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 return err; 147 } 148 149 static int hda_codec_driver_remove(struct device *dev) 150 { 151 struct hda_codec *codec = dev_to_hda_codec(dev); 152 153 if (codec->bus->core.ext_ops) { 154 if (WARN_ON(!codec->bus->core.ext_ops->hdev_detach)) 155 return -EINVAL; 156 return codec->bus->core.ext_ops->hdev_detach(&codec->core); 157 } 158 159 if (codec->patch_ops.free) 160 codec->patch_ops.free(codec); 161 snd_hda_codec_cleanup_for_unbind(codec); 162 module_put(dev->driver->owner); 163 return 0; 164 } 165 166 static void hda_codec_driver_shutdown(struct device *dev) 167 { 168 struct hda_codec *codec = dev_to_hda_codec(dev); 169 170 if (!pm_runtime_suspended(dev) && codec->patch_ops.reboot_notify) 171 codec->patch_ops.reboot_notify(codec); 172 } 173 174 int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name, 175 struct module *owner) 176 { 177 drv->core.driver.name = name; 178 drv->core.driver.owner = owner; 179 drv->core.driver.bus = &snd_hda_bus_type; 180 drv->core.driver.probe = hda_codec_driver_probe; 181 drv->core.driver.remove = hda_codec_driver_remove; 182 drv->core.driver.shutdown = hda_codec_driver_shutdown; 183 drv->core.driver.pm = &hda_codec_driver_pm; 184 drv->core.type = HDA_DEV_LEGACY; 185 drv->core.match = hda_codec_match; 186 drv->core.unsol_event = hda_codec_unsol_event; 187 return driver_register(&drv->core.driver); 188 } 189 EXPORT_SYMBOL_GPL(__hda_codec_driver_register); 190 191 void hda_codec_driver_unregister(struct hda_codec_driver *drv) 192 { 193 driver_unregister(&drv->core.driver); 194 } 195 EXPORT_SYMBOL_GPL(hda_codec_driver_unregister); 196 197 static inline bool codec_probed(struct hda_codec *codec) 198 { 199 return device_attach(hda_codec_dev(codec)) > 0 && codec->preset; 200 } 201 202 /* try to auto-load codec module */ 203 static void request_codec_module(struct hda_codec *codec) 204 { 205 #ifdef MODULE 206 char modalias[32]; 207 const char *mod = NULL; 208 209 switch (codec->probe_id) { 210 case HDA_CODEC_ID_GENERIC_HDMI: 211 #if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI) 212 mod = "snd-hda-codec-hdmi"; 213 #endif 214 break; 215 case HDA_CODEC_ID_GENERIC: 216 #if IS_MODULE(CONFIG_SND_HDA_GENERIC) 217 mod = "snd-hda-codec-generic"; 218 #endif 219 break; 220 default: 221 snd_hdac_codec_modalias(&codec->core, modalias, sizeof(modalias)); 222 mod = modalias; 223 break; 224 } 225 226 if (mod) 227 request_module(mod); 228 #endif /* MODULE */ 229 } 230 231 /* try to auto-load and bind the codec module */ 232 static void codec_bind_module(struct hda_codec *codec) 233 { 234 #ifdef MODULE 235 request_codec_module(codec); 236 if (codec_probed(codec)) 237 return; 238 #endif 239 } 240 241 #if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI) 242 /* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */ 243 static bool is_likely_hdmi_codec(struct hda_codec *codec) 244 { 245 hda_nid_t nid; 246 247 for_each_hda_codec_node(nid, codec) { 248 unsigned int wcaps = get_wcaps(codec, nid); 249 switch (get_wcaps_type(wcaps)) { 250 case AC_WID_AUD_IN: 251 return false; /* HDMI parser supports only HDMI out */ 252 case AC_WID_AUD_OUT: 253 if (!(wcaps & AC_WCAP_DIGITAL)) 254 return false; 255 break; 256 } 257 } 258 return true; 259 } 260 #else 261 /* no HDMI codec parser support */ 262 #define is_likely_hdmi_codec(codec) false 263 #endif /* CONFIG_SND_HDA_CODEC_HDMI */ 264 265 static int codec_bind_generic(struct hda_codec *codec) 266 { 267 if (codec->probe_id) 268 return -ENODEV; 269 270 if (is_likely_hdmi_codec(codec)) { 271 codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI; 272 request_codec_module(codec); 273 if (codec_probed(codec)) 274 return 0; 275 } 276 277 codec->probe_id = HDA_CODEC_ID_GENERIC; 278 request_codec_module(codec); 279 if (codec_probed(codec)) 280 return 0; 281 return -ENODEV; 282 } 283 284 #if IS_ENABLED(CONFIG_SND_HDA_GENERIC) 285 #define is_generic_config(codec) \ 286 (codec->modelname && !strcmp(codec->modelname, "generic")) 287 #else 288 #define is_generic_config(codec) 0 289 #endif 290 291 /** 292 * snd_hda_codec_configure - (Re-)configure the HD-audio codec 293 * @codec: the HDA codec 294 * 295 * Start parsing of the given codec tree and (re-)initialize the whole 296 * patch instance. 297 * 298 * Returns 0 if successful or a negative error code. 299 */ 300 int snd_hda_codec_configure(struct hda_codec *codec) 301 { 302 int err; 303 304 if (is_generic_config(codec)) 305 codec->probe_id = HDA_CODEC_ID_GENERIC; 306 else 307 codec->probe_id = 0; 308 309 err = snd_hdac_device_register(&codec->core); 310 if (err < 0) 311 return err; 312 313 if (!codec->preset) 314 codec_bind_module(codec); 315 if (!codec->preset) { 316 err = codec_bind_generic(codec); 317 if (err < 0) { 318 codec_err(codec, "Unable to bind the codec\n"); 319 goto error; 320 } 321 } 322 323 return 0; 324 325 error: 326 snd_hdac_device_unregister(&codec->core); 327 return err; 328 } 329 EXPORT_SYMBOL_GPL(snd_hda_codec_configure); 330