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