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