sound/hda/ext/hdac_ext_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
  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  * @ebus: the pointer to extended bus object
  23  * @dev: device pointer
  24  * @ops: bus verb operators
  25  * default ops
  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  * @ebus: the pointer to extended 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 static void default_release(struct device *dev)
  64 {
  65         snd_hdac_ext_bus_device_exit(container_of(dev, struct hdac_device, dev));
  66 }
  67
  68 /**
  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
  72  *
  73  * Returns zero for success or a negative error code.
  74  */
  75 int snd_hdac_ext_bus_device_init(struct hdac_bus *bus, int addr,
  76                                         struct hdac_device *hdev)
  77 {
  78         char name[15];
  79         int ret;
  80
  81         hdev->bus = bus;
  82
  83         snprintf(name, sizeof(name), "ehdaudio%dD%d", bus->idx, addr);
  84
  85         ret  = snd_hdac_device_init(hdev, bus, name, addr);
  86         if (ret < 0) {
  87                 dev_err(bus->dev, "device init failed for hdac device\n");
  88                 return ret;
  89         }
  90         hdev->type = HDA_DEV_ASOC;
  91         hdev->dev.release = default_release;
  92
  93         ret = snd_hdac_device_register(hdev);
  94         if (ret) {
  95                 dev_err(bus->dev, "failed to register hdac device\n");
  96                 snd_hdac_ext_bus_device_exit(hdev);
  97                 return ret;
  98         }
  99
 100         return 0;
 101 }
 102 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init);
 103
 104 /**
 105  * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device
 106  * @hdev: hdac device to clean up
 107  */
 108 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev)
 109 {
 110         snd_hdac_device_exit(hdev);
 111 }
 112 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit);
 113
 114 /**
 115  * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
 116  *
 117  * @ebus: HD-audio extended bus
 118  */
 119 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
 120 {
 121         struct hdac_device *codec, *__codec;
 122         /*
 123          * we need to remove all the codec devices objects created in the
 124          * snd_hdac_ext_bus_device_init
 125          */
 126         list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
 127                 snd_hdac_device_unregister(codec);
 128                 put_device(&codec->dev);
 129         }
 130 }
 131 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
 132 #define dev_to_hdac(dev) (container_of((dev), \
 133                         struct hdac_device, dev))
 134
 135 static inline struct hdac_driver *get_hdrv(struct device *dev)
 136 {
 137         struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
 138         return hdrv;
 139 }
 140
 141 static inline struct hdac_device *get_hdev(struct device *dev)
 142 {
 143         struct hdac_device *hdev = dev_to_hdac_dev(dev);
 144         return hdev;
 145 }
 146
 147 static int hda_ext_drv_probe(struct device *dev)
 148 {
 149         return (get_hdrv(dev))->probe(get_hdev(dev));
 150 }
 151
 152 static int hdac_ext_drv_remove(struct device *dev)
 153 {
 154         return (get_hdrv(dev))->remove(get_hdev(dev));
 155 }
 156
 157 static void hdac_ext_drv_shutdown(struct device *dev)
 158 {
 159         return (get_hdrv(dev))->shutdown(get_hdev(dev));
 160 }
 161
 162 /**
 163  * snd_hda_ext_driver_register - register a driver for ext hda devices
 164  *
 165  * @drv: ext hda driver structure
 166  */
 167 int snd_hda_ext_driver_register(struct hdac_driver *drv)
 168 {
 169         drv->type = HDA_DEV_ASOC;
 170         drv->driver.bus = &snd_hda_bus_type;
 171         /* we use default match */
 172
 173         if (drv->probe)
 174                 drv->driver.probe = hda_ext_drv_probe;
 175         if (drv->remove)
 176                 drv->driver.remove = hdac_ext_drv_remove;
 177         if (drv->shutdown)
 178                 drv->driver.shutdown = hdac_ext_drv_shutdown;
 179
 180         return driver_register(&drv->driver);
 181 }
 182 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register);
 183
 184 /**
 185  * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices
 186  *
 187  * @drv: ext hda driver structure
 188  */
 189 void snd_hda_ext_driver_unregister(struct hdac_driver *drv)
 190 {
 191         driver_unregister(&drv->driver);
 192 }
 193 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister);