sound/pci/hda/hda_bind.c

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