[linux-2.6-block.git] / sound / hda / hdac_i915.c

/*
 *  hdac_i915.c - routines for sync between HD-A core and i915 display driver
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 *  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/component.h>
#include <drm/i915_component.h>
#include <sound/core.h>
#include <sound/hdaudio.h>
#include <sound/hda_i915.h>

static struct i915_audio_component *hdac_acomp;

/**
 * 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 i915 graphics.
 *
 * 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 i915_audio_component *acomp = bus->audio_component;

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

	if (!acomp->ops->codec_wake_override) {
		dev_warn(bus->dev,
			"Invalid codec wake callback\n");
		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
 * @enable: power up or down
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with i915 graphics.
 *
 * This function manages a refcount and calls the i915 get_power() and
 * put_power() ops accordingly, toggling the codec wakeup, too.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
{
	struct i915_audio_component *acomp = bus->audio_component;

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

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

	if (enable) {
		if (!bus->i915_power_refcount++) {
			acomp->ops->get_power(acomp->dev);
			snd_hdac_set_codec_wakeup(bus, true);
			snd_hdac_set_codec_wakeup(bus, false);
		}
	} else {
		WARN_ON(!bus->i915_power_refcount);
		if (!--bus->i915_power_refcount)
			acomp->ops->put_power(acomp->dev);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_display_power);

/**
 * snd_hdac_get_display_clk - Get CDCLK in kHz
 * @bus: HDA core bus
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with i915 graphics.
 *
 * This function queries CDCLK value in kHz from the graphics driver and
 * returns the value.  A negative code is returned in error.
 */
int snd_hdac_get_display_clk(struct hdac_bus *bus)
{
	struct i915_audio_component *acomp = bus->audio_component;

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

	return acomp->ops->get_cdclk_freq(acomp->dev);
}
EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk);

/* There is a fixed mapping between audio pin node and display port
 * on current Intel platforms:
 * Pin Widget 5 - PORT B (port = 1 in i915 driver)
 * Pin Widget 6 - PORT C (port = 2 in i915 driver)
 * Pin Widget 7 - PORT D (port = 3 in i915 driver)
 */
static int pin2port(hda_nid_t pin_nid)
{
	if (WARN_ON(pin_nid < 5 || pin_nid > 7))
		return -1;
	return pin_nid - 4;
}

/**
 * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
 * @bus: HDA core bus
 * @nid: the pin widget NID
 * @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 i915 graphics.
 *
 * 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_bus *bus, hda_nid_t nid, int rate)
{
	struct i915_audio_component *acomp = bus->audio_component;
	int port;

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

/**
 * snd_hdac_acomp_get_eld - Get the audio state and ELD via component
 * @bus: HDA core bus
 * @nid: the pin widget NID
 * @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 i915 graphics.
 *
 * 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_bus *bus, hda_nid_t nid,
			   bool *audio_enabled, char *buffer, int max_bytes)
{
	struct i915_audio_component *acomp = bus->audio_component;
	int port;

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

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

static int hdac_component_master_bind(struct device *dev)
{
	struct i915_audio_component *acomp = hdac_acomp;
	int ret;

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

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

	/*
	 * Atm, we don't support dynamic unbinding initiated by the child
	 * component, so pin its containing module until we unbind.
	 */
	if (!try_module_get(acomp->ops->owner)) {
		ret = -ENODEV;
		goto out_unbind;
	}

	return 0;

out_unbind:
	component_unbind_all(dev, acomp);

	return ret;
}

static void hdac_component_master_unbind(struct device *dev)
{
	struct i915_audio_component *acomp = hdac_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,
};

static int hdac_component_master_match(struct device *dev, void *data)
{
	/* i915 is the only supported component */
	return !strcmp(dev->driver->name, "i915");
}

/**
 * snd_hdac_i915_register_notifier - Register i915 audio component ops
 * @aops: i915 audio component ops
 *
 * This function is supposed to be used only by a HD-audio controller
 * driver that needs the interaction with i915 graphics.
 *
 * This function sets the given ops to be called by the i915 graphics driver.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
{
	if (WARN_ON(!hdac_acomp))
		return -ENODEV;

	hdac_acomp->audio_ops = aops;
	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);

/**
 * snd_hdac_i915_init - Initialize i915 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 i915 graphics.
 *
 * This function initializes and sets up the audio component to communicate
 * with i915 graphics driver.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_i915_init(struct hdac_bus *bus)
{
	struct component_match *match = NULL;
	struct device *dev = bus->dev;
	struct i915_audio_component *acomp;
	int ret;

	acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
	if (!acomp)
		return -ENOMEM;
	bus->audio_component = acomp;
	hdac_acomp = acomp;

