1 // SPDX-License-Identifier: GPL-2.0-only
3 * hdac-ext-bus.c - HD-audio extended core bus functions.
5 * Copyright (C) 2014-2015 Intel Corp
6 * Author: Jeeja KP <jeeja.kp@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 #include <linux/module.h>
13 #include <linux/slab.h>
15 #include <sound/hdaudio_ext.h>
17 MODULE_DESCRIPTION("HDA extended core");
18 MODULE_LICENSE("GPL v2");
21 * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
22 * @bus: the pointer to HDAC bus object
23 * @dev: device pointer
24 * @ops: bus verb operators
25 * @ext_ops: operators used for ASoC HDA codec drivers
27 * Returns 0 if successful, or a negative error code.
29 int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
30 const struct hdac_bus_ops *ops,
31 const struct hdac_ext_bus_ops *ext_ops)
35 ret = snd_hdac_bus_init(bus, dev, ops);
39 bus->ext_ops = ext_ops;
41 * Currently only one bus is supported, if there is device with more
42 * buses, bus->idx should be greater than 0, but there needs to be a
43 * reliable way to always assign same number.
46 bus->cmd_dma_state = true;
50 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
53 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
54 * @bus: the pointer to HDAC bus object
56 void snd_hdac_ext_bus_exit(struct hdac_bus *bus)
58 snd_hdac_bus_exit(bus);
59 WARN_ON(!list_empty(&bus->hlink_list));
61 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
64 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
66 * @bus: the pointer to HDAC bus object
68 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
70 struct hdac_device *codec, *__codec;
72 * we need to remove all the codec devices objects created in the
73 * snd_hdac_ext_bus_device_init
75 list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
76 snd_hdac_device_unregister(codec);
77 put_device(&codec->dev);
80 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
81 #define dev_to_hdac(dev) (container_of((dev), \
82 struct hdac_device, dev))
84 static inline struct hdac_driver *get_hdrv(struct device *dev)
86 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
90 static inline struct hdac_device *get_hdev(struct device *dev)
92 struct hdac_device *hdev = dev_to_hdac_dev(dev);
96 static int hda_ext_drv_probe(struct device *dev)
98 return (get_hdrv(dev))->probe(get_hdev(dev));
101 static int hdac_ext_drv_remove(struct device *dev)
103 return (get_hdrv(dev))->remove(get_hdev(dev));
106 static void hdac_ext_drv_shutdown(struct device *dev)
108 return (get_hdrv(dev))->shutdown(get_hdev(dev));
112 * snd_hda_ext_driver_register - register a driver for ext hda devices
114 * @drv: ext hda driver structure
116 int snd_hda_ext_driver_register(struct hdac_driver *drv)
118 drv->type = HDA_DEV_ASOC;
119 drv->driver.bus = &snd_hda_bus_type;
120 /* we use default match */
123 drv->driver.probe = hda_ext_drv_probe;
125 drv->driver.remove = hdac_ext_drv_remove;
127 drv->driver.shutdown = hdac_ext_drv_shutdown;
129 return driver_register(&drv->driver);
131 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
134 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
136 * @drv: ext hda driver structure
138 void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
140 driver_unregister(&drv->driver);
142 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);