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@@ -1,371 +0,0 @@
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-/*
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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 <[email protected]>
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- *
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- * derived from ledtrig-netdev.c:
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- * Copyright 2007 Oliver Jowett <[email protected]>
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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 <[email protected]>
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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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-
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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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-
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-#include "leds.h"
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-
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-#define DEV_BUS_ID_SIZE 32
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-
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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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-
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-struct usbdev_trig_data {
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- rwlock_t lock;
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-
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- struct timer_list timer;
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- struct notifier_block notifier;
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-
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- struct led_classdev *led_cdev;
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- struct usb_device *usb_dev;
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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- return strlen(buf) + 1;
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-}
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-
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-struct usbdev_trig_match {
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- char *device_name;
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- struct usb_device *usb_dev;
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-};
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-
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-static int usbdev_trig_find_usb_dev(struct usb_device *usb_dev, void *data)
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-{
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- struct usbdev_trig_match *match = data;
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-
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- if (strcmp(dev_name(&usb_dev->dev), match->device_name) != 0)
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- return 0;
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-
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- if (WARN_ON(match->usb_dev))
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- return 0;
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-
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- dev_dbg(&usb_dev->dev, "matched this device!\n");
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- match->usb_dev = usb_get_dev(usb_dev);
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-
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- return 0;
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-}
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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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-
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- if (size < 0 || size >= DEV_BUS_ID_SIZE)
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- return -EINVAL;
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-
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- write_lock(&td->lock);
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-
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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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-
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- if (td->device_name[0] != 0) {
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- struct usbdev_trig_match match = {
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- .device_name = td->device_name,
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- };
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-
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- /* check for existing device to update from */
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- usb_for_each_dev(&match, usbdev_trig_find_usb_dev);
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- if (match.usb_dev) {
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- if (td->usb_dev)
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- usb_put_dev(td->usb_dev);
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-
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- td->usb_dev = match.usb_dev;
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- td->last_urbnum = atomic_read(&match.usb_dev->urbnum);
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- }
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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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-
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- write_unlock(&td->lock);
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- return size;
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-}
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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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-
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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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-
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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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-
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- return strlen(buf) + 1;
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-}
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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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-
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- if (*after && isspace(*after))
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- count++;
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-
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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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-
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- return ret;
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-}
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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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-
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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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-
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- if (evt != USB_DEVICE_ADD && evt != USB_DEVICE_REMOVE)
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- return NOTIFY_DONE;
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-
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- usb_dev = data;
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- td = container_of(nb, struct usbdev_trig_data, notifier);
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-
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- write_lock(&td->lock);
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-
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- if (strcmp(dev_name(&usb_dev->dev), td->device_name))
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- goto done;
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-
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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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-
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- usbdev_trig_update_state(td);
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-
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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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-
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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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-
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- write_lock(&td->lock);
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-
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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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-
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- goto no_restart;
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- }
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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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-
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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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-
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- td->last_urbnum = new_urbnum;
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- mod_timer(&td->timer, jiffies + td->interval);
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-
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-no_restart:
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- write_unlock(&td->lock);
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-}
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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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-
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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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-
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- rwlock_init(&td->lock);
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-
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- td->notifier.notifier_call = usbdev_trig_notify;
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- td->notifier.priority = 10;
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-
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- setup_timer(&td->timer, usbdev_trig_timer, (unsigned long) td);
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-
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- td->led_cdev = led_cdev;
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- td->interval = msecs_to_jiffies(50);
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-
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- led_cdev->trigger_data = td;
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-
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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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-
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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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-
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- usb_register_notify(&td->notifier);
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- return;
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-
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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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-
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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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-
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- if (td) {
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- usb_unregister_notify(&td->notifier);
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-
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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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-
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- write_lock(&td->lock);
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-
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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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-
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- write_unlock(&td->lock);
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-
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- del_timer_sync(&td->timer);
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-
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- kfree(td);
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- }
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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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-
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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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-
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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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-
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-module_init(usbdev_trig_init);
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-module_exit(usbdev_trig_exit);
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-
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-MODULE_AUTHOR("Gabor Juhos <[email protected]>");
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-MODULE_DESCRIPTION("USB device LED trigger");
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-MODULE_LICENSE("GPL v2");
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Rafał Miłecki