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Diffstat (limited to 'sound/hda/ext/hdac_ext_bus.c')
-rw-r--r--sound/hda/ext/hdac_ext_bus.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c
new file mode 100644
index 000000000..6004ea1c3
--- /dev/null
+++ b/sound/hda/ext/hdac_ext_bus.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * hdac-ext-bus.c - HD-audio extended core bus functions.
+ *
+ * Copyright (C) 2014-2015 Intel Corp
+ * Author: Jeeja KP <jeeja.kp@intel.com>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <sound/hdaudio_ext.h>
+
+MODULE_DESCRIPTION("HDA extended core");
+MODULE_LICENSE("GPL v2");
+
+/**
+ * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
+ * @bus: the pointer to HDAC bus object
+ * @dev: device pointer
+ * @ops: bus verb operators
+ * @ext_ops: operators used for ASoC HDA codec drivers
+ *
+ * Returns 0 if successful, or a negative error code.
+ */
+int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
+ const struct hdac_bus_ops *ops,
+ const struct hdac_ext_bus_ops *ext_ops)
+{
+ int ret;
+
+ ret = snd_hdac_bus_init(bus, dev, ops);
+ if (ret < 0)
+ return ret;
+
+ bus->ext_ops = ext_ops;
+ /* FIXME:
+ * Currently only one bus is supported, if there is device with more
+ * buses, bus->idx should be greater than 0, but there needs to be a
+ * reliable way to always assign same number.
+ */
+ bus->idx = 0;
+ bus->cmd_dma_state = true;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
+
+/**
+ * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
+ * @bus: the pointer to HDAC bus object
+ */
+void snd_hdac_ext_bus_exit(struct hdac_bus *bus)
+{
+ snd_hdac_bus_exit(bus);
+ WARN_ON(!list_empty(&bus->hlink_list));
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
+
+/**
+ * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
+ *
+ * @bus: the pointer to HDAC bus object
+ */
+void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
+{
+ struct hdac_device *codec, *__codec;
+ /*
+ * we need to remove all the codec devices objects created in the
+ * snd_hdac_ext_bus_device_init
+ */
+ list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
+ snd_hdac_device_unregister(codec);
+ put_device(&codec->dev);
+ }
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
+#define dev_to_hdac(dev) (container_of((dev), \
+ struct hdac_device, dev))
+
+static inline struct hdac_driver *get_hdrv(struct device *dev)
+{
+ struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
+ return hdrv;
+}
+
+static inline struct hdac_device *get_hdev(struct device *dev)
+{
+ struct hdac_device *hdev = dev_to_hdac_dev(dev);
+ return hdev;
+}
+
+static int hda_ext_drv_probe(struct device *dev)
+{
+ return (get_hdrv(dev))->probe(get_hdev(dev));
+}
+
+static int hdac_ext_drv_remove(struct device *dev)
+{
+ return (get_hdrv(dev))->remove(get_hdev(dev));
+}
+
+static void hdac_ext_drv_shutdown(struct device *dev)
+{
+ return (get_hdrv(dev))->shutdown(get_hdev(dev));
+}
+
+/**
+ * snd_hda_ext_driver_register - register a driver for ext hda devices
+ *
+ * @drv: ext hda driver structure
+ */
+int snd_hda_ext_driver_register(struct hdac_driver *drv)
+{
+ drv->type = HDA_DEV_ASOC;
+ drv->driver.bus = &snd_hda_bus_type;
+ /* we use default match */
+
+ if (drv->probe)
+ drv->driver.probe = hda_ext_drv_probe;
+ if (drv->remove)
+ drv->driver.remove = hdac_ext_drv_remove;
+ if (drv->shutdown)
+ drv->driver.shutdown = hdac_ext_drv_shutdown;
+
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
+
+/**
+ * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
+ *
+ * @drv: ext hda driver structure
+ */
+void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);