| // SPDX-License-Identifier: GPL-2.0 |
| // Copyright 2017 Ben Whitten <[email protected]> |
| // Copyright 2007 Oliver Jowett <[email protected]> |
| // |
| // LED Kernel Netdev Trigger |
| // |
| // Toggles the LED to reflect the link and traffic state of a named net device |
| // |
| // Derived from ledtrig-timer.c which is: |
| // Copyright 2005-2006 Openedhand Ltd. |
| // Author: Richard Purdie <[email protected]> |
| |
| #include <linux/atomic.h> |
| #include <linux/ctype.h> |
| #include <linux/device.h> |
| #include <linux/ethtool.h> |
| #include <linux/init.h> |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/leds.h> |
| #include <linux/linkmode.h> |
| #include <linux/list.h> |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/mutex.h> |
| #include <linux/phy.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/timer.h> |
| #include "../leds.h" |
| |
| #define NETDEV_LED_DEFAULT_INTERVAL 50 |
| |
| /* |
| * Configurable sysfs attributes: |
| * |
| * device_name - network device name to monitor |
| * interval - duration of LED blink, in milliseconds |
| * link - LED's normal state reflects whether the link is up |
| * (has carrier) or not |
| * tx - LED blinks on transmitted data |
| * rx - LED blinks on receive data |
| * tx_err - LED blinks on transmit error |
| * rx_err - LED blinks on receive error |
| * |
| * Note: If the user selects a mode that is not supported by hw, default |
| * behavior is to fall back to software control of the LED. However not every |
| * hw supports software control. LED callbacks brightness_set() and |
| * brightness_set_blocking() are NULL in this case. hw_control_is_supported() |
| * should use available means supported by hw to inform the user that selected |
| * mode isn't supported by hw. This could be switching off the LED or any |
| * hw blink mode. If software control fallback isn't possible, we return |
| * -EOPNOTSUPP to the user, but still store the selected mode. This is needed |
| * in case an intermediate unsupported mode is necessary to switch from one |
| * supported mode to another. |
| */ |
| |
| struct led_netdev_data { |
| struct mutex lock; |
| |
| struct delayed_work work; |
| struct notifier_block notifier; |
| |
| struct led_classdev *led_cdev; |
| struct net_device *net_dev; |
| |
| char device_name[IFNAMSIZ]; |
| atomic_t interval; |
| unsigned int last_activity; |
| |
| unsigned long mode; |
| int link_speed; |
| __ETHTOOL_DECLARE_LINK_MODE_MASK(supported_link_modes); |
| u8 duplex; |
| |
| bool carrier_link_up; |
| bool hw_control; |
| }; |
| |
| static const struct attribute_group netdev_trig_link_speed_attrs_group; |
| |
| static void set_baseline_state(struct led_netdev_data *trigger_data) |
| { |
| int current_brightness; |
| struct led_classdev *led_cdev = trigger_data->led_cdev; |
| |
| /* Already validated, hw control is possible with the requested mode */ |
| if (trigger_data->hw_control) { |
| led_cdev->hw_control_set(led_cdev, trigger_data->mode); |
| |
| return; |
| } |
| |
| current_brightness = led_cdev->brightness; |
| if (current_brightness) |
| led_cdev->blink_brightness = current_brightness; |
| if (!led_cdev->blink_brightness) |
| led_cdev->blink_brightness = led_cdev->max_brightness; |
| |
| if (!trigger_data->carrier_link_up) { |
| led_set_brightness(led_cdev, LED_OFF); |
| } else { |
| bool blink_on = false; |
| |
| if (test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode)) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) && |
| trigger_data->link_speed == SPEED_10) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) && |
| trigger_data->link_speed == SPEED_100) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) && |
| trigger_data->link_speed == SPEED_1000) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) && |
