kernel/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/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
  30 static 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
  67 static 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
  84 static int p54_register_led(struct p54_common *priv,
  85                             unsigned int led_index,
  86                             char *name, 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
 112 int 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
 148 void 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 }