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Commit | Line | Data |
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98d8fc6c ML |
1 | /* |
2 | * hdac_i915.c - routines for sync between HD-A core and i915 display driver | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; either version 2 of the License, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 | * for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/pci.h> | |
18 | #include <linux/component.h> | |
19 | #include <drm/i915_component.h> | |
20 | #include <sound/core.h> | |
21 | #include <sound/hdaudio.h> | |
22 | #include <sound/hda_i915.h> | |
23 | ||
24 | static struct i915_audio_component *hdac_acomp; | |
25 | ||
78dd5e21 TI |
26 | /** |
27 | * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup | |
28 | * @bus: HDA core bus | |
29 | * @enable: enable or disable the wakeup | |
30 | * | |
31 | * This function is supposed to be used only by a HD-audio controller | |
32 | * driver that needs the interaction with i915 graphics. | |
33 | * | |
34 | * This function should be called during the chip reset, also called at | |
35 | * resume for updating STATESTS register read. | |
36 | * | |
37 | * Returns zero for success or a negative error code. | |
38 | */ | |
98d8fc6c ML |
39 | int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable) |
40 | { | |
41 | struct i915_audio_component *acomp = bus->audio_component; | |
42 | ||
692af901 | 43 | if (!acomp || !acomp->ops) |
98d8fc6c ML |
44 | return -ENODEV; |
45 | ||
46 | if (!acomp->ops->codec_wake_override) { | |
47 | dev_warn(bus->dev, | |
48 | "Invalid codec wake callback\n"); | |
49 | return 0; | |
50 | } | |
51 | ||
52 | dev_dbg(bus->dev, "%s codec wakeup\n", | |
53 | enable ? "enable" : "disable"); | |
54 | ||
55 | acomp->ops->codec_wake_override(acomp->dev, enable); | |
56 | ||
57 | return 0; | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup); | |
60 | ||
78dd5e21 TI |
61 | /** |
62 | * snd_hdac_display_power - Power up / down the power refcount | |
63 | * @bus: HDA core bus | |
64 | * @enable: power up or down | |
65 | * | |
66 | * This function is supposed to be used only by a HD-audio controller | |
67 | * driver that needs the interaction with i915 graphics. | |
68 | * | |
69 | * This function manages a refcount and calls the i915 get_power() and | |
70 | * put_power() ops accordingly, toggling the codec wakeup, too. | |
71 | * | |
72 | * Returns zero for success or a negative error code. | |
73 | */ | |
98d8fc6c ML |
74 | int snd_hdac_display_power(struct hdac_bus *bus, bool enable) |
75 | { | |
76 | struct i915_audio_component *acomp = bus->audio_component; | |
77 | ||
692af901 | 78 | if (!acomp || !acomp->ops) |
98d8fc6c ML |
79 | return -ENODEV; |
80 | ||
81 | dev_dbg(bus->dev, "display power %s\n", | |
82 | enable ? "enable" : "disable"); | |
83 | ||
84 | if (enable) { | |
033ea349 | 85 | if (!bus->i915_power_refcount++) { |
98d8fc6c | 86 | acomp->ops->get_power(acomp->dev); |
033ea349 DH |
87 | snd_hdac_set_codec_wakeup(bus, true); |
88 | snd_hdac_set_codec_wakeup(bus, false); | |
89 | } | |
98d8fc6c ML |
90 | } else { |
91 | WARN_ON(!bus->i915_power_refcount); | |
92 | if (!--bus->i915_power_refcount) | |
93 | acomp->ops->put_power(acomp->dev); | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(snd_hdac_display_power); | |
99 | ||
78dd5e21 TI |
100 | /** |
101 | * snd_hdac_get_display_clk - Get CDCLK in kHz | |
102 | * @bus: HDA core bus | |
103 | * | |
104 | * This function is supposed to be used only by a HD-audio controller | |
105 | * driver that needs the interaction with i915 graphics. | |
106 | * | |
107 | * This function queries CDCLK value in kHz from the graphics driver and | |
108 | * returns the value. A negative code is returned in error. | |
109 | */ | |
98d8fc6c ML |
110 | int snd_hdac_get_display_clk(struct hdac_bus *bus) |
111 | { | |
112 | struct i915_audio_component *acomp = bus->audio_component; | |
113 | ||
692af901 | 114 | if (!acomp || !acomp->ops) |
98d8fc6c ML |
115 | return -ENODEV; |
116 | ||
117 | return acomp->ops->get_cdclk_freq(acomp->dev); | |
118 | } | |
119 | EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk); | |
120 | ||
e2dc7d7d TI |
