+/*
+ * swconfig_led.c: LED trigger support for the switch configuration API
+ *
+ * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ */
+
+#ifdef CONFIG_SWCONFIG_LEDS
+
+#include <linux/leds.h>
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+
+#define SWCONFIG_LED_TIMER_INTERVAL (HZ / 10)
+#define SWCONFIG_LED_NUM_PORTS 32
+
+struct switch_led_trigger {
+ struct led_trigger trig;
+ struct switch_dev *swdev;
+
+ struct delayed_work sw_led_work;
+ u32 port_mask;
+ u32 port_link;
+ unsigned long port_traffic[SWCONFIG_LED_NUM_PORTS];
+};
+
+struct swconfig_trig_data {
+ struct led_classdev *led_cdev;
+ struct switch_dev *swdev;
+
+ rwlock_t lock;
+ u32 port_mask;
+
+ bool prev_link;
+ unsigned long prev_traffic;
+ enum led_brightness prev_brightness;
+};
+
+static void
+swconfig_trig_set_brightness(struct swconfig_trig_data *trig_data,
+ enum led_brightness brightness)
+{
+ led_brightness_set(trig_data->led_cdev, brightness);
+ trig_data->prev_brightness = brightness;
+}
+
+static void
+swconfig_trig_update_port_mask(struct led_trigger *trigger)
+{
+ struct list_head *entry;
+ struct switch_led_trigger *sw_trig;
+ u32 port_mask;
+
+ if (!trigger)
+ return;
+
+ sw_trig = (void *) trigger;
+
+ port_mask = 0;
+ read_lock(&trigger->leddev_list_lock);
+ list_for_each(entry, &trigger->led_cdevs) {
+ struct led_classdev *led_cdev;
+ struct swconfig_trig_data *trig_data;
+
+ led_cdev = list_entry(entry, struct led_classdev, trig_list);
+ trig_data = led_cdev->trigger_data;
+ if (trig_data) {
+ read_lock(&trig_data->lock);
+ port_mask |= trig_data->port_mask;
+ read_unlock(&trig_data->lock);
+ }
+ }
+ read_unlock(&trigger->leddev_list_lock);
+
+ sw_trig->port_mask = port_mask;
+
+ if (port_mask)
+ schedule_delayed_work(&sw_trig->sw_led_work,
+ SWCONFIG_LED_TIMER_INTERVAL);
+ else
+ cancel_delayed_work_sync(&sw_trig->sw_led_work);
+}
+
+static ssize_t
+swconfig_trig_port_mask_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
+ unsigned long port_mask;
+ ssize_t ret = -EINVAL;
+ char *after;
+ size_t count;
+
+ port_mask = simple_strtoul(buf, &after, 16);
+ count = after - buf;
+
+ if (*after && isspace(*after))
+ count++;
+
+ if (count == size) {
+ bool changed;
+
+ write_lock(&trig_data->lock);
+
+ changed = (trig_data->port_mask != port_mask);
+ if (changed) {
+ trig_data->port_mask = port_mask;
+ if (port_mask == 0)
+ swconfig_trig_set_brightness(trig_data, LED_OFF);
+ }
+
+ write_unlock(&trig_data->lock);
+
+ if (changed)
+ swconfig_trig_update_port_mask(led_cdev->trigger);
+
+ ret = count;
+ }
+
+ return ret;
+}
+
+static ssize_t
+swconfig_trig_port_mask_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct swconfig_trig_data *trig_data = led_cdev->trigger_data;
+
+ read_lock(&trig_data->lock);
+ sprintf(buf, "%#x\n", trig_data->port_mask);
+ read_unlock(&trig_data->lock);
+
+ return strlen(buf) + 1;
+}
+
+static DEVICE_ATTR(port_mask, 0644, swconfig_trig_port_mask_show,
+ swconfig_trig_port_mask_store);
+
+static void
+swconfig_trig_activate(struct led_classdev *led_cdev)
+{
+ struct switch_led_trigger *sw_trig;
+ struct swconfig_trig_data *trig_data;
+ int err;
+
+ if (led_cdev->trigger->activate != swconfig_trig_activate)
+ return;
+
+ trig_data = kzalloc(sizeof(struct swconfig_trig_data), GFP_KERNEL);
+ if (!trig_data)
+ return;
+
+ sw_trig = (void *) led_cdev->trigger;
+
+ rwlock_init(&trig_data->lock);
+ trig_data->led_cdev = led_cdev;
+ trig_data->swdev = sw_trig->swdev;
+ led_cdev->trigger_data = trig_data;
+
+ err = device_create_file(led_cdev->dev, &dev_attr_port_mask);
+ if (err)
+ goto err_free;
+
+ return;
+
+err_free:
+ led_cdev->trigger_data = NULL;
+ kfree(trig_data);
+}
+
+static void
+swconfig_trig_deactivate(struct led_classdev *led_cdev)
+{
+ struct swconfig_trig_data *trig_data;
+
+ swconfig_trig_update_port_mask(led_cdev->trigger);
+
+ trig_data = (void *) led_cdev->trigger_data;
+ if (trig_data) {
