1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright 2017 Ben Whitten <ben.whitten@gmail.com> 3 // Copyright 2007 Oliver Jowett <oliver@opencloud.com> 4 // 5 // LED Kernel Netdev Trigger 6 // 7 // Toggles the LED to reflect the link and traffic state of a named net device 8 // 9 // Derived from ledtrig-timer.c which is: 10 // Copyright 2005-2006 Openedhand Ltd. 11 // Author: Richard Purdie <rpurdie@openedhand.com> 12 13 #include <linux/atomic.h> 14 #include <linux/ctype.h> 15 #include <linux/device.h> 16 #include <linux/ethtool.h> 17 #include <linux/init.h> 18 #include <linux/jiffies.h> 19 #include <linux/kernel.h> 20 #include <linux/leds.h> 21 #include <linux/linkmode.h> 22 #include <linux/list.h> 23 #include <linux/module.h> 24 #include <linux/netdevice.h> 25 #include <linux/mutex.h> 26 #include <linux/phy.h> 27 #include <linux/rtnetlink.h> 28 #include <linux/timer.h> 29 #include <net/netdev_lock.h> 30 #include "../leds.h" 31 32 #define NETDEV_LED_DEFAULT_INTERVAL 50 33 34 /* 35 * Configurable sysfs attributes: 36 * 37 * device_name - network device name to monitor 38 * interval - duration of LED blink, in milliseconds 39 * link - LED's normal state reflects whether the link is up 40 * (has carrier) or not 41 * tx - LED blinks on transmitted data 42 * rx - LED blinks on receive data 43 * tx_err - LED blinks on transmit error 44 * rx_err - LED blinks on receive error 45 * 46 * Note: If the user selects a mode that is not supported by hw, default 47 * behavior is to fall back to software control of the LED. However not every 48 * hw supports software control. LED callbacks brightness_set() and 49 * brightness_set_blocking() are NULL in this case. hw_control_is_supported() 50 * should use available means supported by hw to inform the user that selected 51 * mode isn't supported by hw. This could be switching off the LED or any 52 * hw blink mode. If software control fallback isn't possible, we return 53 * -EOPNOTSUPP to the user, but still store the selected mode. This is needed 54 * in case an intermediate unsupported mode is necessary to switch from one 55 * supported mode to another. 56 */ 57 58 struct led_netdev_data { 59 struct mutex lock; 60 61 struct delayed_work work; 62 struct notifier_block notifier; 63 64 struct led_classdev *led_cdev; 65 struct net_device *net_dev; 66 67 char device_name[IFNAMSIZ]; 68 atomic_t interval; 69 unsigned int last_activity; 70 71 unsigned long mode; 72 int link_speed; 73 __ETHTOOL_DECLARE_LINK_MODE_MASK(supported_link_modes); 74 u8 duplex; 75 76 bool carrier_link_up; 77 bool hw_control; 78 }; 79 80 static const struct attribute_group netdev_trig_link_speed_attrs_group; 81 82 static void set_baseline_state(struct led_netdev_data *trigger_data) 83 { 84 int current_brightness; 85 struct led_classdev *led_cdev = trigger_data->led_cdev; 86 87 /* Already validated, hw control is possible with the requested mode */ 88 if (trigger_data->hw_control) { 89 led_cdev->hw_control_set(led_cdev, trigger_data->mode); 90 91 return; 92 } 93 94 current_brightness = led_cdev->brightness; 95 if (current_brightness) 96 led_cdev->blink_brightness = current_brightness; 97 if (!led_cdev->blink_brightness) 98 led_cdev->blink_brightness = led_cdev->max_brightness; 99 100 if (!trigger_data->carrier_link_up) { 101 led_set_brightness(led_cdev, LED_OFF); 102 } else { 103 bool blink_on = false; 104 105 if (test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode)) 106 blink_on = true; 107 108 if (test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) && 109 trigger_data->link_speed == SPEED_10) 110 blink_on = true; 111 112 if (test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) && 113 trigger_data->link_speed == SPEED_100) 114 blink_on = true; 115 116 if (test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) && 117 trigger_data->link_speed == SPEED_1000) 118 blink_on = true; 119 120 if (test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) && 121 trigger_data->link_speed == SPEED_2500) 122 blink_on = true; 123 124 if (test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) && 125 trigger_data->link_speed == SPEED_5000) 126 blink_on = true; 127 128 if (test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) && 129 trigger_data->link_speed == SPEED_10000) 130 blink_on = true; 131 132 if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) && 133 trigger_data->duplex == DUPLEX_HALF) 134 blink_on = true; 135 136 if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode) && 137 trigger_data->duplex == DUPLEX_FULL) 138 blink_on = true; 139 140 if (blink_on) 141 led_set_brightness(led_cdev, 142 led_cdev->blink_brightness); 143 else 144 led_set_brightness(led_cdev, LED_OFF); 145 146 /* If we are looking for RX/TX start periodically 147 * checking stats 148 */ 149 if (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) || 150 test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) || 151 test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) || 152 test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode)) 153 schedule_delayed_work(&trigger_data->work, 0); 154 } 155 } 156 157 static bool supports_hw_control(struct led_classdev *led_cdev) 158 { 159 if (!led_cdev->hw_control_get || !led_cdev->hw_control_set || 160 !led_cdev->hw_control_is_supported) 161 return false; 162 163 return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name); 164 } 165 166 /* 167 * Validate the configured netdev is the same as the one associated with 168 * the LED driver in hw control. 169 */ 170 static bool validate_net_dev(struct led_classdev *led_cdev, 171 struct net_device *net_dev) 172 { 173 struct device *dev = led_cdev->hw_control_get_device(led_cdev); 174 struct net_device *ndev; 175 176 if (!dev) 177 return false; 178 179 ndev = to_net_dev(dev); 180 181 return ndev == net_dev; 182 } 183 184 static bool can_hw_control(struct led_netdev_data *trigger_data) 185 { 186 unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL); 187 unsigned int interval = atomic_read(&trigger_data->interval); 188 struct led_classdev *led_cdev = trigger_data->led_cdev; 189 int ret; 190 191 if (!supports_hw_control(led_cdev)) 192 return false; 193 194 /* 195 * Interval must be set to the default 196 * value. Any different value is rejected if in hw 197 * control. 198 */ 199 if (interval != default_interval) 200 return false; 201 202 /* 203 * net_dev must be set with hw control, otherwise no 204 * blinking can be happening and there is nothing to 205 * offloaded. Additionally, for hw control to be 206 * valid, the configured netdev must be the same as 207 * netdev associated to the LED. 208 */ 209 if (!validate_net_dev(led_cdev, trigger_data->net_dev)) 210 return false; 211 212 /* Check if the requested mode is supported */ 213 ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode); 214 /* Fall back to software blinking if not supported */ 215 if (ret == -EOPNOTSUPP) 216 return false; 217 if (ret) { 218 dev_warn(led_cdev->dev, 219 "Current mode check failed with error %d\n", ret); 220 return false; 221 } 222 223 return true; 224 } 225 226 static void get_device_state(struct led_netdev_data *trigger_data) 227 { 228 struct ethtool_link_ksettings cmd; 229 230 trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev); 231 232 if (netif_get_link_ksettings(trigger_data->net_dev, &cmd)) 233 return; 234 235 if (trigger_data->carrier_link_up) { 236 trigger_data->link_speed = cmd.base.speed; 237 trigger_data->duplex = cmd.base.duplex; 238 } 239 240 /* 241 * Have a local copy of the link speed supported to avoid rtnl lock every time 242 * modes are refreshed on any change event 243 */ 244 linkmode_copy(trigger_data->supported_link_modes, cmd.link_modes.supported); 245 } 246 247 static ssize_t device_name_show(struct device *dev, 248 struct device_attribute *attr, char *buf) 249 { 250 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); 251 ssize_t len; 252 253 mutex_lock(&trigger_data->lock); 