| trigger_data->link_speed == SPEED_2500) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) && |
| trigger_data->link_speed == SPEED_5000) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) && |
| trigger_data->link_speed == SPEED_10000) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) && |
| trigger_data->duplex == DUPLEX_HALF) |
| blink_on = true; |
| |
| if (test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode) && |
| trigger_data->duplex == DUPLEX_FULL) |
| blink_on = true; |
| |
| if (blink_on) |
| led_set_brightness(led_cdev, |
| led_cdev->blink_brightness); |
| else |
| led_set_brightness(led_cdev, LED_OFF); |
| |
| /* If we are looking for RX/TX start periodically |
| * checking stats |
| */ |
| if (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode)) |
| schedule_delayed_work(&trigger_data->work, 0); |
| } |
| } |
| |
| static bool supports_hw_control(struct led_classdev *led_cdev) |
| { |
| if (!led_cdev->hw_control_get || !led_cdev->hw_control_set || |
| !led_cdev->hw_control_is_supported) |
| return false; |
| |
| return !strcmp(led_cdev->hw_control_trigger, led_cdev->trigger->name); |
| } |
| |
| /* |
| * Validate the configured netdev is the same as the one associated with |
| * the LED driver in hw control. |
| */ |
| static bool validate_net_dev(struct led_classdev *led_cdev, |
| struct net_device *net_dev) |
| { |
| struct device *dev = led_cdev->hw_control_get_device(led_cdev); |
| struct net_device *ndev; |
| |
| if (!dev) |
| return false; |
| |
| ndev = to_net_dev(dev); |
| |
| return ndev == net_dev; |
| } |
| |
| static bool can_hw_control(struct led_netdev_data *trigger_data) |
| { |
| unsigned long default_interval = msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL); |
| unsigned int interval = atomic_read(&trigger_data->interval); |
| struct led_classdev *led_cdev = trigger_data->led_cdev; |
| int ret; |
| |
| if (!supports_hw_control(led_cdev)) |
| return false; |
| |
| /* |
| * Interval must be set to the default |
| * value. Any different value is rejected if in hw |
| * control. |
| */ |
| if (interval != default_interval) |
| return false; |
| |
| /* |
| * net_dev must be set with hw control, otherwise no |
| * blinking can be happening and there is nothing to |
| * offloaded. Additionally, for hw control to be |
| * valid, the configured netdev must be the same as |
| * netdev associated to the LED. |
| */ |
| if (!validate_net_dev(led_cdev, trigger_data->net_dev)) |
| return false; |
| |
| /* Check if the requested mode is supported */ |
| ret = led_cdev->hw_control_is_supported(led_cdev, trigger_data->mode); |
| /* Fall back to software blinking if not supported */ |
| if (ret == -EOPNOTSUPP) |
| return false; |
| if (ret) { |
| dev_warn(led_cdev->dev, |
| "Current mode check failed with error %d\n", ret); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static void get_device_state(struct led_netdev_data *trigger_data) |
| { |
| struct ethtool_link_ksettings cmd; |
| |
| trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev); |
| |
| if (__ethtool_get_link_ksettings(trigger_data->net_dev, &cmd)) |
| return; |
| |
| if (trigger_data->carrier_link_up) { |
| trigger_data->link_speed = cmd.base.speed; |
| trigger_data->duplex = cmd.base.duplex; |
| } |
| |
| /* |
| * Have a local copy of the link speed supported to avoid rtnl lock every time |
| * modes are refreshed on any change event |
| */ |
| linkmode_copy(trigger_data->supported_link_modes, cmd.link_modes.supported); |
| } |
| |
| static ssize_t device_name_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); |
| ssize_t len; |
| |
| mutex_lock(&trigger_data->lock); |
| len = sprintf(buf, "%s\n", trigger_data->device_name); |
| mutex_unlock(&trigger_data->lock); |
| |
| return len; |
| } |
| |
| static int set_device_name(struct led_netdev_data *trigger_data, |
