-From 06f502f57d0d7728f9fa0f157ec5e4111ddb98f6 Mon Sep 17 00:00:00 2001
-From: Ben Whitten <ben.whitten@gmail.com>
-Date: Sun, 10 Dec 2017 21:17:55 +0000
-Subject: [PATCH] leds: trigger: Introduce a NETDEV trigger
-
-This commit introduces a NETDEV trigger for named device
-activity. Available triggers are link, rx, and tx.
-
-Signed-off-by: Ben Whitten <ben.whitten@gmail.com>
-Acked-by: Pavel Machek <pavel@ucw.cz>
-Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
----
- .../ABI/testing/sysfs-class-led-trigger-netdev | 45 ++
- drivers/leds/trigger/Kconfig | 7 +
- drivers/leds/trigger/Makefile | 1 +
- drivers/leds/trigger/ledtrig-netdev.c | 496 +++++++++++++++++++++
- 4 files changed, 549 insertions(+)
- create mode 100644 Documentation/ABI/testing/sysfs-class-led-trigger-netdev
- create mode 100644 drivers/leds/trigger/ledtrig-netdev.c
-
---- /dev/null
-+++ b/Documentation/ABI/testing/sysfs-class-led-trigger-netdev
-@@ -0,0 +1,45 @@
-+What: /sys/class/leds/<led>/device_name
-+Date: Dec 2017
-+KernelVersion: 4.16
-+Contact: linux-leds@vger.kernel.org
-+Description:
-+ Specifies the network device name to monitor.
-+
-+What: /sys/class/leds/<led>/interval
-+Date: Dec 2017
-+KernelVersion: 4.16
-+Contact: linux-leds@vger.kernel.org
-+Description:
-+ Specifies the duration of the LED blink in milliseconds.
-+ Defaults to 50 ms.
-+
-+What: /sys/class/leds/<led>/link
-+Date: Dec 2017
-+KernelVersion: 4.16
-+Contact: linux-leds@vger.kernel.org
-+Description:
-+ Signal the link state of the named network device.
-+ If set to 0 (default), the LED's normal state is off.
-+ If set to 1, the LED's normal state reflects the link state
-+ of the named network device.
-+ Setting this value also immediately changes the LED state.
-+
-+What: /sys/class/leds/<led>/tx
-+Date: Dec 2017
-+KernelVersion: 4.16
-+Contact: linux-leds@vger.kernel.org
-+Description:
-+ Signal transmission of data on the named network device.
-+ If set to 0 (default), the LED will not blink on transmission.
-+ If set to 1, the LED will blink for the milliseconds specified
-+ in interval to signal transmission.
-+
-+What: /sys/class/leds/<led>/rx
-+Date: Dec 2017
-+KernelVersion: 4.16
-+Contact: linux-leds@vger.kernel.org
-+Description:
-+ Signal reception of data on the named network device.
-+ If set to 0 (default), the LED will not blink on reception.
-+ If set to 1, the LED will blink for the milliseconds specified
-+ in interval to signal reception.
---- a/drivers/leds/trigger/Kconfig
-+++ b/drivers/leds/trigger/Kconfig
-@@ -126,4 +126,11 @@ config LEDS_TRIGGER_PANIC
- a different trigger.
- If unsure, say Y.
-
-+config LEDS_TRIGGER_NETDEV
-+ tristate "LED Netdev Trigger"
-+ depends on NET && LEDS_TRIGGERS
-+ help
-+ This allows LEDs to be controlled by network device activity.
-+ If unsure, say Y.
