1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
4	<http://rt2x00.serialmonkey.com>
5
6 */
7
8/*
9	Module: rt2x00lib
10	Abstract: rt2x00 led specific routines.
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15
16#include "rt2x00.h"
17#include "rt2x00lib.h"
18
19void rt2x00leds_led_quality(struct rt2x00_dev *rt2x00dev, int rssi)
20{
21	struct rt2x00_led *led = &rt2x00dev->led_qual;
22	unsigned int brightness;
23
24	if ((led->type != LED_TYPE_QUALITY) || !(led->flags & LED_REGISTERED))
25		return;
26
27	/*
28	 * Led handling requires a positive value for the rssi,
29	 * to do that correctly we need to add the correction.
30	 */
31	rssi += rt2x00dev->rssi_offset;
32
33	/*
34	 * Get the rssi level, this is used to convert the rssi
35	 * to a LED value inside the range LED_OFF - LED_FULL.
36	 */
37	if (rssi <= 30)
38		rssi = 0;
39	else if (rssi <= 39)
40		rssi = 1;
41	else if (rssi <= 49)
42		rssi = 2;
43	else if (rssi <= 53)
44		rssi = 3;
45	else if (rssi <= 63)
46		rssi = 4;
47	else
48		rssi = 5;
49
50	/*
51	 * Note that we must _not_ send LED_OFF since the driver
52	 * is going to calculate the value and might use it in a
53	 * division.
54	 */
55	brightness = ((LED_FULL / 6) * rssi) + 1;
56	if (brightness != led->led_dev.brightness) {
57		led->led_dev.brightness_set(&led->led_dev, brightness);
58		led->led_dev.brightness = brightness;
59	}
60}
61
62static void rt2x00led_led_simple(struct rt2x00_led *led, bool enabled)
63{
64	unsigned int brightness = enabled ? LED_FULL : LED_OFF;
65
66	if (!(led->flags & LED_REGISTERED))
67		return;
68
69	led->led_dev.brightness_set(&led->led_dev, brightness);
70	led->led_dev.brightness = brightness;
71}
72
73void rt2x00led_led_activity(struct rt2x00_dev *rt2x00dev, bool enabled)
74{
75	if (rt2x00dev->led_qual.type == LED_TYPE_ACTIVITY)
76		rt2x00led_led_simple(&rt2x00dev->led_qual, enabled);
77}
78
79void rt2x00leds_led_assoc(struct rt2x00_dev *rt2x00dev, bool enabled)
80{
81	if (rt2x00dev->led_assoc.type == LED_TYPE_ASSOC)
82		rt2x00led_led_simple(&rt2x00dev->led_assoc, enabled);
83}
84
85void rt2x00leds_led_radio(struct rt2x00_dev *rt2x00dev, bool enabled)
86{
87	if (rt2x00dev->led_radio.type == LED_TYPE_RADIO)
88		rt2x00led_led_simple(&rt2x00dev->led_radio, enabled);
89}
90
91static int rt2x00leds_register_led(struct rt2x00_dev *rt2x00dev,
92				   struct rt2x00_led *led,
93				   const char *name)
94{
95	struct device *device = wiphy_dev(rt2x00dev->hw->wiphy);
96	int retval;
97
98	led->led_dev.name = name;
99	led->led_dev.brightness = LED_OFF;
100
101	retval = led_classdev_register(device, &led->led_dev);
102	if (retval) {
103		rt2x00_err(rt2x00dev, "Failed to register led handler\n");
104		return retval;
105	}
106
107	led->flags |= LED_REGISTERED;
108
109	return 0;
110}
111
112void rt2x00leds_register(struct rt2x00_dev *rt2x00dev)
113{
114	char name[36];
115	int retval;
116	unsigned long on_period;
117	unsigned long off_period;
118	const char *phy_name = wiphy_name(rt2x00dev->hw->wiphy);
119
120	if (rt2x00dev->led_radio.flags & LED_INITIALIZED) {
121		snprintf(name, sizeof(name), "%s-%s::radio",
122			 rt2x00dev->ops->name, phy_name);
123
124		retval = rt2x00leds_register_led(rt2x00dev,
125						 &rt2x00dev->led_radio,
126						 name);
127		if (retval)
