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
10static int (*led_set_func)(int, bool);
11static void (*old_vmaster_hook)(void *, int);
12
13static 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
21static bool is_thinkpad(struct hda_codec *codec)
22{
23	bool found = false;
24	if (codec->core.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
32static 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
41static 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
54static 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			codec_warn(codec,
67				   "Failed to find thinkpad-acpi symbol tpacpi_led_set\n");
68			return;
69		}
70
71		removefunc = true;
72		if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
73			old_vmaster_hook = spec->vmaster_mute.hook;
74			spec->vmaster_mute.hook = update_tpacpi_mute_led;
75			removefunc = false;
76		}
77		if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) {
78			if (spec->num_adc_nids > 1)
79				codec_dbg(codec,
80					  "Skipping micmute LED control due to several ADCs");
81			else {
82				spec->cap_sync_hook = update_tpacpi_micmute_led;
83				removefunc = false;
84			}
85		}
86	}
87
88	if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
89		symbol_put(tpacpi_led_set);
90		led_set_func = NULL;
91		old_vmaster_hook = NULL;
92	}
93}
94
95#else /* CONFIG_THINKPAD_ACPI */
96
97static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
98				    const struct hda_fixup *fix, int action)
99{
100}
101
102#endif /* CONFIG_THINKPAD_ACPI */
103