Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / 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
32
33 static void b43_led_turn_on(struct b43_wldev *dev, u8 led_index,
34                             bool activelow)
35 {
36         struct b43_wl *wl = dev->wl;
37         unsigned long flags;
38         u16 ctl;
39
40         spin_lock_irqsave(&wl->leds_lock, flags);
41         ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
42         if (activelow)
43                 ctl &= ~(1 << led_index);
44         else
45                 ctl |= (1 << led_index);
46         b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
47         spin_unlock_irqrestore(&wl->leds_lock, flags);
48 }
49
50 static void b43_led_turn_off(struct b43_wldev *dev, u8 led_index,
51                              bool activelow)
52 {
53         struct b43_wl *wl = dev->wl;
54         unsigned long flags;
55         u16 ctl;
56
57         spin_lock_irqsave(&wl->leds_lock, flags);
58         ctl = b43_read16(dev, B43_MMIO_GPIO_CONTROL);
59         if (activelow)
60                 ctl |= (1 << led_index);
61         else
62                 ctl &= ~(1 << led_index);
63         b43_write16(dev, B43_MMIO_GPIO_CONTROL, ctl);
64         spin_unlock_irqrestore(&wl->leds_lock, flags);
65 }
66
67 /* Callback from the LED subsystem. */
68 static void b43_led_brightness_set(struct led_classdev *led_dev,
69                                    enum led_brightness brightness)
70 {
71         struct b43_led *led = container_of(led_dev, struct b43_led, led_dev);
72         struct b43_wldev *dev = led->dev;
73         bool radio_enabled;
74
75         if (unlikely(b43_status(dev) < B43_STAT_INITIALIZED))
76                 return;
77
78         /* Checking the radio-enabled status here is slightly racy,
79          * but we want to avoid the locking overhead and we don't care
80          * whether the LED has the wrong state for a second. */
81         radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
82
83         if (brightness == LED_OFF || !radio_enabled)
84                 b43_led_turn_off(dev, led->index, led->activelow);
85         else
86                 b43_led_turn_on(dev, led->index, led->activelow);
87 }
88
89 static int b43_register_led(struct b43_wldev *dev, struct b43_led *led,
90                             const char *name, char *default_trigger,
91                             u8 led_index, bool activelow)
92 {
93         int err;
94
95         b43_led_turn_off(dev, led_index, activelow);
96         if (led->dev)
97                 return -EEXIST;
98         if (!default_trigger)
99                 return -EINVAL;
100         led->dev = dev;
101         led->index = led_index;
102         led->activelow = activelow;
103         strncpy(led->name, name, sizeof(led->name));
104
105         led->led_dev.name = led->name;
106         led->led_dev.default_trigger = default_trigger;
107         led->led_dev.brightness_set = b43_led_brightness_set;
108
109         err = led_classdev_register(dev->dev->dev, &led->led_dev);
110         if (err) {
111                 b43warn(dev->wl, "LEDs: Failed to register %s\n", name);
112                 led->dev = NULL;
113                 return err;
114         }
115         return 0;
116 }
117
118 static void b43_unregister_led(struct b43_led *led)
119 {
120         if (!led->dev)
121                 return;
122         led_classdev_unregister(&led->led_dev);
123         b43_led_turn_off(led->dev, led->index, led->activelow);
124         led->dev = NULL;
125 }
126
127 static void b43_map_led(struct b43_wldev *dev,
128                         u8 led_index,
129                         enum b43_led_behaviour behaviour,
130                         bool activelow)
131 {
132         struct ieee80211_hw *hw = dev->wl->hw;
133         char name[B43_LED_MAX_NAME_LEN + 1];
134
135         /* Map the b43 specific LED behaviour value to the
136          * generic LED triggers. */
137         switch (behaviour) {
138         case B43_LED_INACTIVE:
139                 break;
140         case B43_LED_OFF:
141                 b43_led_turn_off(dev, led_index, activelow);
142                 break;
143         case B43_LED_ON:
144                 b43_led_turn_on(dev, led_index, activelow);
145                 break;