128			goto exit_fail;
129	}
130
131	if (rt2x00dev->led_assoc.flags & LED_INITIALIZED) {
132		snprintf(name, sizeof(name), "%s-%s::assoc",
133			 rt2x00dev->ops->name, phy_name);
134
135		retval = rt2x00leds_register_led(rt2x00dev,
136						 &rt2x00dev->led_assoc,
137						 name);
138		if (retval)
139			goto exit_fail;
140	}
141
142	if (rt2x00dev->led_qual.flags & LED_INITIALIZED) {
143		snprintf(name, sizeof(name), "%s-%s::quality",
144			 rt2x00dev->ops->name, phy_name);
145
146		retval = rt2x00leds_register_led(rt2x00dev,
147						 &rt2x00dev->led_qual,
148						 name);
149		if (retval)
150			goto exit_fail;
151	}
152
153	/*
154	 * Initialize blink time to default value:
155	 * On period: 70ms
156	 * Off period: 30ms
157	 */
158	if (rt2x00dev->led_radio.led_dev.blink_set) {
159		on_period = 70;
160		off_period = 30;
161		rt2x00dev->led_radio.led_dev.blink_set(
162		    &rt2x00dev->led_radio.led_dev, &on_period, &off_period);
163	}
164
165	return;
166
167exit_fail:
168	rt2x00leds_unregister(rt2x00dev);
169}
170
171static void rt2x00leds_unregister_led(struct rt2x00_led *led)
172{
173	led_classdev_unregister(&led->led_dev);
174
175	/*
176	 * This might look weird, but when we are unregistering while
177	 * suspended the led is already off, and since we haven't
178	 * fully resumed yet, access to the device might not be
179	 * possible yet.
180	 */
181	if (!(led->led_dev.flags & LED_SUSPENDED))
182		led->led_dev.brightness_set(&led->led_dev, LED_OFF);
183
184	led->flags &= ~LED_REGISTERED;
185}
186
187void rt2x00leds_unregister(struct rt2x00_dev *rt2x00dev)
188{
189	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
190		rt2x00leds_unregister_led(&rt2x00dev->led_qual);
191	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
192		rt2x00leds_unregister_led(&rt2x00dev->led_assoc);
193	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
194		rt2x00leds_unregister_led(&rt2x00dev->led_radio);
195}
196
197static inline void rt2x00leds_suspend_led(struct rt2x00_led *led)
198{
199	led_classdev_suspend(&led->led_dev);
200
201	/* This shouldn't be needed, but just to be safe */
202	led->led_dev.brightness_set(&led->led_dev, LED_OFF);
203	led->led_dev.brightness = LED_OFF;
204}
205
206void rt2x00leds_suspend(struct rt2x00_dev *rt2x00dev)
207{
208	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
209		rt2x00leds_suspend_led(&rt2x00dev->led_qual);
210	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
211		rt2x00leds_suspend_led(&rt2x00dev->led_assoc);
212	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
213		rt2x00leds_suspend_led(&rt2x00dev->led_radio);
214}
215
216static inline void rt2x00leds_resume_led(struct rt2x00_led *led)
217{
218	led_classdev_resume(&led->led_dev);
219
220	/* Device might have enabled the LEDS during resume */
221	led->led_dev.brightness_set(&led->led_dev, LED_OFF);
222	led->led_dev.brightness = LED_OFF;
223}
224
225void rt2x00leds_resume(struct rt2x00_dev *rt2x00dev)
226{
227	if (rt2x00dev->led_radio.flags & LED_REGISTERED)
228		rt2x00leds_resume_led(&rt2x00dev->led_radio);
229	if (rt2x00dev->led_assoc.flags & LED_REGISTERED)
230		rt2x00leds_resume_led(&rt2x00dev->led_assoc);
231	if (rt2x00dev->led_qual.flags & LED_REGISTERED)
232		rt2x00leds_resume_led(&rt2x00dev->led_qual);
233}
234