--- /dev/null
+/*
+ * HD-audio codec driver binding
+ * Copyright (c) Takashi Iwai <tiwai@suse.de>
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <sound/core.h>
+#include "hda_codec.h"
+#include "hda_local.h"
+
+/*
+ * find a matching codec preset
+ */
+static int hda_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
+{
+ struct hda_codec *codec = container_of(dev, struct hda_codec, core);
+ struct hda_codec_driver *driver =
+ container_of(drv, struct hda_codec_driver, core);
+ const struct hda_codec_preset *preset;
+ /* check probe_id instead of vendor_id if set */
+ u32 id = codec->probe_id ? codec->probe_id : codec->core.vendor_id;
+
+ for (preset = driver->preset; preset->id; preset++) {
+ u32 mask = preset->mask;
+
+ if (preset->afg && preset->afg != codec->core.afg)
+ continue;
+ if (preset->mfg && preset->mfg != codec->core.mfg)
+ continue;
+ if (!mask)
+ mask = ~0;
+ if (preset->id == (id & mask) &&
+ (!preset->rev || preset->rev == codec->core.revision_id)) {
+ codec->preset = preset;
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/* process an unsolicited event */
+static void hda_codec_unsol_event(struct hdac_device *dev, unsigned int ev)
+{
+ struct hda_codec *codec = container_of(dev, struct hda_codec, core);
+
+ if (codec->patch_ops.unsol_event)
+ codec->patch_ops.unsol_event(codec, ev);
+}
+
+/* reset the codec name from the preset */
+static int codec_refresh_name(struct hda_codec *codec, const char *name)
+{
+ if (name) {
+ kfree(codec->core.chip_name);
+ codec->core.chip_name = kstrdup(name, GFP_KERNEL);
+ }
+ return codec->core.chip_name ? 0 : -ENOMEM;
+}
+
+static int hda_codec_driver_probe(struct device *dev)
+{
+ struct hda_codec *codec = dev_to_hda_codec(dev);
+ struct module *owner = dev->driver->owner;
+ int err;
+
+ if (WARN_ON(!codec->preset))
+ return -EINVAL;
+
+ err = codec_refresh_name(codec, codec->preset->name);
+ if (err < 0)
+ goto error;
+ err = snd_hdac_regmap_init(&codec->core);
+ if (err < 0)
+ goto error;
+
+ if (!try_module_get(owner)) {
+ err = -EINVAL;
+ goto error;
+ }
+
+ err = codec->preset->patch(codec);
+ if (err < 0)
+ goto error_module;
+
+ err = snd_hda_codec_build_pcms(codec);
+ if (err < 0)
+ goto error_module;
+ err = snd_hda_codec_build_controls(codec);
+ if (err < 0)
+ goto error_module;
+ if (codec->card->registered) {
+ err = snd_card_register(codec->card);
+ if (err < 0)
+ goto error_module;
+ snd_hda_codec_register(codec);
+ }
+
+ codec->core.lazy_cache = true;
+ return 0;
+
+ error_module:
+ module_put(owner);
+
+ error:
+ snd_hda_codec_cleanup_for_unbind(codec);
+ return err;
+}
+
+static int hda_codec_driver_remove(struct device *dev)
+{
+ struct hda_codec *codec = dev_to_hda_codec(dev);
+
+ if (codec->patch_ops.free)
+ codec->patch_ops.free(codec);
+ snd_hda_codec_cleanup_for_unbind(codec);
+ module_put(dev->driver->owner);
+ return 0;
+}
+
+static void hda_codec_driver_shutdown(struct device *dev)
+{
+ struct hda_codec *codec = dev_to_hda_codec(dev);
+
+ if (!pm_runtime_suspended(dev) && codec->patch_ops.reboot_notify)
+ codec->patch_ops.reboot_notify(codec);
+}
+
+int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
+ struct module *owner)
+{
+ drv->core.driver.name = name;
+ drv->core.driver.owner = owner;
+ drv->core.driver.bus = &snd_hda_bus_type;
+ drv->core.driver.probe = hda_codec_driver_probe;
+ drv->core.driver.remove = hda_codec_driver_remove;
+ drv->core.driver.shutdown = hda_codec_driver_shutdown;
