summaryrefslogtreecommitdiffstats
path: root/sound/hda/hdac_component.c
blob: a6d37b9d6413f51b49fd4486a251bf7e84261532 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
// SPDX-License-Identifier: GPL-2.0
// hdac_component.c - routines for sync between HD-A core and DRM driver

#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/component.h>
#include <sound/core.h>
#include <sound/hdaudio.h>
#include <sound/hda_component.h>
#include <sound/hda_register.h>

static void hdac_acomp_release(struct device *dev, void *res)
{
}

static struct drm_audio_component *hdac_get_acomp(struct device *dev)
{
	return devres_find(dev, hdac_acomp_release, NULL, NULL);
}

/**
 * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
 * @bus: HDA core bus
 * @enable: enable or disable the wakeup
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with graphics driver.
 *
 * This function should be called during the chip reset, also called at
 * resume for updating STATESTS register read.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
{
	struct drm_audio_component *acomp = bus->audio_component;

	if (!acomp || !acomp->ops)
		return -ENODEV;

	if (!acomp->ops->codec_wake_override)
		return 0;

	dev_dbg(bus->dev, "%s codec wakeup\n",
		enable ? "enable" : "disable");

	acomp->ops->codec_wake_override(acomp->dev, enable);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);

/**
 * snd_hdac_display_power - Power up / down the power refcount
 * @bus: HDA core bus
 * @idx: HDA codec address, pass HDA_CODEC_IDX_CONTROLLER for controller
 * @enable: power up or down
 *
 * This function is used by either HD-audio controller or codec driver that
 * needs the interaction with graphics driver.
 *
 * This function updates the power status, and calls the get_power() and
 * put_power() ops accordingly, toggling the codec wakeup, too.
 */
void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, bool enable)
{
	struct drm_audio_component *acomp = bus->audio_component;

	dev_dbg(bus->dev, "display power %s\n",
		enable ? "enable" : "disable");
	if (enable)
		set_bit(idx, &bus->display_power_status);
	else
		clear_bit(idx, &bus->display_power_status);

	if (!acomp || !acomp->ops)
		return;

	if (bus->display_power_status) {
		if (!bus->display_power_active) {
			if (acomp->ops->get_power)
				acomp->ops->get_power(acomp->dev);
			snd_hdac_set_codec_wakeup(bus, true);
			snd_hdac_set_codec_wakeup(bus, false);
			bus->display_power_active = true;
		}
	} else {
		if (bus->display_power_active) {
			if (acomp->ops->put_power)
				acomp->ops->put_power(acomp->dev);
			bus->display_power_active = false;
		}
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_display_power);

/**
 * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
 * @codec: HDA codec
 * @nid: the pin widget NID
 * @dev_id: device identifier
 * @rate: the sample rate to set
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with graphics driver.
 *
 * This function sets N/CTS value based on the given sample rate.
 * Returns zero for success, or a negative error code.
 */
int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid,
			     int dev_id, int rate)
{
	struct hdac_bus *bus = codec->bus;
	struct drm_audio_component *acomp = bus->audio_component;
	int port, pipe;

	if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate)
		return -ENODEV;
	port = nid;
	if (acomp->audio_ops && acomp->audio_ops->pin2port) {
		port = acomp->audio_ops->pin2port(codec, nid);
		if (port < 0)
			return -EINVAL;
	}
	pipe = dev_id;
	return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate);
}
EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);

/**
 * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
 * @codec: HDA codec
 * @nid: the pin widget NID
 * @dev_id: device identifier
 * @audio_enabled: the pointer to store the current audio state
 * @buffer: the buffer pointer to store ELD bytes
 * @max_bytes: the max bytes to be stored on @buffer
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with graphics driver.
 *
 * This function queries the current state of the audio on the given
 * digital port and fetches the ELD bytes onto the given buffer.
 * It returns the number of bytes for the total ELD data, zero for
 * invalid ELD, or a negative error code.
 *
 * The return size is the total bytes required for the whole ELD bytes,
 * thus it may be over @max_bytes.  If it's over @max_bytes, it implies
 * that only a part of ELD bytes have been fetched.
 */
int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id,
			   bool *audio_enabled, char *buffer, int max_bytes)
{
	struct hdac_bus *bus = codec->bus;
	struct drm_audio_component *acomp = bus->audio_component;
	int port, pipe;

	if (!acomp || !acomp->ops || !acomp->ops->get_eld)
		return -ENODEV;

	port = nid;
	if (acomp->audio_ops && acomp->audio_ops->pin2port) {
		port = acomp->audio_ops->pin2port(codec, nid);
		if (port < 0)
			return -EINVAL;
	}
	pipe = dev_id;
	return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled,
				   buffer, max_bytes);
}
EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);

static int hdac_component_master_bind(struct device *dev)
{
	struct drm_audio_component *acomp = hdac_get_acomp(dev);
	int ret;

	if (WARN_ON(!acomp))
		return -EINVAL;

	ret = component_bind_all(dev, acomp);
	if (ret < 0)
		return ret;

	if (WARN_ON(!(acomp->dev && acomp->ops))) {
		ret = -EINVAL;
		goto out_unbind;
	}

