1 // SPDX-License-Identifier: GPL-2.0-only
3 * hdac-ext-bus.c - HD-audio extended core bus functions.
5 * Copyright (C) 2014-2015 Intel Corp
6 * Author: Jeeja KP <jeeja.kp@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12 #include <linux/module.h>
13 #include <linux/slab.h>
15 #include <sound/hdaudio_ext.h>
17 MODULE_DESCRIPTION("HDA extended core");
18 MODULE_LICENSE("GPL v2");
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
27 * Returns 0 if successful, or a negative error code.
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
)
35 ret
= snd_hdac_bus_init(bus
, dev
, ops
);
39 bus
->ext_ops
= ext_ops
;
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.
46 bus
->cmd_dma_state
= true;
50 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init
);
53 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
54 * @ebus: the pointer to extended bus object
56 void snd_hdac_ext_bus_exit(struct hdac_bus
*bus
)
58 snd_hdac_bus_exit(bus
);
59 WARN_ON(!list_empty(&bus
->hlink_list
));
61 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit
);
63 static void default_release(struct device
*dev
)
65 snd_hdac_ext_bus_device_exit(container_of(dev
, struct hdac_device
, dev
));
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
73 * Returns zero for success or a negative error code.
75 int snd_hdac_ext_bus_device_init(struct hdac_bus
*bus
, int addr
,
76 struct hdac_device
*hdev
)
83 snprintf(name
, sizeof(name
), "ehdaudio%dD%d", bus
->idx
, addr
);
85 ret
= snd_hdac_device_init(hdev
, bus
, name
, addr
);
87 dev_err(bus
->dev
, "device init failed for hdac device\n");
90 hdev
->type
= HDA_DEV_ASOC
;
91 hdev
->dev
.release
= default_release
;
93 ret
= snd_hdac_device_register(hdev
);
95 dev_err(bus
->dev
, "failed to register hdac device\n");
96 snd_hdac_ext_bus_device_exit(hdev
);
102 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init
);
105 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
106 * @hdev: hdac device to clean up
108 void snd_hdac_ext_bus_device_exit(struct hdac_device
*hdev
)
110 snd_hdac_device_exit(hdev
);
112 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit
);
115 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
117 * @ebus: HD-audio extended bus
119 void snd_hdac_ext_bus_device_remove(struct hdac_bus
*bus
)
121 struct hdac_device
*codec
, *__codec
;
123 * we need to remove all the codec devices objects created in the
124 * snd_hdac_ext_bus_device_init
126 list_for_each_entry_safe(codec
, __codec
, &bus
->codec_list
, list
) {
127 snd_hdac_device_unregister(codec
);
128 put_device(&codec
->dev
);
131 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove
);
132 #define dev_to_hdac(dev) (container_of((dev), \
133 struct hdac_device, dev))
135 static inline struct hdac_driver
*get_hdrv(struct device
*dev
)
137 struct hdac_driver
*hdrv
= drv_to_hdac_driver(dev
->driver
);
141 static inline struct hdac_device
*get_hdev(struct device
*dev
)
143 struct hdac_device
*hdev
= dev_to_hdac_dev(dev
);
147 static int hda_ext_drv_probe(struct device
*dev
)
149 return (get_hdrv(dev
))->probe(get_hdev(dev
));
152 static int hdac_ext_drv_remove(struct device
*dev
)
154 return (get_hdrv(dev
))->remove(get_hdev(dev
));
157 static void hdac_ext_drv_shutdown(struct device
*dev
)
159 return (get_hdrv(dev
))->shutdown(get_hdev(dev
));
163 * snd_hda_ext_driver_register - register a driver for ext hda devices
165 * @drv: ext hda driver structure
167 int snd_hda_ext_driver_register(struct hdac_driver
*drv
)
169 drv
->type
= HDA_DEV_ASOC
;
170 drv
->driver
.bus
= &snd_hda_bus_type
;
171 /* we use default match */
174 drv
->driver
.probe
= hda_ext_drv_probe
;
176 drv
->driver
.remove
= hdac_ext_drv_remove
;
178 drv
->driver
.shutdown
= hdac_ext_drv_shutdown
;
180 return driver_register(&drv
->driver
);
182 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register
);
185 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
187 * @drv: ext hda driver structure
189 void snd_hda_ext_driver_unregister(struct hdac_driver
*drv
)
191 driver_unregister(&drv
->driver
);
193 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister
);