![Rafał Miłecki](/assets/img/avatar_default.png)
This commit adds a new trigger responsible for turning on LED when USB device gets connected to the selected USB port. This can can useful for various home routers that have USB port(s) and a proper LED telling user a device is connected. The trigger gets its documentation file but basically it just requires enabling it and selecting USB ports (e.g. echo 1 > ports/usb1-1). There was a long discussion on design of this driver. Its current state is a result of picking them most adjustable solution as others couldn't handle all cases. 1) It wasn't possible for the driver to register separated trigger for each USB port. Some physical USB ports are handled by more than one controller and so by more than one USB port. E.g. USB 2.0 physical port may be handled by OHCI's port and EHCI's port. It's also not possible to assign more than 1 trigger to a single LED and implementing such feature would be tricky due to syncing triggers and sysfs conflicts with old triggers. 2) Another idea was to register trigger per USB hub. This wouldn't allow handling devices with multiple USB LEDs and controllers (hubs) controlling more than 1 physical port. It's common for hubs to have few ports and each may have its own LED. This final trigger is highly flexible. It allows selecting any USB ports for any LED. It was also modified (comparing to the initial version) to allow choosing ports rather than having user /guess/ proper names. It was successfully tested on SmartRG SR400ac which has 3 USB LEDs, 2 physical ports and 3 controllers. It was noted USB subsystem already has usb-gadget and usb-host triggers but they are pretty trivial ones. They indicate activity only and can't have ports specified. In future it may be good idea to consider adding activity support to usbport as well. This should allow switching to this more generic driver and maybe marking old ones as obsolete. This can be implemented with another sysfs file for setting mode. The default mode wouldn't change so there won't be ABI breakage and so such feature can be safely implemented later. There was also an idea of supporting other devices (PCI, SDIO, etc.) but as this driver already contains some USB specific code (and will get more) these should be probably separated drivers (triggers). Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
315 lines
7.6 KiB
C
315 lines
7.6 KiB
C
/*
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* USB port LED trigger
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*
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* Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/device.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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struct usbport_trig_data {
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struct led_classdev *led_cdev;
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struct list_head ports;
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struct notifier_block nb;
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int count; /* Amount of connected matching devices */
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};
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struct usbport_trig_port {
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struct usbport_trig_data *data;
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struct usb_device *hub;
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int portnum;
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char *port_name;
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bool observed;
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struct device_attribute attr;
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struct list_head list;
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};
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/***************************************
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* Helpers
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***************************************/
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/**
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* usbport_trig_usb_dev_observed - Check if dev is connected to observed port
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*/
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static bool usbport_trig_usb_dev_observed(struct usbport_trig_data *usbport_data,
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struct usb_device *usb_dev)
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{
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struct usbport_trig_port *port;
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if (!usb_dev->parent)
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return false;
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list_for_each_entry(port, &usbport_data->ports, list) {
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if (usb_dev->parent == port->hub &&
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usb_dev->portnum == port->portnum)
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return port->observed;
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}
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return false;
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}
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static int usbport_trig_usb_dev_check(struct usb_device *usb_dev, void *data)
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{
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struct usbport_trig_data *usbport_data = data;
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if (usbport_trig_usb_dev_observed(usbport_data, usb_dev))
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usbport_data->count++;
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return 0;
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}
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/**
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* usbport_trig_update_count - Recalculate amount of connected matching devices
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*/
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static void usbport_trig_update_count(struct usbport_trig_data *usbport_data)
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{
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struct led_classdev *led_cdev = usbport_data->led_cdev;
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usbport_data->count = 0;
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usb_for_each_dev(usbport_data, usbport_trig_usb_dev_check);
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led_cdev->brightness_set(led_cdev,
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usbport_data->count ? LED_FULL : LED_OFF);
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}
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/***************************************
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* Device attr
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***************************************/
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static ssize_t usbport_trig_port_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct usbport_trig_port *port = container_of(attr,
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struct usbport_trig_port,
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attr);
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return sprintf(buf, "%d\n", port->observed) + 1;
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}
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static ssize_t usbport_trig_port_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct usbport_trig_port *port = container_of(attr,
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struct usbport_trig_port,
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attr);
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if (!strcmp(buf, "0") || !strcmp(buf, "0\n"))
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port->observed = 0;
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else if (!strcmp(buf, "1") || !strcmp(buf, "1\n"))
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port->observed = 1;
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else
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return -EINVAL;
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usbport_trig_update_count(port->data);
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return size;
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}
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static struct attribute *ports_attrs[] = {
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NULL,
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};
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static const struct attribute_group ports_group = {
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.name = "ports",
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.attrs = ports_attrs,
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};
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/***************************************
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* Adding & removing ports
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***************************************/
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static int usbport_trig_add_port(struct usbport_trig_data *usbport_data,
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struct usb_device *usb_dev,
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const char *hub_name, int portnum)
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{
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struct led_classdev *led_cdev = usbport_data->led_cdev;
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struct usbport_trig_port *port;
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size_t len;
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int err;
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port = kzalloc(sizeof(*port), GFP_KERNEL);
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if (!port) {
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err = -ENOMEM;
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goto err_out;
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}
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port->data = usbport_data;
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port->hub = usb_dev;
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port->portnum = portnum;
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len = strlen(hub_name) + 8;
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port->port_name = kzalloc(len, GFP_KERNEL);
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if (!port->port_name) {