	/* pin the module to avoid dynamic unbinding, but only if given */
	if (!try_module_get(acomp->ops->owner)) {
		ret = -ENODEV;
		goto out_unbind;
	}

	if (acomp->audio_ops && acomp->audio_ops->master_bind) {
		ret = acomp->audio_ops->master_bind(dev, acomp);
		if (ret < 0)
			goto module_put;
	}

	return 0;

 module_put:
	module_put(acomp->ops->owner);
out_unbind:
	component_unbind_all(dev, acomp);

	return ret;
}

static void hdac_component_master_unbind(struct device *dev)
{
	struct drm_audio_component *acomp = hdac_get_acomp(dev);

	if (acomp->audio_ops && acomp->audio_ops->master_unbind)
		acomp->audio_ops->master_unbind(dev, acomp);
	module_put(acomp->ops->owner);
	component_unbind_all(dev, acomp);
	WARN_ON(acomp->ops || acomp->dev);
}

static const struct component_master_ops hdac_component_master_ops = {
	.bind = hdac_component_master_bind,
	.unbind = hdac_component_master_unbind,
};

/**
 * snd_hdac_acomp_register_notifier - Register audio component ops
 * @bus: HDA core bus
 * @aops: audio component ops
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with graphics driver.
 *
 * This function sets the given ops to be called by the graphics driver.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_acomp_register_notifier(struct hdac_bus *bus,
				    const struct drm_audio_component_audio_ops *aops)
{
	if (!bus->audio_component)
		return -ENODEV;

	bus->audio_component->audio_ops = aops;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier);

/**
 * snd_hdac_acomp_init - Initialize audio component
 * @bus: HDA core bus
 * @match_master: match function for finding components
 * @extra_size: Extra bytes to allocate
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with graphics driver.
 *
 * This function initializes and sets up the audio component to communicate
 * with graphics driver.
 *
 * Unlike snd_hdac_i915_init(), this function doesn't synchronize with the
 * binding with the DRM component.  Each caller needs to sync via master_bind
 * audio_ops.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_acomp_init(struct hdac_bus *bus,
			const struct drm_audio_component_audio_ops *aops,
			int (*match_master)(struct device *, void *),
			size_t extra_size)
{
	struct component_match *match = NULL;
	struct device *dev = bus->dev;
	struct drm_audio_component *acomp;
	int ret;

	if (WARN_ON(hdac_get_acomp(dev)))
		return -EBUSY;

	acomp = devres_alloc(hdac_acomp_release, sizeof(*acomp) + extra_size,
			     GFP_KERNEL);
	if (!acomp)
		return -ENOMEM;
	acomp->audio_ops = aops;
	bus->audio_component = acomp;
	devres_add(dev, acomp);

	component_match_add(dev, &match, match_master, bus);
	ret = component_master_add_with_match(dev, &hdac_component_master_ops,
					      match);
	if (ret < 0)
		goto out_err;

	return 0;

out_err:
	bus->audio_component = NULL;
	devres_destroy(dev, hdac_acomp_release, NULL, NULL);
	dev_info(dev, "failed to add audio component master (%d)\n", ret);

	return ret;
}
EXPORT_SYMBOL_GPL(snd_hdac_acomp_init);

/**
 * snd_hdac_acomp_exit - Finalize audio component
 * @bus: HDA core bus
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with graphics driver.
 *
 * This function releases the audio component that has been used.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_acomp_exit(struct hdac_bus *bus)
{
	struct device *dev = bus->dev;
	struct drm_audio_component *acomp = bus->audio_component;

	if (!acomp)
		return 0;

	if (WARN_ON(bus->display_power_active) && acomp->ops)
		acomp->ops->put_power(acomp->dev);

	bus->display_power_active = false;
	bus->display_power_status = 0;

	component_master_del(dev, &hdac_component_master_ops);

	bus->audio_component = NULL;
	devres_destroy(dev, hdac_acomp_release, NULL, NULL);

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_acomp_exit);