drivers/net/wireless/ralink/rt2x00/rt2x00leds.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
   4         <http://rt2x00.serialmonkey.com>
   5
   6  */
   7
   8 /*
   9         Module: rt2x00lib
  10         Abstract: rt2x00 led specific routines.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15
  16 #include "rt2x00.h"
  17 #include "rt2x00lib.h"
  18
  19 void rt2x00leds_led_quality(struct rt2x00_dev *rt2x00dev, int rssi)
  20 {
  21         struct rt2x00_led *led = &rt2x00dev->led_qual;
  22         unsigned int brightness;
  23
  24         if ((led->type != LED_TYPE_QUALITY) || !(led->flags & LED_REGISTERED))
  25                 return;
  26
  27         /*
  28          * Led handling requires a positive value for the rssi,
  29          * to do that correctly we need to add the correction.
  30          */
  31         rssi += rt2x00dev->rssi_offset;
  32
  33         /*
  34          * Get the rssi level, this is used to convert the rssi
  35          * to a LED value inside the range LED_OFF - LED_FULL.
  36          */
  37         if (rssi <= 30)
  38                 rssi = 0;
  39         else if (rssi <= 39)
  40                 rssi = 1;
  41         else if (rssi <= 49)
  42                 rssi = 2;
  43         else if (rssi <= 53)
  44                 rssi = 3;
  45         else if (rssi <= 63)
  46                 rssi = 4;
  47         else
  48                 rssi = 5;
  49
  50         /*
  51          * Note that we must _not_ send LED_OFF since the driver
  52          * is going to calculate the value and might use it in a
  53          * division.
  54          */
  55         brightness = ((LED_FULL / 6) * rssi) + 1;
  56         if (brightness != led->led_dev.brightness) {
  57                 led->led_dev.brightness_set(&led->led_dev, brightness);
  58                 led->led_dev.brightness = brightness;
  59         }
  60 }
  61
  62 static void rt2x00led_led_simple(struct rt2x00_led *led, bool enabled)
  63 {
  64         unsigned int brightness = enabled ? LED_FULL : LED_OFF;
  65
  66         if (!(led->flags & LED_REGISTERED))
  67                 return;
  68
  69         led->led_dev.brightness_set(&led->led_dev, brightness);
  70         led->led_dev.brightness = brightness;
  71 }
  72
  73 void rt2x00led_led_activity(struct rt2x00_dev *rt2x00dev, bool enabled)
  74 {
  75         if (rt2x00dev->led_qual.type == LED_TYPE_ACTIVITY)
  76                 rt2x00led_led_simple(&rt2x00dev->led_qual, enabled);
  77 }
  78
  79 void rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
  80 {
  81         if (rt2x00dev->led_assoc.type == LED_TYPE_ASSOC)
  82                 rt2x00led_led_simple(&rt2x00dev->led_assoc, enabled);
  83 }
  84
  85 void rt2x00leds_led_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
  86 {
  87         if (rt2x00dev->led_radio.type == LED_TYPE_RADIO)
  88                 rt2x00led_led_simple(&rt2x00dev->led_radio, enabled);
  89 }
  90
  91 static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
  92                                    struct rt2x00_led *led,
  93                                    const char *name)
  94 {
  95         struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
  96         int retval;
  97
  98         led->led_dev.name = name;
  99         led->led_dev.brightness = LED_OFF;
 100
 101         retval = led_classdev_register(device, &led->led_dev);
 102         if (retval) {
 103                 rt2x00_err(rt2x00dev, "Failed to register led handler\n");
 104                 return retval;
 105         }
 106
 107         led->flags |= LED_REGISTERED;
 108
 109         return 0;
 110 }
 111
 112 void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
 113 {
 114         char name[36];
 115         int retval;
 116         unsigned long on_period;
 117         unsigned long off_period;
 118         const char *phy_name = wiphy_name(rt2x00dev->hw->wiphy);
 119
 120         if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
 121                 snprintf(name, sizeof(name), "%s-%s::radio",
 122                          rt2x00dev->ops->name, phy_name);
 123
 124                 retval = rt2x00leds_register_led(rt2x00dev,
 125                                                  &rt2x00dev->led_radio,
 126                                                  name);