+ device_remove_file(led_cdev->dev, &dev_attr_port_mask);
+ kfree(trig_data);
+ }
+}
+
+static void
+swconfig_trig_led_event(struct switch_led_trigger *sw_trig,
+ struct led_classdev *led_cdev)
+{
+ struct swconfig_trig_data *trig_data;
+ u32 port_mask;
+ bool link;
+
+ trig_data = led_cdev->trigger_data;
+ if (!trig_data)
+ return;
+
+ read_lock(&trig_data->lock);
+ port_mask = trig_data->port_mask;
+ read_unlock(&trig_data->lock);
+
+ link = !!(sw_trig->port_link & port_mask);
+ if (!link) {
+ if (link != trig_data->prev_link)
+ led_brightness_set(trig_data->led_cdev, LED_OFF);
+ } else {
+ unsigned long traffic;
+ int i;
+
+ traffic = 0;
+ for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
+ if (port_mask & (1 << i))
+ traffic += sw_trig->port_traffic[i];
+ }
+
+ if (trig_data->prev_brightness != LED_FULL)
+ swconfig_trig_set_brightness(trig_data, LED_FULL);
+ else if (traffic != trig_data->prev_traffic)
+ swconfig_trig_set_brightness(trig_data, LED_OFF);
+
+ trig_data->prev_traffic = traffic;
+ }
+
+ trig_data->prev_link = link;
+}
+
+static void
+swconfig_trig_update_leds(struct switch_led_trigger *sw_trig)
+{
+ struct list_head *entry;
+ struct led_trigger *trigger;
+
+ trigger = &sw_trig->trig;
+ read_lock(&trigger->leddev_list_lock);
+ list_for_each(entry, &trigger->led_cdevs) {
+ struct led_classdev *led_cdev;
+
+ led_cdev = list_entry(entry, struct led_classdev, trig_list);
+ swconfig_trig_led_event(sw_trig, led_cdev);
+ }
+ read_unlock(&trigger->leddev_list_lock);
+}
+
+static void
+swconfig_led_work_func(struct work_struct *work)
+{
+ struct switch_led_trigger *sw_trig;
+ struct switch_dev *swdev;
+ u32 port_mask;
+ u32 link;
+ int i;
+
+ sw_trig = container_of(work, struct switch_led_trigger,
+ sw_led_work.work);
+
+ port_mask = sw_trig->port_mask;
+ swdev = sw_trig->swdev;
+
+ link = 0;
+ for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) {
+ u32 port_bit;
+
+ port_bit = BIT(i);
+ if ((port_mask & port_bit) == 0)
+ continue;
+
+ if (swdev->ops->get_port_link) {
+ struct switch_port_link port_link;
+
+ memset(&port_link, '\0', sizeof(port_link));
+ swdev->ops->get_port_link(swdev, i, &port_link);
+
+ if (port_link.link)
+ link |= port_bit;
+ }
+
+ if (swdev->ops->get_port_stats) {
+ struct switch_port_stats port_stats;
+
+ memset(&port_stats, '\0', sizeof(port_stats));
+ swdev->ops->get_port_stats(swdev, i, &port_stats);
+ sw_trig->port_traffic[i] = port_stats.tx_bytes +
+ port_stats.rx_bytes;
+ }
+ }
+
+ sw_trig->port_link = link;
+
+ swconfig_trig_update_leds(sw_trig);
+
+ schedule_delayed_work(&sw_trig->sw_led_work,
+ SWCONFIG_LED_TIMER_INTERVAL);
+}
+
+static int
+swconfig_create_led_trigger(struct switch_dev *swdev)
+{
+ struct switch_led_trigger *sw_trig;
+ int err;
+
+ if (!swdev->ops->get_port_link)
+ return 0;
+
+ sw_trig = kzalloc(sizeof(struct switch_led_trigger), GFP_KERNEL);
+ if (!sw_trig)
+ return -ENOMEM;
+
+ sw_trig->swdev = swdev;
+ sw_trig->trig.name = swdev->devname;
+ sw_trig->trig.activate = swconfig_trig_activate;
+ sw_trig->trig.deactivate = swconfig_trig_deactivate;
+
+ INIT_DELAYED_WORK(&sw_trig->sw_led_work, swconfig_led_work_func);
+
+ err = led_trigger_register(&sw_trig->trig);
+ if (err)
+ goto err_free;
+
+ swdev->led_trigger = sw_trig;
+
+ return 0;
+
+err_free:
+ kfree(sw_trig);
+ return err;
+}
+
+static void
+swconfig_destroy_led_trigger(struct switch_dev *swdev)
+{
+ struct switch_led_trigger *sw_trig;
+
+ sw_trig = swdev->led_trigger;
+ if (sw_trig) {
+ cancel_delayed_work_sync(&sw_trig->sw_led_work);
+ led_trigger_unregister(&sw_trig->trig);
+ kfree(sw_trig);
+ }
+}
+
+#else /* SWCONFIG_LEDS */
+static inline int
+swconfig_create_led_trigger(struct switch_dev *swdev) { return 0; }
+
+static inline void
+swconfig_destroy_led_trigger(struct switch_dev *swdev) { }
+#endif /* CONFIG_SWCONFIG_LEDS */
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