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

	/*
	 * Atm, we don't support deferring the component binding, so make sure
	 * i915 is loaded and that the binding successfully completes.
	 */
	request_module("i915");

	if (!acomp->ops) {
		ret = -ENODEV;
		goto out_master_del;
	}
	dev_dbg(dev, "bound to i915 component master\n");

	return 0;
out_master_del:
	component_master_del(dev, &hdac_component_master_ops);
out_err:
	kfree(acomp);
	bus->audio_component = NULL;
	dev_info(dev, "failed to add i915 component master (%d)\n", ret);

	return ret;
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_init);

/**
 * snd_hdac_i915_exit - Finalize i915 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 i915 graphics.
 *
 * This function releases the i915 audio component that has been used.
 *
 * Returns zero for success or a negative error code.
 */
int snd_hdac_i915_exit(struct hdac_bus *bus)
{
	struct device *dev = bus->dev;
	struct i915_audio_component *acomp = bus->audio_component;

	if (!acomp)
		return 0;

	WARN_ON(bus->i915_power_refcount);
	if (bus->i915_power_refcount > 0 && acomp->ops)
		acomp->ops->put_power(acomp->dev);

	component_master_del(dev, &hdac_component_master_ops);

	kfree(acomp);
	bus->audio_component = NULL;

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);
Commit	Line	Data
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	{
1a414f48 TI	129	if (WARN_ON(pin_nid < 5 \|\| pin_nid > 7))
1a414f48 TI	130	return -1;
e2dc7d7d TI	131	return pin_nid - 4;
	132	}
	133
	134	/**
	135	* snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
	136	* @bus: HDA core bus
	137	* @nid: the pin widget NID
	138	* @rate: the sample rate to set
	139	*
	140	* This function is supposed to be used only by a HD-audio controller
	141	* driver that needs the interaction with i915 graphics.
	142	*
	143	* This function sets N/CTS value based on the given sample rate.
	144	* Returns zero for success, or a negative error code.
	145	*/
	146	int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate)
	147	{
	148	struct i915_audio_component *acomp = bus->audio_component;
1a414f48	149	int port;
e2dc7d7d TI	150
	151	if (!acomp \|\| !acomp->ops \|\| !acomp->ops->sync_audio_rate)
	152	return -ENODEV;
1a414f48 TI	153	port = pin2port(nid);
	154	if (port < 0)
	155	return -EINVAL;
	156	return acomp->ops->sync_audio_rate(acomp->dev, port, rate);
e2dc7d7d TI	157	}
	158	EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
	159
	160	/**
	161	* snd_hdac_acomp_get_eld - Get the audio state and ELD via component
	162	* @bus: HDA core bus
	163	* @nid: the pin widget NID
	164	* @audio_enabled: the pointer to store the current audio state
	165	* @buffer: the buffer pointer to store ELD bytes
	166	* @max_bytes: the max bytes to be stored on @buffer
	167	*
	168	* This function is supposed to be used only by a HD-audio controller
	169	* driver that needs the interaction with i915 graphics.
	170	*
	171	* This function queries the current state of the audio on the given
	172	* digital port and fetches the ELD bytes onto the given buffer.
	173	* It returns the number of bytes for the total ELD data, zero for
	174	* invalid ELD, or a negative error code.
	175	*
	176	* The return size is the total bytes required for the whole ELD bytes,
	177	* thus it may be over @max_bytes. If it's over @max_bytes, it implies
	178	* that only a part of ELD bytes have been fetched.
	179	*/
	180	int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid,
	181	bool audio_enabled, char buffer, int max_bytes)
	182	{
	183	struct i915_audio_component *acomp = bus->audio_component;
1a414f48	184	int port;
e2dc7d7d TI	185
	186	if (!acomp \|\| !acomp->ops \|\| !acomp->ops->get_eld)
	187	return -ENODEV;
	188
1a414f48 TI	189	port = pin2port(nid);
	190	if (port < 0)
	191	return -EINVAL;
	192	return acomp->ops->get_eld(acomp->dev, port, audio_enabled,
e2dc7d7d TI	193	buffer, max_bytes);
	194	}
	195	EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
	196
98d8fc6c ML	197	static int hdac_component_master_bind(struct device *dev)
	198	{
	199	struct i915_audio_component *acomp = hdac_acomp;
	200	int ret;
	201
	202	ret = component_bind_all(dev, acomp);
	203	if (ret < 0)
	204	return ret;
	205
	206	if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
	207	acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
	208	ret = -EINVAL;
	209	goto out_unbind;
