LXR linux/drivers/net/wireless/intersil/p54/led.c

   1/*
   2 * Common code for mac80211 Prism54 drivers
   3 *
   4 * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   5 * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   6 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7 *
   8 * Based on:
   9 * - the islsm (softmac prism54) driver, which is:
  10 *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
  11 * - stlc45xx driver
  12 *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License version 2 as
  16 * published by the Free Software Foundation.
  17 */
  18
  19#include <linux/firmware.h>
  20#include <linux/etherdevice.h>
  21
  22#include <net/mac80211.h>
  23#ifdef CONFIG_P54_LEDS
  24#include <linux/leds.h>
  25#endif /* CONFIG_P54_LEDS */
  26
  27#include "p54.h"
  28#include "lmac.h"
  29
  30static void p54_update_leds(struct work_struct *work)
  31{
  32        struct p54_common *priv = container_of(work, struct p54_common,
  33                                               led_work.work);
  34        int err, i, tmp, blink_delay = 400;
  35        bool rerun = false;
  36
  37        /* Don't toggle the LED, when the device is down. */
  38        if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
  39                return ;
  40
  41        for (i = 0; i < ARRAY_SIZE(priv->leds); i++)
  42                if (priv->leds[i].toggled) {
  43                        priv->softled_state |= BIT(i);
  44
  45                        tmp = 70 + 200 / (priv->leds[i].toggled);
  46                        if (tmp < blink_delay)
  47                                blink_delay = tmp;
  48
  49                        if (priv->leds[i].led_dev.brightness == LED_OFF)
  50                                rerun = true;
  51
  52                        priv->leds[i].toggled =
  53                                !!priv->leds[i].led_dev.brightness;
  54                } else
  55                        priv->softled_state &= ~BIT(i);
  56
  57        err = p54_set_leds(priv);
  58        if (err && net_ratelimit())
  59                wiphy_err(priv->hw->wiphy,
  60                          "failed to update LEDs (%d).\n", err);
  61
  62        if (rerun)
  63                ieee80211_queue_delayed_work(priv->hw, &priv->led_work,
  64                        msecs_to_jiffies(blink_delay));
  65}
  66
  67static void p54_led_brightness_set(struct led_classdev *led_dev,
  68                                   enum led_brightness brightness)
  69{
  70        struct p54_led_dev *led = container_of(led_dev, struct p54_led_dev,
  71                                               led_dev);
  72        struct ieee80211_hw *dev = led->hw_dev;
  73        struct p54_common *priv = dev->priv;
  74
  75        if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
  76                return ;
  77
  78        if ((brightness) && (led->registered)) {
  79                led->toggled++;
  80                ieee80211_queue_delayed_work(priv->hw, &priv->led_work, HZ/10);
  81        }
  82}
  83
  84static int p54_register_led(struct p54_common *priv,
  85                            unsigned int led_index,
  86                            char *name, const char *trigger)
  87{
  88        struct p54_led_dev *led = &priv->leds[led_index];
  89        int err;
  90
  91        if (led->registered)
  92                return -EEXIST;
  93
  94        snprintf(led->name, sizeof(led->name), "p54-%s::%s",
  95                 wiphy_name(priv->hw->wiphy), name);
  96        led->hw_dev = priv->hw;
  97        led->index = led_index;
  98        led->led_dev.name = led->name;
  99        led->led_dev.default_trigger = trigger;
 100        led->led_dev.brightness_set = p54_led_brightness_set;
 101
 102        err = led_classdev_register(wiphy_dev(priv->hw->wiphy), &led->led_dev);
 103        if (err)
 104                wiphy_err(priv->hw->wiphy,
 105                          "Failed to register %s LED.\n", name);
 106        else
 107                led->registered = 1;
 108
 109        return err;
 110}
 111
 112int p54_init_leds(struct p54_common *priv)
 113{
 114        int err;
 115
 116        /*
 117         * TODO:
 118         * Figure out if the EEPROM contains some hints about the number
 119         * of available/programmable LEDs of the device.
 120         */
 121
 122        INIT_DELAYED_WORK(&priv->led_work, p54_update_leds);
 123
 124        err = p54_register_led(priv, 0, "assoc",
 125                               ieee80211_get_assoc_led_name(priv->hw));
 126        if (err)
 127                return err;
 128
 129        err = p54_register_led(priv, 1, "tx",
 130                               ieee80211_get_tx_led_name(priv->hw));
 131        if (err)
 132                return err;
 133
 134        err = p54_register_led(priv, 2, "rx",
 135                               ieee80211_get_rx_led_name(priv->hw));
 136        if (err)
 137                return err;
 138
 139        err = p54_register_led(priv, 3, "radio",
 140                               ieee80211_get_radio_led_name(priv->hw));
 141        if (err)
 142                return err;
 143
 144        err = p54_set_leds(priv);
 145        return err;
 146}
 147
 148void p54_unregister_leds(struct p54_common *priv)
 149{
 150        int i;
 151
 152        for (i = 0; i < ARRAY_SIZE(priv->leds); i++) {
 153                if (priv->leds[i].registered) {
 154                        priv->leds[i].registered = false;
 155                        priv->leds[i].toggled = 0;
 156                        led_classdev_unregister(&priv->leds[i].led_dev);
 157                }
 158        }
 159
 160        cancel_delayed_work_sync(&priv->led_work);
 161}
 162