Commit | Line | Data |
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a57942bf TI |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // hdac_component.c - routines for sync between HD-A core and DRM driver | |
3 | ||
4 | #include <linux/init.h> | |
5 | #include <linux/module.h> | |
6 | #include <linux/pci.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> | |
12 | ||
13 | static void hdac_acomp_release(struct device *dev, void *res) | |
14 | { | |
15 | } | |
16 | ||
17 | static struct drm_audio_component *hdac_get_acomp(struct device *dev) | |
18 | { | |
19 | return devres_find(dev, hdac_acomp_release, NULL, NULL); | |
20 | } | |
21 | ||
22 | /** | |
23 | * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup | |
24 | * @bus: HDA core bus | |
25 | * @enable: enable or disable the wakeup | |
26 | * | |
27 | * This function is supposed to be used only by a HD-audio controller | |
28 | * driver that needs the interaction with graphics driver. | |
29 | * | |
30 | * This function should be called during the chip reset, also called at | |
31 | * resume for updating STATESTS register read. | |
32 | * | |
33 | * Returns zero for success or a negative error code. | |
34 | */ | |
35 | int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable) | |
36 | { | |
37 | struct drm_audio_component *acomp = bus->audio_component; | |
38 | ||
39 | if (!acomp || !acomp->ops) | |
40 | return -ENODEV; | |
41 | ||
42 | if (!acomp->ops->codec_wake_override) | |
43 | return 0; | |
44 | ||
45 | dev_dbg(bus->dev, "%s codec wakeup\n", | |
46 | enable ? "enable" : "disable"); | |
47 | ||
48 | acomp->ops->codec_wake_override(acomp->dev, enable); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup); | |
53 | ||
54 | /** | |
55 | * snd_hdac_display_power - Power up / down the power refcount | |
56 | * @bus: HDA core bus | |
029d92c2 | 57 | * @idx: HDA codec address, pass HDA_CODEC_IDX_CONTROLLER for controller |
a57942bf TI |
58 | * @enable: power up or down |
59 | * | |
029d92c2 TI |
60 | * This function is used by either HD-audio controller or codec driver that |
61 | * needs the interaction with graphics driver. | |
a57942bf | 62 | * |
029d92c2 | 63 | * This function updates the power status, and calls the get_power() and |
a57942bf | 64 | * put_power() ops accordingly, toggling the codec wakeup, too. |
a57942bf | 65 | */ |
4f799e73 | 66 | void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, bool enable) |
a57942bf TI |
67 | { |
68 | struct drm_audio_component *acomp = bus->audio_component; | |
69 | ||
a57942bf TI |
70 | dev_dbg(bus->dev, "display power %s\n", |
71 | enable ? "enable" : "disable"); | |
d7a181da TI |
72 | |
73 | mutex_lock(&bus->lock); | |
029d92c2 TI |
74 | if (enable) |
75 | set_bit(idx, &bus->display_power_status); | |
76 | else | |
77 | clear_bit(idx, &bus->display_power_status); | |
a57942bf | 78 | |
029d92c2 | 79 | if (!acomp || !acomp->ops) |
d7a181da | 80 | goto unlock; |
029d92c2 TI |
81 | |
82 | if (bus->display_power_status) { | |
83 | if (!bus->display_power_active) { | |
d31c85fc CW |
84 | unsigned long cookie = -1; |
85 | ||
a57942bf | 86 | if (acomp->ops->get_power) |
d31c85fc CW |
87 | cookie = acomp->ops->get_power(acomp->dev); |
88 | ||
a57942bf TI |
89 | snd_hdac_set_codec_wakeup(bus, true); |
90 | snd_hdac_set_codec_wakeup(bus, false); | |
d31c85fc | 91 | bus->display_power_active = cookie; |
a57942bf TI |
92 | } |
93 | } else { | |
029d92c2 | 94 | if (bus->display_power_active) { |
d31c85fc CW |
95 | unsigned long cookie = bus->display_power_active; |
96 | ||
a57942bf | 97 | if (acomp->ops->put_power) |
d31c85fc CW |
98 | acomp->ops->put_power(acomp->dev, cookie); |
99 | ||
100 | bus->display_power_active = 0; | |
029d92c2 | 101 | } |
a57942bf | 102 | } |
d7a181da TI |
103 | unlock: |
104 | mutex_unlock(&bus->lock); | |
a57942bf TI |
105 | } |
106 | EXPORT_SYMBOL_GPL(snd_hdac_display_power); | |
107 | ||
108 | /** | |
109 | * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate | |
110 | * @codec: HDA codec | |
111 | * @nid: the pin widget NID | |
112 | * @dev_id: device identifier | |
113 | * @rate: the sample rate to set | |
114 | * | |
115 | * This function is supposed to be used only by a HD-audio controller | |
116 | * driver that needs the interaction with graphics driver. | |
117 | * | |
118 | * This function sets N/CTS value based on the given sample rate. | |
119 | * Returns zero for success, or a negative error code. | |
