/* * 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 #define SWCONFIG_LED_PORT_SPEED_NA 0x01 /* unknown speed */ #define SWCONFIG_LED_PORT_SPEED_10 0x02 /* 10 Mbps */ #define SWCONFIG_LED_PORT_SPEED_100 0x04 /* 100 Mbps */ #define SWCONFIG_LED_PORT_SPEED_1000 0x08 /* 1000 Mbps */ #define SWCONFIG_LED_PORT_SPEED_ALL (SWCONFIG_LED_PORT_SPEED_NA | \ SWCONFIG_LED_PORT_SPEED_10 | \ SWCONFIG_LED_PORT_SPEED_100 | \ SWCONFIG_LED_PORT_SPEED_1000) 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 long port_traffic[SWCONFIG_LED_NUM_PORTS]; u8 link_speed[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; u8 speed_mask; }; static void swconfig_trig_set_brightness(struct swconfig_trig_data *trig_data, enum led_brightness brightness) { led_set_brightness(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; int ret; bool changed; ret = kstrtoul(buf, 0, &port_mask); if (ret) return ret; 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); return size; } 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); /* speed_mask file handler - display value */ static ssize_t swconfig_trig_speed_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->speed_mask); read_unlock(&trig_data->lock); return strlen(buf) + 1; } /* speed_mask file handler - store value */ static ssize_t swconfig_trig_speed_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; u8 speed_mask; int ret; ret = kstrtou8(buf, 0, &speed_mask); if (ret) return ret; write_lock(&trig_data->lock); trig_data->speed_mask = speed_mask & SWCONFIG_LED_PORT_SPEED_ALL; write_unlock(&trig_data->lock); return size; } /* speed_mask special file */ static DEVICE_ATTR(speed_mask, 0644, swconfig_trig_speed_mask_show, swconfig_trig_speed_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; trig_data->speed_mask = SWCONFIG_LED_PORT_SPEED_ALL; led_cdev->trigger_data = trig_data; err = device_create_file(led_cdev->dev, &dev_attr_port_mask); if (err) goto err_free; err = device_create_file(led_cdev->dev, &dev_attr_speed_mask); if (err) goto err_dev_free; return; err_dev_free: device_remove_file(led_cdev->dev, &dev_attr_port_mask); 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); device_remove_file(led_cdev->dev, &dev_attr_speed_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; u8 speed_mask; trig_data = led_cdev->trigger_data; if (!trig_data) return; read_lock(&trig_data->lock); port_mask = trig_data->port_mask; speed_mask = trig_data->speed_mask; read_unlock(&trig_data->lock); link = !!(sw_trig->port_link & port_mask); if (!link) { if (link != trig_data->prev_link) swconfig_trig_set_brightness(trig_data, LED_OFF); } else { unsigned long traffic; int speedok; /* link speed flag */ int i; traffic = 0; speedok = 0; for (i = 0; i < SWCONFIG_LED_NUM_PORTS; i++) { if (port_mask & (1 << i)) if (sw_trig->link_speed[i] & speed_mask) { traffic += sw_trig->port_traffic[i]; speedok = 1; } } if (speedok) { /* At least one port speed matches speed_mask */ 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); } else if (trig_data->prev_brightness != LED_OFF) 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; sw_trig->link_speed[i] = 0; 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; switch (port_link.speed) { case SWITCH_PORT_SPEED_UNKNOWN: sw_trig->link_speed[i] = SWCONFIG_LED_PORT_SPEED_NA; break; case SWITCH_PORT_SPEED_10: sw_trig->link_speed[i] = SWCONFIG_LED_PORT_SPEED_10; break; case SWITCH_PORT_SPEED_100: sw_trig->link_speed[i] = SWCONFIG_LED_PORT_SPEED_100; break; case SWITCH_PORT_SPEED_1000: sw_trig->link_speed[i] = SWCONFIG_LED_PORT_SPEED_1000; break; } } } 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 */