1 /* Helper functions for Thinkpad LED control;
2 * to be included from codec driver
5 #if IS_ENABLED(CONFIG_THINKPAD_ACPI)
7 #include <linux/acpi.h>
8 #include <linux/thinkpad_acpi.h>
10 static int (*led_set_func)(int, bool);
11 static void (*old_vmaster_hook)(void *, int);
13 static acpi_status acpi_check_cb(acpi_handle handle, u32 lvl, void *context,
16 bool *found = context;
21 static bool is_thinkpad(struct hda_codec *codec)
24 if (codec->subsystem_id >> 16 != 0x17aa)
26 if (ACPI_SUCCESS(acpi_get_devices("LEN0068", acpi_check_cb, &found, NULL)) && found)
29 return ACPI_SUCCESS(acpi_get_devices("IBM0068", acpi_check_cb, &found, NULL)) && found;
32 static void update_tpacpi_mute_led(void *private_data, int enabled)
35 old_vmaster_hook(private_data, enabled);
38 led_set_func(TPACPI_LED_MUTE, !enabled);
41 static void update_tpacpi_micmute_led(struct hda_codec *codec,
42 struct snd_ctl_elem_value *ucontrol)
44 if (!ucontrol || !led_set_func)
46 if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
47 /* TODO: How do I verify if it's a mono or stereo here? */
48 bool val = ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1];
49 led_set_func(TPACPI_LED_MICMUTE, !val);
53 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
54 const struct hda_fixup *fix, int action)
56 struct hda_gen_spec *spec = codec->spec;
57 bool removefunc = false;
59 if (action == HDA_FIXUP_ACT_PROBE) {
60 if (!is_thinkpad(codec))
63 led_set_func = symbol_request(tpacpi_led_set);
65 snd_printk(KERN_WARNING "Failed to find thinkpad-acpi symbol tpacpi_led_set\n");
70 if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
71 old_vmaster_hook = spec->vmaster_mute.hook;
72 spec->vmaster_mute.hook = update_tpacpi_mute_led;
75 if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) {
76 if (spec->num_adc_nids > 1)
77 snd_printdd("Skipping micmute LED control due to several ADCs");
79 spec->cap_sync_hook = update_tpacpi_micmute_led;
85 if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
86 symbol_put(tpacpi_led_set);
88 old_vmaster_hook = NULL;
92 #else /* CONFIG_THINKPAD_ACPI */
94 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
95 const struct hda_fixup *fix, int action)
99 #endif /* CONFIG_THINKPAD_ACPI */