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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 = 0;
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 = 0;
229 switch (led_index) {
230 case 0:
231 *behaviour = B43_LED_ACTIVITY;
232 *activelow = 1;
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 = 1;
271 atomic_set(&led->state, 1);
272 } else {
273 b43_led_turn_off(dev, led->index, led->activelow);
274 led->hw_state = 0;
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 = 0;
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 = 0;
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 = 0;
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}