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