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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 "b43.h"
0017 #include "leds.h"
0018 #include "rfkill.h"
0019 
0020 
0021 static void b43_led_turn_on(struct b43_wldev *dev, u8 led_index,
0022                 bool activelow)
0023 {
0024     u16 ctl;
0025 
0026     ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
0027     if (activelow)
0028         ctl &= ~(1 << led_index);
0029     else
0030         ctl |= (1 << led_index);
0031     b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
0032 }
0033 
0034 static void b43_led_turn_off(struct b43_wldev *dev, u8 led_index,
0035                  bool activelow)
0036 {
0037     u16 ctl;
0038 
0039     ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
0040     if (activelow)
0041         ctl |= (1 << led_index);
0042     else
0043         ctl &= ~(1 << led_index);
0044     b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
0045 }
0046 
0047 static void b43_led_update(struct b43_wldev *dev,
0048                struct b43_led *led)
0049 {
0050     bool radio_enabled;
0051     bool turn_on;
0052 
0053     if (!led->wl)
0054         return;
0055 
0056     radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
0057 
0058     /* The led->state read is racy, but we don't care. In case we raced
0059      * with the brightness_set handler, we will be called again soon
0060      * to fixup our state. */
0061     if (radio_enabled)
0062         turn_on = atomic_read(&led->state) != LED_OFF;
0063     else
0064         turn_on = false;
0065     if (turn_on == led->hw_state)
0066         return;
0067     led->hw_state = turn_on;
0068 
0069     if (turn_on)
0070         b43_led_turn_on(dev, led->index, led->activelow);
0071     else
0072         b43_led_turn_off(dev, led->index, led->activelow);
0073 }
0074 
0075 static void b43_leds_work(struct work_struct *work)
0076 {
0077     struct b43_leds *leds = container_of(work, struct b43_leds, work);
0078     struct b43_wl *wl = container_of(leds, struct b43_wl, leds);
0079     struct b43_wldev *dev;
0080 
0081     mutex_lock(&wl->mutex);
0082     dev = wl->current_dev;
0083     if (unlikely(!dev || b43_status(dev) < B43_STAT_STARTED))
0084         goto out_unlock;
0085 
0086     b43_led_update(dev, &wl->leds.led_tx);
0087     b43_led_update(dev, &wl->leds.led_rx);
0088     b43_led_update(dev, &wl->leds.led_radio);
0089     b43_led_update(dev, &wl->leds.led_assoc);
0090 
0091 out_unlock:
0092     mutex_unlock(&wl->mutex);
0093 }
0094 
0095 /* Callback from the LED subsystem. */
0096 static void b43_led_brightness_set(struct led_classdev *led_dev,
0097                    enum led_brightness brightness)
0098 {
0099     struct b43_led *led = container_of(led_dev, struct b43_led, led_dev);
0100     struct b43_wl *wl = led->wl;
0101 
0102     if (likely(!wl->leds.stop)) {
0103         atomic_set(&led->state, brightness);
0104         ieee80211_queue_work(wl->hw, &wl->leds.work);
0105     }
0106 }
0107 
0108 static int b43_register_led(struct b43_wldev *dev, struct b43_led *led,
0109                 const char *name, const char *default_trigger,
0110                 u8 led_index, bool activelow)
0111 {
0112     int err;
0113 
0114     if (led->wl)
0115         return -EEXIST;
0116     if (!default_trigger)
0117         return -EINVAL;
0118     led->wl = dev->wl;
0119     led->index = led_index;
0120     led->activelow = activelow;
0121     strlcpy(led->name, name, sizeof(led->name));
0122     atomic_set(&led->state, 0);
0123 
0124     led->led_dev.name = led->name;
0125     led->led_dev.default_trigger = default_trigger;
0126     led->led_dev.brightness_set = b43_led_brightness_set;
0127 
0128     err = led_classdev_register(dev->dev->dev, &led->led_dev);
0129     if (err) {
0130         b43warn(dev->wl, "LEDs: Failed to register %s\n", name);
