led.c

  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}