xref: /openbmc/linux/sound/pci/hda/hda_bind.c (revision 2c684d89)
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