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 "b43legacy.h"
30 #include "leds.h"
31 #include "rfkill.h"
32 
33 
34 static void b43legacy_led_turn_on(struct b43legacy_wldev *dev, u8 led_index,
35 			    bool activelow)
36 {
37 	struct b43legacy_wl *wl = dev->wl;
38 	unsigned long flags;
39 	u16 ctl;
40 
41 	spin_lock_irqsave(&wl->leds_lock, flags);
42 	ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
43 	if (activelow)
44 		ctl &= ~(1 << led_index);
45 	else
46 		ctl |= (1 << led_index);
47 	b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
48 	spin_unlock_irqrestore(&wl->leds_lock, flags);
49 }
50 
51 static void b43legacy_led_turn_off(struct b43legacy_wldev *dev, u8 led_index,
52 			     bool activelow)
53 {
54 	struct b43legacy_wl *wl = dev->wl;
55 	unsigned long flags;
56 	u16 ctl;
57 
58 	spin_lock_irqsave(&wl->leds_lock, flags);
59 	ctl = b43legacy_read16(dev, B43legacy_MMIO_GPIO_CONTROL);
60 	if (activelow)
61 		ctl |= (1 << led_index);
62 	else
63 		ctl &= ~(1 << led_index);
64 	b43legacy_write16(dev, B43legacy_MMIO_GPIO_CONTROL, ctl);
65 	spin_unlock_irqrestore(&wl->leds_lock, flags);
66 }
67 
68 /* Callback from the LED subsystem. */
69 static void b43legacy_led_brightness_set(struct led_classdev *led_dev,
70 				   enum led_brightness brightness)
71 {
72 	struct b43legacy_led *led = container_of(led_dev, struct b43legacy_led,
73 				    led_dev);
74 	struct b43legacy_wldev *dev = led->dev;
75 	bool radio_enabled;
76 
77 	/* Checking the radio-enabled status here is slightly racy,
78 	 * but we want to avoid the locking overhead and we don't care
79 	 * whether the LED has the wrong state for a second. */
80 	radio_enabled = (dev->phy.radio_on && dev->radio_hw_enable);
81 
82 	if (brightness == LED_OFF || !radio_enabled)
83 		b43legacy_led_turn_off(dev, led->index, led->activelow);
84 	else
85 		b43legacy_led_turn_on(dev, led->index, led->activelow);
86 }
87 
88 static int b43legacy_register_led(struct b43legacy_wldev *dev,
89 				  struct b43legacy_led *led,
90 				  const char *name,
91 				  const char *default_trigger,
92 				  u8 led_index, bool activelow)
93 {
94 	int err;
95 
96 	b43legacy_led_turn_off(dev, led_index, activelow);
97 	if (led->dev)
98 		return -EEXIST;
99 	if (!default_trigger)
100 		return -EINVAL;
101 	led->dev = dev;
102 	led->index = led_index;
103 	led->activelow = activelow;
104 	strncpy(led->name, name, sizeof(led->name));
105 
106 	led->led_dev.name = led->name;
107 	led->led_dev.default_trigger = default_trigger;
108 	led->led_dev.brightness_set = b43legacy_led_brightness_set;
109 
110 	err = led_classdev_register(dev->dev->dev, &led->led_dev);
111 	if (err) {
112 		b43legacywarn(dev->wl, "LEDs: Failed to register %s\n", name);
113 		led->dev = NULL;
114 		return err;
115 	}
116 	return 0;
117 }
118 
119 static void b43legacy_unregister_led(struct b43legacy_led *led)
120 {
121 	if (!led->dev)
122 		return;
123 	led_classdev_unregister(&led->led_dev);
124 	b43legacy_led_turn_off(led->dev, led->index, led->activelow);
125 	led->dev = NULL;
126 }
127 
128 static void b43legacy_map_led(struct b43legacy_wldev *dev,
129 			u8 led_index,
130 			enum b43legacy_led_behaviour behaviour,
131 			bool activelow)
132 {
133 	struct ieee80211_hw *hw = dev->wl->hw;
134 	char name[B43legacy_LED_MAX_NAME_LEN + 1];
135 
136 	/* Map the b43 specific LED behaviour value to the
137 	 * generic LED triggers. */
