sound/pci/hda/hda_bind.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HD-audio codec driver binding
   4  * Copyright (c) Takashi Iwai <tiwai@suse.de>
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/slab.h>
   9 #include <linux/mutex.h>
  10 #include <linux/module.h>
  11 #include <linux/export.h>
  12 #include <linux/pm.h>
  13 #include <linux/pm_runtime.h>
  14 #include <sound/core.h>
  15 #include <sound/hda_codec.h>
  16 #include "hda_local.h"
  17
  18 /*
  19  * find a matching codec id
  20  */
  21 static int hda_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
  22 {
  23         struct hda_codec *codec = container_of(dev, struct hda_codec, core);
  24         struct hda_codec_driver *driver =
  25                 container_of(drv, struct hda_codec_driver, core);
  26         const struct hda_device_id *list;
  27         /* check probe_id instead of vendor_id if set */
  28         u32 id = codec->probe_id ? codec->probe_id : codec->core.vendor_id;
  29         u32 rev_id = codec->core.revision_id;
  30
  31         for (list = driver->id; list->vendor_id; list++) {
  32                 if (list->vendor_id == id &&
  33                     (!list->rev_id || list->rev_id == rev_id)) {
  34                         codec->preset = list;
  35                         return 1;
  36                 }
  37         }
  38         return 0;
  39 }
  40
  41 /* process an unsolicited event */
  42 static void hda_codec_unsol_event(struct hdac_device *dev, unsigned int ev)
  43 {
  44         struct hda_codec *codec = container_of(dev, struct hda_codec, core);
  45
  46         /* ignore unsol events during shutdown */
  47         if (codec->bus->shutdown)
  48                 return;
  49
  50         /* ignore unsol events during system suspend/resume */
  51         if (codec->core.dev.power.power_state.event != PM_EVENT_ON)
  52                 return;
  53
  54         if (codec->patch_ops.unsol_event)
  55                 codec->patch_ops.unsol_event(codec, ev);
  56 }
  57
  58 /**
  59  * snd_hda_codec_set_name - set the codec name
  60  * @codec: the HDA codec
  61  * @name: name string to set
  62  */
  63 int snd_hda_codec_set_name(struct hda_codec *codec, const char *name)
  64 {
  65         int err;
  66
  67         if (!name)
  68                 return 0;
  69         err = snd_hdac_device_set_chip_name(&codec->core, name);
  70         if (err < 0)
  71                 return err;
  72
  73         /* update the mixer name */
  74         if (!*codec->card->mixername ||
  75             codec->bus->mixer_assigned >= codec->core.addr) {
  76                 snprintf(codec->card->mixername,
  77                          sizeof(codec->card->mixername), "%s %s",
  78                          codec->core.vendor_name, codec->core.chip_name);
  79                 codec->bus->mixer_assigned = codec->core.addr;
  80         }
  81
  82         return 0;
  83 }
  84 EXPORT_SYMBOL_GPL(snd_hda_codec_set_name);
  85
  86 static int hda_codec_driver_probe(struct device *dev)
  87 {
  88         struct hda_codec *codec = dev_to_hda_codec(dev);
  89         struct module *owner = dev->driver->owner;
  90         hda_codec_patch_t patch;
  91         int err;
  92
  93         if (codec->bus->core.ext_ops) {
  94                 if (WARN_ON(!codec->bus->core.ext_ops->hdev_attach))
  95                         return -EINVAL;
  96                 return codec->bus->core.ext_ops->hdev_attach(&codec->core);
  97         }
  98
  99         if (WARN_ON(!codec->preset))
 100                 return -EINVAL;
 101
 102         err = snd_hda_codec_set_name(codec, codec->preset->name);
 103         if (err < 0)
 104                 goto error;
 105         err = snd_hdac_regmap_init(&codec->core);
 106         if (err < 0)
 107                 goto error;
 108
 109         if (!try_module_get(owner)) {
