mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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f7a210d168
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@24646 3c298f89-4303-0410-b956-a3cf2f4a3e73
349 lines
7.9 KiB
C
349 lines
7.9 KiB
C
/*
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* LED USB device Trigger
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*
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* Toggles the LED to reflect the presence and activity of an USB device
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* Copyright (C) Gabor Juhos <juhosg@openwrt.org>
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*
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* derived from ledtrig-netdev.c:
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* Copyright 2007 Oliver Jowett <oliver@opencloud.com>
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*
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* ledtrig-netdev.c derived from ledtrig-timer.c:
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* Copyright 2005-2006 Openedhand Ltd.
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* Author: Richard Purdie <rpurdie@openedhand.com>
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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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*/
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#include <linux/module.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/sysdev.h>
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#include <linux/timer.h>
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#include <linux/ctype.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <linux/usb.h>
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#include "leds.h"
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#define DEV_BUS_ID_SIZE 32
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/*
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* Configurable sysfs attributes:
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*
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* device_name - name of the USB device to monitor
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* activity_interval - duration of LED blink, in milliseconds
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*/
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struct usbdev_trig_data {
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rwlock_t lock;
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struct timer_list timer;
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struct notifier_block notifier;
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struct led_classdev *led_cdev;
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struct usb_device *usb_dev;
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char device_name[DEV_BUS_ID_SIZE];
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unsigned interval;
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int last_urbnum;
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};
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static void usbdev_trig_update_state(struct usbdev_trig_data *td)
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{
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if (td->usb_dev)
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led_set_brightness(td->led_cdev, LED_FULL);
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else
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led_set_brightness(td->led_cdev, LED_OFF);
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if (td->interval && td->usb_dev)
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mod_timer(&td->timer, jiffies + td->interval);
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else
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del_timer(&td->timer);
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}
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static ssize_t usbdev_trig_name_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct usbdev_trig_data *td = led_cdev->trigger_data;
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read_lock(&td->lock);
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sprintf(buf, "%s\n", td->device_name);
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read_unlock(&td->lock);
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return strlen(buf) + 1;
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}
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static ssize_t usbdev_trig_name_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t size)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct usbdev_trig_data *td = led_cdev->trigger_data;
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if (size < 0 || size >= DEV_BUS_ID_SIZE)
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return -EINVAL;
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write_lock(&td->lock);
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strcpy(td->device_name, buf);
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if (size > 0 && td->device_name[size - 1] == '\n')
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td->device_name[size - 1] = 0;
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if (td->device_name[0] != 0) {
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struct usb_device *usb_dev;
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/* check for existing device to update from */
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usb_dev = usb_find_device_by_name(td->device_name);
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if (usb_dev) {
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if (td->usb_dev)
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usb_put_dev(td->usb_dev);
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td->usb_dev = usb_dev;
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td->last_urbnum = atomic_read(&usb_dev->urbnum);
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}
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/* updates LEDs, may start timers */
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usbdev_trig_update_state(td);
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}
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write_unlock(&td->lock);
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return size;
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}
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static DEVICE_ATTR(device_name, 0644, usbdev_trig_name_show,
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usbdev_trig_name_store);
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static ssize_t usbdev_trig_interval_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct usbdev_trig_data *td = led_cdev->trigger_data;
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read_lock(&td->lock);
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sprintf(buf, "%u\n", jiffies_to_msecs(td->interval));
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read_unlock(&td->lock);
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return strlen(buf) + 1;
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}
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static ssize_t usbdev_trig_interval_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t size)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct usbdev_trig_data *td = led_cdev->trigger_data;
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int ret = -EINVAL;
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char *after;
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unsigned long value = simple_strtoul(buf, &after, 10);
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size_t count = after - buf;
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if (*after && isspace(*after))
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count++;
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if (count == size && value <= 10000) {
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write_lock(&td->lock);
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td->interval = msecs_to_jiffies(value);
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usbdev_trig_update_state(td); /* resets timer */
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write_unlock(&td->lock);
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ret = count;
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}
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return ret;
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}
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static DEVICE_ATTR(activity_interval, 0644, usbdev_trig_interval_show,
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usbdev_trig_interval_store);
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static int usbdev_trig_notify(struct notifier_block *nb,
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unsigned long evt,
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void *data)
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{
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struct usb_device *usb_dev;
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struct usbdev_trig_data *td;
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if (evt != USB_DEVICE_ADD && evt != USB_DEVICE_REMOVE)
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return NOTIFY_DONE;
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usb_dev = data;
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td = container_of(nb, struct usbdev_trig_data, notifier);
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write_lock(&td->lock);
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if (strcmp(dev_name(&usb_dev->dev), td->device_name))
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goto done;
