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_DELL_LAPTOP)
   6 #include <linux/dell-led.h>
   7
   8 enum {
   9         MICMUTE_LED_ON,
  10         MICMUTE_LED_OFF,
  11         MICMUTE_LED_FOLLOW_CAPTURE,
  12         MICMUTE_LED_FOLLOW_MUTE,
  13 };
  14
  15 static int dell_led_mode = MICMUTE_LED_FOLLOW_MUTE;
  16 static int dell_capture;
  17 static int dell_led_value;
  18 static int (*dell_micmute_led_set_func)(int);
  19 static void (*dell_old_cap_hook)(struct hda_codec *,
  20                                  struct snd_kcontrol *,
  21                                  struct snd_ctl_elem_value *);
  22
  23 static void call_micmute_led_update(void)
  24 {
  25         int val;
  26
  27         switch (dell_led_mode) {
  28         case MICMUTE_LED_ON:
  29                 val = 1;
  30                 break;
  31         case MICMUTE_LED_OFF:
  32                 val = 0;
  33                 break;
  34         case MICMUTE_LED_FOLLOW_CAPTURE:
  35                 val = dell_capture;
  36                 break;
  37         case MICMUTE_LED_FOLLOW_MUTE:
  38         default:
  39                 val = !dell_capture;
  40                 break;
  41         }
  42
  43         if (val == dell_led_value)
  44                 return;
  45         dell_led_value = val;
  46         dell_micmute_led_set_func(dell_led_value);
  47 }
  48
  49 static void update_dell_wmi_micmute_led(struct hda_codec *codec,
  50                                         struct snd_kcontrol *kcontrol,
  51                                         struct snd_ctl_elem_value *ucontrol)
  52 {
  53         if (dell_old_cap_hook)
  54                 dell_old_cap_hook(codec, kcontrol, ucontrol);
  55
  56         if (!ucontrol || !dell_micmute_led_set_func)
  57                 return;
  58         if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
  59                 /* TODO: How do I verify if it's a mono or stereo here? */
  60                 dell_capture = (ucontrol->value.integer.value[0] ||
  61                                 ucontrol->value.integer.value[1]);
  62                 call_micmute_led_update();
  63         }
  64 }
  65
  66 static int dell_mic_mute_led_mode_info(struct snd_kcontrol *kcontrol,
  67                                        struct snd_ctl_elem_info *uinfo)
  68 {
  69         static const char * const texts[] = {
  70                 "On", "Off", "Follow Capture", "Follow Mute",
  71         };
  72
  73         return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
  74 }
  75
  76 static int dell_mic_mute_led_mode_get(struct snd_kcontrol *kcontrol,
  77                                       struct snd_ctl_elem_value *ucontrol)
  78 {
  79         ucontrol->value.enumerated.item[0] = dell_led_mode;
  80         return 0;
  81 }
  82
  83 static int dell_mic_mute_led_mode_put(struct snd_kcontrol *kcontrol,
  84                                       struct snd_ctl_elem_value *ucontrol)
  85 {
  86         unsigned int mode;
  87
  88         mode = ucontrol->value.enumerated.item[0];
  89         if (mode > MICMUTE_LED_FOLLOW_MUTE)
  90                 mode = MICMUTE_LED_FOLLOW_MUTE;
  91         if (mode == dell_led_mode)
  92                 return 0;
  93         dell_led_mode = mode;
  94         call_micmute_led_update();
  95         return 1;
  96 }
  97
  98 static const struct snd_kcontrol_new dell_mic_mute_mode_ctls[] = {
  99         {
 100                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 101                 .name = "Mic Mute-LED Mode",
 102                 .info = dell_mic_mute_led_mode_info,
 103                 .get = dell_mic_mute_led_mode_get,
 104                 .put = dell_mic_mute_led_mode_put,
 105         },
 106         {}
 107 };
 108
 109 static void alc_fixup_dell_wmi(struct hda_codec *codec,
 110                                const struct hda_fixup *fix, int action)
 111 {
 112         struct alc_spec *spec = codec->spec;
 113         bool removefunc = false;
 114
 115         if (action == HDA_FIXUP_ACT_PROBE) {
 116                 if (!dell_micmute_led_set_func)
 117                         dell_micmute_led_set_func = symbol_request(dell_micmute_led_set);
 118                 if (!dell_micmute_led_set_func) {
 119                         codec_warn(codec, "Failed to find dell wmi symbol dell_micmute_led_set\n");
 120                         return;
 121                 }
 122
 123                 removefunc = true;
 124                 if (dell_micmute_led_set_func(false) >= 0) {
 125                         dell_led_value = 0;
 126                         if (spec->gen.num_adc_nids > 1 && !spec->gen.dyn_adc_switch)
 127                                 codec_dbg(codec, "Skipping micmute LED control due to several ADCs");
 128                         else {
 129                                 dell_old_cap_hook = spec->gen.cap_sync_hook;
 130                                 spec->gen.cap_sync_hook = update_dell_wmi_micmute_led;
 131                                 removefunc = false;
 132                                 add_mixer(spec, dell_mic_mute_mode_ctls);
 133                         }
 134                 }
 135
 136         }
 137
 138         if (dell_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
 139                 symbol_put(dell_micmute_led_set);
 140                 dell_micmute_led_set_func = NULL;
 141                 dell_old_cap_hook = NULL;
 142         }
 143 }
 144
 145 #else /* CONFIG_DELL_LAPTOP */
 146 static void alc_fixup_dell_wmi(struct hda_codec *codec,
 147                                const struct hda_fixup *fix, int action)
 148 {
 149 }
 150
 151 #endif /* CONFIG_DELL_LAPTOP */