 110                 err = -EINVAL;
 111                 goto error;
 112         }
 113
 114         patch = (hda_codec_patch_t)codec->preset->driver_data;
 115         if (patch) {
 116                 err = patch(codec);
 117                 if (err < 0)
 118                         goto error_module_put;
 119         }
 120
 121         err = snd_hda_codec_build_pcms(codec);
 122         if (err < 0)
 123                 goto error_module;
 124         err = snd_hda_codec_build_controls(codec);
 125         if (err < 0)
 126                 goto error_module;
 127         /* only register after the bus probe finished; otherwise it's racy */
 128         if (!codec->bus->bus_probing && codec->card->registered) {
 129                 err = snd_card_register(codec->card);
 130                 if (err < 0)
 131                         goto error_module;
 132                 snd_hda_codec_register(codec);
 133         }
 134
 135         codec->core.lazy_cache = true;
 136         return 0;
 137
 138  error_module:
 139         if (codec->patch_ops.free)
 140                 codec->patch_ops.free(codec);
 141  error_module_put:
 142         module_put(owner);
 143
 144  error:
 145         snd_hda_codec_cleanup_for_unbind(codec);
 146         codec->preset = NULL;
 147         return err;
 148 }
 149
 150 static int hda_codec_driver_remove(struct device *dev)
 151 {
 152         struct hda_codec *codec = dev_to_hda_codec(dev);
 153
 154         if (codec->bus->core.ext_ops) {
 155                 if (WARN_ON(!codec->bus->core.ext_ops->hdev_detach))
 156                         return -EINVAL;
 157                 return codec->bus->core.ext_ops->hdev_detach(&codec->core);
 158         }
 159
 160         if (codec->patch_ops.free)
 161                 codec->patch_ops.free(codec);
 162         snd_hda_codec_cleanup_for_unbind(codec);
 163         codec->preset = NULL;
 164         module_put(dev->driver->owner);
 165         return 0;
 166 }
 167
 168 static void hda_codec_driver_shutdown(struct device *dev)
 169 {
 170         struct hda_codec *codec = dev_to_hda_codec(dev);
 171
 172         if (!pm_runtime_suspended(dev) && codec->patch_ops.reboot_notify)
 173                 codec->patch_ops.reboot_notify(codec);
 174 }
 175
 176 int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
 177                                struct module *owner)
 178 {
 179         drv->core.driver.name = name;
 180         drv->core.driver.owner = owner;
 181         drv->core.driver.bus = &snd_hda_bus_type;
 182         drv->core.driver.probe = hda_codec_driver_probe;
 183         drv->core.driver.remove = hda_codec_driver_remove;
 184         drv->core.driver.shutdown = hda_codec_driver_shutdown;
 185         drv->core.driver.pm = &hda_codec_driver_pm;
 186         drv->core.type = HDA_DEV_LEGACY;
 187         drv->core.match = hda_codec_match;
 188         drv->core.unsol_event = hda_codec_unsol_event;
 189         return driver_register(&drv->core.driver);
 190 }
 191 EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
 192
 193 void hda_codec_driver_unregister(struct hda_codec_driver *drv)
 194 {
 195         driver_unregister(&drv->core.driver);
 196 }
 197 EXPORT_SYMBOL_GPL(hda_codec_driver_unregister);
 198
 199 static inline bool codec_probed(struct hda_codec *codec)
 200 {
 201         return device_attach(hda_codec_dev(codec)) > 0 && codec->preset;
 202 }
 203
 204 /* try to auto-load codec module */
 205 static void request_codec_module(struct hda_codec *codec)
 206 {
 207 #ifdef MODULE
 208         char modalias[32];
 209         const char *mod = NULL;
 210
 211         switch (codec->probe_id) {
 212         case HDA_CODEC_ID_GENERIC_HDMI:
 213 #if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
 214                 mod = "snd-hda-codec-hdmi";
 215 #endif
 216                 break;