+ drv->core.driver.pm = &hda_codec_driver_pm;
+ drv->core.type = HDA_DEV_LEGACY;
+ drv->core.match = hda_codec_match;
+ drv->core.unsol_event = hda_codec_unsol_event;
+ return driver_register(&drv->core.driver);
+}
+EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
+
+void hda_codec_driver_unregister(struct hda_codec_driver *drv)
+{
+ driver_unregister(&drv->core.driver);
+}
+EXPORT_SYMBOL_GPL(hda_codec_driver_unregister);
+
+static inline bool codec_probed(struct hda_codec *codec)
+{
+ return device_attach(hda_codec_dev(codec)) > 0 && codec->preset;
+}
+
+/* try to auto-load and bind the codec module */
+static void codec_bind_module(struct hda_codec *codec)
+{
+#ifdef MODULE
+ request_module("snd-hda-codec-id:%08x", codec->core.vendor_id);
+ if (codec_probed(codec))
+ return;
+ request_module("snd-hda-codec-id:%04x*",
+ (codec->core.vendor_id >> 16) & 0xffff);
+ if (codec_probed(codec))
+ return;
+#endif
+}
+
+#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
+/* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */
+static bool is_likely_hdmi_codec(struct hda_codec *codec)
+{
+ hda_nid_t nid;
+
+ for_each_hda_codec_node(nid, codec) {
+ unsigned int wcaps = get_wcaps(codec, nid);
+ switch (get_wcaps_type(wcaps)) {
+ case AC_WID_AUD_IN:
+ return false; /* HDMI parser supports only HDMI out */
+ case AC_WID_AUD_OUT:
+ if (!(wcaps & AC_WCAP_DIGITAL))
+ return false;
+ break;
+ }
+ }
+ return true;
+}
+#else
+/* no HDMI codec parser support */
+#define is_likely_hdmi_codec(codec) false
+#endif /* CONFIG_SND_HDA_CODEC_HDMI */
+
+static int codec_bind_generic(struct hda_codec *codec)
+{
+ if (codec->probe_id)
+ return -ENODEV;
+
+ if (is_likely_hdmi_codec(codec)) {
+ codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI;
+#if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
+ request_module("snd-hda-codec-hdmi");
+#endif
+ if (codec_probed(codec))
+ return 0;
+ }
+
+ codec->probe_id = HDA_CODEC_ID_GENERIC;
+#if IS_MODULE(CONFIG_SND_HDA_GENERIC)
+ request_module("snd-hda-codec-generic");
+#endif
+ if (codec_probed(codec))
+ return 0;
+ return -ENODEV;
+}
+
+#if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
+#define is_generic_config(codec) \
+ (codec->modelname && !strcmp(codec->modelname, "generic"))
+#else
+#define is_generic_config(codec) 0
+#endif
+
+/**
+ * snd_hda_codec_configure - (Re-)configure the HD-audio codec
+ * @codec: the HDA codec
+ *
+ * Start parsing of the given codec tree and (re-)initialize the whole
+ * patch instance.
+ *
+ * Returns 0 if successful or a negative error code.
+ */
+int snd_hda_codec_configure(struct hda_codec *codec)
+{
+ int err;
+
+ if (is_generic_config(codec))
+ codec->probe_id = HDA_CODEC_ID_GENERIC;
+ else
+ codec->probe_id = 0;
+
+ err = snd_hdac_device_register(&codec->core);
+ if (err < 0)
+ return err;
+
+ if (!codec->preset)
+ codec_bind_module(codec);
+ if (!codec->preset) {
+ err = codec_bind_generic(codec);
+ if (err < 0) {
+ codec_err(codec, "Unable to bind the codec\n");
+ goto error;
+ }
+ }
+
+ /* audio codec should override the mixer name */
+ if (codec->core.afg || !*codec->card->mixername)
+ snprintf(codec->card->mixername,
+ sizeof(codec->card->mixername), "%s %s",
+ codec->core.vendor_name, codec->core.chip_name);
+ return 0;
+
+ error:
+ snd_hdac_device_unregister(&codec->core);
+ return err;
+}
+EXPORT_SYMBOL_GPL(snd_hda_codec_configure);
Code Review / kvmfornfv.git / blobdiff