| const char *name, size_t size) |
| { |
| if (size >= IFNAMSIZ) |
| return -EINVAL; |
| |
| cancel_delayed_work_sync(&trigger_data->work); |
| |
| /* |
| * Take RTNL lock before trigger_data lock to prevent potential |
| * deadlock with netdev notifier registration. |
| */ |
| rtnl_lock(); |
| mutex_lock(&trigger_data->lock); |
| |
| if (trigger_data->net_dev) { |
| dev_put(trigger_data->net_dev); |
| trigger_data->net_dev = NULL; |
| } |
| |
| memcpy(trigger_data->device_name, name, size); |
| trigger_data->device_name[size] = 0; |
| if (size > 0 && trigger_data->device_name[size - 1] == '\n') |
| trigger_data->device_name[size - 1] = 0; |
| |
| if (trigger_data->device_name[0] != 0) |
| trigger_data->net_dev = |
| dev_get_by_name(&init_net, trigger_data->device_name); |
| |
| trigger_data->carrier_link_up = false; |
| trigger_data->link_speed = SPEED_UNKNOWN; |
| trigger_data->duplex = DUPLEX_UNKNOWN; |
| if (trigger_data->net_dev) |
| get_device_state(trigger_data); |
| |
| trigger_data->last_activity = 0; |
| |
| /* Skip if we're called from netdev_trig_activate() and hw_control is true */ |
| if (!trigger_data->hw_control || led_get_trigger_data(trigger_data->led_cdev)) |
| set_baseline_state(trigger_data); |
| |
| mutex_unlock(&trigger_data->lock); |
| rtnl_unlock(); |
| |
| return 0; |
| } |
| |
| static ssize_t device_name_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, |
| size_t size) |
| { |
| struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); |
| int ret; |
| |
| ret = set_device_name(trigger_data, buf, size); |
| |
| if (ret < 0) |
| return ret; |
| |
| /* Refresh link_speed visibility */ |
| sysfs_update_group(&dev->kobj, &netdev_trig_link_speed_attrs_group); |
| |
| return size; |
| } |
| |
| static DEVICE_ATTR_RW(device_name); |
| |
| static ssize_t netdev_led_attr_show(struct device *dev, char *buf, |
| enum led_trigger_netdev_modes attr) |
| { |
| struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); |
| int bit; |
| |
| switch (attr) { |
| case TRIGGER_NETDEV_LINK: |
| case TRIGGER_NETDEV_LINK_10: |
| case TRIGGER_NETDEV_LINK_100: |
| case TRIGGER_NETDEV_LINK_1000: |
| case TRIGGER_NETDEV_LINK_2500: |
| case TRIGGER_NETDEV_LINK_5000: |
| case TRIGGER_NETDEV_LINK_10000: |
| case TRIGGER_NETDEV_HALF_DUPLEX: |
| case TRIGGER_NETDEV_FULL_DUPLEX: |
| case TRIGGER_NETDEV_TX: |
| case TRIGGER_NETDEV_RX: |
| case TRIGGER_NETDEV_TX_ERR: |
| case TRIGGER_NETDEV_RX_ERR: |
| bit = attr; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return sprintf(buf, "%u\n", test_bit(bit, &trigger_data->mode)); |
| } |
| |
| static ssize_t netdev_led_attr_store(struct device *dev, const char *buf, |
| size_t size, enum led_trigger_netdev_modes attr) |
| { |
| struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); |
| struct led_classdev *led_cdev = trigger_data->led_cdev; |
| unsigned long state, mode = trigger_data->mode; |
| int ret; |
| int bit; |
| |
| ret = kstrtoul(buf, 0, &state); |
| if (ret) |
| return ret; |
| |
| switch (attr) { |
| case TRIGGER_NETDEV_LINK: |
| case TRIGGER_NETDEV_LINK_10: |
| case TRIGGER_NETDEV_LINK_100: |
| case TRIGGER_NETDEV_LINK_1000: |
| case TRIGGER_NETDEV_LINK_2500: |
| case TRIGGER_NETDEV_LINK_5000: |
| case TRIGGER_NETDEV_LINK_10000: |
| case TRIGGER_NETDEV_HALF_DUPLEX: |
| case TRIGGER_NETDEV_FULL_DUPLEX: |
| case TRIGGER_NETDEV_TX: |
| case TRIGGER_NETDEV_RX: |
| case TRIGGER_NETDEV_TX_ERR: |
| case TRIGGER_NETDEV_RX_ERR: |
| bit = attr; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (state) |
| set_bit(bit, &mode); |
| else |
| clear_bit(bit, &mode); |
| |
| if (test_bit(TRIGGER_NETDEV_LINK, &mode) && |
| (test_bit(TRIGGER_NETDEV_LINK_10, &mode) || |
| test_bit(TRIGGER_NETDEV_LINK_100, &mode) || |
| test_bit(TRIGGER_NETDEV_LINK_1000, &mode) || |
| test_bit(TRIGGER_NETDEV_LINK_2500, &mode) || |
