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
brcms_radio_led_ctrl(struct brcms_info * wl,bool state)23 static 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. */
brcms_led_brightness_set(struct led_classdev * led_dev,enum led_brightness brightness)36 static 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
brcms_led_unregister(struct brcms_info * wl)44 void 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
brcms_led_register(struct brcms_info * wl)52 int 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