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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003 
0004   Broadcom B43 wireless driver
0005   LED control
0006 
0007   Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
0008   Copyright (c) 2005 Stefano Brivio <stefano.brivio@polimi.it>
0009   Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
0010   Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
0011   Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
0012 
0013 
0014 */
0015 
0016 #include "b43legacy.h"
0017 #include "leds.h"
0018 #include "rfkill.h"
0019 
0020 
0021 static void b43legacy_led_turn_on(struct b43legacy_wldev *dev, u8 led_index,
0022                 bool activelow)
0023 {
0024     struct b43legacy_wl *wl = dev->wl;
0025     unsigned long flags;
0026     u16 ctl;
0027 
0028     spin_lock_irqsave(&wl->leds_lock, flags);
0029     ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
0030     if (activelow)
0031         ctl &= ~(1 << led_index);
0032     else
0033         ctl |= (1 << led_index);
0034     b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
0035     spin_unlock_irqrestore(&wl->leds_lock, flags);
0036 }
0037 
0038 static void b43legacy_led_turn_off(struct b43legacy_wldev *dev, u8 led_index,
0039                  bool activelow)
0040 {
0041     struct b43legacy_wl *wl = dev->wl;
0042     unsigned long flags;
0043     u16 ctl;
0044 
0045     spin_lock_irqsave(&wl->leds_lock, flags);
0046     ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
0047     if (activelow)
0048         ctl |= (1 << led_index);
0049     else
0050         ctl &= ~(1 << led_index);
0051     b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
0052     spin_unlock_irqrestore(&wl->leds_lock, flags);
0053 }
0054 
0055 /* Callback from the LED subsystem. */
0056 static void b43legacy_led_brightness_set(struct led_classdev *led_dev,
0057                    enum led_brightness brightness)
0058 {
0059     struct b43legacy_led *led = container_of(led_dev, struct b43legacy_led,
0060                     led_dev);
0061     struct b43legacy_wldev *dev = led->dev;
0062     bool radio_enabled;
0063 
0064     /* Checking the radio-enabled status here is slightly racy,
0065      * but we want to avoid the locking overhead and we don't care
0066      * whether the LED has the wrong state for a second. */
0067     radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
0068 
0069     if (brightness == LED_OFF || !radio_enabled)
0070         b43legacy_led_turn_off(dev, led->index, led->activelow);
0071     else
0072         b43legacy_led_turn_on(dev, led->index, led->activelow);
0073 }
0074 
0075 static int b43legacy_register_led(struct b43legacy_wldev *dev,
0076                   struct b43legacy_led *led,
0077                   const char *name,
0078                   const char *default_trigger,
0079                   u8 led_index, bool activelow)
0080 {
0081     int err;
0082 
0083     b43legacy_led_turn_off(dev, led_index, activelow);
0084     if (led->dev)
0085         return -EEXIST;
0086     if (!default_trigger)
0087         return -EINVAL;
0088     led->dev = dev;
0089     led->index = led_index;
0090     led->activelow = activelow;
0091     strlcpy(led->name, name, sizeof(led->name));
0092 
0093     led->led_dev.name = led->name;
0094     led->led_dev.default_trigger = default_trigger;
0095     led->led_dev.brightness_set = b43legacy_led_brightness_set;
0096 
0097     err = led_classdev_register(dev->dev->dev, &led->led_dev);
0098     if (err) {
0099         b43legacywarn(dev->wl, "LEDs: Failed to register %s\n", name);
0100         led->dev = NULL;
0101         return err;
0102     }
0103     return 0;
0104 }
0105 
0106 static void b43legacy_unregister_led(struct b43legacy_led *led)
0107 {
0108     if (!led->dev)
0109         return;
0110     led_classdev_unregister(&led->led_dev);
0111     b43legacy_led_turn_off(led->dev, led->index, led->activelow);
0112     led->dev = NULL;
0113 }
0114 
0115 static void b43legacy_map_led(struct b43legacy_wldev *dev,
0116             u8 led_index,
0117             enum b43legacy_led_behaviour behaviour,
0118             bool activelow)
0119 {
0120     struct ieee80211_hw *hw = dev->wl->hw;
0121     char name[B43legacy_LED_MAX_NAME_LEN + 1];
0122 
0123     /* Map the b43 specific LED behaviour value to the