254 len = sprintf(buf, "%s\n", trigger_data->device_name); 255 mutex_unlock(&trigger_data->lock); 256 257 return len; 258 } 259 260 static int set_device_name(struct led_netdev_data *trigger_data, 261 const char *name, size_t size) 262 { 263 struct net_device *new_dev = NULL; 264 char device_name[IFNAMSIZ]; 265 266 if (size >= IFNAMSIZ) 267 return -EINVAL; 268 269 cancel_delayed_work_sync(&trigger_data->work); 270 271 memcpy(device_name, name, size); 272 device_name[size] = 0; 273 if (size > 0 && device_name[size - 1] == '\n') 274 device_name[size - 1] = 0; 275 276 /* 277 * Lock order: rtnl_lock -> netdev instance lock -> trigger_data lock. 278 */ 279 rtnl_lock(); 280 if (device_name[0]) { 281 new_dev = dev_get_by_name(&init_net, device_name); 282 if (new_dev) 283 netdev_lock_ops(new_dev); 284 } 285 mutex_lock(&trigger_data->lock); 286 287 dev_put(trigger_data->net_dev); 288 trigger_data->net_dev = new_dev; 289 strscpy(trigger_data->device_name, device_name); 290 291 trigger_data->carrier_link_up = false; 292 trigger_data->link_speed = SPEED_UNKNOWN; 293 trigger_data->duplex = DUPLEX_UNKNOWN; 294 if (trigger_data->net_dev) 295 get_device_state(trigger_data); 296 297 trigger_data->last_activity = 0; 298 299 /* Skip if we're called from netdev_trig_activate() and hw_control is true */ 300 if (!trigger_data->hw_control || led_get_trigger_data(trigger_data->led_cdev)) 301 set_baseline_state(trigger_data); 302 303 mutex_unlock(&trigger_data->lock); 304 if (new_dev) 305 netdev_unlock_ops(new_dev); 306 rtnl_unlock(); 307 308 return 0; 309 } 310 311 static ssize_t device_name_store(struct device *dev, 312 struct device_attribute *attr, const char *buf, 313 size_t size) 314 { 315 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); 316 int ret; 317 318 ret = set_device_name(trigger_data, buf, size); 319 320 if (ret < 0) 321 return ret; 322 323 /* Refresh link_speed visibility */ 324 sysfs_update_group(&dev->kobj, &netdev_trig_link_speed_attrs_group); 325 326 return size; 327 } 328 329 static DEVICE_ATTR_RW(device_name); 330 331 static ssize_t netdev_led_attr_show(struct device *dev, char *buf, 332 enum led_trigger_netdev_modes attr) 333 { 334 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); 335 int bit; 336 337 switch (attr) { 338 case TRIGGER_NETDEV_LINK: 339 case TRIGGER_NETDEV_LINK_10: 340 case TRIGGER_NETDEV_LINK_100: 341 case TRIGGER_NETDEV_LINK_1000: 342 case TRIGGER_NETDEV_LINK_2500: 343 case TRIGGER_NETDEV_LINK_5000: 344 case TRIGGER_NETDEV_LINK_10000: 345 case TRIGGER_NETDEV_HALF_DUPLEX: 346 case TRIGGER_NETDEV_FULL_DUPLEX: 347 case TRIGGER_NETDEV_TX: 348 case TRIGGER_NETDEV_RX: 349 case TRIGGER_NETDEV_TX_ERR: 350 case TRIGGER_NETDEV_RX_ERR: 351 bit = attr; 352 break; 353 default: 354 return -EINVAL; 355 } 356 357 return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode)); 358 } 359 360 static ssize_t netdev_led_attr_store(struct device *dev, const char *buf, 361 size_t size, enum led_trigger_netdev_modes attr) 362 { 363 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); 364 struct led_classdev *led_cdev = trigger_data->led_cdev; 365 unsigned long state, mode = trigger_data->mode; 366 int ret; 367 int bit; 368 369 ret = kstrtoul(buf, 0, &state); 370 if (ret) 371 return ret; 372 373 switch (attr) { 374 case TRIGGER_NETDEV_LINK: 375 case TRIGGER_NETDEV_LINK_10: 376 case TRIGGER_NETDEV_LINK_100: 377 case TRIGGER_NETDEV_LINK_1000: 378 case TRIGGER_NETDEV_LINK_2500: 379 case TRIGGER_NETDEV_LINK_5000: 380 case TRIGGER_NETDEV_LINK_10000: 381 case TRIGGER_NETDEV_HALF_DUPLEX: 382 case TRIGGER_NETDEV_FULL_DUPLEX: 383 case TRIGGER_NETDEV_TX: 384 case TRIGGER_NETDEV_RX: 385 case TRIGGER_NETDEV_TX_ERR: 386 case TRIGGER_NETDEV_RX_ERR: 387 bit = attr; 388 break; 389 default: 390 return -EINVAL; 391 } 392 393 if (state) 394 set_bit(bit, &mode); 395 else 396 clear_bit(bit, &mode); 397 398 if (test_bit(TRIGGER_NETDEV_LINK, &mode) && 399 (test_bit(TRIGGER_NETDEV_LINK_10, &mode) || 