-+
- endif # LEDS_TRIGGERS
---- a/drivers/leds/trigger/Makefile
-+++ b/drivers/leds/trigger/Makefile
-@@ -10,3 +10,4 @@ obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) +=
- obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT) += ledtrig-transient.o
- obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o
- obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o
-+obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
---- /dev/null
-+++ b/drivers/leds/trigger/ledtrig-netdev.c
-@@ -0,0 +1,496 @@
-+// SPDX-License-Identifier: GPL-2.0
-+// Copyright 2017 Ben Whitten <ben.whitten@gmail.com>
-+// Copyright 2007 Oliver Jowett <oliver@opencloud.com>
-+//
-+// 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 <rpurdie@openedhand.com>
-+
-+#include <linux/atomic.h>
-+#include <linux/ctype.h>
-+#include <linux/device.h>
-+#include <linux/init.h>
-+#include <linux/jiffies.h>
-+#include <linux/kernel.h>
-+#include <linux/leds.h>
-+#include <linux/list.h>
-+#include <linux/module.h>
-+#include <linux/netdevice.h>
-+#include <linux/spinlock.h>
-+#include <linux/timer.h>
-+#include "../leds.h"
-+
-+/*
-+ * 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
-+ *
-+ */
-+
-+struct led_netdev_data {
-+ spinlock_t 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;
-+#define NETDEV_LED_LINK 0
-+#define NETDEV_LED_TX 1
-+#define NETDEV_LED_RX 2
-+#define NETDEV_LED_MODE_LINKUP 3
-+};
-+
-+enum netdev_led_attr {
-+ NETDEV_ATTR_LINK,
-+ NETDEV_ATTR_TX,
-+ NETDEV_ATTR_RX
-+};
-+
-+static void set_baseline_state(struct led_netdev_data *trigger_data)
-+{
-+ int current_brightness;
-+ struct led_classdev *led_cdev = trigger_data->led_cdev;
-+
-+ 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 (!test_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode))
-+ led_set_brightness(led_cdev, LED_OFF);
-+ else {
-+ if (test_bit(NETDEV_LED_LINK, &trigger_data->mode))
-+ 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(NETDEV_LED_TX, &trigger_data->mode) ||
-+ test_bit(NETDEV_LED_RX, &trigger_data->mode))
-+ schedule_delayed_work(&trigger_data->work, 0);
-+ }
-+}
-+
-+static ssize_t device_name_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
-+ struct led_netdev_data *trigger_data = led_cdev->trigger_data;
-+ ssize_t len;
-+
-+ spin_lock_bh(&trigger_data->lock);
-+ len = sprintf(buf, "%s\n", trigger_data->device_name);
-+ spin_unlock_bh(&trigger_data->lock);
-+
-+ return len;
-+}
-+
-+static ssize_t device_name_store(struct device *dev,
-+ struct device_attribute *attr, const char *buf,
-+ size_t size)
-+{
-+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
-+ struct led_netdev_data *trigger_data = led_cdev->trigger_data;
-+
-+ if (size >= IFNAMSIZ)
-+ return -EINVAL;
-+
-+ cancel_delayed_work_sync(&trigger_data->work);
-+
-+ spin_lock_bh(&trigger_data->lock);
-+
-+ if (trigger_data->net_dev) {
-+ dev_put(trigger_data->net_dev);
-+ trigger_data->net_dev = NULL;
-+ }
-+
-+ strncpy(trigger_data->device_name, buf, size);
-+ 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);
-+
-+ clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
-+ if (trigger_data->net_dev != NULL)
-+ if (netif_carrier_ok(trigger_data->net_dev))
-+ set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
-+
-+ trigger_data->last_activity = 0;
-+
-+ set_baseline_state(trigger_data);
-+ spin_unlock_bh(&trigger_data->lock);
-+
-+ return size;
-+}
-+
-+static DEVICE_ATTR_RW(device_name);
-+
-+static ssize_t netdev_led_attr_show(struct device *dev, char *buf,
-+ enum netdev_led_attr attr)
-+{
-+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
-+ struct led_netdev_data *trigger_data = led_cdev->trigger_data;
-+ int bit;
-+
-+ switch (attr) {
-+ case NETDEV_ATTR_LINK:
-+ bit = NETDEV_LED_LINK;
-+ break;