| test_bit(TRIGGER_NETDEV_LINK_5000, &mode) || |
| test_bit(TRIGGER_NETDEV_LINK_10000, &mode))) |
| return -EINVAL; |
| |
| cancel_delayed_work_sync(&trigger_data->work); |
| |
| trigger_data->mode = mode; |
| trigger_data->hw_control = can_hw_control(trigger_data); |
| |
| if (!led_cdev->brightness_set && !led_cdev->brightness_set_blocking && |
| !trigger_data->hw_control) |
| return -EOPNOTSUPP; |
| |
| set_baseline_state(trigger_data); |
| |
| return size; |
| } |
| |
| #define DEFINE_NETDEV_TRIGGER(trigger_name, trigger) \ |
| static ssize_t trigger_name##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| return netdev_led_attr_show(dev, buf, trigger); \ |
| } \ |
| static ssize_t trigger_name##_store(struct device *dev, \ |
| struct device_attribute *attr, const char *buf, size_t size) \ |
| { \ |
| return netdev_led_attr_store(dev, buf, size, trigger); \ |
| } \ |
| static DEVICE_ATTR_RW(trigger_name) |
| |
| DEFINE_NETDEV_TRIGGER(link, TRIGGER_NETDEV_LINK); |
| DEFINE_NETDEV_TRIGGER(link_10, TRIGGER_NETDEV_LINK_10); |
| DEFINE_NETDEV_TRIGGER(link_100, TRIGGER_NETDEV_LINK_100); |
| DEFINE_NETDEV_TRIGGER(link_1000, TRIGGER_NETDEV_LINK_1000); |
| DEFINE_NETDEV_TRIGGER(link_2500, TRIGGER_NETDEV_LINK_2500); |
| DEFINE_NETDEV_TRIGGER(link_5000, TRIGGER_NETDEV_LINK_5000); |
| DEFINE_NETDEV_TRIGGER(link_10000, TRIGGER_NETDEV_LINK_10000); |
| DEFINE_NETDEV_TRIGGER(half_duplex, TRIGGER_NETDEV_HALF_DUPLEX); |
| DEFINE_NETDEV_TRIGGER(full_duplex, TRIGGER_NETDEV_FULL_DUPLEX); |
| DEFINE_NETDEV_TRIGGER(tx, TRIGGER_NETDEV_TX); |
| DEFINE_NETDEV_TRIGGER(rx, TRIGGER_NETDEV_RX); |
| DEFINE_NETDEV_TRIGGER(tx_err, TRIGGER_NETDEV_TX_ERR); |
| DEFINE_NETDEV_TRIGGER(rx_err, TRIGGER_NETDEV_RX_ERR); |
| |
| static ssize_t interval_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); |
| |
| return sprintf(buf, "%u\n", |
| jiffies_to_msecs(atomic_read(&trigger_data->interval))); |
| } |
| |
| static ssize_t interval_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, |
| size_t size) |
| { |
| struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); |
| unsigned long value; |
| int ret; |
| |
| if (trigger_data->hw_control) |
| return -EINVAL; |
| |
| ret = kstrtoul(buf, 0, &value); |
| if (ret) |
| return ret; |
| |
| /* impose some basic bounds on the timer interval */ |
| if (value >= 5 && value <= 10000) { |
| cancel_delayed_work_sync(&trigger_data->work); |
| |
| atomic_set(&trigger_data->interval, msecs_to_jiffies(value)); |
| set_baseline_state(trigger_data); /* resets timer */ |
| } |
| |
| return size; |
| } |
| |
| static DEVICE_ATTR_RW(interval); |
| |
| static ssize_t offloaded_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev); |
| |
| return sprintf(buf, "%d\n", trigger_data->hw_control); |
| } |
| |
| static DEVICE_ATTR_RO(offloaded); |
| |
| #define CHECK_LINK_MODE_ATTR(link_speed) \ |
| do { \ |
| if (attr == &dev_attr_link_##link_speed.attr && \ |
| link_ksettings.base.speed == SPEED_##link_speed) \ |
| return attr->mode; \ |
| } while (0) |
| |
| static umode_t netdev_trig_link_speed_visible(struct kobject *kobj, |
| struct attribute *attr, int n) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct led_netdev_data *trigger_data; |
| unsigned long *supported_link_modes; |
| u32 mode; |
| |
| trigger_data = led_trigger_get_drvdata(dev); |
| supported_link_modes = trigger_data->supported_link_modes; |
| |
| /* |
| * Search in the supported link mode mask a matching supported mode. |
| * Stop at the first matching entry as we care only to check if a particular |
| * speed is supported and not the kind. |
| */ |
| for_each_set_bit(mode, supported_link_modes, __ETHTOOL_LINK_MODE_MASK_NBITS) { |
| struct ethtool_link_ksettings link_ksettings; |
| |
| ethtool_params_from_link_mode(&link_ksettings, mode); |
| |
| CHECK_LINK_MODE_ATTR(10); |
| CHECK_LINK_MODE_ATTR(100); |