120 | */ | |
121 | int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid, | |
122 | int dev_id, int rate) | |
123 | { | |
124 | struct hdac_bus *bus = codec->bus; | |
125 | struct drm_audio_component *acomp = bus->audio_component; | |
126 | int port, pipe; | |
127 | ||
128 | if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate) | |
129 | return -ENODEV; | |
130 | port = nid; | |
131 | if (acomp->audio_ops && acomp->audio_ops->pin2port) { | |
132 | port = acomp->audio_ops->pin2port(codec, nid); | |
133 | if (port < 0) | |
134 | return -EINVAL; | |
135 | } | |
136 | pipe = dev_id; | |
137 | return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate); | |
138 | } | |
139 | EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate); | |
140 | ||
141 | /** | |
142 | * snd_hdac_acomp_get_eld - Get the audio state and ELD via component | |
143 | * @codec: HDA codec | |
144 | * @nid: the pin widget NID | |
145 | * @dev_id: device identifier | |
146 | * @audio_enabled: the pointer to store the current audio state | |
147 | * @buffer: the buffer pointer to store ELD bytes | |
148 | * @max_bytes: the max bytes to be stored on @buffer | |
149 | * | |
150 | * This function is supposed to be used only by a HD-audio controller | |
151 | * driver that needs the interaction with graphics driver. | |
152 | * | |
153 | * This function queries the current state of the audio on the given | |
154 | * digital port and fetches the ELD bytes onto the given buffer. | |
155 | * It returns the number of bytes for the total ELD data, zero for | |
156 | * invalid ELD, or a negative error code. | |
157 | * | |
158 | * The return size is the total bytes required for the whole ELD bytes, | |
159 | * thus it may be over @max_bytes. If it's over @max_bytes, it implies | |
160 | * that only a part of ELD bytes have been fetched. | |
161 | */ | |
162 | int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id, | |
163 | bool *audio_enabled, char *buffer, int max_bytes) | |
164 | { | |
165 | struct hdac_bus *bus = codec->bus; | |
166 | struct drm_audio_component *acomp = bus->audio_component; | |
167 | int port, pipe; | |
168 | ||
169 | if (!acomp || !acomp->ops || !acomp->ops->get_eld) | |
170 | return -ENODEV; | |
171 | ||
172 | port = nid; | |
173 | if (acomp->audio_ops && acomp->audio_ops->pin2port) { | |
174 | port = acomp->audio_ops->pin2port(codec, nid); | |
175 | if (port < 0) | |
176 | return -EINVAL; | |
177 | } | |
178 | pipe = dev_id; | |
179 | return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled, | |
180 | buffer, max_bytes); | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld); | |
183 | ||
184 | static int hdac_component_master_bind(struct device *dev) | |
185 | { | |
186 | struct drm_audio_component *acomp = hdac_get_acomp(dev); | |
187 | int ret; | |
188 | ||
189 | if (WARN_ON(!acomp)) | |
190 | return -EINVAL; | |
191 | ||
192 | ret = component_bind_all(dev, acomp); | |
193 | if (ret < 0) | |
194 | return ret; | |
195 | ||
196 | if (WARN_ON(!(acomp->dev && acomp->ops))) { | |
197 | ret = -EINVAL; | |
198 | goto out_unbind; | |
199 | } | |
200 | ||
201 | /* pin the module to avoid dynamic unbinding, but only if given */ | |
202 | if (!try_module_get(acomp->ops->owner)) { | |
203 | ret = -ENODEV; | |
204 | goto out_unbind; | |
205 | } | |
206 | ||
207 | if (acomp->audio_ops && acomp->audio_ops->master_bind) { | |
208 | ret = acomp->audio_ops->master_bind(dev, acomp); | |
209 | if (ret < 0) | |
210 | goto module_put; | |
211 | } | |
212 | ||
96e503f9 | 213 | complete_all(&acomp->master_bind_complete); |
a57942bf TI |
214 | return 0; |
215 | ||
216 | module_put: | |
217 | module_put(acomp->ops->owner); | |
218 | out_unbind: | |
219 | component_unbind_all(dev, acomp); | |
96e503f9 | 220 | complete_all(&acomp->master_bind_complete); |
a57942bf TI |
221 | |
222 | return ret; | |
223 | } | |
224 | ||
225 | static void hdac_component_master_unbind(struct device *dev) | |
226 | { | |
227 | struct drm_audio_component *acomp = hdac_get_acomp(dev); | |
228 | ||
229 | if (acomp->audio_ops && acomp->audio_ops->master_unbind) | |
230 | acomp->audio_ops->master_unbind(dev, acomp); | |
231 | module_put(acomp->ops->owner); | |
232 | component_unbind_all(dev, acomp); | |
233 | WARN_ON(acomp->ops || acomp->dev); | |
234 | } | |
235 | ||
236 | static const struct component_master_ops hdac_component_master_ops = { | |
237 | .bind = hdac_component_master_bind, | |
