1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  hdac-ext-bus.c - HD-audio extended core bus functions.
4  *
5  *  Copyright (C) 2014-2015 Intel Corp
6  *  Author: Jeeja KP <jeeja.kp@intel.com>
7  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10  */
11 
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/io.h>
15 #include <sound/hdaudio_ext.h>
16 
17 MODULE_DESCRIPTION("HDA extended core");
18 MODULE_LICENSE("GPL v2");
19 
20 /**
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
26  *
27  * Returns 0 if successful, or a negative error code.
28  */
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)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)
32 {
33 	int ret;
34 
35 	ret = snd_hdac_bus_init(bus, dev, ops);
36 	if (ret < 0)
37 		return ret;
38 
39 	bus->ext_ops = ext_ops;
40 	/* FIXME:
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.
44 	 */
45 	bus->idx = 0;
46 	bus->cmd_dma_state = true;
47 
48 	return 0;
49 }
50 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);
51 
52 /**
53  * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
54  * @bus: the pointer to HDAC bus object
55  */
snd_hdac_ext_bus_exit(struct hdac_bus * bus)56 void snd_hdac_ext_bus_exit(struct hdac_bus *bus)
57 {
58 	snd_hdac_bus_exit(bus);
59 	WARN_ON(!list_empty(&bus->hlink_list));
60 }
61 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
62 
63 /**
64  * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
65  *
66  * @bus: the pointer to HDAC bus object
67  */
snd_hdac_ext_bus_device_remove(struct hdac_bus * bus)68 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
69 {
70 	struct hdac_device *codec, *__codec;
71 	/*
72 	 * we need to remove all the codec devices objects created in the
73 	 * snd_hdac_ext_bus_device_init
74 	 */
75 	list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
76 		snd_hdac_device_unregister(codec);
77 		put_device(&codec->dev);
78 	}
79 }
80 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
81 #define dev_to_hdac(dev) (container_of((dev), \
82 			struct hdac_device, dev))
83 
get_hdrv(struct device * dev)84 static inline struct hdac_driver *get_hdrv(struct device *dev)
85 {
86 	struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
87 	return hdrv;
88 }
89 
get_hdev(struct device * dev)90 static inline struct hdac_device *get_hdev(struct device *dev)
91 {
92 	struct hdac_device *hdev = dev_to_hdac_dev(dev);
93 	return hdev;
94 }
95 
hda_ext_drv_probe(struct device * dev)96 static int hda_ext_drv_probe(struct device *dev)
97 {
98 	return (get_hdrv(dev))->probe(get_hdev(dev));
99 }
100 
hdac_ext_drv_remove(struct device * dev)101 static int hdac_ext_drv_remove(struct device *dev)
102 {
103 	return (get_hdrv(dev))->remove(get_hdev(dev));
104 }
105 
hdac_ext_drv_shutdown(struct device * dev)106 static void hdac_ext_drv_shutdown(struct device *dev)
107 {
108 	return (get_hdrv(dev))->shutdown(get_hdev(dev));
109 }
110 
111 /**
112  * snd_hda_ext_driver_register - register a driver for ext hda devices
113  *
114  * @drv: ext hda driver structure
115  */
snd_hda_ext_driver_register(struct hdac_driver * drv)116 int snd_hda_ext_driver_register(struct hdac_driver *drv)
117 {
118 	drv->type = HDA_DEV_ASOC;
119 	drv->driver.bus = &snd_hda_bus_type;
120 	/* we use default match */
121 
122 	if (drv->probe)
123 		drv->driver.probe = hda_ext_drv_probe;
124 	if (drv->remove)
125 		drv->driver.remove = hdac_ext_drv_remove;
126 	if (drv->shutdown)
127 		drv->driver.shutdown = hdac_ext_drv_shutdown;
128 
129 	return driver_register(&drv->driver);
130 }
131 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
132 
133 /**
134  * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
135  *
136  * @drv: ext hda driver structure
137  */
snd_hda_ext_driver_unregister(struct hdac_driver * drv)138 void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
139 {
140 	driver_unregister(&drv->driver);
141 }
142 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);
143