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 "b43legacy.h"
17 #include "leds.h"
18 #include "rfkill.h"
19
20
b43legacy_led_turn_on(struct b43legacy_wldev * dev,u8 led_index,bool activelow)21 static void b43legacy_led_turn_on(struct b43legacy_wldev *dev, u8 led_index,
22 bool activelow)
23 {
24 struct b43legacy_wl *wl = dev->wl;
25 unsigned long flags;
26 u16 ctl;
27
28 spin_lock_irqsave(&wl->leds_lock, flags);
29 ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
30 if (activelow)
31 ctl &= ~(1 << led_index);
32 else
33 ctl |= (1 << led_index);
34 b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
35 spin_unlock_irqrestore(&wl->leds_lock, flags);
36 }
37
b43legacy_led_turn_off(struct b43legacy_wldev * dev,u8 led_index,bool activelow)38 static void b43legacy_led_turn_off(struct b43legacy_wldev *dev, u8 led_index,
39 bool activelow)
40 {
41 struct b43legacy_wl *wl = dev->wl;
42 unsigned long flags;
43 u16 ctl;
44
45 spin_lock_irqsave(&wl->leds_lock, flags);
46 ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
47 if (activelow)
48 ctl |= (1 << led_index);
49 else
50 ctl &= ~(1 << led_index);
51 b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
52 spin_unlock_irqrestore(&wl->leds_lock, flags);
53 }
54
55 /* Callback from the LED subsystem. */
b43legacy_led_brightness_set(struct led_classdev * led_dev,enum led_brightness brightness)56 static void b43legacy_led_brightness_set(struct led_classdev *led_dev,
57 enum led_brightness brightness)
58 {
59 struct b43legacy_led *led = container_of(led_dev, struct b43legacy_led,
60 led_dev);
61 struct b43legacy_wldev *dev = led->dev;
62 bool radio_enabled;
63
64 /* Checking the radio-enabled status here is slightly racy,
65 * but we want to avoid the locking overhead and we don't care
66 * whether the LED has the wrong state for a second. */
67 radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
68
69 if (brightness == LED_OFF || !radio_enabled)
70 b43legacy_led_turn_off(dev, led->index, led->activelow);
71 else
72 b43legacy_led_turn_on(dev, led->index, led->activelow);
73 }
74
b43legacy_register_led(struct b43legacy_wldev * dev,struct b43legacy_led * led,const char * name,const char * default_trigger,u8 led_index,bool activelow)75 static int b43legacy_register_led(struct b43legacy_wldev *dev,
76 struct b43legacy_led *led,
77 const char *name,
78 const char *default_trigger,
79 u8 led_index, bool activelow)
80 {
81 int err;
82
83 b43legacy_led_turn_off(dev, led_index, activelow);
84 if (led->dev)
85 return -EEXIST;
86 if (!default_trigger)
87 return -EINVAL;
88 led->dev = dev;
89 led->index = led_index;
90 led->activelow = activelow;
91 strlcpy(led->name, name, sizeof(led->name));
92
93 led->led_dev.name = led->name;
94 led->led_dev.default_trigger = default_trigger;
95 led->led_dev.brightness_set = b43legacy_led_brightness_set;
96
97 err = led_classdev_register(dev->dev->dev, &led->led_dev);
98 if (err) {
99 b43legacywarn(dev->wl, "LEDs: Failed to register %s\n", name);
100 led->dev = NULL;
101 return err;
102 }
103 return 0;
104 }
105
b43legacy_unregister_led(struct b43legacy_led * led)106 static void b43legacy_unregister_led(struct b43legacy_led *led)
107 {
108 if (!led->dev)
109 return;
110 led_classdev_unregister(&led->led_dev);
111 b43legacy_led_turn_off(led->dev, led->index, led->activelow);
112 led->dev = NULL;
113 }
114
b43legacy_map_led(struct b43legacy_wldev * dev,u8 led_index,enum b43legacy_led_behaviour behaviour,bool activelow)115 static void b43legacy_map_led(struct b43legacy_wldev *dev,
116 u8 led_index,
