| 100 | struct rfkill_data * rfkill_init(struct rfkill_config *cfg) |
| 101 | { |
| 102 | struct rfkill_data *rfkill; |
| 103 | struct rfkill_event event; |
| 104 | ssize_t len; |
| 105 | |
| 106 | rfkill = os_zalloc(sizeof(*rfkill)); |
| 107 | if (rfkill == NULL) |
| 108 | return NULL; |
| 109 | |
| 110 | rfkill->cfg = cfg; |
| 111 | rfkill->fd = open("/dev/rfkill", O_RDONLY); |
| 112 | if (rfkill->fd < 0) { |
| 113 | wpa_printf(MSG_INFO, "rfkill: Cannot open RFKILL control " |
| 114 | "device"); |
| 115 | goto fail; |
| 116 | } |
| 117 | |
| 118 | if (fcntl(rfkill->fd, F_SETFL, O_NONBLOCK) < 0) { |
| 119 | wpa_printf(MSG_ERROR, "rfkill: Cannot set non-blocking mode: " |
| 120 | "%s", strerror(errno)); |
| 121 | goto fail2; |
| 122 | } |
| 123 | |
| 124 | for (;;) { |
| 125 | len = read(rfkill->fd, &event, sizeof(event)); |
| 126 | if (len < 0) { |
| 127 | if (errno == EAGAIN) |
| 128 | break; /* No more entries */ |
| 129 | wpa_printf(MSG_ERROR, "rfkill: Event read failed: %s", |
| 130 | strerror(errno)); |
| 131 | break; |
| 132 | } |
| 133 | if (len != RFKILL_EVENT_SIZE_V1) { |
| 134 | wpa_printf(MSG_DEBUG, "rfkill: Unexpected event size " |
| 135 | "%d (expected %d)", |
| 136 | (int) len, RFKILL_EVENT_SIZE_V1); |
| 137 | continue; |
| 138 | } |
| 139 | wpa_printf(MSG_DEBUG, "rfkill: initial event: idx=%u type=%d " |
| 140 | "op=%u soft=%u hard=%u", |
| 141 | event.idx, event.type, event.op, event.soft, |
| 142 | event.hard); |
| 143 | if (event.op != RFKILL_OP_ADD || |
| 144 | event.type != RFKILL_TYPE_WLAN) |
| 145 | continue; |
| 146 | if (event.hard) { |
| 147 | wpa_printf(MSG_INFO, "rfkill: WLAN hard blocked"); |
| 148 | rfkill->blocked = 1; |
| 149 | } else if (event.soft) { |
| 150 | wpa_printf(MSG_INFO, "rfkill: WLAN soft blocked"); |
| 151 | rfkill->blocked = 1; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | eloop_register_read_sock(rfkill->fd, rfkill_receive, rfkill, NULL); |
| 156 | |
| 157 | return rfkill; |
| 158 | |
| 159 | fail2: |
| 160 | close(rfkill->fd); |
| 161 | fail: |
| 162 | os_free(rfkill); |
| 163 | return NULL; |
| 164 | } |
| 165 | |
| 166 | |
| 167 | void rfkill_deinit(struct rfkill_data *rfkill) |
| 168 | { |
| 169 | if (rfkill == NULL) |
| 170 | return; |
| 171 | |
| 172 | if (rfkill->fd >= 0) { |
| 173 | eloop_unregister_read_sock(rfkill->fd); |
| 174 | close(rfkill->fd); |
| 175 | } |
| 176 | |
| 177 | os_free(rfkill->cfg); |
| 178 | os_free(rfkill); |
| 179 | } |
| 180 | |
| 181 | |
| 182 | int rfkill_is_blocked(struct rfkill_data *rfkill) |
| 183 | { |
| 184 | if (rfkill == NULL) |
| 185 | return 0; |
| 186 | |
| 187 | return rfkill->blocked; |
| 188 | } |