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