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
17MODULE_DESCRIPTION("HDA extended core");
18MODULE_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 */
29int 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}
50EXPORT_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 */
56void 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}
61EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);
62
63static void default_release(struct device *dev)
64{
65	snd_hdac_ext_bus_device_exit(dev_to_hdac_dev(dev));
66}
67
68/**
69 * snd_hdac_ext_bus_device_init - initialize the HDA extended codec base device
70 * @bus: hdac bus to attach to
71 * @addr: codec address
72 * @hdev: hdac device to init
73 * @type: codec type (HDAC_DEV_*) to use for this device
74 *
75 * Returns zero for success or a negative error code.
76 */
77int snd_hdac_ext_bus_device_init(struct hdac_bus *bus, int addr,
78				 struct hdac_device *hdev, int type)
79{
80	char name[15];
81	int ret;
82
83	hdev->bus = bus;
84
85	snprintf(name, sizeof(name), "ehdaudio%dD%d", bus->idx, addr);
86
87	ret  = snd_hdac_device_init(hdev, bus, name, addr);
88	if (ret < 0) {
89		dev_err(bus->dev, "device init failed for hdac device\n");
90		return ret;
91	}
92	hdev->type = type;
93	hdev->dev.release = default_release;
94
95	ret = snd_hdac_device_register(hdev);
96	if (ret) {
97		dev_err(bus->dev, "failed to register hdac device\n");
98		snd_hdac_ext_bus_device_exit(hdev);
99		return ret;
100	}
101
102	return 0;
103}
104EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
105
106/**
107 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
108 * @hdev: hdac device to clean up
109 */
110void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
111{
112	snd_hdac_device_exit(hdev);
113}
114EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
115
116/**
117 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
118 *
119 * @bus: the pointer to HDAC bus object
120 */
121void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
122{
123	struct hdac_device *codec, *__codec;
124	/*
125	 * we need to remove all the codec devices objects created in the
126	 * snd_hdac_ext_bus_device_init
127	 */
128	list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
129		snd_hdac_device_unregister(codec);
130		put_device(&codec->dev);
131	}
132}
133EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
134#define dev_to_hdac(dev) (container_of((dev), \
135			struct hdac_device, dev))
136
137static inline struct hdac_driver *get_hdrv(struct device *dev)
138{
139	struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
140	return hdrv;
141}
142
143static inline struct hdac_device *get_hdev(struct device *dev)
144{
145	struct hdac_device *hdev = dev_to_hdac_dev(dev);
146	return hdev;
147}
148
149static int hda_ext_drv_probe(struct device *dev)
150{
151	return (get_hdrv(dev))->probe(get_hdev(dev));
152}
153
154static int hdac_ext_drv_remove(struct device *dev)
155{
156	return (get_hdrv(dev))->remove(get_hdev(dev));
157}
158
159static void hdac_ext_drv_shutdown(struct device *dev)
160{
161	return (get_hdrv(dev))->shutdown(get_hdev(dev));
162}
163
164/**
165 * snd_hda_ext_driver_register - register a driver for ext hda devices
166 *
167 * @drv: ext hda driver structure
168 */
169int snd_hda_ext_driver_register(struct hdac_driver *drv)
170{
171	drv->type = HDA_DEV_ASOC;
172	drv->driver.bus = &snd_hda_bus_type;
173	/* we use default match */
174
175	if (drv->probe)
176		drv->driver.probe = hda_ext_drv_probe;
177	if (drv->remove)
178		drv->driver.remove = hdac_ext_drv_remove;
179	if (drv->shutdown)
180		drv->driver.shutdown = hdac_ext_drv_shutdown;
181
182	return driver_register(&drv->driver);
183}
184EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
185
186/**
187 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
188 *
189 * @drv: ext hda driver structure
190 */
191void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
192{
193	driver_unregister(&drv->driver);
194}
195EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);
196