1/*
2
3  Broadcom B43 wireless driver
4  LED control
5
6  Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
7  Copyright (c) 2005 Stefano Brivio <stefano.brivio@polimi.it>
8  Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
9  Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
10  Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
11
12  This program is free software; you can redistribute it and/or modify
13  it under the terms of the GNU General Public License as published by
14  the Free Software Foundation; either version 2 of the License, or
15  (at your option) any later version.
16
17  This program is distributed in the hope that it will be useful,
18  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  GNU General Public License for more details.
21
22  You should have received a copy of the GNU General Public License
23  along with this program; see the file COPYING.  If not, write to
24  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
25  Boston, MA 02110-1301, USA.
26
27*/
28
29#include "b43.h"
30#include "leds.h"
31#include "rfkill.h"
32
33
34static void b43_led_turn_on(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
47static void b43_led_turn_off(struct b43_wldev *dev, u8 led_index,
48			     bool activelow)
49{
50	u16 ctl;
51
52	ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
53	if (activelow)
54		ctl |= (1 << led_index);
55	else
56		ctl &= ~(1 << led_index);
57	b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
58}
59
60static void b43_led_update(struct b43_wldev *dev,
61			   struct b43_led *led)
62{
63	bool radio_enabled;
64	bool turn_on;
65
66	if (!led->wl)
67		return;
68
69	radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
70
71	/* The led->state read is racy, but we don't care. In case we raced
72	 * with the brightness_set handler, we will be called again soon
73	 * to fixup our state. */
74	if (radio_enabled)
75		turn_on = atomic_read(&led->state) != LED_OFF;
76	else
77		turn_on = false;
78	if (turn_on == led->hw_state)
79		return;
80	led->hw_state = turn_on;
81
82	if (turn_on)
83		b43_led_turn_on(dev, led->index, led->activelow);
84	else
85		b43_led_turn_off(dev, led->index, led->activelow);
86}
87
88static void b43_leds_work(struct work_struct *work)
89{
90	struct b43_leds *leds = container_of(work, struct b43_leds, work);
91	struct b43_wl *wl = container_of(leds, struct b43_wl, leds);
92	struct b43_wldev *dev;
93
94	mutex_lock(&wl->mutex);
95	dev = wl->current_dev;
96	if (unlikely(!dev || b43_status(dev) < B43_STAT_STARTED))
97		goto out_unlock;
98
99	b43_led_update(dev, &wl->leds.led_tx);
100	b43_led_update(dev, &wl->leds.led_rx);
101	b43_led_update(dev, &wl->leds.led_radio);
102	b43_led_update(dev, &wl->leds.led_assoc);
103
104out_unlock:
105	mutex_unlock(&wl->mutex);
106}
107
108/* Callback from the LED subsystem. */
109static void b43_led_brightness_set(struct led_classdev *led_dev,
110				   enum led_brightness brightness)
111{
112	struct b43_led *led = container_of(led_dev, struct b43_led, led_dev);
113	struct b43_wl *wl = led->wl;
114
115	if (likely(!wl->leds.stop)) {
116		atomic_set(&led->state, brightness);
117		ieee80211_queue_work(wl->hw, &wl->leds.work);
118	}
119}
120
121static int b43_register_led(struct b43_wldev *dev, struct b43_led *led,
122			    const char *name, const char *default_trigger,