 127                 if (retval)
 128                         goto exit_fail;
 129         }
 130
 131         if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
 132                 snprintf(name, sizeof(name), "%s-%s::assoc",
 133                          rt2x00dev->ops->name, phy_name);
 134
 135                 retval = rt2x00leds_register_led(rt2x00dev,
 136                                                  &rt2x00dev->led_assoc,
 137                                                  name);
 138                 if (retval)
 139                         goto exit_fail;
 140         }
 141
 142         if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
 143                 snprintf(name, sizeof(name), "%s-%s::quality",
 144                          rt2x00dev->ops->name, phy_name);
 145
 146                 retval = rt2x00leds_register_led(rt2x00dev,
 147                                                  &rt2x00dev->led_qual,
 148                                                  name);
 149                 if (retval)
 150                         goto exit_fail;
 151         }
 152
 153         /*
 154          * Initialize blink time to default value:
 155          * On period: 70ms
 156          * Off period: 30ms
 157          */
 158         if (rt2x00dev->led_radio.led_dev.blink_set) {
 159                 on_period = 70;
 160                 off_period = 30;
 161                 rt2x00dev->led_radio.led_dev.blink_set(
 162                     &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
 163         }
 164
 165         return;
 166
 167 exit_fail:
 168         rt2x00leds_unregister(rt2x00dev);
 169 }
 170
 171 static void rt2x00leds_unregister_led(struct rt2x00_led *led)
 172 {
 173         led_classdev_unregister(&led->led_dev);
 174
 175         /*
 176          * This might look weird, but when we are unregistering while
 177          * suspended the led is already off, and since we haven't
 178          * fully resumed yet, access to the device might not be
 179          * possible yet.
 180          */
 181         if (!(led->led_dev.flags & LED_SUSPENDED))
 182                 led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 183
 184         led->flags &= ~LED_REGISTERED;
 185 }
 186
 187 void rt2x00leds_unregister(struct rt2x00_dev *rt2x00dev)
 188 {
 189         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 190                 rt2x00leds_unregister_led(&rt2x00dev->led_qual);
 191         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 192                 rt2x00leds_unregister_led(&rt2x00dev->led_assoc);
 193         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 194                 rt2x00leds_unregister_led(&rt2x00dev->led_radio);
 195 }
 196
 197 static inline void rt2x00leds_suspend_led(struct rt2x00_led *led)
 198 {
 199         led_classdev_suspend(&led->led_dev);
 200
 201         /* This shouldn't be needed, but just to be safe */
 202         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 203         led->led_dev.brightness = LED_OFF;
 204 }
 205
 206 void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
 207 {
 208         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 209                 rt2x00leds_suspend_led(&rt2x00dev->led_qual);
 210         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 211                 rt2x00leds_suspend_led(&rt2x00dev->led_assoc);
 212         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 213                 rt2x00leds_suspend_led(&rt2x00dev->led_radio);
 214 }
 215
 216 static inline void rt2x00leds_resume_led(struct rt2x00_led *led)
 217 {
 218         led_classdev_resume(&led->led_dev);
 219
 220         /* Device might have enabled the LEDS during resume */
 221         led->led_dev.brightness_set(&led->led_dev, LED_OFF);
 222         led->led_dev.brightness = LED_OFF;
 223 }
 224
 225 void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
 226 {
 227         if (rt2x00dev->led_radio.flags & LED_REGISTERED)
 228                 rt2x00leds_resume_led(&rt2x00dev->led_radio);
 229         if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
 230                 rt2x00leds_resume_led(&rt2x00dev->led_assoc);
 231         if (rt2x00dev->led_qual.flags & LED_REGISTERED)
 232                 rt2x00leds_resume_led(&rt2x00dev->led_qual);
 233 }