drivers/net/wireless/brcm80211/brcmsmac/led.c

   1 #include <net/mac80211.h>
   2 #include <linux/bcma/bcma_driver_chipcommon.h>
   3 #include <linux/gpio.h>
   4
   5 #include "mac80211_if.h"
   6 #include "pub.h"
   7 #include "main.h"
   8 #include "led.h"
   9
  10         /* number of leds */
  11 #define  BRCMS_LED_NO           4
  12         /* behavior mask */
  13 #define  BRCMS_LED_BEH_MASK     0x7f
  14         /* activelow (polarity) bit */
  15 #define  BRCMS_LED_AL_MASK      0x80
  16         /* radio enabled */
  17 #define  BRCMS_LED_RADIO        3
  18
  19 static void brcms_radio_led_ctrl(struct brcms_info *wl, bool state)
  20 {
  21         if (wl->radio_led.gpio == -1)
  22                 return;
  23
  24         if (wl->radio_led.active_low)
  25                 state = !state;
  26
  27         if (state)
  28                 gpio_set_value(wl->radio_led.gpio, 1);
  29         else
  30                 gpio_set_value(wl->radio_led.gpio, 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.gpio != -1)
  48                 gpio_free(wl->radio_led.gpio);
  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         unsigned gpio = -1;
  64         bool active_low = false;
  65
  66         /* none by default */
  67         radio_led->gpio = -1;
  68         radio_led->active_low = false;
  69
  70         if (!bcma_gpio || !gpio_is_valid(bcma_gpio->base))
  71                 return -ENODEV;
  72
  73         /* find radio enabled LED */
  74         for (i = 0; i < BRCMS_LED_NO; i++) {
  75                 u8 led = *leds[i];
  76                 if ((led & BRCMS_LED_BEH_MASK) == BRCMS_LED_RADIO) {
  77                         gpio = bcma_gpio->base + i;
  78                         if (led & BRCMS_LED_AL_MASK)
  79                                 active_low = true;
  80                         break;
  81                 }
  82         }
  83
  84         if (gpio == -1 || !gpio_is_valid(gpio))
  85                 return -ENODEV;
  86
  87         /* request and configure LED gpio */
  88         err = gpio_request_one(gpio,
  89                                 active_low ? GPIOF_OUT_INIT_HIGH
  90                                         : GPIOF_OUT_INIT_LOW,
  91                                 "radio on");
  92         if (err) {
  93                 wiphy_err(wl->wiphy, "requesting led gpio %d failed (err: %d)\n",
  94                           gpio, err);
  95                 return err;
  96         }
  97         err = gpio_direction_output(gpio, 1);
  98         if (err) {
  99                 wiphy_err(wl->wiphy, "cannot set led gpio %d to output (err: %d)\n",
 100                           gpio, err);
 101                 return err;
 102         }
 103
 104         snprintf(wl->radio_led.name, sizeof(wl->radio_led.name),
 105                  "brcmsmac-%s:radio", wiphy_name(wl->wiphy));
 106
 107         wl->led_dev.name = wl->radio_led.name;
 108         wl->led_dev.default_trigger =
 109                 ieee80211_get_radio_led_name(wl->pub->ieee_hw);
 110         wl->led_dev.brightness_set = brcms_led_brightness_set;
 111         err = led_classdev_register(wiphy_dev(wl->wiphy), &wl->led_dev);
 112
 113         if (err) {
 114                 wiphy_err(wl->wiphy, "cannot register led device: %s (err: %d)\n",
 115                           wl->radio_led.name, err);
 116                 return err;
 117         }
 118
 119         wiphy_info(wl->wiphy, "registered radio enabled led device: %s gpio: %d\n",
 120                    wl->radio_led.name,
 121                    gpio);
 122         radio_led->gpio = gpio;
 123         radio_led->active_low = active_low;
 124
 125         return 0;
 126 }