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