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("LEN0268") ||
  17                 acpi_dev_found("IBM0068"));
  18 }
  19
  20 static void update_tpacpi_mute_led(void *private_data, int enabled)
  21 {
  22         if (old_vmaster_hook)
  23                 old_vmaster_hook(private_data, enabled);
  24
  25         if (led_set_func)
  26                 led_set_func(TPACPI_LED_MUTE, !enabled);
  27 }
  28
  29 static void update_tpacpi_micmute_led(struct hda_codec *codec,
  30                                       struct snd_kcontrol *kcontrol,
  31                                       struct snd_ctl_elem_value *ucontrol)
  32 {
  33         if (!ucontrol || !led_set_func)
  34                 return;
  35         if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
  36                 /* TODO: How do I verify if it's a mono or stereo here? */
  37                 bool val = ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1];
  38                 led_set_func(TPACPI_LED_MICMUTE, !val);
  39         }
  40 }
  41
  42 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  43                                     const struct hda_fixup *fix, int action)
  44 {
  45         struct hda_gen_spec *spec = codec->spec;
  46         bool removefunc = false;
  47
  48         if (action == HDA_FIXUP_ACT_PROBE) {
  49                 if (!is_thinkpad(codec))
  50                         return;
  51                 if (!led_set_func)
  52                         led_set_func = symbol_request(tpacpi_led_set);
  53                 if (!led_set_func) {
  54                         codec_warn(codec,
  55                                    "Failed to find thinkpad-acpi symbol tpacpi_led_set\n");
  56                         return;
  57                 }
  58
  59                 removefunc = true;
  60                 if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
  61                         old_vmaster_hook = spec->vmaster_mute.hook;
  62                         spec->vmaster_mute.hook = update_tpacpi_mute_led;
  63                         removefunc = false;
  64                 }
  65                 if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) {
  66                         if (spec->num_adc_nids > 1 && !spec->dyn_adc_switch)
  67                                 codec_dbg(codec,
  68                                           "Skipping micmute LED control due to several ADCs");
  69                         else {
  70                                 spec->cap_sync_hook = update_tpacpi_micmute_led;
  71                                 removefunc = false;
  72                         }
  73                 }
  74         }
  75
  76         if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
  77                 symbol_put(tpacpi_led_set);
  78                 led_set_func = NULL;
  79                 old_vmaster_hook = NULL;
  80         }
  81 }
  82
  83 #else /* CONFIG_THINKPAD_ACPI */
  84
  85 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  86                                     const struct hda_fixup *fix, int action)
  87 {
  88 }
  89
  90 #endif /* CONFIG_THINKPAD_ACPI */