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 */
hda_codec_match(struct hdac_device * dev,struct hdac_driver * drv)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 */
hda_codec_unsol_event(struct hdac_device * dev,unsigned int ev)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 */
snd_hda_codec_set_name(struct hda_codec * codec,const char * name)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
hda_codec_driver_probe(struct device * dev)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
hda_codec_driver_remove(struct device * dev)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
hda_codec_driver_shutdown(struct device * dev)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
__hda_codec_driver_register(struct hda_codec_driver * drv,const char * name,struct module * owner)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
hda_codec_driver_unregister(struct hda_codec_driver * drv)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
codec_probed(struct hda_codec * codec)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 */
request_codec_module(struct hda_codec * codec)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 */
codec_bind_module(struct hda_codec * codec)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 */
is_likely_hdmi_codec(struct hda_codec * codec)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
codec_bind_generic(struct hda_codec * codec)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 */
snd_hda_codec_configure(struct hda_codec * codec)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
