1 // SPDX-License-Identifier: GPL-2.0
2 // hdac_component.c - routines for sync between HD-A core and DRM driver
4 #include <linux/init.h>
5 #include <linux/module.h>
7 #include <linux/component.h>
8 #include <sound/core.h>
9 #include <sound/hdaudio.h>
10 #include <sound/hda_component.h>
11 #include <sound/hda_register.h>
13 static void hdac_acomp_release(struct device *dev, void *res)
17 static struct drm_audio_component *hdac_get_acomp(struct device *dev)
19 return devres_find(dev, hdac_acomp_release, NULL, NULL);
23 * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
25 * @enable: enable or disable the wakeup
27 * This function is supposed to be used only by a HD-audio controller
28 * driver that needs the interaction with graphics driver.
30 * This function should be called during the chip reset, also called at
31 * resume for updating STATESTS register read.
33 * Returns zero for success or a negative error code.
35 int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
37 struct drm_audio_component *acomp = bus->audio_component;
39 if (!acomp || !acomp->ops)
42 if (!acomp->ops->codec_wake_override)
45 dev_dbg(bus->dev, "%s codec wakeup\n",
46 enable ? "enable" : "disable");
48 acomp->ops->codec_wake_override(acomp->dev, enable);
52 EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
55 * snd_hdac_display_power - Power up / down the power refcount
57 * @enable: power up or down
59 * This function is supposed to be used only by a HD-audio controller
60 * driver that needs the interaction with graphics driver.
62 * This function manages a refcount and calls the get_power() and
63 * put_power() ops accordingly, toggling the codec wakeup, too.
65 * Returns zero for success or a negative error code.
67 int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
69 struct drm_audio_component *acomp = bus->audio_component;
71 if (!acomp || !acomp->ops)
74 dev_dbg(bus->dev, "display power %s\n",
75 enable ? "enable" : "disable");
78 if (!bus->drm_power_refcount++) {
79 if (acomp->ops->get_power)
80 acomp->ops->get_power(acomp->dev);
81 snd_hdac_set_codec_wakeup(bus, true);
82 snd_hdac_set_codec_wakeup(bus, false);
85 WARN_ON(!bus->drm_power_refcount);
86 if (!--bus->drm_power_refcount)
87 if (acomp->ops->put_power)
88 acomp->ops->put_power(acomp->dev);
93 EXPORT_SYMBOL_GPL(snd_hdac_display_power);
96 * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
98 * @nid: the pin widget NID
99 * @dev_id: device identifier
100 * @rate: the sample rate to set
102 * This function is supposed to be used only by a HD-audio controller
103 * driver that needs the interaction with graphics driver.
105 * This function sets N/CTS value based on the given sample rate.
106 * Returns zero for success, or a negative error code.
108 int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
109 int dev_id, int rate)
111 struct hdac_bus *bus = codec->bus;
112 struct drm_audio_component *acomp = bus->audio_component;
115 if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
118 if (acomp->audio_ops && acomp->audio_ops->pin2port) {
119 port = acomp->audio_ops->pin2port(codec, nid);
124 return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate);
126 EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
129 * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
131 * @nid: the pin widget NID
132 * @dev_id: device identifier
133 * @audio_enabled: the pointer to store the current audio state
134 * @buffer: the buffer pointer to store ELD bytes
135 * @max_bytes: the max bytes to be stored on @buffer
137 * This function is supposed to be used only by a HD-audio controller
138 * driver that needs the interaction with graphics driver.
140 * This function queries the current state of the audio on the given
141 * digital port and fetches the ELD bytes onto the given buffer.
142 * It returns the number of bytes for the total ELD data, zero for
143 * invalid ELD, or a negative error code.
145 * The return size is the total bytes required for the whole ELD bytes,
146 * thus it may be over @max_bytes. If it's over @max_bytes, it implies
147 * that only a part of ELD bytes have been fetched.