 217         case HDA_CODEC_ID_GENERIC:
 218 #if IS_MODULE(CONFIG_SND_HDA_GENERIC)
 219                 mod = "snd-hda-codec-generic";
 220 #endif
 221                 break;
 222         default:
 223                 snd_hdac_codec_modalias(&codec->core, modalias, sizeof(modalias));
 224                 mod = modalias;
 225                 break;
 226         }
 227
 228         if (mod)
 229                 request_module(mod);
 230 #endif /* MODULE */
 231 }
 232
 233 /* try to auto-load and bind the codec module */
 234 static void codec_bind_module(struct hda_codec *codec)
 235 {
 236 #ifdef MODULE
 237         request_codec_module(codec);
 238         if (codec_probed(codec))
 239                 return;
 240 #endif
 241 }
 242
 243 #if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
 244 /* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */
 245 static bool is_likely_hdmi_codec(struct hda_codec *codec)
 246 {
 247         hda_nid_t nid;
 248
 249         for_each_hda_codec_node(nid, codec) {
 250                 unsigned int wcaps = get_wcaps(codec, nid);
 251                 switch (get_wcaps_type(wcaps)) {
 252                 case AC_WID_AUD_IN:
 253                         return false; /* HDMI parser supports only HDMI out */
 254                 case AC_WID_AUD_OUT:
 255                         if (!(wcaps & AC_WCAP_DIGITAL))
 256                                 return false;
 257                         break;
 258                 }
 259         }
 260         return true;
 261 }
 262 #else
 263 /* no HDMI codec parser support */
 264 #define is_likely_hdmi_codec(codec)     false
 265 #endif /* CONFIG_SND_HDA_CODEC_HDMI */
 266
 267 static int codec_bind_generic(struct hda_codec *codec)
 268 {
 269         if (codec->probe_id)
 270                 return -ENODEV;
 271
 272         if (is_likely_hdmi_codec(codec)) {
 273                 codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI;
 274                 request_codec_module(codec);
 275                 if (codec_probed(codec))
 276                         return 0;
 277         }
 278
 279         codec->probe_id = HDA_CODEC_ID_GENERIC;
 280         request_codec_module(codec);
 281         if (codec_probed(codec))
 282                 return 0;
 283         return -ENODEV;
 284 }
 285
 286 #if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
 287 #define is_generic_config(codec) \
 288         (codec->modelname && !strcmp(codec->modelname, "generic"))
 289 #else
 290 #define is_generic_config(codec)        0
 291 #endif
 292
 293 /**
 294  * snd_hda_codec_configure - (Re-)configure the HD-audio codec
 295  * @codec: the HDA codec
 296  *
 297  * Start parsing of the given codec tree and (re-)initialize the whole
 298  * patch instance.
 299  *
 300  * Returns 0 if successful or a negative error code.
 301  */
 302 int snd_hda_codec_configure(struct hda_codec *codec)
 303 {
 304         int err;
 305
 306         if (codec->configured)
 307                 return 0;
 308
 309         if (is_generic_config(codec))
 310                 codec->probe_id = HDA_CODEC_ID_GENERIC;
 311         else
 312                 codec->probe_id = 0;
 313
 314         if (!device_is_registered(&codec->core.dev)) {
 315                 err = snd_hdac_device_register(&codec->core);
 316                 if (err < 0)
 317                         return err;
 318         }
 319
 320         if (!codec->preset)
 321                 codec_bind_module(codec);
 322         if (!codec->preset) {
 323                 err = codec_bind_generic(codec);
 324                 if (err < 0) {
 325                         codec_dbg(codec, "Unable to bind the codec\n");
 326                         return err;
 327                 }
 328         }
 329
 330         codec->configured = 1;
 331         return 0;
 332 }
 333 EXPORT_SYMBOL_GPL(snd_hda_codec_configure);