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); 308