b43: bus: abstract R/W operations
[pandora-kernel.git] / drivers / net / wireless / b43 / leds.c
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 <mb@bu3sch.de>
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
34 static 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
47 static 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
60 static 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
88 static 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
104 out_unlock:
105         mutex_unlock(&wl->mutex);
106 }
107
108 /* Callback from the LED subsystem. */
109 static 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
121 static 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->sdev->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
151 static 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
159 static 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
213 static 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         struct ssb_bus *bus = dev->sdev->bus;
219         u8 sprom[4];
220
221         sprom[0] = bus->sprom.gpio0;
222         sprom[1] = bus->sprom.gpio1;
223         sprom[2] = bus->sprom.gpio2;
224         sprom[3] = bus->sprom.gpio3;
225
226         if (sprom[led_index] == 0xFF) {
227                 /* There is no LED information in the SPROM
228                  * for this LED. Hardcode it here. */
229                 *activelow = 0;
230                 switch (led_index) {
231                 case 0:
232                         *behaviour = B43_LED_ACTIVITY;
233                         *activelow = 1;
234                         if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
235                                 *behaviour = B43_LED_RADIO_ALL;
236                         break;
237                 case 1:
238                         *behaviour = B43_LED_RADIO_B;
239                         if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
240                                 *behaviour = B43_LED_ASSOC;
241                         break;
242                 case 2:
243                         *behaviour = B43_LED_RADIO_A;
244                         break;
245                 case 3:
246                         *behaviour = B43_LED_OFF;
247                         break;
248                 default:
249                         *behaviour = B43_LED_OFF;
250                         B43_WARN_ON(1);
251                         return;
252                 }
253         } else {
254                 *behaviour = sprom[led_index] & B43_LED_BEHAVIOUR;
255                 *activelow = !!(sprom[led_index] & B43_LED_ACTIVELOW);
256         }
257 }
258
259 void b43_leds_init(struct b43_wldev *dev)
260 {
261         struct b43_led *led;
262         unsigned int i;
263         enum b43_led_behaviour behaviour;
264         bool activelow;
265
266         /* Sync the RF-kill LED state (if we have one) with radio and switch states. */
267         led = &dev->wl->leds.led_radio;
268         if (led->wl) {
269                 if (dev->phy.radio_on && b43_is_hw_radio_enabled(dev)) {
270                         b43_led_turn_on(dev, led->index, led->activelow);
271                         led->hw_state = 1;
272                         atomic_set(&led->state, 1);
273                 } else {
274                         b43_led_turn_off(dev, led->index, led->activelow);
275                         led->hw_state = 0;
276                         atomic_set(&led->state, 0);
277                 }
278         }
279
280         /* Initialize TX/RX/ASSOC leds */
281         led = &dev->wl->leds.led_tx;
282         if (led->wl) {
283                 b43_led_turn_off(dev, led->index, led->activelow);
284                 led->hw_state = 0;
285                 atomic_set(&led->state, 0);
286         }
287         led = &dev->wl->leds.led_rx;
288         if (led->wl) {
289                 b43_led_turn_off(dev, led->index, led->activelow);
290                 led->hw_state = 0;
291                 atomic_set(&led->state, 0);
292         }
293         led = &dev->wl->leds.led_assoc;
294         if (led->wl) {
295                 b43_led_turn_off(dev, led->index, led->activelow);
296                 led->hw_state = 0;
297                 atomic_set(&led->state, 0);
298         }
299
300         /* Initialize other LED states. */
301         for (i = 0; i < B43_MAX_NR_LEDS; i++) {
302                 b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
303                 switch (behaviour) {
304                 case B43_LED_OFF:
305                         b43_led_turn_off(dev, i, activelow);
306                         break;
307                 case B43_LED_ON:
308                         b43_led_turn_on(dev, i, activelow);
309                         break;
310                 default:
311                         /* Leave others as-is. */
312                         break;
313                 }
314         }
315
316         dev->wl->leds.stop = 0;
317 }
318
319 void b43_leds_exit(struct b43_wldev *dev)
320 {
321         struct b43_leds *leds = &dev->wl->leds;
322
323         b43_led_turn_off(dev, leds->led_tx.index, leds->led_tx.activelow);
324         b43_led_turn_off(dev, leds->led_rx.index, leds->led_rx.activelow);
325         b43_led_turn_off(dev, leds->led_assoc.index, leds->led_assoc.activelow);
326         b43_led_turn_off(dev, leds->led_radio.index, leds->led_radio.activelow);
327 }
328
329 void b43_leds_stop(struct b43_wldev *dev)
330 {
331         struct b43_leds *leds = &dev->wl->leds;
332
333         leds->stop = 1;
334         cancel_work_sync(&leds->work);
335 }
336
337 void b43_leds_register(struct b43_wldev *dev)
338 {
339         unsigned int i;
340         enum b43_led_behaviour behaviour;
341         bool activelow;
342
343         INIT_WORK(&dev->wl->leds.work, b43_leds_work);
344
345         /* Register the LEDs to the LED subsystem. */
346         for (i = 0; i < B43_MAX_NR_LEDS; i++) {
347                 b43_led_get_sprominfo(dev, i, &behaviour, &activelow);
348                 b43_map_led(dev, i, behaviour, activelow);
349         }
350 }
351
352 void b43_leds_unregister(struct b43_wl *wl)
353 {
354         struct b43_leds *leds = &wl->leds;
355
356         b43_unregister_led(&leds->led_tx);
357         b43_unregister_led(&leds->led_rx);
358         b43_unregister_led(&leds->led_assoc);
359         b43_unregister_led(&leds->led_radio);
360 }