root/sound/pci/hda/thinkpad_helper.c

DEFINITIONS

1. is_thinkpad
2. update_tpacpi_mute_led
3. hda_fixup_thinkpad_acpi
4. hda_fixup_thinkpad_acpi

   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) && IS_REACHABLE(CONFIG_LEDS_TRIGGER_AUDIO)
   7 
   8 #include <linux/acpi.h>
   9 #include <linux/leds.h>
  10 
  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         ledtrig_audio_set(LED_AUDIO_MUTE, enabled ? LED_OFF : LED_ON);
  26 }
  27 
  28 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  29                                     const struct hda_fixup *fix, int action)
  30 {
  31         struct hda_gen_spec *spec = codec->spec;
  32 
  33         if (action == HDA_FIXUP_ACT_PROBE) {
  34                 if (!is_thinkpad(codec))
  35                         return;
  36                 old_vmaster_hook = spec->vmaster_mute.hook;
  37                 spec->vmaster_mute.hook = update_tpacpi_mute_led;
  38                 snd_hda_gen_fixup_micmute_led(codec, fix, action);
  39         }
  40 }
  41 
  42 #else /* CONFIG_THINKPAD_ACPI */
  43 
  44 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  45                                     const struct hda_fixup *fix, int action)
  46 {
  47 }
  48 
  49 #endif /* CONFIG_THINKPAD_ACPI */