-+ case NETDEV_ATTR_TX:
-+ bit = NETDEV_LED_TX;
-+ break;
-+ case NETDEV_ATTR_RX:
-+ bit = NETDEV_LED_RX;
-+ 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 netdev_led_attr attr)
-+{
-+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
-+ struct led_netdev_data *trigger_data = led_cdev->trigger_data;
-+ unsigned long state;
-+ int ret;
-+ int bit;
-+
-+ ret = kstrtoul(buf, 0, &state);
-+ if (ret)
-+ return ret;
-+
-+ switch (attr) {
-+ case NETDEV_ATTR_LINK:
-+ bit = NETDEV_LED_LINK;
-+ break;
-+ case NETDEV_ATTR_TX:
-+ bit = NETDEV_LED_TX;
-+ break;
-+ case NETDEV_ATTR_RX:
-+ bit = NETDEV_LED_RX;
-+ break;
-+ default:
-+ return -EINVAL;
-+ }
-+
-+ cancel_delayed_work_sync(&trigger_data->work);
-+
-+ if (state)
-+ set_bit(bit, &trigger_data->mode);
-+ else
-+ clear_bit(bit, &trigger_data->mode);
-+
-+ set_baseline_state(trigger_data);
-+
-+ return size;
-+}
-+
-+static ssize_t link_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ return netdev_led_attr_show(dev, buf, NETDEV_ATTR_LINK);
-+}
-+
-+static ssize_t link_store(struct device *dev,
-+ struct device_attribute *attr, const char *buf, size_t size)
-+{
-+ return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_LINK);
-+}
-+
-+static DEVICE_ATTR_RW(link);
-+
-+static ssize_t tx_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ return netdev_led_attr_show(dev, buf, NETDEV_ATTR_TX);
-+}
-+
-+static ssize_t tx_store(struct device *dev,
-+ struct device_attribute *attr, const char *buf, size_t size)
-+{
-+ return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_TX);
-+}
-+
-+static DEVICE_ATTR_RW(tx);
-+
-+static ssize_t rx_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ return netdev_led_attr_show(dev, buf, NETDEV_ATTR_RX);
-+}
-+
-+static ssize_t rx_store(struct device *dev,
-+ struct device_attribute *attr, const char *buf, size_t size)
-+{
-+ return netdev_led_attr_store(dev, buf, size, NETDEV_ATTR_RX);
-+}
-+
-+static DEVICE_ATTR_RW(rx);
-+
-+static ssize_t interval_show(struct device *dev,
-+ struct device_attribute *attr, char *buf)
-+{
-+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
-+ struct led_netdev_data *trigger_data = led_cdev->trigger_data;
-+
-+ 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_classdev *led_cdev = dev_get_drvdata(dev);
-+ struct led_netdev_data *trigger_data = led_cdev->trigger_data;
-+ unsigned long value;
-+ int ret;
-+
-+ 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 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);
-+
-+ if (evt != NETDEV_UP && evt != NETDEV_DOWN && evt != NETDEV_CHANGE
-+ && evt != NETDEV_REGISTER && evt != NETDEV_UNREGISTER
-+ && evt != NETDEV_CHANGENAME)
-+ return NOTIFY_DONE;
-+
-+ if (strcmp(dev->name, trigger_data->device_name))
-+ return NOTIFY_DONE;
-+
-+ cancel_delayed_work_sync(&trigger_data->work);
-+
-+ spin_lock_bh(&trigger_data->lock);
-+
-+ clear_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
-+ switch (evt) {
-+ case NETDEV_REGISTER:
-+ if (trigger_data->net_dev)
-+ dev_put(trigger_data->net_dev);
-+ dev_hold(dev);
-+ trigger_data->net_dev = dev;
-+ break;
-+ case NETDEV_CHANGENAME:
-+ case NETDEV_UNREGISTER:
-+ if (trigger_data->net_dev) {
-+ dev_put(trigger_data->net_dev);
-+ trigger_data->net_dev = NULL;
-+ }
-+ break;
-+ case NETDEV_UP:
-+ case NETDEV_CHANGE:
-+ if (netif_carrier_ok(dev))
-+ set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
-+ break;
-+ }
-+
-+ set_baseline_state(trigger_data);
-+
-+ spin_unlock_bh(&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(NETDEV_LED_TX, &trigger_data->mode) &&
-+ !test_bit(NETDEV_LED_RX, &trigger_data->mode))
-+ return;
-+
-+ dev_stats = dev_get_stats(trigger_data->net_dev, &temp);
-+ new_activity =
-+ (test_bit(NETDEV_LED_TX, &trigger_data->mode) ?
