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 */ 92