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 <sound/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 (codec->bus->core.ext_ops) { 85 if (WARN_ON(!codec->bus->core.ext_ops->hdev_attach)) 86 return -EINVAL; 87 return codec->bus->core.ext_ops->hdev_attach(&codec->core); 88 } 89 90 if (WARN_ON(!codec->preset)) 91 return -EINVAL; 92 93 err = snd_hda_codec_set_name(codec, codec->preset->name); 94 if (err < 0) 95 goto error; 96 err = snd_hdac_regmap_init(&codec->core); 97 if (err < 0) 98 goto error; 99 100 if (!try_module_get(owner)) { 101 err = -EINVAL; 102 goto error; 103 } 104 105 patch = (hda_codec_patch_t)codec->preset->driver_data; 106 if (patch) { 107 err = patch(codec); 108 if (err < 0) 109 goto error_module_put; 110 } 111 112 err = snd_hda_codec_build_pcms(codec); 113 if (err < 0) 114 goto error_module; 115 err = snd_hda_codec_build_controls(codec); 116 if (err < 0) 117 goto error_module; 118 if (codec->card->registered) { 119 err = snd_card_register(codec->card); 120 if (err < 0) 121 goto error_module; 122 snd_hda_codec_register(codec); 123 } 124 125 codec->core.lazy_cache = true; 126 return 0; 127 128 error_module: 129 if (codec->patch_ops.free) 130 codec->patch_ops.free(codec); 131 error_module_put: 132 module_put(owner); 133 134 error: 135 snd_hda_codec_cleanup_for_unbind(codec); 136 return err; 137 } 138 139 static int hda_codec_driver_remove(struct device *dev) 140 { 141 struct hda_codec *codec = dev_to_hda_codec(dev); 142 143 if (codec->bus->core.ext_ops) { 144 if (WARN_ON(!codec->bus->core.ext_ops->hdev_detach)) 145 return -EINVAL; 146 return codec->bus->core.ext_ops->hdev_detach(&codec->core); 147 } 148 149 if (codec->patch_ops.free) 150 codec->patch_ops.free(codec); 151 snd_hda_codec_cleanup_for_unbind(codec); 152 module_put(dev->driver->owner); 153 return 0; 154 } 155 156 static void hda_codec_driver_shutdown(struct device *dev) 157 { 158 struct hda_codec *codec = dev_to_hda_codec(dev); 159 160 if (!pm_runtime_suspended(dev) && codec->patch_ops.reboot_notify) 161 codec->patch_ops.reboot_notify(codec); 162 } 163 164 int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name, 165 struct module *owner) 166 { 167 drv->core.driver.name = name; 168 drv->core.driver.owner = owner; 169 drv->core.driver.bus = &snd_hda_bus_type; 170 drv->core.driver.probe = hda_codec_driver_probe; 171 drv->core.driver.remove = hda_codec_driver_remove; 172 drv->core.driver.shutdown = hda_codec_driver_shutdown; 173 drv->core.driver.pm = &hda_codec_driver_pm; 174 drv->core.type = HDA_DEV_LEGACY; 175 drv->core.match = hda_codec_match; 176 drv->core.unsol_event = hda_codec_unsol_event; 177 return driver_register(&drv->core.driver); 178 } 179 EXPORT_SYMBOL_GPL(__hda_codec_driver_register); 180 181 void hda_codec_driver_unregister(struct hda_codec_driver *drv) 182 { 183 driver_unregister(&drv->core.driver); 184 } 185 EXPORT_SYMBOL_GPL(hda_codec_driver_unregister); 186 187 static inline bool codec_probed(struct hda_codec *codec) 188 { 189 return device_attach(hda_codec_dev(codec)) > 0 && codec->preset; 190 } 191 192 /* try to auto-load codec module */ 193 static void request_codec_module(struct hda_codec *codec) 194 { 195 #ifdef MODULE 196 char modalias[32]; 197 const char *mod = NULL; 198 199 switch (codec->probe_id) { 200 case HDA_CODEC_ID_GENERIC_HDMI: 201 #if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI) 202 mod = "snd-hda-codec-hdmi"; 203 #endif 204 break; 205 case HDA_CODEC_ID_GENERIC: 206 #if IS_MODULE(CONFIG_SND_HDA_GENERIC) 207 mod = "snd-hda-codec-generic"; 208 #endif 209 break; 210 default: 211 snd_hdac_codec_modalias(&codec->core, modalias, sizeof(modalias)); 212 mod = modalias; 213 break; 214 } 215 216 if (mod) 217 request_module(mod); 218 #endif /* MODULE */ 219 } 220 221 /* try to auto-load and bind the codec module */ 222 static void codec_bind_module(struct hda_codec *codec) 223 { 224 #ifdef MODULE 225 request_codec_module(codec); 226 if (codec_probed(codec)) 227 return; 228 #endif 229 } 230 231 #if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI) 232 /* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */ 233 static bool is_likely_hdmi_codec(struct hda_codec *codec) 234 { 235 hda_nid_t nid; 236 237 for_each_hda_codec_node(nid, codec) { 238 unsigned int wcaps = get_wcaps(codec, nid); 239 switch (get_wcaps_type(wcaps)) { 240 case AC_WID_AUD_IN: 241 return false; /* HDMI parser supports only HDMI out */ 242 case AC_WID_AUD_OUT: 243 if (!(wcaps & AC_WCAP_DIGITAL)) 244 return false; 245 break; 246 } 247 } 248 return true; 249 } 250 #else 251 /* no HDMI codec parser support */ 252 #define is_likely_hdmi_codec(codec) false 253 #endif /* CONFIG_SND_HDA_CODEC_HDMI */ 254 255 static int codec_bind_generic(struct hda_codec *codec) 256 { 257 if (codec->probe_id) 258 return -ENODEV; 259 260 if (is_likely_hdmi_codec(codec)) { 261 codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI; 262 request_codec_module(codec); 263 if (codec_probed(codec)) 264 return 0; 265 } 266 267 codec->probe_id = HDA_CODEC_ID_GENERIC; 268 request_codec_module(codec); 269 if (codec_probed(codec)) 270 return 0; 271 return -ENODEV; 272 } 273 274 #if IS_ENABLED(CONFIG_SND_HDA_GENERIC) 275 #define is_generic_config(codec) \ 276 (codec->modelname && !strcmp(codec->modelname, "generic")) 277 #else 278 #define is_generic_config(codec) 0 279 #endif 280 281 /** 282 * snd_hda_codec_configure - (Re-)configure the HD-audio codec 283 * @codec: the HDA codec 284 * 285 * Start parsing of the given codec tree and (re-)initialize the whole 286 * patch instance. 287 * 288 * Returns 0 if successful or a negative error code. 289 */ 290 int snd_hda_codec_configure(struct hda_codec *codec) 291 { 292 int err; 293 294 if (is_generic_config(codec)) 295 codec->probe_id = HDA_CODEC_ID_GENERIC; 296 else 297 codec->probe_id = 0; 298 299 err = snd_hdac_device_register(&codec->core); 300 if (err < 0) 301 return err; 302 303 if (!codec->preset) 304 codec_bind_module(codec); 305 if (!codec->preset) { 306 err = codec_bind_generic(codec); 307 if (err < 0) { 308 codec_err(codec, "Unable to bind the codec\n"); 309 goto error; 310 } 311 } 312 313 return 0; 314 315 error: 316 snd_hdac_device_unregister(&codec->core); 317 return err; 318 } 319 EXPORT_SYMBOL_GPL(snd_hda_codec_configure); 320