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
is_thinkpad(struct hda_codec * codec)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
update_tpacpi_mute_led(void * private_data,int enabled)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
update_tpacpi_micmute(struct hda_codec * codec)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
hda_fixup_thinkpad_acpi(struct hda_codec * codec,const struct hda_fixup * fix,int action)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
hda_fixup_thinkpad_acpi(struct hda_codec * codec,const struct hda_fixup * fix,int action)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