121 | /* There is a fixed mapping between audio pin node and display port |
122 | * on current Intel platforms: | |
123 | * Pin Widget 5 - PORT B (port = 1 in i915 driver) | |
124 | * Pin Widget 6 - PORT C (port = 2 in i915 driver) | |
125 | * Pin Widget 7 - PORT D (port = 3 in i915 driver) | |
126 | */ | |
127 | static int pin2port(hda_nid_t pin_nid) | |
128 | { | |
129 | return pin_nid - 4; | |
130 | } | |
131 | ||
132 | /** | |
133 | * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate | |
134 | * @bus: HDA core bus | |
135 | * @nid: the pin widget NID | |
136 | * @rate: the sample rate to set | |
137 | * | |
138 | * This function is supposed to be used only by a HD-audio controller | |
139 | * driver that needs the interaction with i915 graphics. | |
140 | * | |
141 | * This function sets N/CTS value based on the given sample rate. | |
142 | * Returns zero for success, or a negative error code. | |
143 | */ | |
144 | int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate) | |
145 | { | |
146 | struct i915_audio_component *acomp = bus->audio_component; | |
147 | ||
148 | if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate) | |
149 | return -ENODEV; | |
150 | return acomp->ops->sync_audio_rate(acomp->dev, pin2port(nid), rate); | |
151 | } | |
152 | EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate); | |
153 | ||
154 | /** | |
155 | * snd_hdac_acomp_get_eld - Get the audio state and ELD via component | |
156 | * @bus: HDA core bus | |
157 | * @nid: the pin widget NID | |
158 | * @audio_enabled: the pointer to store the current audio state | |
159 | * @buffer: the buffer pointer to store ELD bytes | |
160 | * @max_bytes: the max bytes to be stored on @buffer | |
161 | * | |
162 | * This function is supposed to be used only by a HD-audio controller | |
163 | * driver that needs the interaction with i915 graphics. | |
164 | * | |
165 | * This function queries the current state of the audio on the given | |
166 | * digital port and fetches the ELD bytes onto the given buffer. | |
167 | * It returns the number of bytes for the total ELD data, zero for | |
168 | * invalid ELD, or a negative error code. | |
169 | * | |
170 | * The return size is the total bytes required for the whole ELD bytes, | |
171 | * thus it may be over @max_bytes. If it's over @max_bytes, it implies | |
172 | * that only a part of ELD bytes have been fetched. | |
173 | */ | |
174 | int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid, | |
175 | bool *audio_enabled, char *buffer, int max_bytes) | |
176 | { | |
177 | struct i915_audio_component *acomp = bus->audio_component; | |
178 | ||
179 | if (!acomp || !acomp->ops || !acomp->ops->get_eld) | |
180 | return -ENODEV; | |
181 | ||
182 | return acomp->ops->get_eld(acomp->dev, pin2port(nid), audio_enabled, | |
183 | buffer, max_bytes); | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld); | |
186 | ||
98d8fc6c ML |
187 | static int hdac_component_master_bind(struct device *dev) |
188 | { | |
189 | struct i915_audio_component *acomp = hdac_acomp; | |
190 | int ret; | |
191 | ||
192 | ret = component_bind_all(dev, acomp); | |
193 | if (ret < 0) | |
194 | return ret; | |
195 | ||
196 | if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power && | |
197 | acomp->ops->put_power && acomp->ops->get_cdclk_freq))) { | |
198 | ret = -EINVAL; | |
199 | goto out_unbind; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Atm, we don't support dynamic unbinding initiated by the child | |
204 | * component, so pin its containing module until we unbind. | |
205 | */ | |
206 | if (!try_module_get(acomp->ops->owner)) { | |
207 | ret = -ENODEV; | |
208 | goto out_unbind; | |
209 | } | |
210 | ||
211 | return 0; | |
212 | ||
213 | out_unbind: | |
214 | component_unbind_all(dev, acomp); | |
215 | ||
216 | return ret; | |
217 | } | |
218 | ||
219 | static void hdac_component_master_unbind(struct device *dev) | |
220 | { | |
221 | struct i915_audio_component *acomp = hdac_acomp; | |
222 | ||
223 | module_put(acomp->ops->owner); | |
224 | component_unbind_all(dev, acomp); | |
225 | WARN_ON(acomp->ops || acomp->dev); | |
226 | } | |
227 | ||
228 | static const struct component_master_ops hdac_component_master_ops = { | |
