[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>
#include <sound/hda_register.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);

#define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) || \
				((pci)->device == 0x0c0c) || \
				((pci)->device == 0x0d0c) || \
				((pci)->device == 0x160c))

/**
 * snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW
 * @bus: HDA core bus
 *
 * Intel HSW/BDW display HDA controller is in GPU. Both its power and link BCLK
 * depends on GPU. Two Extended Mode registers EM4 (M value) and EM5 (N Value)
 * are used to convert CDClk (Core Display Clock) to 24MHz BCLK:
 * BCLK = CDCLK * M / N
 * The values will be lost when the display power well is disabled and need to
 * be restored to avoid abnormal playback speed.
 *
 * Call this function at initializing and changing power well, as well as
 * at ELD notifier for the hotplug.
 */
void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
{
	struct i915_audio_component *acomp = bus->audio_component;
	struct pci_dev *pci = to_pci_dev(bus->dev);
	int cdclk_freq;
	unsigned int bclk_m, bclk_n;

	if (!acomp || !acomp->ops || !acomp->ops->get_cdclk_freq)
		return; /* only for i915 binding */
	if (!CONTROLLER_IN_GPU(pci))
		return; /* only HSW/BDW */

	cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);
	switch (cdclk_freq) {
	case 337500:
		bclk_m = 16;
		bclk_n = 225;
		break;

	case 450000:
	default: /* default CDCLK 450MHz */
		bclk_m = 4;
		bclk_n = 75;
		break;

	case 540000:
		bclk_m = 4;
		bclk_n = 90;
		break;

	case 675000:
		bclk_m = 8;
		bclk_n = 225;
		break;
	}

	snd_hdac_chip_writew(bus, HSW_EM4, bclk_m);
	snd_hdac_chip_writew(bus, HSW_EM5, bclk_n);
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);

/* 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);

/* check whether intel graphics is present */
static bool i915_gfx_present(void)
{
	static struct pci_device_id ids[] = {
		{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
		  .class = PCI_BASE_CLASS_DISPLAY << 16,
		  .class_mask = 0xff << 16 },
		{}
	};
	return pci_dev_present(ids);
}

/**
 * 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;

	if (!i915_gfx_present())
		return -ENODEV;

