sound/pci/hda/dell_wmi_helper.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Helper functions for Dell Mic Mute LED control;
   3  * to be included from codec driver
   4  */
   5
   6 #if IS_ENABLED(CONFIG_DELL_LAPTOP)
   7 #include <linux/dell-led.h>
   8
   9 enum {
  10         MICMUTE_LED_ON,
  11         MICMUTE_LED_OFF,
  12         MICMUTE_LED_FOLLOW_CAPTURE,
  13         MICMUTE_LED_FOLLOW_MUTE,
  14 };
  15
  16 static int dell_led_mode = MICMUTE_LED_FOLLOW_MUTE;
  17 static int dell_capture;
  18 static int dell_led_value;
  19 static int (*dell_micmute_led_set_func)(int);
  20 static void (*dell_old_cap_hook)(struct hda_codec *,
  21                                  struct snd_kcontrol *,
  22                                  struct snd_ctl_elem_value *);
  23
  24 static void call_micmute_led_update(void)
  25 {
  26         int val;
  27
  28         switch (dell_led_mode) {
  29         case MICMUTE_LED_ON:
  30                 val = 1;
  31                 break;
  32         case MICMUTE_LED_OFF:
  33                 val = 0;
  34                 break;
  35         case MICMUTE_LED_FOLLOW_CAPTURE:
  36                 val = dell_capture;
  37                 break;
  38         case MICMUTE_LED_FOLLOW_MUTE:
  39         default:
  40                 val = !dell_capture;
  41                 break;
  42         }
  43
  44         if (val == dell_led_value)
  45                 return;
  46         dell_led_value = val;
  47         dell_micmute_led_set_func(dell_led_value);
  48 }
  49
  50 static void update_dell_wmi_micmute_led(struct hda_codec *codec,
  51                                         struct snd_kcontrol *kcontrol,
  52                                         struct snd_ctl_elem_value *ucontrol)
  53 {
  54         if (dell_old_cap_hook)
  55                 dell_old_cap_hook(codec, kcontrol, ucontrol);
  56
  57         if (!ucontrol || !dell_micmute_led_set_func)
  58                 return;
  59         if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
  60                 /* TODO: How do I verify if it's a mono or stereo here? */
  61                 dell_capture = (ucontrol->value.integer.value[0] ||
  62                                 ucontrol->value.integer.value[1]);
  63                 call_micmute_led_update();
  64         }
  65 }
  66
  67 static int dell_mic_mute_led_mode_info(struct snd_kcontrol *kcontrol,
  68                                        struct snd_ctl_elem_info *uinfo)
  69 {
  70         static const char * const texts[] = {
  71                 "On", "Off", "Follow Capture", "Follow Mute",
  72         };
  73
  74         return snd_ctl_enum_info(uinfo, 1, ARRAY_SIZE(texts), texts);
  75 }
  76
  77 static int dell_mic_mute_led_mode_get(struct snd_kcontrol *kcontrol,
  78                                       struct snd_ctl_elem_value *ucontrol)
  79 {
  80         ucontrol->value.enumerated.item[0] = dell_led_mode;
  81         return 0;
  82 }
  83
  84 static int dell_mic_mute_led_mode_put(struct snd_kcontrol *kcontrol,
  85                                       struct snd_ctl_elem_value *ucontrol)
  86 {
  87         unsigned int mode;
  88
  89         mode = ucontrol->value.enumerated.item[0];
  90         if (mode > MICMUTE_LED_FOLLOW_MUTE)
  91                 mode = MICMUTE_LED_FOLLOW_MUTE;
  92         if (mode == dell_led_mode)
  93                 return 0;
  94         dell_led_mode = mode;
  95         call_micmute_led_update();
  96         return 1;
  97 }
  98
  99 static const struct snd_kcontrol_new dell_mic_mute_mode_ctls[] = {
 100         {
 101                 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 102                 .name = "Mic Mute-LED Mode",
 103                 .info = dell_mic_mute_led_mode_info,
 104                 .get = dell_mic_mute_led_mode_get,
 105                 .put = dell_mic_mute_led_mode_put,
 106         },
 107         {}
 108 };
 109
 110 static void alc_fixup_dell_wmi(struct hda_codec *codec,
 111                                const struct hda_fixup *fix, int action)
 112 {
 113         struct alc_spec *spec = codec->spec;
 114         bool removefunc = false;
 115
 116         if (action == HDA_FIXUP_ACT_PROBE) {
 117                 if (!dell_micmute_led_set_func)
 118                         dell_micmute_led_set_func = symbol_request(dell_micmute_led_set);
 119                 if (!dell_micmute_led_set_func) {
 120                         codec_warn(codec, "Failed to find dell wmi symbol dell_micmute_led_set\n");
 121                         return;
 122                 }
 123
 124                 removefunc = true;
 125                 if (dell_micmute_led_set_func(false) >= 0) {
 126                         dell_led_value = 0;
 127                         if (spec->gen.num_adc_nids > 1 && !spec->gen.dyn_adc_switch)
 128                                 codec_dbg(codec, "Skipping micmute LED control due to several ADCs");
 129                         else {
 130                                 dell_old_cap_hook = spec->gen.cap_sync_hook;
 131                                 spec->gen.cap_sync_hook = update_dell_wmi_micmute_led;
 132                                 removefunc = false;
 133                                 add_mixer(spec, dell_mic_mute_mode_ctls);
 134                         }
 135                 }
 136
 137         }
 138
 139         if (dell_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
 140                 symbol_put(dell_micmute_led_set);
 141                 dell_micmute_led_set_func = NULL;
 142                 dell_old_cap_hook = NULL;
 143         }
 144 }
 145
 146 #else /* CONFIG_DELL_LAPTOP */
 147 static void alc_fixup_dell_wmi(struct hda_codec *codec,
 148                                const struct hda_fixup *fix, int action)
 149 {
 150 }
 151
 152 #endif /* CONFIG_DELL_LAPTOP */