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if (evt == USB_DEVICE_ADD) {
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usb_get_dev(usb_dev);
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if (td->usb_dev != NULL)
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usb_put_dev(td->usb_dev);
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td->usb_dev = usb_dev;
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td->last_urbnum = atomic_read(&usb_dev->urbnum);
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} else if (evt == USB_DEVICE_REMOVE) {
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if (td->usb_dev != NULL) {
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usb_put_dev(td->usb_dev);
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td->usb_dev = NULL;
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}
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}
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usbdev_trig_update_state(td);
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done:
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write_unlock(&td->lock);
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return NOTIFY_DONE;
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}
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/* here's the real work! */
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static void usbdev_trig_timer(unsigned long arg)
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{
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struct usbdev_trig_data *td = (struct usbdev_trig_data *)arg;
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int new_urbnum;
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write_lock(&td->lock);
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if (!td->usb_dev || td->interval == 0) {
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/*
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* we don't need to do timer work, just reflect device presence
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*/
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if (td->usb_dev)
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led_set_brightness(td->led_cdev, LED_FULL);
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else
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led_set_brightness(td->led_cdev, LED_OFF);
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goto no_restart;
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}
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if (td->interval)
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new_urbnum = atomic_read(&td->usb_dev->urbnum);
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else
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new_urbnum = 0;
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if (td->usb_dev) {
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/*
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* Base state is ON (device is present). If there's no device,
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* we don't get this far and the LED is off.
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* OFF -> ON always
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* ON -> OFF on activity
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*/
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if (td->led_cdev->brightness == LED_OFF)
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led_set_brightness(td->led_cdev, LED_FULL);
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else if (td->last_urbnum != new_urbnum)
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led_set_brightness(td->led_cdev, LED_OFF);
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} else {
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/*
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* base state is OFF
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* ON -> OFF always
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* OFF -> ON on activity
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*/
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if (td->led_cdev->brightness == LED_FULL)
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led_set_brightness(td->led_cdev, LED_OFF);
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else if (td->last_urbnum != new_urbnum)
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led_set_brightness(td->led_cdev, LED_FULL);
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}
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td->last_urbnum = new_urbnum;
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mod_timer(&td->timer, jiffies + td->interval);
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no_restart:
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write_unlock(&td->lock);
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}
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static void usbdev_trig_activate(struct led_classdev *led_cdev)
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{
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struct usbdev_trig_data *td;
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int rc;
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td = kzalloc(sizeof(struct usbdev_trig_data), GFP_KERNEL);
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if (!td)
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return;
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rwlock_init(&td->lock);
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td->notifier.notifier_call = usbdev_trig_notify;
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td->notifier.priority = 10;
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setup_timer(&td->timer, usbdev_trig_timer, (unsigned long) td);
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td->led_cdev = led_cdev;
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td->interval = msecs_to_jiffies(50);
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led_cdev->trigger_data = td;
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rc = device_create_file(led_cdev->dev, &dev_attr_device_name);
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if (rc)
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goto err_out;
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rc = device_create_file(led_cdev->dev, &dev_attr_activity_interval);
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if (rc)
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goto err_out_device_name;
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usb_register_notify(&td->notifier);
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return;
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err_out_device_name:
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device_remove_file(led_cdev->dev, &dev_attr_device_name);
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err_out:
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led_cdev->trigger_data = NULL;
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kfree(td);
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}
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static void usbdev_trig_deactivate(struct led_classdev *led_cdev)
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{
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struct usbdev_trig_data *td = led_cdev->trigger_data;
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if (td) {
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usb_unregister_notify(&td->notifier);
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device_remove_file(led_cdev->dev, &dev_attr_device_name);
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device_remove_file(led_cdev->dev, &dev_attr_activity_interval);
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write_lock(&td->lock);
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if (td->usb_dev) {
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usb_put_dev(td->usb_dev);
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td->usb_dev = NULL;
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}
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write_unlock(&td->lock);
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del_timer_sync(&td->timer);
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kfree(td);
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}
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}
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static struct led_trigger usbdev_led_trigger = {
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.name = "usbdev",
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.activate = usbdev_trig_activate,
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.deactivate = usbdev_trig_deactivate,
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};
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static int __init usbdev_trig_init(void)
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{
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return led_trigger_register(&usbdev_led_trigger);
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}
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static void __exit usbdev_trig_exit(void)
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{
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led_trigger_unregister(&usbdev_led_trigger);
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}
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module_init(usbdev_trig_init);
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module_exit(usbdev_trig_exit);
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_DESCRIPTION("USB device LED trigger");
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MODULE_LICENSE("GPL v2");
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