| CHECK_LINK_MODE_ATTR(1000); |
| CHECK_LINK_MODE_ATTR(2500); |
| CHECK_LINK_MODE_ATTR(5000); |
| CHECK_LINK_MODE_ATTR(10000); |
| } |
| |
| return 0; |
| } |
| |
| static struct attribute *netdev_trig_link_speed_attrs[] = { |
| &dev_attr_link_10.attr, |
| &dev_attr_link_100.attr, |
| &dev_attr_link_1000.attr, |
| &dev_attr_link_2500.attr, |
| &dev_attr_link_5000.attr, |
| &dev_attr_link_10000.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group netdev_trig_link_speed_attrs_group = { |
| .attrs = netdev_trig_link_speed_attrs, |
| .is_visible = netdev_trig_link_speed_visible, |
| }; |
| |
| static struct attribute *netdev_trig_attrs[] = { |
| &dev_attr_device_name.attr, |
| &dev_attr_link.attr, |
| &dev_attr_full_duplex.attr, |
| &dev_attr_half_duplex.attr, |
| &dev_attr_rx.attr, |
| &dev_attr_tx.attr, |
| &dev_attr_rx_err.attr, |
| &dev_attr_tx_err.attr, |
| &dev_attr_interval.attr, |
| &dev_attr_offloaded.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group netdev_trig_attrs_group = { |
| .attrs = netdev_trig_attrs, |
| }; |
| |
| static const struct attribute_group *netdev_trig_groups[] = { |
| &netdev_trig_attrs_group, |
| &netdev_trig_link_speed_attrs_group, |
| NULL, |
| }; |
| |
| static int netdev_trig_notify(struct notifier_block *nb, |
| unsigned long evt, void *dv) |
| { |
| struct net_device *dev = |
| netdev_notifier_info_to_dev((struct netdev_notifier_info *)dv); |
| struct led_netdev_data *trigger_data = |
| container_of(nb, struct led_netdev_data, notifier); |
| struct led_classdev *led_cdev = trigger_data->led_cdev; |
| |
| if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE |
| && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER |
| && evt != NETDEV_CHANGENAME) |
| return NOTIFY_DONE; |
| |
| if (!(dev == trigger_data->net_dev || |
| (evt == NETDEV_CHANGENAME && !strcmp(dev->name, trigger_data->device_name)) || |
| (evt == NETDEV_REGISTER && !strcmp(dev->name, trigger_data->device_name)))) |
| return NOTIFY_DONE; |
| |
| cancel_delayed_work_sync(&trigger_data->work); |
| |
| mutex_lock(&trigger_data->lock); |
| |
| trigger_data->carrier_link_up = false; |
| trigger_data->link_speed = SPEED_UNKNOWN; |
| trigger_data->duplex = DUPLEX_UNKNOWN; |
| switch (evt) { |
| case NETDEV_CHANGENAME: |
| case NETDEV_REGISTER: |
| dev_put(trigger_data->net_dev); |
| dev_hold(dev); |
| trigger_data->net_dev = dev; |
| if (evt == NETDEV_CHANGENAME) |
| get_device_state(trigger_data); |
| break; |
| case NETDEV_UNREGISTER: |
| dev_put(trigger_data->net_dev); |
| trigger_data->net_dev = NULL; |
| break; |
| case NETDEV_UP: |
| trigger_data->hw_control = can_hw_control(trigger_data); |
| fallthrough; |
| case NETDEV_CHANGE: |
| get_device_state(trigger_data); |
| /* Refresh link_speed visibility */ |
| if (evt == NETDEV_CHANGE) |
| sysfs_update_group(&led_cdev->dev->kobj, |
| &netdev_trig_link_speed_attrs_group); |
| break; |
| } |
| |
| set_baseline_state(trigger_data); |
| |
| mutex_unlock(&trigger_data->lock); |
| |
| return NOTIFY_DONE; |
| } |
| |
| /* here's the real work! */ |
| static void netdev_trig_work(struct work_struct *work) |
| { |
| struct led_netdev_data *trigger_data = |
| container_of(work, struct led_netdev_data, work.work); |
| struct rtnl_link_stats64 *dev_stats; |
| unsigned int new_activity; |
| struct rtnl_link_stats64 temp; |
| unsigned long interval; |
| int invert; |
| |
| /* If we dont have a device, insure we are off */ |
| if (!trigger_data->net_dev) { |
| led_set_brightness(trigger_data->led_cdev, LED_OFF); |
| return; |
| } |
| |
| /* If we are not looking for RX/TX then return */ |
| if (!test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) && |
| !test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) && |
| !test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) && |
