1 /* Helper functions for Thinkpad LED control; 2 * to be included from codec driver 3 */ 4 5 #if IS_ENABLED(CONFIG_THINKPAD_ACPI) 6 7 #include <linux/acpi.h> 8 #include <linux/thinkpad_acpi.h> 9 10 static int (*led_set_func)(int, bool); 11 static void (*old_vmaster_hook)(void *, int); 12 13 static acpi_status acpi_check_cb(acpi_handle handle, u32 lvl, void *context, 14 void **rv) 15 { 16 bool *found = context; 17 *found = true; 18 return AE_OK; 19 } 20 21 static bool is_thinkpad(struct hda_codec *codec) 22 { 23 bool found = false; 24 if (codec->subsystem_id >> 16 != 0x17aa) 25 return false; 26 if (ACPI_SUCCESS(acpi_get_devices("LEN0068", acpi_check_cb, &found, NULL)) && found) 27 return true; 28 found = false; 29 return ACPI_SUCCESS(acpi_get_devices("IBM0068", acpi_check_cb, &found, NULL)) && found; 30 } 31 32 static void update_tpacpi_mute_led(void *private_data, int enabled) 33 { 34 if (old_vmaster_hook) 35 old_vmaster_hook(private_data, enabled); 36 37 if (led_set_func) 38 led_set_func(TPACPI_LED_MUTE, !enabled); 39 } 40 41 static void update_tpacpi_micmute_led(struct hda_codec *codec, 42 struct snd_kcontrol *kcontrol, 43 struct snd_ctl_elem_value *ucontrol) 44 { 45 if (!ucontrol || !led_set_func) 46 return; 47 if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) { 48 /* TODO: How do I verify if it's a mono or stereo here? */ 49 bool val = ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1]; 50 led_set_func(TPACPI_LED_MICMUTE, !val); 51 } 52 } 53 54 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec, 55 const struct hda_fixup *fix, int action) 56 { 57 struct hda_gen_spec *spec = codec->spec; 58 bool removefunc = false; 59 60 if (action == HDA_FIXUP_ACT_PROBE) { 61 if (!is_thinkpad(codec)) 62 return; 63 if (!led_set_func) 64 led_set_func = symbol_request(tpacpi_led_set); 65 if (!led_set_func) { 66 snd_printk(KERN_WARNING "Failed to find thinkpad-acpi symbol tpacpi_led_set\n"); 67 return; 68 } 69 70 removefunc = true; 71 if (led_set_func(TPACPI_LED_MUTE, false) >= 0) { 72 old_vmaster_hook = spec->vmaster_mute.hook; 73 spec->vmaster_mute.hook = update_tpacpi_mute_led; 74 removefunc = false; 75 } 76 if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) { 77 if (spec->num_adc_nids > 1) 78 snd_printdd("Skipping micmute LED control due to several ADCs"); 79 else { 80 spec->cap_sync_hook = update_tpacpi_micmute_led; 81 removefunc = false; 82 } 83 } 84 } 85 86 if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) { 87 symbol_put(tpacpi_led_set); 88 led_set_func = NULL; 89 old_vmaster_hook = NULL; 90 } 91 } 92 93 #else /* CONFIG_THINKPAD_ACPI */ 94 95 static void hda_fixup_thinkpad_acpi(struct hda_codec *codec, 96 const struct hda_fixup *fix, int action) 97 { 98 } 99 100 #endif /* CONFIG_THINKPAD_ACPI */ 101