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 static int (*dell_micmute_led_set_func)(int);
  10
  11 static void dell_micmute_update(struct hda_codec *codec)
  12 {
  13         struct hda_gen_spec *spec = codec->spec;
  14
  15         dell_micmute_led_set_func(spec->micmute_led.led_value);
  16 }
  17
  18 static void alc_fixup_dell_wmi(struct hda_codec *codec,
  19                                const struct hda_fixup *fix, int action)
  20 {
  21         bool removefunc = false;
  22
  23         if (action == HDA_FIXUP_ACT_PROBE) {
  24                 if (!dell_micmute_led_set_func)
  25                         dell_micmute_led_set_func = symbol_request(dell_micmute_led_set);
  26                 if (!dell_micmute_led_set_func) {
  27                         codec_warn(codec, "Failed to find dell wmi symbol dell_micmute_led_set\n");
  28                         return;
  29                 }
  30
  31                 removefunc = (dell_micmute_led_set_func(false) < 0) ||
  32                         (snd_hda_gen_add_micmute_led(codec,
  33                                                      dell_micmute_update) < 0);
  34         }
  35
  36         if (dell_micmute_led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
  37                 symbol_put(dell_micmute_led_set);
  38                 dell_micmute_led_set_func = NULL;
  39         }
  40 }
  41
  42 #else /* CONFIG_DELL_LAPTOP */
  43 static void alc_fixup_dell_wmi(struct hda_codec *codec,
  44                                const struct hda_fixup *fix, int action)
  45 {
  46 }
  47
  48 #endif /* CONFIG_DELL_LAPTOP */