	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>
bb03ed21	23	#include <sound/hda_register.h>
98d8fc6c ML	24
	25	static struct i915_audio_component *hdac_acomp;
	26
78dd5e21 TI	27	/**
	28	* snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup
	29	* @bus: HDA core bus
	30	* @enable: enable or disable the wakeup
	31	*
	32	* This function is supposed to be used only by a HD-audio controller
	33	* driver that needs the interaction with i915 graphics.
	34	*
	35	* This function should be called during the chip reset, also called at
	36	* resume for updating STATESTS register read.
	37	*
	38	* Returns zero for success or a negative error code.
	39	*/
98d8fc6c ML	40	int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
	41	{
	42	struct i915_audio_component *acomp = bus->audio_component;
	43
692af901	44	if (!acomp \|\| !acomp->ops)
98d8fc6c ML	45	return -ENODEV;
	46
	47	if (!acomp->ops->codec_wake_override) {
	48	dev_warn(bus->dev,
	49	"Invalid codec wake callback\n");
	50	return 0;
	51	}
	52
	53	dev_dbg(bus->dev, "%s codec wakeup\n",
	54	enable ? "enable" : "disable");
	55
	56	acomp->ops->codec_wake_override(acomp->dev, enable);
	57
	58	return 0;
	59	}
	60	EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
	61
78dd5e21 TI	62	/**
	63	* snd_hdac_display_power - Power up / down the power refcount
	64	* @bus: HDA core bus
	65	* @enable: power up or down
	66	*
	67	* This function is supposed to be used only by a HD-audio controller
	68	* driver that needs the interaction with i915 graphics.
	69	*
	70	* This function manages a refcount and calls the i915 get_power() and
	71	* put_power() ops accordingly, toggling the codec wakeup, too.
	72	*
	73	* Returns zero for success or a negative error code.
	74	*/
98d8fc6c ML	75	int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
	76	{
	77	struct i915_audio_component *acomp = bus->audio_component;
	78
692af901	79	if (!acomp \|\| !acomp->ops)
98d8fc6c ML	80	return -ENODEV;
	81
	82	dev_dbg(bus->dev, "display power %s\n",
	83	enable ? "enable" : "disable");
	84
	85	if (enable) {
033ea349	86	if (!bus->i915_power_refcount++) {
98d8fc6c	87	acomp->ops->get_power(acomp->dev);
033ea349 DH	88	snd_hdac_set_codec_wakeup(bus, true);
	89	snd_hdac_set_codec_wakeup(bus, false);
	90	}
98d8fc6c ML	91	} else {
	92	WARN_ON(!bus->i915_power_refcount);
	93	if (!--bus->i915_power_refcount)
	94	acomp->ops->put_power(acomp->dev);
	95	}
	96
	97	return 0;
	98	}
	99	EXPORT_SYMBOL_GPL(snd_hdac_display_power);
	100
bb03ed21 TI	101	#define CONTROLLER_IN_GPU(pci) (((pci)->device == 0x0a0c) \|\| \
	102	((pci)->device == 0x0c0c) \|\| \
	103	((pci)->device == 0x0d0c) \|\| \
	104	((pci)->device == 0x160c))
	105
78dd5e21	106	/**
bb03ed21	107	* snd_hdac_i915_set_bclk - Reprogram BCLK for HSW/BDW
78dd5e21 TI	108	* @bus: HDA core bus
78dd5e21 TI	109	*
bb03ed21 TI	110	* Intel HSW/BDW display HDA controller is in GPU. Both its power and link BCLK
	111	* depends on GPU. Two Extended Mode registers EM4 (M value) and EM5 (N Value)
	112	* are used to convert CDClk (Core Display Clock) to 24MHz BCLK:
	113	* BCLK = CDCLK * M / N
	114	* The values will be lost when the display power well is disabled and need to
	115	* be restored to avoid abnormal playback speed.
78dd5e21	116	*
bb03ed21 TI	117	* Call this function at initializing and changing power well, as well as
bb03ed21 TI	118	* at ELD notifier for the hotplug.
78dd5e21	119	*/
bb03ed21	120	void snd_hdac_i915_set_bclk(struct hdac_bus *bus)
98d8fc6c ML	121	{
98d8fc6c ML	122	struct i915_audio_component *acomp = bus->audio_component;
bb03ed21 TI	123	struct pci_dev *pci = to_pci_dev(bus->dev);
	124	int cdclk_freq;
	125	unsigned int bclk_m, bclk_n;
	126
	127	if (!acomp \|\| !acomp->ops \|\| !acomp->ops->get_cdclk_freq)
	128	return; /* only for i915 binding */
	129	if (!CONTROLLER_IN_GPU(pci))
	130	return; /* only HSW/BDW */
	131
	132	cdclk_freq = acomp->ops->get_cdclk_freq(acomp->dev);
	133	switch (cdclk_freq) {
	134	case 337500:
	135	bclk_m = 16;
	136	bclk_n = 225;
	137	break;
	138
	139	case 450000:
	140	default: /* default CDCLK 450MHz */
	141	bclk_m = 4;
	142	bclk_n = 75;
	143	break;
	144
	145	case 540000:
	146	bclk_m = 4;
	147	bclk_n = 90;
	148	break;
	149
