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 <sound/core.h>
  13 #include "hda_codec.h"
  14 #include "hda_local.h"
  15
  16 /* codec vendor labels */
  17 struct hda_vendor_id {
  18         unsigned int id;
  19         const char *name;
  20 };
  21
  22 static struct hda_vendor_id hda_vendor_ids[] = {
  23         { 0x1002, "ATI" },
  24         { 0x1013, "Cirrus Logic" },
  25         { 0x1057, "Motorola" },
  26         { 0x1095, "Silicon Image" },
  27         { 0x10de, "Nvidia" },
  28         { 0x10ec, "Realtek" },
  29         { 0x1102, "Creative" },
  30         { 0x1106, "VIA" },
  31         { 0x111d, "IDT" },
  32         { 0x11c1, "LSI" },
  33         { 0x11d4, "Analog Devices" },
  34         { 0x13f6, "C-Media" },
  35         { 0x14f1, "Conexant" },
  36         { 0x17e8, "Chrontel" },
  37         { 0x1854, "LG" },
  38         { 0x1aec, "Wolfson Microelectronics" },
  39         { 0x1af4, "QEMU" },
  40         { 0x434d, "C-Media" },
  41         { 0x8086, "Intel" },
  42         { 0x8384, "SigmaTel" },
  43         {} /* terminator */
  44 };
  45
  46 /*
  47  * find a matching codec preset
  48  */
  49 static int hda_bus_match(struct device *dev, struct device_driver *drv)
  50 {
  51         struct hda_codec *codec = container_of(dev, struct hda_codec, dev);
  52         struct hda_codec_driver *driver =
  53                 container_of(drv, struct hda_codec_driver, driver);
  54         const struct hda_codec_preset *preset;
  55         /* check probe_id instead of vendor_id if set */
  56         u32 id = codec->probe_id ? codec->probe_id : codec->vendor_id;
  57
  58         for (preset = driver->preset; preset->id; preset++) {
  59                 u32 mask = preset->mask;
  60
  61                 if (preset->afg && preset->afg != codec->afg)
  62                         continue;
  63                 if (preset->mfg && preset->mfg != codec->mfg)
  64                         continue;
  65                 if (!mask)
  66                         mask = ~0;
  67                 if (preset->id == (id & mask) &&
  68                     (!preset->rev || preset->rev == codec->revision_id)) {
  69                         codec->preset = preset;
  70                         return 1;
  71                 }
  72         }
  73         return 0;
  74 }
  75
  76 /* reset the codec name from the preset */
  77 static int codec_refresh_name(struct hda_codec *codec, const char *name)
  78 {
  79         char tmp[16];
  80
  81         kfree(codec->chip_name);
  82         if (!name) {
  83                 sprintf(tmp, "ID %x", codec->vendor_id & 0xffff);
  84                 name = tmp;
  85         }
  86         codec->chip_name = kstrdup(name, GFP_KERNEL);
  87         return codec->chip_name ? 0 : -ENOMEM;
  88 }
  89
  90 static int hda_codec_driver_probe(struct device *dev)
  91 {
  92         struct hda_codec *codec = dev_to_hda_codec(dev);
  93         struct module *owner = dev->driver->owner;
  94         int err;
  95
  96         if (WARN_ON(!codec->preset))
  97                 return -EINVAL;
  98
  99         err = codec_refresh_name(codec, codec->preset->name);
 100         if (err < 0)
 101                 goto error;
 102
 103         if (!try_module_get(owner)) {
 104                 err = -EINVAL;
 105                 goto error;
 106         }
 107
 108         err = codec->preset->patch(codec);
 109         if (err < 0) {
 110                 module_put(owner);
 111                 goto error;
 112         }
 113
 114         return 0;
 115
 116  error:
 117         codec->preset = NULL;
 118         memset(&codec->patch_ops, 0, sizeof(codec->patch_ops));
 119         return err;
 120 }
 121
 122 static int hda_codec_driver_remove(struct device *dev)
 123 {
 124         struct hda_codec *codec = dev_to_hda_codec(dev);
 125
 126         if (codec->patch_ops.free)
 127                 codec->patch_ops.free(codec);
 128         codec->preset = NULL;
 129         memset(&codec->patch_ops, 0, sizeof(codec->patch_ops));
 130         module_put(dev->driver->owner);
 131         return 0;
 132 }
 133
 134 int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
 135                                struct module *owner)
 136 {
 137         drv->driver.name = name;
 138         drv->driver.owner = owner;
 139         drv->driver.bus = &snd_hda_bus_type;
 140         drv->driver.probe = hda_codec_driver_probe;
 141         drv->driver.remove = hda_codec_driver_remove;
 142         drv->driver.pm = &hda_codec_driver_pm;
 143         return driver_register(&drv->driver);
 144 }
 145 EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
 146
 147 void hda_codec_driver_unregister(struct hda_codec_driver *drv)
 148 {
 149         driver_unregister(&drv->driver);
 150 }
 151 EXPORT_SYMBOL_GPL(hda_codec_driver_unregister);
 152
 153 static inline bool codec_probed(struct hda_codec *codec)
 154 {
 155         return device_attach(hda_codec_dev(codec)) > 0 && codec->preset;
 156 }
 157
 158 /* try to auto-load and bind the codec module */
 159 static void codec_bind_module(struct hda_codec *codec)
 160 {
 161 #ifdef MODULE
 162         request_module("snd-hda-codec-id:%08x", codec->vendor_id);
 163         if (codec_probed(codec))
