sound/pci/hda/thinkpad_helper.c

   1 /* Helper functions for Thinkpad LED control;
   2  * to be included from codec driver
   3  */
   4
   5 #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
   6
   7 #include <linux/acpi.h>
   8 #include <linux/thinkpad_acpi.h>
   9
  10 static int (*led_set_func)(int, bool);
  11 static void (*old_vmaster_hook)(void *, int);
  12
  13 static bool is_thinkpad(struct hda_codec *codec)
  14 {
  15         return (codec->core.subsystem_id >> 16 == 0x17aa) &&
  16                (acpi_dev_found("LEN0068") || acpi_dev_found("IBM0068"));
  17 }
  18
  19 static void update_tpacpi_mute_led(void *private_data, int enabled)
  20 {
  21         if (old_vmaster_hook)
  22                 old_vmaster_hook(private_data, enabled);
  23
  24         if (led_set_func)
  25                 led_set_func(TPACPI_LED_MUTE, !enabled);
  26 }
  27
  28 static void update_tpacpi_micmute_led(struct hda_codec *codec,
  29                                       struct snd_kcontrol *kcontrol,
  30                                       struct snd_ctl_elem_value *ucontrol)
  31 {
  32         if (!ucontrol || !led_set_func)
  33                 return;
  34         if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
  35                 /* TODO: How do I verify if it's a mono or stereo here? */
  36                 bool val = ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1];
  37                 led_set_func(TPACPI_LED_MICMUTE, !val);
  38         }
  39 }
  40
  41 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  42                                     const struct hda_fixup *fix, int action)
  43 {
  44         struct hda_gen_spec *spec = codec->spec;
  45         bool removefunc = false;
  46
  47         if (action == HDA_FIXUP_ACT_PROBE) {
  48                 if (!is_thinkpad(codec))
  49                         return;
  50                 if (!led_set_func)
  51                         led_set_func = symbol_request(tpacpi_led_set);
  52                 if (!led_set_func) {
  53                         codec_warn(codec,
  54                                    "Failed to find thinkpad-acpi symbol tpacpi_led_set\n");
  55                         return;
  56                 }
  57
  58                 removefunc = true;
  59                 if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
  60                         old_vmaster_hook = spec->vmaster_mute.hook;
  61                         spec->vmaster_mute.hook = update_tpacpi_mute_led;
  62                         removefunc = false;
  63                 }
  64                 if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) {
  65                         if (spec->num_adc_nids > 1)
  66                                 codec_dbg(codec,
  67                                           "Skipping micmute LED control due to several ADCs");
  68                         else {
  69                                 spec->cap_sync_hook = update_tpacpi_micmute_led;
  70                                 removefunc = false;
  71                         }
  72                 }
  73         }
  74
  75         if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
  76                 symbol_put(tpacpi_led_set);
  77                 led_set_func = NULL;
  78                 old_vmaster_hook = NULL;
  79         }
  80 }
  81
  82 #else /* CONFIG_THINKPAD_ACPI */
  83
  84 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  85                                     const struct hda_fixup *fix, int action)
  86 {
  87 }
  88
  89 #endif /* CONFIG_THINKPAD_ACPI */