400 test_bit(TRIGGER_NETDEV_LINK_100, &mode) || 401 test_bit(TRIGGER_NETDEV_LINK_1000, &mode) || 402 test_bit(TRIGGER_NETDEV_LINK_2500, &mode) || 403 test_bit(TRIGGER_NETDEV_LINK_5000, &mode) || 404 test_bit(TRIGGER_NETDEV_LINK_10000, &mode))) 405 return -EINVAL; 406 407 cancel_delayed_work_sync(&trigger_data->work); 408 409 trigger_data->mode = mode; 410 trigger_data->hw_control = can_hw_control(trigger_data); 411 412 if (!led_cdev->brightness_set && !led_cdev->brightness_set_blocking && 413 !trigger_data->hw_control) 414 return -EOPNOTSUPP; 415 416 set_baseline_state(trigger_data); 417 418 return size; 419 } 420 421 #define DEFINE_NETDEV_TRIGGER(trigger_name, trigger) \ 422 static ssize_t trigger_name##_show(struct device *dev, \ 423 struct device_attribute *attr, char *buf) \ 424 { \ 425 return netdev_led_attr_show(dev, buf, trigger); \ 426 } \ 427 static ssize_t trigger_name##_store(struct device *dev, \ 428 struct device_attribute *attr, const char *buf, size_t size) \ 429 { \ 430 return netdev_led_attr_store(dev, buf, size, trigger); \ 431 } \ 432 static DEVICE_ATTR_RW(trigger_name) 433 434 DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK); 435 DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10); 436 DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100); 437 DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000); 438 DEFINE_NETDEV_TRIGGER(link_2500, TRIGGER_NETDEV_LINK_2500); 439 DEFINE_NETDEV_TRIGGER(link_5000, TRIGGER_NETDEV_LINK_5000); 440 DEFINE_NETDEV_TRIGGER(link_10000, TRIGGER_NETDEV_LINK_10000); 441 DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX); 442 DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX); 443 DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX); 444 DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX); 445 DEFINE_NETDEV_TRIGGER(tx_err, TRIGGER_NETDEV_TX_ERR); 446 DEFINE_NETDEV_TRIGGER(rx_err, TRIGGER_NETDEV_RX_ERR); 447 448 static ssize_t interval_show(struct device *dev, 449 struct device_attribute *attr, char *buf) 450 { 451 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); 452 453 return sprintf(buf, "%u\n", 454 jiffies_to_msecs(atomic_read(&trigger_data->interval))); 455 } 456 457 static ssize_t interval_store(struct device *dev, 458 struct device_attribute *attr, const char *buf, 459 size_t size) 460 { 461 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); 462 unsigned long value; 463 int ret; 464 465 if (trigger_data->hw_control) 466 return -EINVAL; 467 468 ret = kstrtoul(buf, 0, &value); 469 if (ret) 470 return ret; 471 472 /* impose some basic bounds on the timer interval */ 473 if (value >= 5 && value <= 10000) { 474 cancel_delayed_work_sync(&trigger_data->work); 475 476 atomic_set(&trigger_data->interval, msecs_to_jiffies(value)); 477 set_baseline_state(trigger_data); /* resets timer */ 478 } 479 480 return size; 481 } 482 483 static DEVICE_ATTR_RW(interval); 484 485 static ssize_t offloaded_show(struct device *dev, 486 struct device_attribute *attr, char *buf) 487 { 488 struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); 489 490 return sprintf(buf, "%d\n", trigger_data->hw_control); 491 } 492 493 static DEVICE_ATTR_RO(offloaded); 494 495 #define CHECK_LINK_MODE_ATTR(link_speed) \ 496 do { \ 497 if (attr == &dev_attr_link_##link_speed.attr && \ 498 link_ksettings.base.speed == SPEED_##link_speed) \ 499 return attr->mode; \ 500 } while (0) 501 502 static umode_t netdev_trig_link_speed_visible(struct kobject *kobj, 503 struct attribute *attr, int n) 504 { 505 struct device *dev = kobj_to_dev(kobj); 506 struct led_netdev_data *trigger_data; 507 unsigned long *supported_link_modes; 508 u32 mode; 509 510 trigger_data = led_trigger_get_drvdata(dev); 511 supported_link_modes = trigger_data->supported_link_modes; 512 513 /* 514 * Search in the supported link mode mask a matching supported mode. 515 * Stop at the first matching entry as we care only to check if a particular 516 * speed is supported and not