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 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 * @bus: hdac bus to attach to 71 * @addr: codec address 72 * @hdev: hdac device to init 73 * 74 * Returns zero for success or a negative error code. 75 */ 76 int snd_hdac_ext_bus_device_init(struct hdac_bus *bus, int addr, 77 struct hdac_device *hdev) 78 { 79 char name[15]; 80 int ret; 81 82 hdev->bus = bus; 83 84 snprintf(name, sizeof(name), "ehdaudio%dD%d", bus->idx, addr); 85 86 ret = snd_hdac_device_init(hdev, bus, name, addr); 87 if (ret < 0) { 88 dev_err(bus->dev, "device init failed for hdac device\n"); 89 return ret; 90 } 91 hdev->type = HDA_DEV_ASOC; 92 hdev->dev.release = default_release; 93 94 ret = snd_hdac_device_register(hdev); 95 if (ret) { 96 dev_err(bus->dev, "failed to register hdac device\n"); 97 snd_hdac_ext_bus_device_exit(hdev); 98 return ret; 99 } 100 101 return 0; 102 } 103 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_init); 104 105 /** 106 * snd_hdac_ext_bus_device_exit - clean up a HD-audio extended codec base device 107 * @hdev: hdac device to clean up 108 */ 109 void snd_hdac_ext_bus_device_exit(struct hdac_device *hdev) 110 { 111 snd_hdac_device_exit(hdev); 112 } 113 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_exit); 114 115 /** 116 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices 117 * 118 * @bus: the pointer to HDAC bus object 119 */ 120 void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus) 121 { 122 struct hdac_device *codec, *__codec; 123 /* 124 * we need to remove all the codec devices objects created in the 125 * snd_hdac_ext_bus_device_init 126 */ 127 list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) { 128 snd_hdac_device_unregister(codec); 129 put_device(&codec->dev); 130 } 131 } 132 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove); 133 #define dev_to_hdac(dev) (container_of((dev), \ 134 struct hdac_device, dev)) 135 136 static inline struct hdac_driver *get_hdrv(struct device *dev) 137 { 138 struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver); 139 return hdrv; 140 } 141 142 static inline struct hdac_device *get_hdev(struct device *dev) 143 { 144 struct hdac_device *hdev = dev_to_hdac_dev(dev); 145 return hdev; 146 } 147 148 static int hda_ext_drv_probe(struct device *dev) 149 { 150 return (get_hdrv(dev))->probe(get_hdev(dev)); 151 } 152 153 static int hdac_ext_drv_remove(struct device *dev) 154 { 155 return (get_hdrv(dev))->remove(get_hdev(dev)); 156 } 157 158 static void hdac_ext_drv_shutdown(struct device *dev) 159 { 160 return (get_hdrv(dev))->shutdown(get_hdev(dev)); 161 } 162 163 /** 164 * snd_hda_ext_driver_register - register a driver for ext hda devices 165 * 166 * @drv: ext hda driver structure 167 */ 168 int snd_hda_ext_driver_register(struct hdac_driver *drv) 169 { 170 drv->type = HDA_DEV_ASOC; 171 drv->driver.bus = &snd_hda_bus_type; 172 /* we use default match */ 173 174 if (drv->probe) 175 drv->driver.probe = hda_ext_drv_probe; 176 if (drv->remove) 177 drv->driver.remove = hdac_ext_drv_remove; 178 if (drv->shutdown) 179 drv->driver.shutdown = hdac_ext_drv_shutdown; 180 181 return driver_register(&drv->driver); 182 } 183 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_register); 184 185 /** 186 * snd_hda_ext_driver_unregister - unregister a driver for ext hda devices 187 * 188 * @drv: ext hda driver structure 189 */ 190 void snd_hda_ext_driver_unregister(struct hdac_driver *drv) 191 { 192 driver_unregister(&drv->driver); 193 } 194 EXPORT_SYMBOL_GPL(snd_hda_ext_driver_unregister); 195