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 and bind the codec module */ 178 static void codec_bind_module(struct hda_codec *codec) 179 { 180 #ifdef MODULE 181 char modalias[32]; 182 183 snd_hdac_codec_modalias(&codec->core, modalias, sizeof(modalias)); 184 request_module(modalias); 185 if (codec_probed(codec)) 186 return; 187 #endif 188 } 189 190 #if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI) 191 /* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */ 192 static bool is_likely_hdmi_codec(struct hda_codec *codec) 193 { 194 hda_nid_t nid; 195 196 for_each_hda_codec_node(nid, codec) { 197 unsigned int wcaps = get_wcaps(codec, nid); 198 switch (get_wcaps_type(wcaps)) { 199 case AC_WID_AUD_IN: 200 return false; /* HDMI parser supports only HDMI out */ 201 case AC_WID_AUD_OUT: 202 if (!(wcaps & AC_WCAP_DIGITAL)) 203 return false; 204 break; 205 } 206 } 207 return true; 208 } 209 #else 210 /* no HDMI codec parser support */ 211 #define is_likely_hdmi_codec(codec) false 212 #endif /* CONFIG_SND_HDA_CODEC_HDMI */ 213 214 static int codec_bind_generic(struct hda_codec *codec) 215 { 216 if (codec->probe_id) 217 return -ENODEV; 218 219 if (is_likely_hdmi_codec(codec)) { 220 codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI; 221 #if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI) 222 request_module("snd-hda-codec-hdmi"); 223 #endif 224 if (codec_probed(codec)) 225 return 0; 226 } 227 228 codec->probe_id = HDA_CODEC_ID_GENERIC; 229 #if IS_MODULE(CONFIG_SND_HDA_GENERIC) 230 request_module("snd-hda-codec-generic"); 231 #endif 232 if (codec_probed(codec)) 233 return 0; 234 return -ENODEV; 235 } 236 237 #if IS_ENABLED(CONFIG_SND_HDA_GENERIC) 238 #define is_generic_config(codec) \ 239 (codec->modelname && !strcmp(codec->modelname, "generic")) 240 #else 241 #define is_generic_config(codec) 0 242 #endif 243 244 /** 245 * snd_hda_codec_configure - (Re-)configure the HD-audio codec 246 * @codec: the HDA codec 247 * 248 * Start parsing of the given codec tree and (re-)initialize the whole 249 * patch instance. 250 * 251 * Returns 0 if successful or a negative error code. 252 */ 253 int snd_hda_codec_configure(struct hda_codec *codec) 254 { 255 int err; 256 257 if (is_generic_config(codec)) 258 codec->probe_id = HDA_CODEC_ID_GENERIC; 259 else 260 codec->probe_id = 0; 261 262 err = snd_hdac_device_register(&codec->core); 263 if (err < 0) 264 return err; 265 266 if (!codec->preset) 267 codec_bind_module(codec); 268 if (!codec->preset) { 269 err = codec_bind_generic(codec); 270 if (err < 0) { 271 codec_err(codec, "Unable to bind the codec\n"); 272 goto error; 273 } 274 } 275 276 return 0; 277 278 error: 279 snd_hdac_device_unregister(&codec->core); 280 return err; 281 } 282 EXPORT_SYMBOL_GPL(snd_hda_codec_configure); 283