the kind. 517 */ 518 for_each_set_bit(mode, supported_link_modes, __ETHTOOL_LINK_MODE_MASK_NBITS) { 519 struct ethtool_link_ksettings link_ksettings; 520 521 ethtool_params_from_link_mode(&link_ksettings, mode); 522 523 CHECK_LINK_MODE_ATTR(10); 524 CHECK_LINK_MODE_ATTR(100); 525 CHECK_LINK_MODE_ATTR(1000); 526 CHECK_LINK_MODE_ATTR(2500); 527 CHECK_LINK_MODE_ATTR(5000); 528 CHECK_LINK_MODE_ATTR(10000); 529 } 530 531 return 0; 532 } 533 534 static struct attribute *netdev_trig_link_speed_attrs[] = { 535 &dev_attr_link_10.attr, 536 &dev_attr_link_100.attr, 537 &dev_attr_link_1000.attr, 538 &dev_attr_link_2500.attr, 539 &dev_attr_link_5000.attr, 540 &dev_attr_link_10000.attr, 541 NULL 542 }; 543 544 static const struct attribute_group netdev_trig_link_speed_attrs_group = { 545 .attrs = netdev_trig_link_speed_attrs, 546 .is_visible = netdev_trig_link_speed_visible, 547 }; 548 549 static struct attribute *netdev_trig_attrs[] = { 550 &dev_attr_device_name.attr, 551 &dev_attr_link.attr, 552 &dev_attr_full_duplex.attr, 553 &dev_attr_half_duplex.attr, 554 &dev_attr_rx.attr, 555 &dev_attr_tx.attr, 556 &dev_attr_rx_err.attr, 557 &dev_attr_tx_err.attr, 558 &dev_attr_interval.attr, 559 &dev_attr_offloaded.attr, 560 NULL 561 }; 562 563 static const struct attribute_group netdev_trig_attrs_group = { 564 .attrs = netdev_trig_attrs, 565 }; 566 567 static const struct attribute_group *netdev_trig_groups[] = { 568 &netdev_trig_attrs_group, 569 &netdev_trig_link_speed_attrs_group, 570 NULL, 571 }; 572 573 static int netdev_trig_notify(struct notifier_block *nb, 574 unsigned long evt, void *dv) 575 { 576 struct net_device *dev = 577 netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv); 578 struct led_netdev_data *trigger_data = 579 container_of(nb, struct led_netdev_data, notifier); 580 struct led_classdev *led_cdev = trigger_data->led_cdev; 581 582 if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE 583 && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER 584 && evt != NETDEV_CHANGENAME) 585 return NOTIFY_DONE; 586 587 if (!(dev == trigger_data->net_dev || 588 (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) || 589 (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name)))) 590 return NOTIFY_DONE; 591 592 cancel_delayed_work_sync(&trigger_data->work); 593 594 mutex_lock(&trigger_data->lock); 595 596 trigger_data->carrier_link_up = false; 597 trigger_data->link_speed = SPEED_UNKNOWN; 598 trigger_data->duplex = DUPLEX_UNKNOWN; 599 switch (evt) { 600 case NETDEV_CHANGENAME: 601 case NETDEV_REGISTER: 602 dev_put(trigger_data->net_dev); 603 dev_hold(dev); 604 trigger_data->net_dev = dev; 605 if (evt == NETDEV_CHANGENAME) 606 get_device_state(trigger_data); 607 break; 608 case NETDEV_UNREGISTER: 609 dev_put(trigger_data->net_dev); 610 trigger_data->net_dev = NULL; 611 break; 612 case NETDEV_UP: 613 trigger_data->hw_control = can_hw_control(trigger_data); 614 fallthrough; 615 case NETDEV_CHANGE: 616 get_device_state(trigger_data); 617 /* Refresh link_speed visibility */ 618 if (evt == NETDEV_CHANGE) 619 sysfs_update_group(&led_cdev->dev->kobj, 620 &netdev_trig_link_speed_attrs_group); 621 break; 622 } 623 624 set_baseline_state(trigger_data); 625 626 mutex_unlock(&trigger_data->lock); 627 628 return NOTIFY_DONE; 629 } 630 631 /* here's the real work! */ 632 static void netdev_trig_work(struct work_struct *work) 633 { 634 struct led_netdev_data *trigger_data = 635 container_of(work, struct led_netdev_data, work.work); 636 struct rtnl_link_stats64 *dev_stats; 637 unsigned int new_activity; 638 struct rtnl_link_stats64 temp; 639 unsigned long interval; 640 int invert; 641 642 /* If we dont have a device, insure we are off */ 643 if (!trigger_data->net_dev) { 644 led_set_brightness(trigger_data->led_cdev, LED_OFF); 645 return; 646 } 647 648 /* If we are not looking for RX/TX then return */ 649 if (!test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) && 650 !test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) && 651 !test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) && 652 !test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode)) 653 return; 654 655 dev_stats = dev_get_stats(trigger_data->net_dev, &temp); 656 new_activity = 657 (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ? 