1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 4 Broadcom B43 wireless driver 5 LED control 6 7 Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>, 8 Copyright (c) 2005 Stefano Brivio <stefano.brivio@polimi.it> 9 Copyright (c) 2005-2007 Michael Buesch <m@bues.ch> 10 Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org> 11 Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch> 12 13 14 */ 15 16 #include "b43.h" 17 #include "leds.h" 18 #include "rfkill.h" 19 20 21 static void b43_led_turn_on(struct b43_wldev *dev, u8 led_index, 22 bool activelow) 23 { 24 u16 ctl; 25 26 ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL); 27 if (activelow) 28 ctl &= ~(1 << led_index); 29 else 30 ctl |= (1 << led_index); 31 b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl); 32 } 33 34 static void b43_led_turn_off(struct b43_wldev *dev, u8 led_index, 35 bool activelow) 36 { 37 u16 ctl; 38 39 ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL); 40 if (activelow) 41 ctl |= (1 << led_index); 42 else 43 ctl &= ~(1 << led_index); 44 b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl); 45 } 46 47 static void b43_led_update(struct b43_wldev *dev, 48 struct b43_led *led) 49 { 50 bool radio_enabled; 51 bool turn_on; 52 53 if (!led->wl) 54 return; 55 56 radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable); 57 58 /* The led->state read is racy, but we don't care. In case we raced 59 * with the brightness_set handler, we will be called again soon 60 * to fixup our state. */ 61 if (radio_enabled) 62 turn_on = atomic_read(&led->state) != LED_OFF; 63 else 64 turn_on = false; 65 if (turn_on == led->hw_state) 66 return; 67 led->hw_state = turn_on; 68 69 if (turn_on) 70 b43_led_turn_on(dev, led->index, led->activelow); 71 else 72 b43_led_turn_off(dev, led->index, led->activelow); 73 } 74 75 static void b43_leds_work(struct work_struct *work) 76 { 77 struct b43_leds *leds = container_of(work, struct b43_leds, work); 78 struct b43_wl *wl = container_of(leds, struct b43_wl, leds); 79 struct b43_wldev *dev; 80 81 mutex_lock(&wl->mutex); 82 dev = wl->current_dev; 83 if (unlikely(!dev || b43_status(dev) < B43_STAT_STARTED)) 84 goto out_unlock; 85 86 b43_led_update(dev, &wl->leds.led_tx); 87 b43_led_update(dev, &wl->leds.led_rx); 88 b43_led_update(dev, &wl->leds.led_radio); 89 b43_led_update(dev, &wl->leds.led_assoc); 90 91 out_unlock: 92 mutex_unlock(&wl->mutex); 93 } 94 95 /* Callback from the LED subsystem. */ 96 static void b43_led_brightness_set(struct led_classdev *led_dev, 97 enum led_brightness brightness) 98 { 99 struct b43_led *led = container_of(led_dev, struct b43_led, led_dev); 100 struct b43_wl *wl = led->wl; 101 102 if (likely(!wl->leds.stop)) { 103 atomic_set(&led->state, brightness); 104 ieee80211_queue_work(wl->hw, &wl->leds.work); 105 } 106 } 107 108 static int b43_register_led(struct b43_wldev *dev, struct b43_led *led, 109 const char *name, const char *default_trigger, 110 u8 led_index, bool activelow) 111 { 112 int err; 113 114 if (led->wl) 115 return -EEXIST; 116 if (!default_trigger) 117 return -EINVAL; 118 led->wl = dev->wl; 119 led->index = led_index; 120 led->activelow = activelow; 121 