drivers/net/wireless/broadcom/brcm80211/brcmsmac/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
  22 static 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. */
  35 static 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
  43 void 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
  51 int 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         if (!bcma_gpio || !gpio_is_valid(bcma_gpio->base))
  67                 return -ENODEV;
  68
  69         /* find radio enabled LED */
  70         for (i = 0; i < BRCMS_LED_NO; i++) {
  71                 u8 led = *leds[i];
  72                 if ((led & BRCMS_LED_BEH_MASK) == BRCMS_LED_RADIO) {
  73                         hwnum = i;
  74                         if (led & BRCMS_LED_AL_MASK)
  75                                 lflags = GPIO_ACTIVE_LOW;
  76                         break;
  77                 }
  78         }
  79
  80         /* No LED, bail out */
  81         if (hwnum == -1)
  82                 return -ENODEV;
  83
  84         /* Try to obtain this LED GPIO line */
  85         radio_led->gpiod = gpiochip_request_own_desc(bcma_gpio, hwnum,
  86                                                      "radio on", lflags,
  87                                                      GPIOD_OUT_LOW);
  88
  89         if (IS_ERR(radio_led->gpiod)) {
  90                 err = PTR_ERR(radio_led->gpiod);
  91                 wiphy_err(wl->wiphy, "requesting led GPIO failed (err: %d)\n",
  92                           err);
  93                 return err;
  94         }
  95
  96         snprintf(wl->radio_led.name, sizeof(wl->radio_led.name),
  97                  "brcmsmac-%s:radio", wiphy_name(wl->wiphy));
  98
  99         wl->led_dev.name = wl->radio_led.name;
 100         wl->led_dev.default_trigger =
 101                 ieee80211_get_radio_led_name(wl->pub->ieee_hw);
 102         wl->led_dev.brightness_set = brcms_led_brightness_set;
 103         err = led_classdev_register(wiphy_dev(wl->wiphy), &wl->led_dev);
 104
 105         if (err) {
 106                 wiphy_err(wl->wiphy, "cannot register led device: %s (err: %d)\n",
 107                           wl->radio_led.name, err);
 108                 return err;
 109         }
 110
 111         wiphy_info(wl->wiphy, "registered radio enabled led device: %s\n",
 112                    wl->radio_led.name);
 113
 114         return 0;
 115 }