0131         led->wl = NULL;
0132         return err;
0133     }
0134 
0135     return 0;
0136 }
0137 
0138 static void b43_unregister_led(struct b43_led *led)
0139 {
0140     if (!led->wl)
0141         return;
0142     led_classdev_unregister(&led->led_dev);
0143     led->wl = NULL;
0144 }
0145 
0146 static void b43_map_led(struct b43_wldev *dev,
0147             u8 led_index,
0148             enum b43_led_behaviour behaviour,
0149             bool activelow)
0150 {
0151     struct ieee80211_hw *hw = dev->wl->hw;
0152     char name[B43_LED_MAX_NAME_LEN + 1];
0153 
0154     /* Map the b43 specific LED behaviour value to the
0155      * generic LED triggers. */
0156     switch (behaviour) {
0157     case B43_LED_INACTIVE:
0158     case B43_LED_OFF:
0159     case B43_LED_ON:
0160         break;
0161     case B43_LED_ACTIVITY:
0162     case B43_LED_TRANSFER:
0163     case B43_LED_APTRANSFER:
0164         snprintf(name, sizeof(name),
0165              "b43-%s::tx", wiphy_name(hw->wiphy));
0166         b43_register_led(dev, &dev->wl->leds.led_tx, name,
0167                  ieee80211_get_tx_led_name(hw),
0168                  led_index, activelow);
0169         snprintf(name, sizeof(name),
0170              "b43-%s::rx", wiphy_name(hw->wiphy));
0171         b43_register_led(dev, &dev->wl->leds.led_rx, name,
0172                  ieee80211_get_rx_led_name(hw),
0173                  led_index, activelow);
0174         break;
0175     case B43_LED_RADIO_ALL:
0176     case B43_LED_RADIO_A:
0177     case B43_LED_RADIO_B:
0178     case B43_LED_MODE_BG:
0179         snprintf(name, sizeof(name),
0180              "b43-%s::radio", wiphy_name(hw->wiphy));
0181         b43_register_led(dev, &dev->wl->leds.led_radio, name,
0182                  ieee80211_get_radio_led_name(hw),
0183                  led_index, activelow);
0184         break;
0185     case B43_LED_WEIRD:
0186     case B43_LED_ASSOC:
0187         snprintf(name, sizeof(name),
0188              "b43-%s::assoc", wiphy_name(hw->wiphy));
0189         b43_register_led(dev, &dev->wl->leds.led_assoc, name,
0190                  ieee80211_get_assoc_led_name(hw),
0191                  led_index, activelow);
0192         break;
0193     default:
0194         b43warn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
0195             behaviour);
0196         break;
0197     }
0198 }
0199 
0200 static void b43_led_get_sprominfo(struct b43_wldev *dev,
0201                   unsigned int led_index,
0202                   enum b43_led_behaviour *behaviour,
0203                   bool *activelow)
0204 {
0205     u8 sprom[4];
0206 
0207     sprom[0] = dev->dev->bus_sprom->gpio0;
0208     sprom[1] = dev->dev->bus_sprom->gpio1;
0209     sprom[2] = dev->dev->bus_sprom->gpio2;
0210     sprom[3] = dev->dev->bus_sprom->gpio3;
0211 
0212     if ((sprom[0] & sprom[1] & sprom[2] & sprom[3]) == 0xff) {
0213         /* There is no LED information in the SPROM
0214          * for this LED. Hardcode it here. */
0215         *activelow = false;
0216         switch (led_index) {
0217         case 0:
0218             *behaviour = B43_LED_ACTIVITY;
0219             *activelow = true;
0220             if (dev->dev->board_vendor == PCI_VENDOR_ID_COMPAQ)
0221                 *behaviour = B43_LED_RADIO_ALL;
0222             break;
0223         case 1:
0224             *behaviour = B43_LED_RADIO_B;
0225             if (dev->dev->board_vendor == PCI_VENDOR_ID_ASUSTEK)
0226                 *behaviour = B43_LED_ASSOC;
0227             break;
0228         case 2:
0229             *behaviour = B43_LED_RADIO_A;
0230             break;
0231         case 3:
0232             *behaviour = B43_LED_OFF;
0233             break;
0234         default:
0235             *behaviour = B43_LED_OFF;
0236             B43_WARN_ON(1);
0237             return;
