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 */ 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 */ 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 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 */ 68 void 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 } 80 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 81 #define dev_to_hdac(dev) (container_of((dev), \ 82 struct hdac_device, dev)) 83 84 static 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 90 static 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 96 static int hda_ext_drv_probe(struct device *dev) 97 { 98 return (get_hdrv(dev))->probe(get_hdev(dev)); 99 } 100 101 static int hdac_ext_drv_remove(struct device *dev) 102 { 103 return (get_hdrv(dev))->remove(get_hdev(dev)); 104 } 105 106 static 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 */ 116 int 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 } 131 EXPORT_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 */ 138 void snd_hda_ext_driver_unregister(struct hdac_driver *drv) 139 { 140 driver_unregister(&drv->driver); 141 } 142 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 143