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
21static 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
38static 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. */
56static 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
75static 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	strscpy(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
106static 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
115static 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
176void 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
224void 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