658 dev_stats->tx_packets : 0) + 659 (test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ? 660 dev_stats->rx_packets : 0) + 661 (test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) ? 662 dev_stats->tx_errors : 0) + 663 (test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode) ? 664 dev_stats->rx_errors : 0); 665 666 if (trigger_data->last_activity != new_activity) { 667 led_stop_software_blink(trigger_data->led_cdev); 668 669 invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode) || 670 test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) || 671 test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) || 672 test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) || 673 test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) || 674 test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) || 675 test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) || 676 test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) || 677 test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode); 678 interval = jiffies_to_msecs( 679 atomic_read(&trigger_data->interval)); 680 /* base state is ON (link present) */ 681 led_blink_set_oneshot(trigger_data->led_cdev, 682 &interval, 683 &interval, 684 invert); 685 trigger_data->last_activity = new_activity; 686 } 687 688 schedule_delayed_work(&trigger_data->work, 689 (atomic_read(&trigger_data->interval)*2)); 690 } 691 692 static int netdev_trig_activate(struct led_classdev *led_cdev) 693 { 694 struct led_netdev_data *trigger_data; 695 unsigned long mode = 0; 696 struct device *dev; 697 int rc; 698 699 trigger_data = kzalloc_obj(struct led_netdev_data); 700 if (!trigger_data) 701 return -ENOMEM; 702 703 mutex_init(&trigger_data->lock); 704 705 trigger_data->notifier.notifier_call = netdev_trig_notify; 706 trigger_data->notifier.priority = 10; 707 708 INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work); 709 710 trigger_data->led_cdev = led_cdev; 711 trigger_data->net_dev = NULL; 712 trigger_data->device_name[0] = 0; 713 714 trigger_data->mode = 0; 715 atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL)); 716 trigger_data->last_activity = 0; 717 718 /* Check if hw control is active by default on the LED. 719 * Init already enabled mode in hw control. 720 */ 721 if (supports_hw_control(led_cdev)) { 722 dev = led_cdev->hw_control_get_device(led_cdev); 723 if (dev) { 724 const char *name = dev_name(dev); 725 726 trigger_data->hw_control = true; 727 set_device_name(trigger_data, name, strlen(name)); 728 729 rc = led_cdev->hw_control_get(led_cdev, &mode); 730 if (!rc) 731 trigger_data->mode = mode; 732 } 733 } 734 735 led_set_trigger_data(led_cdev, trigger_data); 736 737 rc = register_netdevice_notifier(&trigger_data->notifier); 738 if (rc) 739 kfree(trigger_data); 740 741 return rc; 742 } 743 744 static void netdev_trig_deactivate(struct led_classdev *led_cdev) 745 { 746 struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev); 747 748 unregister_netdevice_notifier(&trigger_data->notifier); 749 750 cancel_delayed_work_sync(&trigger_data->work); 751 752 dev_put(trigger_data->net_dev); 753 754 kfree(trigger_data); 755 } 756 757 static struct led_trigger netdev_led_trigger = { 758 .name = "netdev", 759 .activate = netdev_trig_activate, 760 .deactivate = netdev_trig_deactivate, 761 .groups = netdev_trig_groups, 762 }; 763 764 module_led_trigger(netdev_led_trigger); 765 766 MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>"); 767 MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>"); 768 MODULE_DESCRIPTION("Netdev LED trigger"); 769 MODULE_LICENSE("GPL v2"); 770 MODULE_ALIAS("ledtrig:netdev"); 771