1// SPDX-License-Identifier: GPL-2.0
2#include <net/mac80211.h>
3#include <linux/bcma/bcma_driver_chipcommon.h>
4#include <linux/gpio.h>
5#include <linux/gpio/driver.h>
6#include <linux/gpio/machine.h>
7#include <linux/gpio/consumer.h>
8
9#include "mac80211_if.h"
10#include "pub.h"
11#include "main.h"
12#include "led.h"
13
14	/* number of leds */
15#define  BRCMS_LED_NO		4
16	/* behavior mask */
17#define  BRCMS_LED_BEH_MASK	0x7f
18	/* activelow (polarity) bit */
19#define  BRCMS_LED_AL_MASK	0x80
20	/* radio enabled */
21#define  BRCMS_LED_RADIO	3
22
23static void brcms_radio_led_ctrl(struct brcms_info *wl, bool state)
24{
25	if (!wl->radio_led.gpiod)
26		return;
27
28	if (state)
29		gpiod_set_value(wl->radio_led.gpiod, 1);
30	else
31		gpiod_set_value(wl->radio_led.gpiod, 0);
32}
33
34
35/* Callback from the LED subsystem. */
36static void brcms_led_brightness_set(struct led_classdev *led_dev,
37				   enum led_brightness brightness)
38{
39	struct brcms_info *wl = container_of(led_dev,
40		struct brcms_info, led_dev);
41	brcms_radio_led_ctrl(wl, brightness);
42}
43
44void brcms_led_unregister(struct brcms_info *wl)
45{
46	if (wl->led_dev.dev)
47		led_classdev_unregister(&wl->led_dev);
48	if (wl->radio_led.gpiod)
49		gpiochip_free_own_desc(wl->radio_led.gpiod);
50}
51
52int brcms_led_register(struct brcms_info *wl)
53{
54	int i, err;
55	struct brcms_led *radio_led = &wl->radio_led;
56	/* get CC core */
57	struct bcma_drv_cc *cc_drv  = &wl->wlc->hw->d11core->bus->drv_cc;
58	struct gpio_chip *bcma_gpio = &cc_drv->gpio;
59	struct ssb_sprom *sprom = &wl->wlc->hw->d11core->bus->sprom;
60	u8 *leds[] = { &sprom->gpio0,
61		&sprom->gpio1,
62		&sprom->gpio2,
63		&sprom->gpio3 };
64	int hwnum = -1;
65	enum gpio_lookup_flags lflags = GPIO_ACTIVE_HIGH;
66
67	/* find radio enabled LED */
68	for (i = 0; i < BRCMS_LED_NO; i++) {
69		u8 led = *leds[i];
70		if ((led & BRCMS_LED_BEH_MASK) == BRCMS_LED_RADIO) {
71			hwnum = i;
72			if (led & BRCMS_LED_AL_MASK)
73				lflags = GPIO_ACTIVE_LOW;
74			break;
75		}
76	}
77
78	/* No LED, bail out */
79	if (hwnum == -1)
80		return -ENODEV;
81
82	/* Try to obtain this LED GPIO line */
83	radio_led->gpiod = gpiochip_request_own_desc(bcma_gpio, hwnum,
84						     "radio on", lflags,
85						     GPIOD_OUT_LOW);
86
87	if (IS_ERR(radio_led->gpiod)) {
88		err = PTR_ERR(radio_led->gpiod);
89		wiphy_err(wl->wiphy, "requesting led GPIO failed (err: %d)\n",
90			  err);
91		return err;
92	}
93
94	snprintf(wl->radio_led.name, sizeof(wl->radio_led.name),
95		 "brcmsmac-%s:radio", wiphy_name(wl->wiphy));
96
97	wl->led_dev.name = wl->radio_led.name;
98	wl->led_dev.default_trigger =
99		ieee80211_get_radio_led_name(wl->pub->ieee_hw);
100	wl->led_dev.brightness_set = brcms_led_brightness_set;
101	err = led_classdev_register(wiphy_dev(wl->wiphy), &wl->led_dev);
102
103	if (err) {
104		wiphy_err(wl->wiphy, "cannot register led device: %s (err: %d)\n",
105			  wl->radio_led.name, err);
106		return err;
107	}
108
109	wiphy_info(wl->wiphy, "registered radio enabled led device: %s\n",
110		   wl->radio_led.name);
111
112	return 0;
113}
114