0124      * generic LED triggers. */
0125     switch (behaviour) {
0126     case B43legacy_LED_INACTIVE:
0127         break;
0128     case B43legacy_LED_OFF:
0129         b43legacy_led_turn_off(dev, led_index, activelow);
0130         break;
0131     case B43legacy_LED_ON:
0132         b43legacy_led_turn_on(dev, led_index, activelow);
0133         break;
0134     case B43legacy_LED_ACTIVITY:
0135     case B43legacy_LED_TRANSFER:
0136     case B43legacy_LED_APTRANSFER:
0137         snprintf(name, sizeof(name),
0138              "b43legacy-%s::tx", wiphy_name(hw->wiphy));
0139         b43legacy_register_led(dev, &dev->led_tx, name,
0140                  ieee80211_get_tx_led_name(hw),
0141                  led_index, activelow);
0142         snprintf(name, sizeof(name),
0143              "b43legacy-%s::rx", wiphy_name(hw->wiphy));
0144         b43legacy_register_led(dev, &dev->led_rx, name,
0145                  ieee80211_get_rx_led_name(hw),
0146                  led_index, activelow);
0147         break;
0148     case B43legacy_LED_RADIO_ALL:
0149     case B43legacy_LED_RADIO_A:
0150     case B43legacy_LED_RADIO_B:
0151     case B43legacy_LED_MODE_BG:
0152         snprintf(name, sizeof(name),
0153              "b43legacy-%s::radio", wiphy_name(hw->wiphy));
0154         b43legacy_register_led(dev, &dev->led_radio, name,
0155                  ieee80211_get_radio_led_name(hw),
0156                  led_index, activelow);
0157         /* Sync the RF-kill LED state with radio and switch states. */
0158         if (dev->phy.radio_on && b43legacy_is_hw_radio_enabled(dev))
0159             b43legacy_led_turn_on(dev, led_index, activelow);
0160         break;
0161     case B43legacy_LED_WEIRD:
0162     case B43legacy_LED_ASSOC:
0163         snprintf(name, sizeof(name),
0164              "b43legacy-%s::assoc", wiphy_name(hw->wiphy));
0165         b43legacy_register_led(dev, &dev->led_assoc, name,
0166                  ieee80211_get_assoc_led_name(hw),
0167                  led_index, activelow);
0168         break;
0169     default:
0170         b43legacywarn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
0171             behaviour);
0172         break;
0173     }
0174 }
0175 
0176 void b43legacy_leds_init(struct b43legacy_wldev *dev)
0177 {
0178     struct ssb_bus *bus = dev->dev->bus;
0179     u8 sprom[4];
0180     int i;
0181     enum b43legacy_led_behaviour behaviour;
0182     bool activelow;
0183 
0184     sprom[0] = bus->sprom.gpio0;
0185     sprom[1] = bus->sprom.gpio1;
0186     sprom[2] = bus->sprom.gpio2;
0187     sprom[3] = bus->sprom.gpio3;
0188 
0189     for (i = 0; i < 4; i++) {
0190         if (sprom[i] == 0xFF) {
0191             /* There is no LED information in the SPROM
0192              * for this LED. Hardcode it here. */
0193             activelow = false;
0194             switch (i) {
0195             case 0:
0196                 behaviour = B43legacy_LED_ACTIVITY;
0197                 activelow = true;
0198                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
0199                     behaviour = B43legacy_LED_RADIO_ALL;
0200                 break;
0201             case 1:
0202                 behaviour = B43legacy_LED_RADIO_B;
0203                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
0204                     behaviour = B43legacy_LED_ASSOC;
0205                 break;
0206             case 2:
0207                 behaviour = B43legacy_LED_RADIO_A;
0208                 break;
0209             case 3:
0210                 behaviour = B43legacy_LED_OFF;
0211                 break;
0212             default:
0213                 B43legacy_WARN_ON(1);
0214                 return;
0215             }
0216         } else {
0217             behaviour = sprom[i] & B43legacy_LED_BEHAVIOUR;
0218             activelow = !!(sprom[i] & B43legacy_LED_ACTIVELOW);
0219         }
0220         b43legacy_map_led(dev, i, behaviour, activelow);
0221     }
0222 }
0223 
0224 void b43legacy_leds_exit(struct b43legacy_wldev *dev)
0225 {
0226     b43legacy_unregister_led(&dev->led_tx);
0227     b43legacy_unregister_led(&dev->led_rx);
0228     b43legacy_unregister_led(&dev->led_assoc);
0229     b43legacy_unregister_led(&dev->led_radio);
0230 }
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