146         case B43_LED_ACTIVITY:
147         case B43_LED_TRANSFER:
148         case B43_LED_APTRANSFER:
149                 snprintf(name, sizeof(name),
150                          "b43-%s::tx", wiphy_name(hw->wiphy));
151                 b43_register_led(dev, &dev->led_tx, name,
152                                  ieee80211_get_tx_led_name(hw),
153                                  led_index, activelow);
154                 snprintf(name, sizeof(name),
155                          "b43-%s::rx", wiphy_name(hw->wiphy));
156                 b43_register_led(dev, &dev->led_rx, name,
157                                  ieee80211_get_rx_led_name(hw),
158                                  led_index, activelow);
159                 break;
160         case B43_LED_RADIO_ALL:
161         case B43_LED_RADIO_A:
162         case B43_LED_RADIO_B:
163         case B43_LED_MODE_BG:
164                 snprintf(name, sizeof(name),
165                          "b43-%s::radio", wiphy_name(hw->wiphy));
166                 b43_register_led(dev, &dev->led_radio, name,
167                                  b43_rfkill_led_name(dev),
168                                  led_index, activelow);
169                 /* Sync the RF-kill LED state with the switch state. */
170                 if (dev->radio_hw_enable)
171                         b43_led_turn_on(dev, led_index, activelow);
172                 break;
173         case B43_LED_WEIRD:
174         case B43_LED_ASSOC:
175                 snprintf(name, sizeof(name),
176                          "b43-%s::assoc", wiphy_name(hw->wiphy));
177                 b43_register_led(dev, &dev->led_assoc, name,
178                                  ieee80211_get_assoc_led_name(hw),
179                                  led_index, activelow);
180                 break;
181         default:
182                 b43warn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
183                         behaviour);
184                 break;
185         }
186 }
187
188 void b43_leds_init(struct b43_wldev *dev)
189 {
190         struct ssb_bus *bus = dev->dev->bus;
191         u8 sprom[4];
192         int i;
193         enum b43_led_behaviour behaviour;
194         bool activelow;
195
196         sprom[0] = bus->sprom.gpio0;
197         sprom[1] = bus->sprom.gpio1;
198         sprom[2] = bus->sprom.gpio2;
199         sprom[3] = bus->sprom.gpio3;
200
201         for (i = 0; i < 4; i++) {
202                 if (sprom[i] == 0xFF) {
203                         /* There is no LED information in the SPROM
204                          * for this LED. Hardcode it here. */
205                         activelow = 0;
206                         switch (i) {
207                         case 0:
208                                 behaviour = B43_LED_ACTIVITY;
209                                 activelow = 1;
210                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
211                                         behaviour = B43_LED_RADIO_ALL;
212                                 break;
213                         case 1:
214                                 behaviour = B43_LED_RADIO_B;
215                                 if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
216                                         behaviour = B43_LED_ASSOC;
217                                 break;
218                         case 2:
219                                 behaviour = B43_LED_RADIO_A;
220                                 break;
221                         case 3:
222                                 behaviour = B43_LED_OFF;
223                                 break;
224                         default:
225                                 B43_WARN_ON(1);
226                                 return;
227                         }
228                 } else {
229                         behaviour = sprom[i] & B43_LED_BEHAVIOUR;
230                         activelow = !!(sprom[i] & B43_LED_ACTIVELOW);
231                 }
232                 b43_map_led(dev, i, behaviour, activelow);
233         }
234 }
235
236 void b43_leds_exit(struct b43_wldev *dev)
237 {
238         b43_unregister_led(&dev->led_tx);
239         b43_unregister_led(&dev->led_rx);
240         b43_unregister_led(&dev->led_assoc);
241         b43_unregister_led(&dev->led_radio);
242 }