strscpy(led->name, name, sizeof(led->name)); 122 atomic_set(&led->state, 0); 123 124 led->led_dev.name = led->name; 125 led->led_dev.default_trigger = default_trigger; 126 led->led_dev.brightness_set = b43_led_brightness_set; 127 128 err = led_classdev_register(dev->dev->dev, &led->led_dev); 129 if (err) { 130 b43warn(dev->wl, "LEDs: Failed to register %s\n", name); 131 led->wl = NULL; 132 return err; 133 } 134 135 return 0; 136 } 137 138 static void b43_unregister_led(struct b43_led *led) 139 { 140 if (!led->wl) 141 return; 142 led_classdev_unregister(&led->led_dev); 143 led->wl = NULL; 144 } 145 146 static void b43_map_led(struct b43_wldev *dev, 147 u8 led_index, 148 enum b43_led_behaviour behaviour, 149 bool activelow) 150 { 151 struct ieee80211_hw *hw = dev->wl->hw; 152 char name[B43_LED_MAX_NAME_LEN + 1]; 153 154 /* Map the b43 specific LED behaviour value to the 155 * generic LED triggers. */ 156 switch (behaviour) { 157 case B43_LED_INACTIVE: 158 case B43_LED_OFF: 159 case B43_LED_ON: 160 break; 161 case B43_LED_ACTIVITY: 162 case B43_LED_TRANSFER: 163 case B43_LED_APTRANSFER: 164 snprintf(name, sizeof(name), 165 "b43-%s::tx", wiphy_name(hw->wiphy)); 166 b43_register_led(dev, &dev->wl->leds.led_tx, name, 167 ieee80211_get_tx_led_name(hw), 168 led_index, activelow); 169 snprintf(name, sizeof(name), 170 "b43-%s::rx", wiphy_name(hw->wiphy)); 171 b43_register_led(dev, &dev->wl->leds.led_rx, name, 172 ieee80211_get_rx_led_name(hw), 173 led_index, activelow); 174 break; 175 case B43_LED_RADIO_ALL: 176 case B43_LED_RADIO_A: 177 case B43_LED_RADIO_B: 178 case B43_LED_MODE_BG: 179 snprintf(name, sizeof(name), 180 "b43-%s::radio", wiphy_name(hw->wiphy)); 181 b43_register_led(dev, &dev->wl->leds.led_radio, name, 182 ieee80211_get_radio_led_name(hw), 183 led_index, activelow); 184 break; 185 case B43_LED_WEIRD: 186 case B43_LED_ASSOC: 187 snprintf(name, sizeof(name), 188 "b43-%s::assoc", wiphy_name(hw->wiphy)); 189 b43_register_led(dev, &dev->wl->leds.led_assoc, name, 190 ieee80211_get_assoc_led_name(hw), 191 led_index, activelow); 192 break; 193 default: 194 b43warn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n", 195 behaviour); 196 break; 197 } 198 } 199 200 static void b43_led_get_sprominfo(struct b43_wldev *dev, 201 unsigned int led_index, 202 enum b43_led_behaviour *behaviour, 203 bool *activelow) 204 { 205 u8 sprom[4]; 206 207 sprom[0] = dev->dev->bus_sprom->gpio0; 208 sprom[1] = dev->dev->bus_sprom->gpio1; 209 sprom[2] = dev->dev->bus_sprom->gpio2; 210 sprom[3] = dev->dev->bus_sprom->gpio3; 211 212 if ((sprom[0] & sprom[1] & sprom[2] & sprom[3]) == 0xff) { 213 /* There is no LED information in the SPROM 214 * for this LED. Hardcode it here. */ 215 *activelow = false; 216 switch (led_index) { 217 case 0: 218 *behaviour = B43_LED_ACTIVITY; 219 *activelow = true; 220 if (dev->dev->board_vendor == PCI_VENDOR_ID_COMPAQ) 221 *behaviour = B43_LED_RADIO_ALL; 222 break; 223 case 1: 224 *behaviour = B43_LED_RADIO_B; 225 if (dev->dev->board_vendor == PCI_VENDOR_ID_ASUSTEK) 226 *behaviour = B43_LED_ASSOC; 227 break; 228 case 2: 229 *behaviour = B43_LED_RADIO_A; 230 break; 231 case 3: 232 *behaviour = B43_LED_OFF; 233 break; 234 default: 235 *behaviour = B43_LED_OFF; 236 B43_WARN_ON(1); 237 return; 238 } 239 } else { 240 /* keep LED disabled if no mapping is defined */ 241 if (sprom[led_index] == 0xff) 242 *behaviour = B43_LED_OFF; 243 else 244 *behaviour = sprom[led_index] & B43_LED_BEHAVIOUR; 245 *activelow = !!