149 int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
150 bool *audio_enabled, char *buffer, int max_bytes)
152 struct hdac_bus *bus = codec->bus;
153 struct drm_audio_component *acomp = bus->audio_component;
156 if (!acomp || !acomp->ops || !acomp->ops->get_eld)
160 if (acomp->audio_ops && acomp->audio_ops->pin2port) {
161 port = acomp->audio_ops->pin2port(codec, nid);
166 return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled,
169 EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
171 static int hdac_component_master_bind(struct device *dev)
173 struct drm_audio_component *acomp = hdac_get_acomp(dev);
179 ret = component_bind_all(dev, acomp);
183 if (WARN_ON(!(acomp->dev && acomp->ops))) {
188 /* pin the module to avoid dynamic unbinding, but only if given */
189 if (!try_module_get(acomp->ops->owner)) {
194 if (acomp->audio_ops && acomp->audio_ops->master_bind) {
195 ret = acomp->audio_ops->master_bind(dev, acomp);
203 module_put(acomp->ops->owner);
205 component_unbind_all(dev, acomp);
210 static void hdac_component_master_unbind(struct device *dev)
212 struct drm_audio_component *acomp = hdac_get_acomp(dev);
214 if (acomp->audio_ops && acomp->audio_ops->master_unbind)
215 acomp->audio_ops->master_unbind(dev, acomp);
216 module_put(acomp->ops->owner);
217 component_unbind_all(dev, acomp);
218 WARN_ON(acomp->ops || acomp->dev);
221 static const struct component_master_ops hdac_component_master_ops = {
222 .bind = hdac_component_master_bind,
223 .unbind = hdac_component_master_unbind,
227 * snd_hdac_acomp_register_notifier - Register audio component ops
229 * @aops: audio component ops
231 * This function is supposed to be used only by a HD-audio controller
232 * driver that needs the interaction with graphics driver.
234 * This function sets the given ops to be called by the graphics driver.
236 * Returns zero for success or a negative error code.
238 int snd_hdac_acomp_register_notifier(struct hdac_bus *bus,
239 const struct drm_audio_component_audio_ops *aops)
241 if (!bus->audio_component)
244 bus->audio_component->audio_ops = aops;
247 EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier);
250 * snd_hdac_acomp_init - Initialize audio component
252 * @match_master: match function for finding components
253 * @extra_size: Extra bytes to allocate
255 * This function is supposed to be used only by a HD-audio controller
256 * driver that needs the interaction with graphics driver.
258 * This function initializes and sets up the audio component to communicate
259 * with graphics driver.
261 * Unlike snd_hdac_i915_init(), this function doesn't synchronize with the
262 * binding with the DRM component. Each caller needs to sync via master_bind
265 * Returns zero for success or a negative error code.
267 int snd_hdac_acomp_init(struct hdac_bus *bus,
268 const struct drm_audio_component_audio_ops *aops,
269 int (*match_master)(struct device *, void *),
272 struct component_match *match = NULL;
273 struct device *dev = bus->dev;
274 struct drm_audio_component *acomp;
277 if (WARN_ON(hdac_get_acomp(dev)))
280 acomp = devres_alloc(hdac_acomp_release, sizeof(*acomp) + extra_size,
284 acomp->audio_ops = aops;
285 bus->audio_component = acomp;
286 devres_add(dev, acomp);
288 component_match_add(dev, &match, match_master, bus);
289 ret = component_master_add_with_match(dev, &hdac_component_master_ops,
297 bus->audio_component = NULL;
298 devres_destroy(dev, hdac_acomp_release, NULL, NULL);
299 dev_info(dev, "failed to add audio component master (%d)\n", ret);
303 EXPORT_SYMBOL_GPL(snd_hdac_acomp_init);
306 * snd_hdac_acomp_exit - Finalize audio component
309 * This function is supposed to be used only by a HD-audio controller
310 * driver that needs the interaction with graphics driver.
312 * This function releases the audio component that has been used.
314 * Returns zero for success or a negative error code.
316 int snd_hdac_acomp_exit(struct hdac_bus *bus)
318 struct device *dev = bus->dev;
319 struct drm_audio_component *acomp = bus->audio_component;
324 WARN_ON(bus->drm_power_refcount);
325 if (bus->drm_power_refcount > 0 && acomp->ops)
326 acomp->ops->put_power(acomp->dev);
328 component_master_del(dev, &hdac_component_master_ops);
330 bus->audio_component = NULL;
331 devres_destroy(dev, hdac_acomp_release, NULL, NULL);
335 EXPORT_SYMBOL_GPL(snd_hdac_acomp_exit);