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// SPDX-License-Identifier: GPL-2.0
/* 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 bool is_thinkpad(struct hda_codec *codec)
{
return (codec->core.subsystem_id >> 16 == 0x17aa) &&
(acpi_dev_found("LEN0068") || acpi_dev_found("LEN0268") ||
acpi_dev_found("IBM0068"));
}
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(struct hda_codec *codec)
{
struct hda_gen_spec *spec = codec->spec;
led_set_func(TPACPI_LED_MICMUTE, spec->micmute_led.led_value);
}
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) {
codec_warn(codec,
"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 &&
snd_hda_gen_add_micmute_led(codec,
update_tpacpi_micmute) > 0)
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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