238 | .unbind = hdac_component_master_unbind, | |
239 | }; | |
240 | ||
241 | /** | |
242 | * snd_hdac_acomp_register_notifier - Register audio component ops | |
243 | * @bus: HDA core bus | |
244 | * @aops: audio component ops | |
245 | * | |
246 | * This function is supposed to be used only by a HD-audio controller | |
247 | * driver that needs the interaction with graphics driver. | |
248 | * | |
249 | * This function sets the given ops to be called by the graphics driver. | |
250 | * | |
251 | * Returns zero for success or a negative error code. | |
252 | */ | |
253 | int snd_hdac_acomp_register_notifier(struct hdac_bus *bus, | |
254 | const struct drm_audio_component_audio_ops *aops) | |
255 | { | |
256 | if (!bus->audio_component) | |
257 | return -ENODEV; | |
258 | ||
259 | bus->audio_component->audio_ops = aops; | |
260 | return 0; | |
261 | } | |
262 | EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier); | |
263 | ||
264 | /** | |
265 | * snd_hdac_acomp_init - Initialize audio component | |
266 | * @bus: HDA core bus | |
6e57188f | 267 | * @aops: audio component ops |
a57942bf TI |
268 | * @match_master: match function for finding components |
269 | * @extra_size: Extra bytes to allocate | |
270 | * | |
271 | * This function is supposed to be used only by a HD-audio controller | |
272 | * driver that needs the interaction with graphics driver. | |
273 | * | |
274 | * This function initializes and sets up the audio component to communicate | |
275 | * with graphics driver. | |
276 | * | |
277 | * Unlike snd_hdac_i915_init(), this function doesn't synchronize with the | |
278 | * binding with the DRM component. Each caller needs to sync via master_bind | |
279 | * audio_ops. | |
280 | * | |
281 | * Returns zero for success or a negative error code. | |
282 | */ | |
283 | int snd_hdac_acomp_init(struct hdac_bus *bus, | |
284 | const struct drm_audio_component_audio_ops *aops, | |
8857c7d0 | 285 | int (*match_master)(struct device *, int, void *), |
a57942bf TI |
286 | size_t extra_size) |
287 | { | |
288 | struct component_match *match = NULL; | |
289 | struct device *dev = bus->dev; | |
290 | struct drm_audio_component *acomp; | |
291 | int ret; | |
292 | ||
293 | if (WARN_ON(hdac_get_acomp(dev))) | |
294 | return -EBUSY; | |
295 | ||
296 | acomp = devres_alloc(hdac_acomp_release, sizeof(*acomp) + extra_size, | |
297 | GFP_KERNEL); | |
298 | if (!acomp) | |
299 | return -ENOMEM; | |
300 | acomp->audio_ops = aops; | |
96e503f9 | 301 | init_completion(&acomp->master_bind_complete); |
a57942bf TI |
302 | bus->audio_component = acomp; |
303 | devres_add(dev, acomp); | |
304 | ||
8857c7d0 | 305 | component_match_add_typed(dev, &match, match_master, bus); |
a57942bf TI |
306 | ret = component_master_add_with_match(dev, &hdac_component_master_ops, |
307 | match); | |
308 | if (ret < 0) | |
309 | goto out_err; | |
310 | ||
311 | return 0; | |
312 | ||
313 | out_err: | |
314 | bus->audio_component = NULL; | |
315 | devres_destroy(dev, hdac_acomp_release, NULL, NULL); | |
316 | dev_info(dev, "failed to add audio component master (%d)\n", ret); | |
317 | ||
318 | return ret; | |
319 | } | |
320 | EXPORT_SYMBOL_GPL(snd_hdac_acomp_init); | |
321 | ||
322 | /** | |
323 | * snd_hdac_acomp_exit - Finalize audio component | |
324 | * @bus: HDA core bus | |
325 | * | |
326 | * This function is supposed to be used only by a HD-audio controller | |
327 | * driver that needs the interaction with graphics driver. | |
328 | * | |
329 | * This function releases the audio component that has been used. | |
330 | * | |
331 | * Returns zero for success or a negative error code. | |
332 | */ | |
333 | int snd_hdac_acomp_exit(struct hdac_bus *bus) | |
334 | { | |
335 | struct device *dev = bus->dev; | |
336 | struct drm_audio_component *acomp = bus->audio_component; | |
337 | ||
338 | if (!acomp) | |
339 | return 0; | |
340 | ||
029d92c2 | 341 | if (WARN_ON(bus->display_power_active) && acomp->ops) |
d31c85fc | 342 | acomp->ops->put_power(acomp->dev, bus->display_power_active); |
a57942bf | 343 | |
d31c85fc | 344 | bus->display_power_active = 0; |
029d92c2 TI |
345 | bus->display_power_status = 0; |
346 | ||
a57942bf TI |
347 | component_master_del(dev, &hdac_component_master_ops); |
348 | ||
349 | bus->audio_component = NULL; | |
350 | devres_destroy(dev, hdac_acomp_release, NULL, NULL); | |
351 | ||
352 | return 0; | |
353 | } | |
354 | EXPORT_SYMBOL_GPL(snd_hdac_acomp_exit); |