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 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. */ 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 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 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