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) > 0) 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 */ 81