kernel/sound/pci/hda/dell_wmi_helper.c

   1 /* Helper functions for Dell Mic Mute LED control;
   2  * to be included from codec driver
   3  */
   4
   5 #if IS_ENABLED(CONFIG_LEDS_DELL_NETBOOKS)
   6 #include <linux/dell-led.h>
   7
   8 static int dell_led_value;
   9 static int (*dell_led_set_func)(int, int);
  10 static void (*dell_old_cap_hook)(struct hda_codec *,
  11                                  struct snd_kcontrol *,
  12                                  struct snd_ctl_elem_value *);
  13
  14 static void update_dell_wmi_micmute_led(struct hda_codec *codec,
  15                                         struct snd_kcontrol *kcontrol,
  16                                         struct snd_ctl_elem_value *ucontrol)
  17 {
  18         if (dell_old_cap_hook)
  19                 dell_old_cap_hook(codec, kcontrol, ucontrol);
  20
  21         if (!ucontrol || !dell_led_set_func)
  22                 return;
  23         if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
  24                 /* TODO: How do I verify if it's a mono or stereo here? */
  25                 int val = (ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1]) ? 0 : 1;
  26                 if (val == dell_led_value)
  27                         return;
  28                 dell_led_value = val;
  29                 if (dell_led_set_func)
  30                         dell_led_set_func(DELL_LED_MICMUTE, dell_led_value);
  31         }
  32 }
  33
  34
  35 static void alc_fixup_dell_wmi(struct hda_codec *codec,
  36                                const struct hda_fixup *fix, int action)
  37 {
  38         struct alc_spec *spec = codec->spec;
  39         bool removefunc = false;
  40
  41         if (action == HDA_FIXUP_ACT_PROBE) {
  42                 if (!dell_led_set_func)
  43                         dell_led_set_func = symbol_request(dell_app_wmi_led_set);
  44                 if (!dell_led_set_func) {
  45                         codec_warn(codec, "Failed to find dell wmi symbol dell_app_wmi_led_set\n");
  46                         return;
  47                 }
  48
  49                 removefunc = true;
  50                 if (dell_led_set_func(DELL_LED_MICMUTE, false) >= 0) {
  51                         dell_led_value = 0;
  52                         if (spec->gen.num_adc_nids > 1)
  53                                 codec_dbg(codec, "Skipping micmute LED control due to several ADCs");
  54                         else {
  55                                 dell_old_cap_hook = spec->gen.cap_sync_hook;
  56                                 spec->gen.cap_sync_hook = update_dell_wmi_micmute_led;
  57                                 removefunc = false;
  58                         }
  59                 }
  60
  61         }
  62
  63         if (dell_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
  64                 symbol_put(dell_app_wmi_led_set);
  65                 dell_led_set_func = NULL;
  66                 dell_old_cap_hook = NULL;
  67         }
  68 }
  69
  70 #else /* CONFIG_LEDS_DELL_NETBOOKS */
  71 static void alc_fixup_dell_wmi(struct hda_codec *codec,
  72                                const struct hda_fixup *fix, int action)
  73 {
  74 }
  75
  76 #endif /* CONFIG_LEDS_DELL_NETBOOKS */