| !test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode)) |
| return; |
| |
| dev_stats = dev_get_stats(trigger_data->net_dev, &temp); |
| new_activity = |
| (test_bit(TRIGGER_NETDEV_TX, &trigger_data->mode) ? |
| dev_stats->tx_packets : 0) + |
| (test_bit(TRIGGER_NETDEV_RX, &trigger_data->mode) ? |
| dev_stats->rx_packets : 0) + |
| (test_bit(TRIGGER_NETDEV_TX_ERR, &trigger_data->mode) ? |
| dev_stats->tx_errors : 0) + |
| (test_bit(TRIGGER_NETDEV_RX_ERR, &trigger_data->mode) ? |
| dev_stats->rx_errors : 0); |
| |
| if (trigger_data->last_activity != new_activity) { |
| led_stop_software_blink(trigger_data->led_cdev); |
| |
| invert = test_bit(TRIGGER_NETDEV_LINK, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_LINK_10, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_LINK_100, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_LINK_1000, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_LINK_2500, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_LINK_5000, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_LINK_10000, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_HALF_DUPLEX, &trigger_data->mode) || |
| test_bit(TRIGGER_NETDEV_FULL_DUPLEX, &trigger_data->mode); |
| interval = jiffies_to_msecs( |
| atomic_read(&trigger_data->interval)); |
| /* base state is ON (link present) */ |
| led_blink_set_oneshot(trigger_data->led_cdev, |
| &interval, |
| &interval, |
| invert); |
| trigger_data->last_activity = new_activity; |
| } |
| |
| schedule_delayed_work(&trigger_data->work, |
| (atomic_read(&trigger_data->interval)*2)); |
| } |
| |
| static int netdev_trig_activate(struct led_classdev *led_cdev) |
| { |
| struct led_netdev_data *trigger_data; |
| unsigned long mode = 0; |
| struct device *dev; |
| int rc; |
| |
| trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL); |
| if (!trigger_data) |
| return -ENOMEM; |
| |
| mutex_init(&trigger_data->lock); |
| |
| trigger_data->notifier.notifier_call = netdev_trig_notify; |
| trigger_data->notifier.priority = 10; |
| |
| INIT_DELAYED_WORK(&trigger_data->work, netdev_trig_work); |
| |
| trigger_data->led_cdev = led_cdev; |
| trigger_data->net_dev = NULL; |
| trigger_data->device_name[0] = 0; |
| |
| trigger_data->mode = 0; |
| atomic_set(&trigger_data->interval, msecs_to_jiffies(NETDEV_LED_DEFAULT_INTERVAL)); |
| trigger_data->last_activity = 0; |
| |
| /* Check if hw control is active by default on the LED. |
| * Init already enabled mode in hw control. |
| */ |
| if (supports_hw_control(led_cdev)) { |
| dev = led_cdev->hw_control_get_device(led_cdev); |
| if (dev) { |
| const char *name = dev_name(dev); |
| |
| trigger_data->hw_control = true; |
| set_device_name(trigger_data, name, strlen(name)); |
| |
| rc = led_cdev->hw_control_get(led_cdev, &mode); |
| if (!rc) |
| trigger_data->mode = mode; |
| } |
| } |
| |
| led_set_trigger_data(led_cdev, trigger_data); |
| |
| rc = register_netdevice_notifier(&trigger_data->notifier); |
| if (rc) |
| kfree(trigger_data); |
| |
| return rc; |
| } |
| |
| static void netdev_trig_deactivate(struct led_classdev *led_cdev) |
| { |
| struct led_netdev_data *trigger_data = led_get_trigger_data(led_cdev); |
| |
| unregister_netdevice_notifier(&trigger_data->notifier); |
| |
| cancel_delayed_work_sync(&trigger_data->work); |
| |
| dev_put(trigger_data->net_dev); |
| |
| kfree(trigger_data); |
| } |
| |
| static struct led_trigger netdev_led_trigger = { |
| .name = "netdev", |
| .activate = netdev_trig_activate, |
| .deactivate = netdev_trig_deactivate, |
| .groups = netdev_trig_groups, |
| }; |
| |
| module_led_trigger(netdev_led_trigger); |
| |
| MODULE_AUTHOR("Ben Whitten <[email protected]>"); |
| MODULE_AUTHOR("Oliver Jowett <[email protected]>"); |
| MODULE_DESCRIPTION("Netdev LED trigger"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("ledtrig:netdev"); |