138 	switch (behaviour) {
139 	case B43legacy_LED_INACTIVE:
140 		break;
141 	case B43legacy_LED_OFF:
142 		b43legacy_led_turn_off(dev, led_index, activelow);
143 		break;
144 	case B43legacy_LED_ON:
145 		b43legacy_led_turn_on(dev, led_index, activelow);
146 		break;
147 	case B43legacy_LED_ACTIVITY:
148 	case B43legacy_LED_TRANSFER:
149 	case B43legacy_LED_APTRANSFER:
150 		snprintf(name, sizeof(name),
151 			 "b43legacy-%s::tx", wiphy_name(hw->wiphy));
152 		b43legacy_register_led(dev, &dev->led_tx, name,
153 				 ieee80211_get_tx_led_name(hw),
154 				 led_index, activelow);
155 		snprintf(name, sizeof(name),
156 			 "b43legacy-%s::rx", wiphy_name(hw->wiphy));
157 		b43legacy_register_led(dev, &dev->led_rx, name,
158 				 ieee80211_get_rx_led_name(hw),
159 				 led_index, activelow);
160 		break;
161 	case B43legacy_LED_RADIO_ALL:
162 	case B43legacy_LED_RADIO_A:
163 	case B43legacy_LED_RADIO_B:
164 	case B43legacy_LED_MODE_BG:
165 		snprintf(name, sizeof(name),
166 			 "b43legacy-%s::radio", wiphy_name(hw->wiphy));
167 		b43legacy_register_led(dev, &dev->led_radio, name,
168 				 ieee80211_get_radio_led_name(hw),
169 				 led_index, activelow);
170 		/* Sync the RF-kill LED state with radio and switch states. */
171 		if (dev->phy.radio_on && b43legacy_is_hw_radio_enabled(dev))
172 			b43legacy_led_turn_on(dev, led_index, activelow);
173 		break;
174 	case B43legacy_LED_WEIRD:
175 	case B43legacy_LED_ASSOC:
176 		snprintf(name, sizeof(name),
177 			 "b43legacy-%s::assoc", wiphy_name(hw->wiphy));
178 		b43legacy_register_led(dev, &dev->led_assoc, name,
179 				 ieee80211_get_assoc_led_name(hw),
180 				 led_index, activelow);
181 		break;
182 	default:
183 		b43legacywarn(dev->wl, "LEDs: Unknown behaviour 0x%02X\n",
184 			behaviour);
185 		break;
186 	}
187 }
188 
189 void b43legacy_leds_init(struct b43legacy_wldev *dev)
190 {
191 	struct ssb_bus *bus = dev->dev->bus;
192 	u8 sprom[4];
193 	int i;
194 	enum b43legacy_led_behaviour behaviour;
195 	bool activelow;
196 
197 	sprom[0] = bus->sprom.gpio0;
198 	sprom[1] = bus->sprom.gpio1;
199 	sprom[2] = bus->sprom.gpio2;
200 	sprom[3] = bus->sprom.gpio3;
201 
202 	for (i = 0; i < 4; i++) {
203 		if (sprom[i] == 0xFF) {
204 			/* There is no LED information in the SPROM
205 			 * for this LED. Hardcode it here. */
206 			activelow = false;
207 			switch (i) {
208 			case 0:
209 				behaviour = B43legacy_LED_ACTIVITY;
210 				activelow = true;
211 				if (bus->boardinfo.vendor == PCI_VENDOR_ID_COMPAQ)
212 					behaviour = B43legacy_LED_RADIO_ALL;
213 				break;
214 			case 1:
215 				behaviour = B43legacy_LED_RADIO_B;
216 				if (bus->boardinfo.vendor == PCI_VENDOR_ID_ASUSTEK)
217 					behaviour = B43legacy_LED_ASSOC;
218 				break;
219 			case 2:
220 				behaviour = B43legacy_LED_RADIO_A;
221 				break;
222 			case 3:
223 				behaviour = B43legacy_LED_OFF;
224 				break;
225 			default:
226 				B43legacy_WARN_ON(1);
227 				return;
228 			}
229 		} else {
230 			behaviour = sprom[i] & B43legacy_LED_BEHAVIOUR;
231 			activelow = !!(sprom[i] & B43legacy_LED_ACTIVELOW);
232 		}
233 		b43legacy_map_led(dev, i, behaviour, activelow);
234 	}
235 }
236 
237 void b43legacy_leds_exit(struct b43legacy_wldev *dev)
238 {
239 	b43legacy_unregister_led(&dev->led_tx);
240 	b43legacy_unregister_led(&dev->led_rx);
241 	b43legacy_unregister_led(&dev->led_assoc);
242 	b43legacy_unregister_led(&dev->led_radio);
243 }
244