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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * hdac-ext-bus.c - HD-audio extended core bus functions.4 *5 * Copyright (C) 2014-2015 Intel Corp6 * 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 bus22 * @bus: the pointer to HDAC bus object23 * @dev: device pointer24 * @ops: bus verb operators25 * @ext_ops: operators used for ASoC HDA codec drivers26 *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 more42 * buses, bus->idx should be greater than 0, but there needs to be a43 * 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 bus54 * @bus: the pointer to HDAC bus object55 */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 devices65 *66 * @bus: the pointer to HDAC bus object67 */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 the73 * snd_hdac_ext_bus_device_init74 */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 devices113 *114 * @drv: ext hda driver structure115 */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 devices135 *136 * @drv: ext hda driver structure137 */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);143