 164                 return;
 165         request_module("snd-hda-codec-id:%04x*",
 166                        (codec->vendor_id >> 16) & 0xffff);
 167         if (codec_probed(codec))
 168                 return;
 169 #endif
 170 }
 171
 172 /* store the codec vendor name */
 173 static int get_codec_vendor_name(struct hda_codec *codec)
 174 {
 175         const struct hda_vendor_id *c;
 176         const char *vendor = NULL;
 177         u16 vendor_id = codec->vendor_id >> 16;
 178         char tmp[16];
 179
 180         for (c = hda_vendor_ids; c->id; c++) {
 181                 if (c->id == vendor_id) {
 182                         vendor = c->name;
 183                         break;
 184                 }
 185         }
 186         if (!vendor) {
 187                 sprintf(tmp, "Generic %04x", vendor_id);
 188                 vendor = tmp;
 189         }
 190         codec->vendor_name = kstrdup(vendor, GFP_KERNEL);
 191         if (!codec->vendor_name)
 192                 return -ENOMEM;
 193         return 0;
 194 }
 195
 196 #if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
 197 /* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */
 198 static bool is_likely_hdmi_codec(struct hda_codec *codec)
 199 {
 200         hda_nid_t nid = codec->start_nid;
 201         int i;
 202
 203         for (i = 0; i < codec->num_nodes; i++, nid++) {
 204                 unsigned int wcaps = get_wcaps(codec, nid);
 205                 switch (get_wcaps_type(wcaps)) {
 206                 case AC_WID_AUD_IN:
 207                         return false; /* HDMI parser supports only HDMI out */
 208                 case AC_WID_AUD_OUT:
 209                         if (!(wcaps & AC_WCAP_DIGITAL))
 210                                 return false;
 211                         break;
 212                 }
 213         }
 214         return true;
 215 }
 216 #else
 217 /* no HDMI codec parser support */
 218 #define is_likely_hdmi_codec(codec)     false
 219 #endif /* CONFIG_SND_HDA_CODEC_HDMI */
 220
 221 static int codec_bind_generic(struct hda_codec *codec)
 222 {
 223         if (codec->probe_id)
 224                 return -ENODEV;
 225
 226         if (is_likely_hdmi_codec(codec)) {
 227                 codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI;
 228 #if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
 229                 request_module("snd-hda-codec-hdmi");
 230 #endif
 231                 if (codec_probed(codec))
 232                         return 0;
 233         }
 234
 235         codec->probe_id = HDA_CODEC_ID_GENERIC;
 236 #if IS_MODULE(CONFIG_SND_HDA_GENERIC)
 237         request_module("snd-hda-codec-generic");
 238 #endif
 239         if (codec_probed(codec))
 240                 return 0;
 241         return -ENODEV;
 242 }
 243
 244 #if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
 245 #define is_generic_config(codec) \
 246         (codec->modelname && !strcmp(codec->modelname, "generic"))
 247 #else
 248 #define is_generic_config(codec)        0
 249 #endif
 250
 251 /**
 252  * snd_hda_codec_configure - (Re-)configure the HD-audio codec
 253  * @codec: the HDA codec
 254  *
 255  * Start parsing of the given codec tree and (re-)initialize the whole
 256  * patch instance.
 257  *
 258  * Returns 0 if successful or a negative error code.
 259  */
 260 int snd_hda_codec_configure(struct hda_codec *codec)
 261 {
 262         int err;
 263
 264         if (!codec->vendor_name) {
 265                 err = get_codec_vendor_name(codec);
 266                 if (err < 0)
 267                         return err;
 268         }
 269
 270         if (is_generic_config(codec))
 271                 codec->probe_id = HDA_CODEC_ID_GENERIC;
 272         else
 273                 codec->probe_id = 0;
 274
 275         err = device_add(hda_codec_dev(codec));
 276         if (err < 0)
 277                 return err;
 278
 279         if (!codec->preset)
 280                 codec_bind_module(codec);
 281         if (!codec->preset) {
 282                 err = codec_bind_generic(codec);
 283                 if (err < 0) {
 284                         codec_err(codec, "Unable to bind the codec\n");
 285                         goto error;
 286                 }
 287         }
 288
 289         /* audio codec should override the mixer name */
 290         if (codec->afg || !*codec->card->mixername)
 291                 snprintf(codec->card->mixername,
 292                          sizeof(codec->card->mixername),
 293                          "%s %s", codec->vendor_name, codec->chip_name);
 294         return 0;
 295
 296  error:
 297         device_del(hda_codec_dev(codec));
 298         return err;
 299 }
 300 EXPORT_SYMBOL_GPL(snd_hda_codec_configure);
 301
 302 /*
 303  * bus registration
 304  */
 305 struct bus_type snd_hda_bus_type = {
 306         .name = "hdaudio",
 307         .match = hda_bus_match,
 308 };
 309
 310 static int __init hda_codec_init(void)
 311 {
 312         return bus_register(&snd_hda_bus_type);
 313 }
 314
 315 static void __exit hda_codec_exit(void)
 316 {
 317         bus_unregister(&snd_hda_bus_type);
 318 }
 319
 320 module_init(hda_codec_init);
 321 module_exit(hda_codec_exit);