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
default_release(struct device * dev)63 static 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 */
snd_hdac_ext_bus_device_init(struct hdac_bus * bus,int addr,struct hdac_device * hdev,int type)77 int 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 }
104 EXPORT_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 */
snd_hdac_ext_bus_device_exit(struct hdac_device * hdev)110 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
111 {
112 snd_hdac_device_exit(hdev);
113 }
114 EXPORT_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 */
snd_hdac_ext_bus_device_remove(struct hdac_bus * bus)121 void 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 }
133 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
134 #define dev_to_hdac(dev) (container_of((dev), \
135 struct hdac_device, dev))
136
get_hdrv(struct device * dev)137 static 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
get_hdev(struct device * dev)143 static 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
hda_ext_drv_probe(struct device * dev)149 static int hda_ext_drv_probe(struct device *dev)
150 {
151 return (get_hdrv(dev))->probe(get_hdev(dev));
152 }
153
hdac_ext_drv_remove(struct device * dev)154 static int hdac_ext_drv_remove(struct device *dev)
155 {
156 return (get_hdrv(dev))->remove(get_hdev(dev));
157 }
158
hdac_ext_drv_shutdown(struct device * dev)159 static 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 */
snd_hda_ext_driver_register(struct hdac_driver * drv)169 int 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 }
184 EXPORT_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 */
snd_hda_ext_driver_unregister(struct hdac_driver * drv)191 void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
192 {
193 driver_unregister(&drv->driver);
194 }
195 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);
196