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