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
34static 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
51static 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. */
69static 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
88static 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
119static 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
128static 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
189void 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
237void 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