123			    u8 led_index, bool activelow)
124{
125	int err;
126
127	if (led->wl)
128		return -EEXIST;
129	if (!default_trigger)
130		return -EINVAL;
131	led->wl = dev->wl;
132	led->index = led_index;
133	led->activelow = activelow;
134	strncpy(led->name, name, sizeof(led->name));
135	atomic_set(&led->state, 0);
136
137	led->led_dev.name = led->name;
138	led->led_dev.default_trigger = default_trigger;
139	led->led_dev.brightness_set = b43_led_brightness_set;
140
141	err = led_classdev_register(dev->dev->dev, &led->led_dev);
142	if (err) {
143		b43warn(dev->wl, "LEDs: Failed to register %s\n", name);
144		led->wl = NULL;
145		return err;
146	}
147
148	return 0;
149}
150
151static void b43_unregister_led(struct b43_led *led)
152{
153	if (!led->wl)
154		return;
155	led_classdev_unregister(&led->led_dev);
156	led->wl = NULL;
157}
158
159static void b43_map_led(struct b43_wldev *dev,
160			u8 led_index,
161			enum b43_led_behaviour behaviour,
162			bool activelow)
163{
164	struct ieee80211_hw *hw = dev->wl->hw;
165	char name[B43_LED_MAX_NAME_LEN + 1];
166
167	/* Map the b43 specific LED behaviour value to the
168	 * generic LED triggers. */
169	switch (behaviour) {
170	case B43_LED_INACTIVE:
171	case B43_LED_OFF:
172	case B43_LED_ON:
173		break;
174	case B43_LED_ACTIVITY:
175	case B43_LED_TRANSFER:
176	case B43_LED_APTRANSFER:
177		snprintf(name, sizeof(name),
178			 "b43-%s::tx", wiphy_name(hw->wiphy));
179		b43_register_led(dev, &dev->wl->leds.led_tx, name,
180				 ieee80211_get_tx_led_name(hw),
181				 led_index, activelow);
182		snprintf(name, sizeof(name),
183			 "b43-%s::rx", wiphy_name(hw->wiphy));
184		b43_register_led(dev, &dev->wl->leds.led_rx, name,
185				 ieee80211_get_rx_led_name(hw),
186				 led_index, activelow);
187		break;
188	case B43_LED_RADIO_ALL:
189	case B43_LED_RADIO_A:
190	case B43_LED_RADIO_B:
191	case B43_LED_MODE_BG:
192		snprintf(name, sizeof(name),
193			 "b43-%s::radio", wiphy_name(hw->wiphy));
194		b43_register_led(dev, &dev->wl->leds.led_radio, name,
195				 ieee80211_get_radio_led_name(hw),
196				 led_index, activelow);
197		break;
198	case B43_LED_WEIRD:
199	case B43_LED_ASSOC:
200		snprintf(name, sizeof(name),
201			 "b43-%s::assoc", wiphy_name(hw->wiphy));
202		b43_register_led(dev, &dev->wl->leds.led_assoc, name,
203				 ieee80211_get_assoc_led_name(hw),
204				 led_index, activelow);
205		break;
206	default:
207		b43warn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
208			behaviour);
209		break;
210	}
211}
212
213static void b43_led_get_sprominfo(struct b43_wldev *dev,
214				  unsigned int led_index,
215				  enum b43_led_behaviour *behaviour,
216				  bool *activelow)
217{
218	u8 sprom[4];
219
220	sprom[0] = dev->dev->bus_sprom->gpio0;
221	sprom[1] = dev->dev->bus_sprom->gpio1;
222	sprom[2] = dev->dev->bus_sprom->gpio2;
223	sprom[3] = dev->dev->bus_sprom->gpio3;
224
225	if (sprom[led_index] == 0xFF) {
226		/* There is no LED information in the SPROM
227		 * for this LED. Hardcode it here. */
228		*activelow = false;
229		switch (led_index) {
230		case 0:
231			*behaviour = B43_LED_ACTIVITY;
232			*activelow = true;
233			if (dev->dev->board_vendor == PCI_VENDOR_ID_COMPAQ)
234				*behaviour = B43_LED_RADIO_ALL;
235			break;
236		case 1:
237			*behaviour = B43_LED_RADIO_B;
