ALSA: hda - Fix incorrect clearance of thinkpad_acpi hooks
[muen/linux.git] / sound / pci / hda / thinkpad_helper.c
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))
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 */