bus.c

  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
 63/**
 64 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
 65 *
 66 * @bus: the pointer to HDAC bus object
 67 */
 68void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
 69{
 70	struct hdac_device *codec, *__codec;
 71	/*
 72	 * we need to remove all the codec devices objects created in the
 73	 * snd_hdac_ext_bus_device_init
 74	 */
 75	list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
 76		snd_hdac_device_unregister(codec);
 77		put_device(&codec->dev);
 78	}
 79}
 80EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
 81#define dev_to_hdac(dev) (container_of((dev), \
 82			struct hdac_device, dev))
 83
 84static inline struct hdac_driver *get_hdrv(struct device *dev)
 85{
 86	struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
 87	return hdrv;
 88}
 89
 90static inline struct hdac_device *get_hdev(struct device *dev)
 91{
 92	struct hdac_device *hdev = dev_to_hdac_dev(dev);
 93	return hdev;
 94}
 95
 96static int hda_ext_drv_probe(struct device *dev)
 97{
 98	return (get_hdrv(dev))->probe(get_hdev(dev));
 99}
100
101static int hdac_ext_drv_remove(struct device *dev)
102{
103	return (get_hdrv(dev))->remove(get_hdev(dev));
104}
105
106static void hdac_ext_drv_shutdown(struct device *dev)
107{
108	return (get_hdrv(dev))->shutdown(get_hdev(dev));
109}
110
111/**
112 * snd_hda_ext_driver_register - register a driver for ext hda devices
113 *
114 * @drv: ext hda driver structure
115 */
116int snd_hda_ext_driver_register(struct hdac_driver *drv)
117{
118	drv->type = HDA_DEV_ASOC;
119	drv->driver.bus = &snd_hda_bus_type;
120	/* we use default match */
121
122	if (drv->probe)
123		drv->driver.probe = hda_ext_drv_probe;
124	if (drv->remove)
125		drv->driver.remove = hdac_ext_drv_remove;
126	if (drv->shutdown)
127		drv->driver.shutdown = hdac_ext_drv_shutdown;
128
129	return driver_register(&drv->driver);
130}
131EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
132
133/**
134 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
135 *
136 * @drv: ext hda driver structure
137 */
138void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
139{
140	driver_unregister(&drv->driver);
141}
142EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);