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