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/* Helper functions for Thinkpad LED control;
* to be included from codec driver
*/
#if IS_ENABLED(CONFIG_THINKPAD_ACPI)
#include <linux/acpi.h>
#include <linux/thinkpad_acpi.h>
static int (*led_set_func)(int, bool);
static void (*old_vmaster_hook)(void *, int);
static acpi_status acpi_check_cb(acpi_handle handle, u32 lvl, void *context,
void **rv)
{
bool *found = context;
*found = true;
return AE_OK;
}
static bool is_thinkpad(struct hda_codec *codec)
{
bool found = false;
if (codec->subsystem_id >> 16 != 0x17aa)
return false;
if (ACPI_SUCCESS(acpi_get_devices("LEN0068", acpi_check_cb, &found, NULL)) && found)
return true;
found = false;
return ACPI_SUCCESS(acpi_get_devices("IBM0068", acpi_check_cb, &found, NULL)) && found;
}
static void update_tpacpi_mute_led(void *private_data, int enabled)
{
if (old_vmaster_hook)
old_vmaster_hook(private_data, enabled);
if (led_set_func)
led_set_func(TPACPI_LED_MUTE, !enabled);
}
static void update_tpacpi_micmute_led(struct hda_codec *codec,
struct snd_ctl_elem_value *ucontrol)
{
if (!ucontrol || !led_set_func)
return;
if (strcmp("Capture Switch", ucontrol->id.name) == 0 && ucontrol->id.index == 0) {
/* TODO: How do I verify if it's a mono or stereo here? */
bool val = ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1];
led_set_func(TPACPI_LED_MICMUTE, !val);
}
}
static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
const struct hda_fixup *fix, int action)
{
struct hda_gen_spec *spec = codec->spec;
bool removefunc = false;
if (action == HDA_FIXUP_ACT_PROBE) {
if (!is_thinkpad(codec))
return;
if (!led_set_func)
led_set_func = symbol_request(tpacpi_led_set);
if (!led_set_func) {
snd_printk(KERN_WARNING "Failed to find thinkpad-acpi symbol tpacpi_led_set\n");
return;
}
removefunc = true;
if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
old_vmaster_hook = spec->vmaster_mute.hook;
spec->vmaster_mute.hook = update_tpacpi_mute_led;
removefunc = false;
}
if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) {
if (spec->num_adc_nids > 1)
snd_printdd("Skipping micmute LED control due to several ADCs");
else {
spec->cap_sync_hook = update_tpacpi_micmute_led;
removefunc = false;
}
}
}
if (led_set_func && (action == HDA_FIXUP_ACT_FREE || removefunc)) {
symbol_put(tpacpi_led_set);
led_set_func = NULL;
old_vmaster_hook = NULL;
}
}
#else /* CONFIG_THINKPAD_ACPI */
static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
const struct hda_fixup *fix, int action)
{
}
#endif /* CONFIG_THINKPAD_ACPI */
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