drivers/net/wireless/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/init.h>
  20 #include <linux/firmware.h>
  21 #include <linux/etherdevice.h>
  22
  23 #include <net/mac80211.h>
  24 #ifdef CONFIG_P54_LEDS
  25 #include <linux/leds.h>
  26 #endif /* CONFIG_P54_LEDS */
  27
  28 #include "p54.h"
  29 #include "lmac.h"
  30
  31 static void p54_update_leds(struct work_struct *work)
  32 {
  33         struct p54_common *priv = container_of(work, struct p54_common,
  34                                                led_work.work);
  35         int err, i, tmp, blink_delay = 400;
  36         bool rerun = false;
  37
  38         /* Don't toggle the LED, when the device is down. */
  39         if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
  40                 return ;
  41
  42         for (i = 0; i < ARRAY_SIZE(priv->leds); i++)
  43                 if (priv->leds[i].toggled) {
  44                         priv->softled_state |= BIT(i);
  45
  46                         tmp = 70 + 200 / (priv->leds[i].toggled);
  47                         if (tmp < blink_delay)
  48                                 blink_delay = tmp;
  49
  50                         if (priv->leds[i].led_dev.brightness == LED_OFF)
  51                                 rerun = true;
  52
  53                         priv->leds[i].toggled =
  54                                 !!priv->leds[i].led_dev.brightness;
  55                 } else
  56                         priv->softled_state &= ~BIT(i);
  57
  58         err = p54_set_leds(priv);
  59         if (err && net_ratelimit())
  60                 printk(KERN_ERR "%s: failed to update LEDs (%d).\n",
  61                         wiphy_name(priv->hw->wiphy), err);
  62
  63         if (rerun)
  64                 ieee80211_queue_delayed_work(priv->hw, &priv->led_work,
  65                         msecs_to_jiffies(blink_delay));
  66 }
  67
  68 static void p54_led_brightness_set(struct led_classdev *led_dev,
  69                                    enum led_brightness brightness)
  70 {
  71         struct p54_led_dev *led = container_of(led_dev, struct p54_led_dev,
  72                                                led_dev);
  73         struct ieee80211_hw *dev = led->hw_dev;
  74         struct p54_common *priv = dev->priv;
  75
  76         if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
  77                 return ;
  78
  79         if ((brightness) && (led->registered)) {
  80                 led->toggled++;
  81                 ieee80211_queue_delayed_work(priv->hw, &priv->led_work, HZ/10);
  82         }
  83 }
  84
  85 static int p54_register_led(struct p54_common *priv,
  86                             unsigned int led_index,
  87                             char *name, char *trigger)
  88 {
  89         struct p54_led_dev *led = &priv->leds[led_index];
  90         int err;
  91
  92         if (led->registered)
  93                 return -EEXIST;
  94
  95         snprintf(led->name, sizeof(led->name), "p54-%s::%s",
  96                  wiphy_name(priv->hw->wiphy), name);
  97         led->hw_dev = priv->hw;
  98         led->index = led_index;
  99         led->led_dev.name = led->name;
 100         led->led_dev.default_trigger = trigger;
 101         led->led_dev.brightness_set = p54_led_brightness_set;
 102
 103         err = led_classdev_register(wiphy_dev(priv->hw->wiphy), &led->led_dev);
 104         if (err)
 105                 printk(KERN_ERR "%s: Failed to register %s LED.\n",
 106                         wiphy_name(priv->hw->wiphy), name);
 107         else
 108                 led->registered = 1;
 109
 110         return err;
 111 }
 112
 113 int p54_init_leds(struct p54_common *priv)
 114 {
 115         int err;
 116
 117         /*
 118          * TODO:
 119          * Figure out if the EEPROM contains some hints about the number
 120          * of available/programmable LEDs of the device.
 121          */
 122
 123         INIT_DELAYED_WORK(&priv->led_work, p54_update_leds);
 124
 125         err = p54_register_led(priv, 0, "assoc",
 126                                ieee80211_get_assoc_led_name(priv->hw));
 127         if (err)
 128                 return err;
 129
 130         err = p54_register_led(priv, 1, "tx",
 131                                ieee80211_get_tx_led_name(priv->hw));
 132         if (err)
 133                 return err;
 134
 135         err = p54_register_led(priv, 2, "rx",
 136                                ieee80211_get_rx_led_name(priv->hw));
 137         if (err)
 138                 return err;
 139
 140         err = p54_register_led(priv, 3, "radio",
 141                                ieee80211_get_radio_led_name(priv->hw));
 142         if (err)
 143                 return err;
 144
 145         err = p54_set_leds(priv);
 146         return err;
 147 }
 148
 149 void p54_unregister_leds(struct p54_common *priv)
 150 {
 151         int i;
 152
 153         for (i = 0; i < ARRAY_SIZE(priv->leds); i++) {
 154                 if (priv->leds[i].registered) {
 155                         priv->leds[i].registered = false;
 156                         priv->leds[i].toggled = 0;
 157                         led_classdev_unregister(&priv->leds[i].led_dev);
 158                 }
 159         }
 160
 161         cancel_delayed_work_sync(&priv->led_work);
 162 }