0238         }
0239     } else {
0240         /* keep LED disabled if no mapping is defined */
0241         if (sprom[led_index] == 0xff)
0242             *behaviour = B43_LED_OFF;
0243         else
0244             *behaviour = sprom[led_index] & B43_LED_BEHAVIOUR;
0245         *activelow = !!(sprom[led_index] & B43_LED_ACTIVELOW);
0246     }
0247 }
0248 
0249 void b43_leds_init(struct b43_wldev *dev)
0250 {
0251     struct b43_led *led;
0252     unsigned int i;
0253     enum b43_led_behaviour behaviour;
0254     bool activelow;
0255 
0256     /* Sync the RF-kill LED state (if we have one) with radio and switch states. */
0257     led = &dev->wl->leds.led_radio;
0258     if (led->wl) {
0259         if (dev->phy.radio_on && b43_is_hw_radio_enabled(dev)) {
0260             b43_led_turn_on(dev, led->index, led->activelow);
0261             led->hw_state = true;
0262             atomic_set(&led->state, 1);
0263         } else {
0264             b43_led_turn_off(dev, led->index, led->activelow);
0265             led->hw_state = false;
0266             atomic_set(&led->state, 0);
0267         }
0268     }
0269 
0270     /* Initialize TX/RX/ASSOC leds */
0271     led = &dev->wl->leds.led_tx;
0272     if (led->wl) {
0273         b43_led_turn_off(dev, led->index, led->activelow);
0274         led->hw_state = false;
0275         atomic_set(&led->state, 0);
0276     }
0277     led = &dev->wl->leds.led_rx;
0278     if (led->wl) {
0279         b43_led_turn_off(dev, led->index, led->activelow);
0280         led->hw_state = false;
0281         atomic_set(&led->state, 0);
0282     }
0283     led = &dev->wl->leds.led_assoc;
0284     if (led->wl) {
0285         b43_led_turn_off(dev, led->index, led->activelow);
0286         led->hw_state = false;
0287         atomic_set(&led->state, 0);
0288     }
0289 
0290     /* Initialize other LED states. */
0291     for (i = 0; i < B43_MAX_NR_LEDS; i++) {
0292         b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
0293         switch (behaviour) {
0294         case B43_LED_OFF:
0295             b43_led_turn_off(dev, i, activelow);
0296             break;
0297         case B43_LED_ON:
0298             b43_led_turn_on(dev, i, activelow);
0299             break;
0300         default:
0301             /* Leave others as-is. */
0302             break;
0303         }
0304     }
0305 
0306     dev->wl->leds.stop = 0;
0307 }
0308 
0309 void b43_leds_exit(struct b43_wldev *dev)
0310 {
0311     struct b43_leds *leds = &dev->wl->leds;
0312 
0313     b43_led_turn_off(dev, leds->led_tx.index, leds->led_tx.activelow);
0314     b43_led_turn_off(dev, leds->led_rx.index, leds->led_rx.activelow);
0315     b43_led_turn_off(dev, leds->led_assoc.index, leds->led_assoc.activelow);
0316     b43_led_turn_off(dev, leds->led_radio.index, leds->led_radio.activelow);
0317 }
0318 
0319 void b43_leds_stop(struct b43_wldev *dev)
0320 {
0321     struct b43_leds *leds = &dev->wl->leds;
0322 
0323     leds->stop = 1;
0324     cancel_work_sync(&leds->work);
0325 }
0326 
0327 void b43_leds_register(struct b43_wldev *dev)
0328 {
0329     unsigned int i;
0330     enum b43_led_behaviour behaviour;
0331     bool activelow;
0332 
0333     INIT_WORK(&dev->wl->leds.work, b43_leds_work);
0334 
0335     /* Register the LEDs to the LED subsystem. */
0336     for (i = 0; i < B43_MAX_NR_LEDS; i++) {
0337         b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
0338         b43_map_led(dev, i, behaviour, activelow);
0339     }
0340 }
0341 
0342 void b43_leds_unregister(struct b43_wl *wl)
0343 {
0344     struct b43_leds *leds = &wl->leds;
0345 
0346     b43_unregister_led(&leds->led_tx);
0347     b43_unregister_led(&leds->led_rx);
0348     b43_unregister_led(&leds->led_assoc);
0349     b43_unregister_led(&leds->led_radio);
0350 }
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