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 
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 
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. */
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 
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 
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 
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 
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 
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