ALSA: hda - Split Thinkpad ACPI-related code
Both patch_realtek.c and patch_conexant.c contain the fairy same code
snippet for supporting Thinkpad ACPI LED controls. Split them into
thinkpad_helper.c and include it from both places. Although this
isn't the best approach from the code size POV, the probability for
coexistence of both Realtek and Conexant codecs on a single machine is
pretty low, thus it'll end up with less memory footprint than
splitting to yet another module.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/thinkpad_helper.c b/sound/pci/hda/thinkpad_helper.c
new file mode 100644
index 0000000..8492b8a
--- /dev/null
+++ b/sound/pci/hda/thinkpad_helper.c
@@ -0,0 +1,99 @@
+/* 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 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)
+{
+ struct hda_codec *codec = private_data;
+ struct hda_gen_spec *spec = codec->spec;
+
+ if (spec->vmaster_mute.hook)
+ spec->vmaster_mute.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) {
+ 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;
+ }
+}
+
+#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 */