229 | .bind = hdac_component_master_bind, | |
230 | .unbind = hdac_component_master_unbind, | |
231 | }; | |
232 | ||
233 | static int hdac_component_master_match(struct device *dev, void *data) | |
234 | { | |
235 | /* i915 is the only supported component */ | |
236 | return !strcmp(dev->driver->name, "i915"); | |
237 | } | |
238 | ||
78dd5e21 TI |
239 | /** |
240 | * snd_hdac_i915_register_notifier - Register i915 audio component ops | |
241 | * @aops: i915 audio component ops | |
242 | * | |
243 | * This function is supposed to be used only by a HD-audio controller | |
244 | * driver that needs the interaction with i915 graphics. | |
245 | * | |
246 | * This function sets the given ops to be called by the i915 graphics driver. | |
247 | * | |
248 | * Returns zero for success or a negative error code. | |
249 | */ | |
45c053df DH |
250 | int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops) |
251 | { | |
252 | if (WARN_ON(!hdac_acomp)) | |
253 | return -ENODEV; | |
254 | ||
255 | hdac_acomp->audio_ops = aops; | |
256 | return 0; | |
257 | } | |
258 | EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier); | |
259 | ||
78dd5e21 TI |
260 | /** |
261 | * snd_hdac_i915_init - Initialize i915 audio component | |
262 | * @bus: HDA core bus | |
263 | * | |
264 | * This function is supposed to be used only by a HD-audio controller | |
265 | * driver that needs the interaction with i915 graphics. | |
266 | * | |
267 | * This function initializes and sets up the audio component to communicate | |
268 | * with i915 graphics driver. | |
269 | * | |
270 | * Returns zero for success or a negative error code. | |
271 | */ | |
98d8fc6c ML |
272 | int snd_hdac_i915_init(struct hdac_bus *bus) |
273 | { | |
274 | struct component_match *match = NULL; | |
275 | struct device *dev = bus->dev; | |
276 | struct i915_audio_component *acomp; | |
277 | int ret; | |
278 | ||
279 | acomp = kzalloc(sizeof(*acomp), GFP_KERNEL); | |
280 | if (!acomp) | |
281 | return -ENOMEM; | |
282 | bus->audio_component = acomp; | |
283 | hdac_acomp = acomp; | |
284 | ||
285 | component_match_add(dev, &match, hdac_component_master_match, bus); | |
286 | ret = component_master_add_with_match(dev, &hdac_component_master_ops, | |
287 | match); | |
288 | if (ret < 0) | |
289 | goto out_err; | |
290 | ||
291 | /* | |
292 | * Atm, we don't support deferring the component binding, so make sure | |
293 | * i915 is loaded and that the binding successfully completes. | |
294 | */ | |
295 | request_module("i915"); | |
296 | ||
297 | if (!acomp->ops) { | |
298 | ret = -ENODEV; | |
299 | goto out_master_del; | |
300 | } | |
301 | dev_dbg(dev, "bound to i915 component master\n"); | |
302 | ||
303 | return 0; | |
304 | out_master_del: | |
305 | component_master_del(dev, &hdac_component_master_ops); | |
306 | out_err: | |
307 | kfree(acomp); | |
308 | bus->audio_component = NULL; | |
bed2e98e | 309 | dev_info(dev, "failed to add i915 component master (%d)\n", ret); |
98d8fc6c ML |
310 | |
311 | return ret; | |
312 | } | |
313 | EXPORT_SYMBOL_GPL(snd_hdac_i915_init); | |
314 | ||
78dd5e21 TI |
315 | /** |
316 | * snd_hdac_i915_exit - Finalize i915 audio component | |
317 | * @bus: HDA core bus | |
318 | * | |
319 | * This function is supposed to be used only by a HD-audio controller | |
320 | * driver that needs the interaction with i915 graphics. | |
321 | * | |
322 | * This function releases the i915 audio component that has been used. | |
323 | * | |
324 | * Returns zero for success or a negative error code. | |
325 | */ | |
98d8fc6c ML |
326 | int snd_hdac_i915_exit(struct hdac_bus *bus) |
327 | { | |
328 | struct device *dev = bus->dev; | |
329 | struct i915_audio_component *acomp = bus->audio_component; | |
330 | ||
692af901 TI |
331 | if (!acomp) |
332 | return 0; | |
333 | ||
98d8fc6c | 334 | WARN_ON(bus->i915_power_refcount); |
692af901 | 335 | if (bus->i915_power_refcount > 0 && acomp->ops) |
98d8fc6c ML |
336 | acomp->ops->put_power(acomp->dev); |
337 | ||
338 | component_master_del(dev, &hdac_component_master_ops); | |
339 | ||
340 | kfree(acomp); | |
341 | bus->audio_component = NULL; | |
342 | ||
343 | return 0; | |
344 | } | |
345 | EXPORT_SYMBOL_GPL(snd_hdac_i915_exit); |