-+ dev_stats->tx_packets : 0) +
-+ (test_bit(NETDEV_LED_RX, &trigger_data->mode) ?
-+ dev_stats->rx_packets : 0);
-+
-+ if (trigger_data->last_activity != new_activity) {
-+ led_stop_software_blink(trigger_data->led_cdev);
-+
-+ invert = test_bit(NETDEV_LED_LINK, &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 void netdev_trig_activate(struct led_classdev *led_cdev)
-+{
-+ struct led_netdev_data *trigger_data;
-+ int rc;
-+
-+ trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
-+ if (!trigger_data)
-+ return;
-+
-+ spin_lock_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(50));
-+ trigger_data->last_activity = 0;
-+
-+ led_cdev->trigger_data = trigger_data;
-+
-+ rc = device_create_file(led_cdev->dev, &dev_attr_device_name);
-+ if (rc)
-+ goto err_out;
-+ rc = device_create_file(led_cdev->dev, &dev_attr_link);
-+ if (rc)
-+ goto err_out_device_name;
-+ rc = device_create_file(led_cdev->dev, &dev_attr_rx);
-+ if (rc)
-+ goto err_out_link;
-+ rc = device_create_file(led_cdev->dev, &dev_attr_tx);
-+ if (rc)
-+ goto err_out_rx;
-+ rc = device_create_file(led_cdev->dev, &dev_attr_interval);
-+ if (rc)
-+ goto err_out_tx;
-+ rc = register_netdevice_notifier(&trigger_data->notifier);
-+ if (rc)
-+ goto err_out_interval;
-+ return;
-+
-+err_out_interval:
-+ device_remove_file(led_cdev->dev, &dev_attr_interval);
-+err_out_tx:
-+ device_remove_file(led_cdev->dev, &dev_attr_tx);
-+err_out_rx:
-+ device_remove_file(led_cdev->dev, &dev_attr_rx);
-+err_out_link:
-+ device_remove_file(led_cdev->dev, &dev_attr_link);
-+err_out_device_name:
-+ device_remove_file(led_cdev->dev, &dev_attr_device_name);
-+err_out:
-+ led_cdev->trigger_data = NULL;
-+ kfree(trigger_data);
-+}
-+
-+static void netdev_trig_deactivate(struct led_classdev *led_cdev)
-+{
-+ struct led_netdev_data *trigger_data = led_cdev->trigger_data;
-+
-+ if (trigger_data) {
-+ unregister_netdevice_notifier(&trigger_data->notifier);
-+
-+ device_remove_file(led_cdev->dev, &dev_attr_device_name);
-+ device_remove_file(led_cdev->dev, &dev_attr_link);
-+ device_remove_file(led_cdev->dev, &dev_attr_rx);
-+ device_remove_file(led_cdev->dev, &dev_attr_tx);
-+ device_remove_file(led_cdev->dev, &dev_attr_interval);
-+
-+ cancel_delayed_work_sync(&trigger_data->work);
-+
-+ if (trigger_data->net_dev)
-+ 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,
-+};
-+
-+static int __init netdev_trig_init(void)
-+{
-+ return led_trigger_register(&netdev_led_trigger);
-+}
-+
-+static void __exit netdev_trig_exit(void)
-+{
-+ led_trigger_unregister(&netdev_led_trigger);
-+}
-+
-+module_init(netdev_trig_init);
-+module_exit(netdev_trig_exit);
-+
-+MODULE_AUTHOR("Ben Whitten <ben.whitten@gmail.com>");
-+MODULE_AUTHOR("Oliver Jowett <oliver@opencloud.com>");
-+MODULE_DESCRIPTION("Netdev LED trigger");
-+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / dedeckeh.git / blobdiff