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(struct hda_codec *codec)
  31 {
  32         struct hda_gen_spec *spec = codec->spec;
  33
  34         led_set_func(TPACPI_LED_MICMUTE, spec->micmute_led.led_value);
  35 }
  36
  37 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  38                                     const struct hda_fixup *fix, int action)
  39 {
  40         struct hda_gen_spec *spec = codec->spec;
  41         bool removefunc = false;
  42
  43         if (action == HDA_FIXUP_ACT_PROBE) {
  44                 if (!is_thinkpad(codec))
  45                         return;
  46                 if (!led_set_func)
  47                         led_set_func = symbol_request(tpacpi_led_set);
  48                 if (!led_set_func) {
  49                         codec_warn(codec,
  50                                    "Failed to find thinkpad-acpi symbol tpacpi_led_set\n");
  51                         return;
  52                 }
  53
  54                 removefunc = true;
  55                 if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
  56                         old_vmaster_hook = spec->vmaster_mute.hook;
  57                         spec->vmaster_mute.hook = update_tpacpi_mute_led;
  58                         removefunc = false;
  59                 }
  60                 if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0 &&
  61                     !snd_hda_gen_add_micmute_led(codec,
  62                                                  update_tpacpi_micmute))
  63                         removefunc = false;
  64         }
  65
  66         if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
  67                 symbol_put(tpacpi_led_set);
  68                 led_set_func = NULL;
  69                 old_vmaster_hook = NULL;
  70         }
  71 }
  72
  73 #else /* CONFIG_THINKPAD_ACPI */
  74
  75 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
  76                                     const struct hda_fixup *fix, int action)
  77 {
  78 }
  79
  80 #endif /* CONFIG_THINKPAD_ACPI */