	150	case 675000:
	151	bclk_m = 8;
	152	bclk_n = 225;
	153	break;
	154	}
98d8fc6c	155
bb03ed21 TI	156	snd_hdac_chip_writew(bus, HSW_EM4, bclk_m);
bb03ed21 TI	157	snd_hdac_chip_writew(bus, HSW_EM5, bclk_n);
98d8fc6c	158	}
bb03ed21	159	EXPORT_SYMBOL_GPL(snd_hdac_i915_set_bclk);
98d8fc6c	160
e2dc7d7d TI	161	/* There is a fixed mapping between audio pin node and display port
	162	* on current Intel platforms:
	163	* Pin Widget 5 - PORT B (port = 1 in i915 driver)
	164	* Pin Widget 6 - PORT C (port = 2 in i915 driver)
	165	* Pin Widget 7 - PORT D (port = 3 in i915 driver)
	166	*/
	167	static int pin2port(hda_nid_t pin_nid)
	168	{
1a414f48 TI	169	if (WARN_ON(pin_nid < 5 \|\| pin_nid > 7))
1a414f48 TI	170	return -1;
e2dc7d7d TI	171	return pin_nid - 4;
	172	}
	173
	174	/**
	175	* snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate
	176	* @bus: HDA core bus
	177	* @nid: the pin widget NID
	178	* @rate: the sample rate to set
	179	*
	180	* This function is supposed to be used only by a HD-audio controller
	181	* driver that needs the interaction with i915 graphics.
	182	*
	183	* This function sets N/CTS value based on the given sample rate.
	184	* Returns zero for success, or a negative error code.
	185	*/
	186	int snd_hdac_sync_audio_rate(struct hdac_bus *bus, hda_nid_t nid, int rate)
	187	{
	188	struct i915_audio_component *acomp = bus->audio_component;
1a414f48	189	int port;
e2dc7d7d TI	190
	191	if (!acomp \|\| !acomp->ops \|\| !acomp->ops->sync_audio_rate)
	192	return -ENODEV;
1a414f48 TI	193	port = pin2port(nid);
	194	if (port < 0)
	195	return -EINVAL;
	196	return acomp->ops->sync_audio_rate(acomp->dev, port, rate);
e2dc7d7d TI	197	}
	198	EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
	199
	200	/**
	201	* snd_hdac_acomp_get_eld - Get the audio state and ELD via component
	202	* @bus: HDA core bus
	203	* @nid: the pin widget NID
	204	* @audio_enabled: the pointer to store the current audio state
	205	* @buffer: the buffer pointer to store ELD bytes
	206	* @max_bytes: the max bytes to be stored on @buffer
	207	*
	208	* This function is supposed to be used only by a HD-audio controller
	209	* driver that needs the interaction with i915 graphics.
	210	*
	211	* This function queries the current state of the audio on the given
	212	* digital port and fetches the ELD bytes onto the given buffer.
	213	* It returns the number of bytes for the total ELD data, zero for
	214	* invalid ELD, or a negative error code.
	215	*
	216	* The return size is the total bytes required for the whole ELD bytes,
	217	* thus it may be over @max_bytes. If it's over @max_bytes, it implies
	218	* that only a part of ELD bytes have been fetched.
	219	*/
	220	int snd_hdac_acomp_get_eld(struct hdac_bus *bus, hda_nid_t nid,
	221	bool audio_enabled, char buffer, int max_bytes)
	222	{
	223	struct i915_audio_component *acomp = bus->audio_component;
1a414f48	224	int port;
e2dc7d7d TI	225
	226	if (!acomp \|\| !acomp->ops \|\| !acomp->ops->get_eld)
	227	return -ENODEV;
	228
1a414f48 TI	229	port = pin2port(nid);
	230	if (port < 0)
	231	return -EINVAL;
	232	return acomp->ops->get_eld(acomp->dev, port, audio_enabled,
e2dc7d7d TI	233	buffer, max_bytes);
	234	}
	235	EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
	236
98d8fc6c ML	237	static int hdac_component_master_bind(struct device *dev)
	238	{
	239	struct i915_audio_component *acomp = hdac_acomp;
	240	int ret;
	241
	242	ret = component_bind_all(dev, acomp);
	243	if (ret < 0)
	244	return ret;
	245
	246	if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
	247	acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
	248	ret = -EINVAL;
	249	goto out_unbind;
	250	}
	251
	252	/*
	253	* Atm, we don't support dynamic unbinding initiated by the child
	254	* component, so pin its containing module until we unbind.
	255	*/
	256	if (!try_module_get(acomp->ops->owner)) {
	257	ret = -ENODEV;
	258	goto out_unbind;
	259	}
	260
	261	return 0;
	262
	263	out_unbind:
	264	component_unbind_all(dev, acomp);
	265
	266	return ret;
	267	}
	268
	269	static void hdac_component_master_unbind(struct device *dev)
	270	{
	271	struct i915_audio_component *acomp = hdac_acomp;
	272
	273	module_put(acomp->ops->owner);