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err = -ENOMEM;
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goto err_free_port;
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}
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snprintf(port->port_name, len, "%s-port%d", hub_name, portnum);
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port->attr.attr.name = port->port_name;
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port->attr.attr.mode = S_IRUSR | S_IWUSR;
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port->attr.show = usbport_trig_port_show;
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port->attr.store = usbport_trig_port_store;
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err = sysfs_add_file_to_group(&led_cdev->dev->kobj, &port->attr.attr,
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ports_group.name);
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if (err)
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goto err_free_port_name;
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list_add_tail(&port->list, &usbport_data->ports);
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return 0;
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err_free_port_name:
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kfree(port->port_name);
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err_free_port:
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kfree(port);
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err_out:
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return err;
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}
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static int usbport_trig_add_usb_dev_ports(struct usb_device *usb_dev,
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void *data)
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{
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struct usbport_trig_data *usbport_data = data;
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int i;
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for (i = 1; i <= usb_dev->maxchild; i++)
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usbport_trig_add_port(usbport_data, usb_dev,
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dev_name(&usb_dev->dev), i);
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return 0;
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}
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static void usbport_trig_remove_port(struct usbport_trig_data *usbport_data,
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struct usbport_trig_port *port)
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{
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struct led_classdev *led_cdev = usbport_data->led_cdev;
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list_del(&port->list);
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sysfs_remove_file_from_group(&led_cdev->dev->kobj, &port->attr.attr,
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ports_group.name);
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kfree(port->port_name);
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kfree(port);
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}
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static void usbport_trig_remove_usb_dev_ports(struct usbport_trig_data *usbport_data,
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struct usb_device *usb_dev)
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{
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struct usbport_trig_port *port, *tmp;
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list_for_each_entry_safe(port, tmp, &usbport_data->ports, list) {
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if (port->hub == usb_dev)
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usbport_trig_remove_port(usbport_data, port);
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}
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}
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/***************************************
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* Init, exit, etc.
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***************************************/
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static int usbport_trig_notify(struct notifier_block *nb, unsigned long action,
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void *data)
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{
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struct usbport_trig_data *usbport_data =
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container_of(nb, struct usbport_trig_data, nb);
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struct led_classdev *led_cdev = usbport_data->led_cdev;
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struct usb_device *usb_dev = data;
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bool observed;
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observed = usbport_trig_usb_dev_observed(usbport_data, usb_dev);
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switch (action) {
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case USB_DEVICE_ADD:
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usbport_trig_add_usb_dev_ports(usb_dev, usbport_data);
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if (observed && usbport_data->count++ == 0)
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led_cdev->brightness_set(led_cdev, LED_FULL);
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return NOTIFY_OK;
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case USB_DEVICE_REMOVE:
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usbport_trig_remove_usb_dev_ports(usbport_data, usb_dev);
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if (observed && --usbport_data->count == 0)
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led_cdev->brightness_set(led_cdev, LED_OFF);
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return NOTIFY_OK;
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}
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return NOTIFY_DONE;
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}
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static void usbport_trig_activate(struct led_classdev *led_cdev)
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{
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struct usbport_trig_data *usbport_data;
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int err;
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usbport_data = kzalloc(sizeof(*usbport_data), GFP_KERNEL);
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if (!usbport_data)
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return;
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usbport_data->led_cdev = led_cdev;
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/* List of ports */
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INIT_LIST_HEAD(&usbport_data->ports);
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err = sysfs_create_group(&led_cdev->dev->kobj, &ports_group);
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if (err)
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goto err_free;
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usb_for_each_dev(usbport_data, usbport_trig_add_usb_dev_ports);
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/* Notifications */
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usbport_data->nb.notifier_call = usbport_trig_notify,
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led_cdev->trigger_data = usbport_data;
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usb_register_notify(&usbport_data->nb);
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led_cdev->activated = true;
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return;
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err_free:
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kfree(usbport_data);
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}
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static void usbport_trig_deactivate(struct led_classdev *led_cdev)
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{
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struct usbport_trig_data *usbport_data = led_cdev->trigger_data;
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struct usbport_trig_port *port, *tmp;
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if (!led_cdev->activated)
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return;
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list_for_each_entry_safe(port, tmp, &usbport_data->ports, list) {
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usbport_trig_remove_port(usbport_data, port);
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}
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usb_unregister_notify(&usbport_data->nb);
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sysfs_remove_group(&led_cdev->dev->kobj, &ports_group);
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kfree(usbport_data);
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led_cdev->activated = false;
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}
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static struct led_trigger usbport_led_trigger = {
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.name = "usbport",
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.activate = usbport_trig_activate,
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.deactivate = usbport_trig_deactivate,
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};
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static int __init usbport_trig_init(void)
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{
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return led_trigger_register(&usbport_led_trigger);
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}
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static void __exit usbport_trig_exit(void)
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{
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led_trigger_unregister(&usbport_led_trigger);
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}
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module_init(usbport_trig_init);
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module_exit(usbport_trig_exit);
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MODULE_AUTHOR("Rafał Miłecki <rafal@milecki.pl>");
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MODULE_DESCRIPTION("USB port trigger");
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MODULE_LICENSE("GPL v2");
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