238			if (dev->dev->board_vendor == PCI_VENDOR_ID_ASUSTEK)
239				*behaviour = B43_LED_ASSOC;
240			break;
241		case 2:
242			*behaviour = B43_LED_RADIO_A;
243			break;
244		case 3:
245			*behaviour = B43_LED_OFF;
246			break;
247		default:
248			*behaviour = B43_LED_OFF;
249			B43_WARN_ON(1);
250			return;
251		}
252	} else {
253		*behaviour = sprom[led_index] & B43_LED_BEHAVIOUR;
254		*activelow = !!(sprom[led_index] & B43_LED_ACTIVELOW);
255	}
256}
257
258void b43_leds_init(struct b43_wldev *dev)
259{
260	struct b43_led *led;
261	unsigned int i;
262	enum b43_led_behaviour behaviour;
263	bool activelow;
264
265	/* Sync the RF-kill LED state (if we have one) with radio and switch states. */
266	led = &dev->wl->leds.led_radio;
267	if (led->wl) {
268		if (dev->phy.radio_on && b43_is_hw_radio_enabled(dev)) {
269			b43_led_turn_on(dev, led->index, led->activelow);
270			led->hw_state = true;
271			atomic_set(&led->state, 1);
272		} else {
273			b43_led_turn_off(dev, led->index, led->activelow);
274			led->hw_state = false;
275			atomic_set(&led->state, 0);
276		}
277	}
278
279	/* Initialize TX/RX/ASSOC leds */
280	led = &dev->wl->leds.led_tx;
281	if (led->wl) {
282		b43_led_turn_off(dev, led->index, led->activelow);
283		led->hw_state = false;
284		atomic_set(&led->state, 0);
285	}
286	led = &dev->wl->leds.led_rx;
287	if (led->wl) {
288		b43_led_turn_off(dev, led->index, led->activelow);
289		led->hw_state = false;
290		atomic_set(&led->state, 0);
291	}
292	led = &dev->wl->leds.led_assoc;
293	if (led->wl) {
294		b43_led_turn_off(dev, led->index, led->activelow);
295		led->hw_state = false;
296		atomic_set(&led->state, 0);
297	}
298
299	/* Initialize other LED states. */
300	for (i = 0; i < B43_MAX_NR_LEDS; i++) {
301		b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
302		switch (behaviour) {
303		case B43_LED_OFF:
304			b43_led_turn_off(dev, i, activelow);
305			break;
306		case B43_LED_ON:
307			b43_led_turn_on(dev, i, activelow);
308			break;
309		default:
310			/* Leave others as-is. */
311			break;
312		}
313	}
314
315	dev->wl->leds.stop = 0;
316}
317
318void b43_leds_exit(struct b43_wldev *dev)
319{
320	struct b43_leds *leds = &dev->wl->leds;
321
322	b43_led_turn_off(dev, leds->led_tx.index, leds->led_tx.activelow);
323	b43_led_turn_off(dev, leds->led_rx.index, leds->led_rx.activelow);
324	b43_led_turn_off(dev, leds->led_assoc.index, leds->led_assoc.activelow);
325	b43_led_turn_off(dev, leds->led_radio.index, leds->led_radio.activelow);
326}
327
328void b43_leds_stop(struct b43_wldev *dev)
329{
330	struct b43_leds *leds = &dev->wl->leds;
331
332	leds->stop = 1;
333	cancel_work_sync(&leds->work);
334}
335
336void b43_leds_register(struct b43_wldev *dev)
337{
338	unsigned int i;
339	enum b43_led_behaviour behaviour;
340	bool activelow;
341
342	INIT_WORK(&dev->wl->leds.work, b43_leds_work);
343
344	/* Register the LEDs to the LED subsystem. */
345	for (i = 0; i < B43_MAX_NR_LEDS; i++) {
346		b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
347		b43_map_led(dev, i, behaviour, activelow);
348	}
349}
350
351void b43_leds_unregister(struct b43_wl *wl)
352{
353	struct b43_leds *leds = &wl->leds;
354
355	b43_unregister_led(&leds->led_tx);
356	b43_unregister_led(&leds->led_rx);
357	b43_unregister_led(&leds->led_assoc);
358	b43_unregister_led(&leds->led_radio);
359}
360