sound/pci/hda/thinkpad_helper.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Helper functions for Thinkpad LED control;
   3  * to be included from codec driver
   4  */
   5
   6 #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
   7
   8 #include <linux/acpi.h>
   9 #include <linux/thinkpad_acpi.h>
  10
  11 static int (*led_set_func)(int, bool);
  12 static void (*old_vmaster_hook)(void *, int);
  13
  14 static bool is_thinkpad(struct hda_codec *codec)
  15 {
  16         return (codec->core.subsystem_id >> 16 == 0x17aa) &&
  17                (acpi_dev_found("LEN0068") || acpi_dev_found("LEN0268") ||
  18                 acpi_dev_found("IBM0068"));
  19 }
  20
  21 static void update_tpacpi_mute_led(void *private_data, int enabled)
  22 {
  23         if (old_vmaster_hook)
  24                 old_vmaster_hook(private_data, enabled);
  25
  26         if (led_set_func)
  27                 led_set_func(TPACPI_LED_MUTE, !enabled);
  28 }
  29
  30 static void update_tpacpi_micmute_led(struct hda_codec *codec,
  31                                       struct snd_kcontrol *kcontrol,
  32                                       struct snd_ctl_elem_value *ucontrol)
  33 {
  34         if (!ucontrol || !led_set_func)
  35                 return;
  36         if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
  37                 /* TODO: How do I verify if it's a mono or stereo here? */
  38                 bool val = ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1];
  39                 led_set_func(TPACPI_LED_MICMUTE, !val);
  40         }
  41 }
  42
  43 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  44                                     const struct hda_fixup *fix, int action)
  45 {
  46         struct hda_gen_spec *spec = codec->spec;
  47         bool removefunc = false;
  48
  49         if (action == HDA_FIXUP_ACT_PROBE) {
  50                 if (!is_thinkpad(codec))
  51                         return;
  52                 if (!led_set_func)
  53                         led_set_func = symbol_request(tpacpi_led_set);
  54                 if (!led_set_func) {
  55                         codec_warn(codec,
  56                                    "Failed to find thinkpad-acpi symbol tpacpi_led_set\n");
  57                         return;
  58                 }
  59
  60                 removefunc = true;
  61                 if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
  62                         old_vmaster_hook = spec->vmaster_mute.hook;
  63                         spec->vmaster_mute.hook = update_tpacpi_mute_led;
  64                         removefunc = false;
  65                 }
  66                 if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) {
  67                         if (spec->num_adc_nids > 1 && !spec->dyn_adc_switch)
  68                                 codec_dbg(codec,
  69                                           "Skipping micmute LED control due to several ADCs");
  70                         else {
  71                                 spec->cap_sync_hook = update_tpacpi_micmute_led;
  72                                 removefunc = false;
  73                         }
  74                 }
  75         }
  76
  77         if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
  78                 symbol_put(tpacpi_led_set);
  79                 led_set_func = NULL;
  80                 old_vmaster_hook = NULL;
  81         }
  82 }
  83
  84 #else /* CONFIG_THINKPAD_ACPI */
  85
  86 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  87                                     const struct hda_fixup *fix, int action)
  88 {
  89 }
  90
  91 #endif /* CONFIG_THINKPAD_ACPI */