(sprom[led_index] & B43_LED_ACTIVELOW); 246 } 247 } 248 249 void b43_leds_init(struct b43_wldev *dev) 250 { 251 struct b43_led *led; 252 unsigned int i; 253 enum b43_led_behaviour behaviour; 254 bool activelow; 255 256 /* Sync the RF-kill LED state (if we have one) with radio and switch states. */ 257 led = &dev->wl->leds.led_radio; 258 if (led->wl) { 259 if (dev->phy.radio_on && b43_is_hw_radio_enabled(dev)) { 260 b43_led_turn_on(dev, led->index, led->activelow); 261 led->hw_state = true; 262 atomic_set(&led->state, 1); 263 } else { 264 b43_led_turn_off(dev, led->index, led->activelow); 265 led->hw_state = false; 266 atomic_set(&led->state, 0); 267 } 268 } 269 270 /* Initialize TX/RX/ASSOC leds */ 271 led = &dev->wl->leds.led_tx; 272 if (led->wl) { 273 b43_led_turn_off(dev, led->index, led->activelow); 274 led->hw_state = false; 275 atomic_set(&led->state, 0); 276 } 277 led = &dev->wl->leds.led_rx; 278 if (led->wl) { 279 b43_led_turn_off(dev, led->index, led->activelow); 280 led->hw_state = false; 281 atomic_set(&led->state, 0); 282 } 283 led = &dev->wl->leds.led_assoc; 284 if (led->wl) { 285 b43_led_turn_off(dev, led->index, led->activelow); 286 led->hw_state = false; 287 atomic_set(&led->state, 0); 288 } 289 290 /* Initialize other LED states. */ 291 for (i = 0; i < B43_MAX_NR_LEDS; i++) { 292 b43_led_get_sprominfo(dev, i, &behaviour, &activelow); 293 switch (behaviour) { 294 case B43_LED_OFF: 295 b43_led_turn_off(dev, i, activelow); 296 break; 297 case B43_LED_ON: 298 b43_led_turn_on(dev, i, activelow); 299 break; 300 default: 301 /* Leave others as-is. */ 302 break; 303 } 304 } 305 306 dev->wl->leds.stop = 0; 307 } 308 309 void b43_leds_exit(struct b43_wldev *dev) 310 { 311 struct b43_leds *leds = &dev->wl->leds; 312 313 b43_led_turn_off(dev, leds->led_tx.index, leds->led_tx.activelow); 314 b43_led_turn_off(dev, leds->led_rx.index, leds->led_rx.activelow); 315 b43_led_turn_off(dev, leds->led_assoc.index, leds->led_assoc.activelow); 316 b43_led_turn_off(dev, leds->led_radio.index, leds->led_radio.activelow); 317 } 318 319 void b43_leds_stop(struct b43_wldev *dev) 320 { 321 struct b43_leds *leds = &dev->wl->leds; 322 323 leds->stop = 1; 324 cancel_work_sync(&leds->work); 325 } 326 327 void b43_leds_register(struct b43_wldev *dev) 328 { 329 unsigned int i; 330 enum b43_led_behaviour behaviour; 331 bool activelow; 332 333 INIT_WORK(&dev->wl->leds.work, b43_leds_work); 334 335 /* Register the LEDs to the LED subsystem. */ 336 for (i = 0; i < B43_MAX_NR_LEDS; i++) { 337 b43_led_get_sprominfo(dev, i, &behaviour, &activelow); 338 b43_map_led(dev, i, behaviour, activelow); 339 } 340 } 341 342 void b43_leds_unregister(struct b43_wl *wl) 343 { 344 struct b43_leds *leds = &wl->leds; 345 346 b43_unregister_led(&leds->led_tx); 347 b43_unregister_led(&leds->led_rx); 348 b43_unregister_led(&leds->led_assoc); 349 b43_unregister_led(&leds->led_radio); 350 } 351