117 enum b43legacy_led_behaviour behaviour,
118 bool activelow)
119 {
120 struct ieee80211_hw *hw = dev->wl->hw;
121 char name[B43legacy_LED_MAX_NAME_LEN + 1];
122
123 /* Map the b43 specific LED behaviour value to the
124 * generic LED triggers. */
125 switch (behaviour) {
126 case B43legacy_LED_INACTIVE:
127 break;
128 case B43legacy_LED_OFF:
129 b43legacy_led_turn_off(dev, led_index, activelow);
130 break;
131 case B43legacy_LED_ON:
132 b43legacy_led_turn_on(dev, led_index, activelow);
133 break;
134 case B43legacy_LED_ACTIVITY:
135 case B43legacy_LED_TRANSFER:
136 case B43legacy_LED_APTRANSFER:
137 snprintf(name, sizeof(name),
138 "b43legacy-%s::tx", wiphy_name(hw->wiphy));
139 b43legacy_register_led(dev, &dev->led_tx, name,
140 ieee80211_get_tx_led_name(hw),
141 led_index, activelow);
142 snprintf(name, sizeof(name),
143 "b43legacy-%s::rx", wiphy_name(hw->wiphy));
144 b43legacy_register_led(dev, &dev->led_rx, name,
145 ieee80211_get_rx_led_name(hw),
146 led_index, activelow);
147 break;
148 case B43legacy_LED_RADIO_ALL:
149 case B43legacy_LED_RADIO_A:
150 case B43legacy_LED_RADIO_B:
151 case B43legacy_LED_MODE_BG:
152 snprintf(name, sizeof(name),
153 "b43legacy-%s::radio", wiphy_name(hw->wiphy));
154 b43legacy_register_led(dev, &dev->led_radio, name,
155 ieee80211_get_radio_led_name(hw),
156 led_index, activelow);
157 /* Sync the RF-kill LED state with radio and switch states. */
158 if (dev->phy.radio_on && b43legacy_is_hw_radio_enabled(dev))
159 b43legacy_led_turn_on(dev, led_index, activelow);
160 break;
161 case B43legacy_LED_WEIRD:
162 case B43legacy_LED_ASSOC:
163 snprintf(name, sizeof(name),
164 "b43legacy-%s::assoc", wiphy_name(hw->wiphy));
165 b43legacy_register_led(dev, &dev->led_assoc, name,
166 ieee80211_get_assoc_led_name(hw),
167 led_index, activelow);
168 break;
169 default:
170 b43legacywarn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
171 behaviour);
172 break;
173 }
174 }
175
b43legacy_leds_init(struct b43legacy_wldev * dev)176 void b43legacy_leds_init(struct b43legacy_wldev *dev)
177 {
178 struct ssb_bus *bus = dev->dev->bus;
179 u8 sprom[4];
180 int i;
181 enum b43legacy_led_behaviour behaviour;
182 bool activelow;
183
184 sprom[0] = bus->sprom.gpio0;
185 sprom[1] = bus->sprom.gpio1;
186 sprom[2] = bus->sprom.gpio2;
187 sprom[3] = bus->sprom.gpio3;
188
189 for (i = 0; i < 4; i++) {
190 if (sprom[i] == 0xFF) {
191 /* There is no LED information in the SPROM
192 * for this LED. Hardcode it here. */
193 activelow = false;
194 switch (i) {
195 case 0:
196 behaviour = B43legacy_LED_ACTIVITY;
197 activelow = true;
198 if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
199 behaviour = B43legacy_LED_RADIO_ALL;
200 break;
201 case 1:
202 behaviour = B43legacy_LED_RADIO_B;
203 if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
204 behaviour = B43legacy_LED_ASSOC;
205 break;
206 case 2:
207 behaviour = B43legacy_LED_RADIO_A;
208 break;
209 case 3:
210 behaviour = B43legacy_LED_OFF;
211 break;
212 default:
213 B43legacy_WARN_ON(1);
214 return;
215 }
216 } else {
217 behaviour = sprom[i] & B43legacy_LED_BEHAVIOUR;
218 activelow = !!(sprom[i] & B43legacy_LED_ACTIVELOW);
219 }
220 b43legacy_map_led(dev, i, behaviour, activelow);
221 }
222 }
223
b43legacy_leds_exit(struct b43legacy_wldev * dev)224 void b43legacy_leds_exit(struct b43legacy_wldev *dev)
225 {
226 b43legacy_unregister_led(&dev->led_tx);
227 b43legacy_unregister_led(&dev->led_rx);
228 b43legacy_unregister_led(&dev->led_assoc);
229 b43legacy_unregister_led(&dev->led_radio);
230 }
231