	274	component_unbind_all(dev, acomp);
	275	WARN_ON(acomp->ops \|\| acomp->dev);
	276	}
	277
	278	static const struct component_master_ops hdac_component_master_ops = {
	279	.bind = hdac_component_master_bind,
	280	.unbind = hdac_component_master_unbind,
	281	};
	282
	283	static int hdac_component_master_match(struct device dev, void data)
	284	{
	285	/* i915 is the only supported component */
	286	return !strcmp(dev->driver->name, "i915");
	287	}
	288
78dd5e21 TI	289	/**
	290	* snd_hdac_i915_register_notifier - Register i915 audio component ops
	291	* @aops: i915 audio component ops
	292	*
	293	* This function is supposed to be used only by a HD-audio controller
	294	* driver that needs the interaction with i915 graphics.
	295	*
	296	* This function sets the given ops to be called by the i915 graphics driver.
	297	*
	298	* Returns zero for success or a negative error code.
	299	*/
45c053df DH	300	int snd_hdac_i915_register_notifier(const struct i915_audio_component_audio_ops *aops)
	301	{
	302	if (WARN_ON(!hdac_acomp))
	303	return -ENODEV;
	304
	305	hdac_acomp->audio_ops = aops;
	306	return 0;
	307	}
	308	EXPORT_SYMBOL_GPL(snd_hdac_i915_register_notifier);
	309
bfa5fb14 TI	310	/* check whether intel graphics is present */
	311	static bool i915_gfx_present(void)
	312	{
	313	static struct pci_device_id ids[] = {
	314	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
	315	.class = PCI_BASE_CLASS_DISPLAY << 16,
	316	.class_mask = 0xff << 16 },
	317	{}
	318	};
	319	return pci_dev_present(ids);
	320	}
	321
78dd5e21 TI	322	/**
	323	* snd_hdac_i915_init - Initialize i915 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 i915 graphics.
	328	*
	329	* This function initializes and sets up the audio component to communicate
	330	* with i915 graphics driver.
	331	*
	332	* Returns zero for success or a negative error code.
	333	*/
98d8fc6c ML	334	int snd_hdac_i915_init(struct hdac_bus *bus)
	335	{
	336	struct component_match *match = NULL;
	337	struct device *dev = bus->dev;
	338	struct i915_audio_component *acomp;
	339	int ret;
	340
bfa5fb14 TI	341	if (!i915_gfx_present())
	342	return -ENODEV;
	343
98d8fc6c ML	344	acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
	345	if (!acomp)
	346	return -ENOMEM;
	347	bus->audio_component = acomp;
	348	hdac_acomp = acomp;
	349
	350	component_match_add(dev, &match, hdac_component_master_match, bus);
	351	ret = component_master_add_with_match(dev, &hdac_component_master_ops,
	352	match);
	353	if (ret < 0)
	354	goto out_err;
	355
	356	/*
	357	* Atm, we don't support deferring the component binding, so make sure
	358	* i915 is loaded and that the binding successfully completes.
	359	*/
	360	request_module("i915");
	361
	362	if (!acomp->ops) {
	363	ret = -ENODEV;
	364	goto out_master_del;
	365	}
	366	dev_dbg(dev, "bound to i915 component master\n");
	367
	368	return 0;
	369	out_master_del:
	370	component_master_del(dev, &hdac_component_master_ops);
	371	out_err:
	372	kfree(acomp);
	373	bus->audio_component = NULL;
bed2e98e	374	dev_info(dev, "failed to add i915 component master (%d)\n", ret);
98d8fc6c ML	375
	376	return ret;
	377	}
	378	EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
	379
78dd5e21 TI	380	/**
	381	* snd_hdac_i915_exit - Finalize i915 audio component
	382	* @bus: HDA core bus
	383	*
	384	* This function is supposed to be used only by a HD-audio controller
	385	* driver that needs the interaction with i915 graphics.
	386	*
	387	* This function releases the i915 audio component that has been used.
	388	*
	389	* Returns zero for success or a negative error code.
	390	*/
98d8fc6c ML	391	int snd_hdac_i915_exit(struct hdac_bus *bus)
	392	{
	393	struct device *dev = bus->dev;
	394	struct i915_audio_component *acomp = bus->audio_component;
	395
692af901 TI	396	if (!acomp)
	397	return 0;
	398
98d8fc6c	399	WARN_ON(bus->i915_power_refcount);
692af901	400	if (bus->i915_power_refcount > 0 && acomp->ops)
98d8fc6c ML	401	acomp->ops->put_power(acomp->dev);
	402
	403	component_master_del(dev, &hdac_component_master_ops);
	404
	405	kfree(acomp);
	406	bus->audio_component = NULL;
	407
	408	return 0;
	409	}
	410	EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);