	210	}
	211
	212	/*
	213	* Atm, we don't support dynamic unbinding initiated by the child
	214	* component, so pin its containing module until we unbind.
	215	*/
	216	if (!try_module_get(acomp->ops->owner)) {
	217	ret = -ENODEV;
	218	goto out_unbind;
	219	}
	220
	221	return 0;
	222
	223	out_unbind:
	224	component_unbind_all(dev, acomp);
	225
	226	return ret;
	227	}
	228
	229	static void hdac_component_master_unbind(struct device *dev)
	230	{
	231	struct i915_audio_component *acomp = hdac_acomp;
	232
	233	module_put(acomp->ops->owner);
	234	component_unbind_all(dev, acomp);
	235	WARN_ON(acomp->ops \|\| acomp->dev);
	236	}
	237
	238	static const struct component_master_ops hdac_component_master_ops = {
	239	.bind = hdac_component_master_bind,
	240	.unbind = hdac_component_master_unbind,
	241	};
	242
	243	static int hdac_component_master_match(struct device dev, void data)
	244	{
	245	/* i915 is the only supported component */
	246	return !strcmp(dev->driver->name, "i915");
	247	}
	248
78dd5e21 TI	249	/**
	250	* snd_hdac_i915_register_notifier - Register i915 audio component ops
	251	* @aops: i915 audio component ops
	252	*
	253	* This function is supposed to be used only by a HD-audio controller
	254	* driver that needs the interaction with i915 graphics.
	255	*
	256	* This function sets the given ops to be called by the i915 graphics driver.
	257	*
	258	* Returns zero for success or a negative error code.
	259	*/
45c053df DH	260	int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
	261	{
	262	if (WARN_ON(!hdac_acomp))
	263	return -ENODEV;
	264
	265	hdac_acomp->audio_ops = aops;
	266	return 0;
	267	}
	268	EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
	269
78dd5e21 TI	270	/**
	271	* snd_hdac_i915_init - Initialize i915 audio component
	272	* @bus: HDA core bus
	273	*
	274	* This function is supposed to be used only by a HD-audio controller
	275	* driver that needs the interaction with i915 graphics.
	276	*
	277	* This function initializes and sets up the audio component to communicate
	278	* with i915 graphics driver.
	279	*
	280	* Returns zero for success or a negative error code.
	281	*/
98d8fc6c ML	282	int snd_hdac_i915_init(struct hdac_bus *bus)
	283	{
	284	struct component_match *match = NULL;
	285	struct device *dev = bus->dev;
	286	struct i915_audio_component *acomp;
	287	int ret;
	288
	289	acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
	290	if (!acomp)
	291	return -ENOMEM;
	292	bus->audio_component = acomp;
	293	hdac_acomp = acomp;
	294
	295	component_match_add(dev, &match, hdac_component_master_match, bus);
	296	ret = component_master_add_with_match(dev, &hdac_component_master_ops,
	297	match);
	298	if (ret < 0)
	299	goto out_err;
	300
	301	/*
	302	* Atm, we don't support deferring the component binding, so make sure
	303	* i915 is loaded and that the binding successfully completes.
	304	*/
	305	request_module("i915");
	306
	307	if (!acomp->ops) {
	308	ret = -ENODEV;
	309	goto out_master_del;
	310	}
	311	dev_dbg(dev, "bound to i915 component master\n");
	312
	313	return 0;
	314	out_master_del:
	315	component_master_del(dev, &hdac_component_master_ops);
	316	out_err:
	317	kfree(acomp);
	318	bus->audio_component = NULL;
bed2e98e	319	dev_info(dev, "failed to add i915 component master (%d)\n", ret);
98d8fc6c ML	320
	321	return ret;
	322	}
	323	EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
	324
78dd5e21 TI	325	/**
	326	* snd_hdac_i915_exit - Finalize i915 audio component
	327	* @bus: HDA core bus
	328	*
	329	* This function is supposed to be used only by a HD-audio controller
	330	* driver that needs the interaction with i915 graphics.
	331	*
	332	* This function releases the i915 audio component that has been used.
	333	*
	334	* Returns zero for success or a negative error code.
	335	*/
98d8fc6c ML	336	int snd_hdac_i915_exit(struct hdac_bus *bus)
	337	{
	338	struct device *dev = bus->dev;
	339	struct i915_audio_component *acomp = bus->audio_component;
	340
692af901 TI	341	if (!acomp)
	342	return 0;
	343
98d8fc6c	344	WARN_ON(bus->i915_power_refcount);
692af901	345	if (bus->i915_power_refcount > 0 && acomp->ops)
98d8fc6c ML	346	acomp->ops->put_power(acomp->dev);
	347
	348	component_master_del(dev, &hdac_component_master_ops);
	349
	350	kfree(acomp);
	351	bus->audio_component = NULL;
	352
	353	return 0;
	354	}
	355	EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);