[deliverable/linux.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;

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);

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);

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);

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");
}

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_err(dev, "failed to add i915 component master (%d)\n", ret);

	return ret;
}
EXPORT_SYMBOL_GPL(snd_hdac_i915_init);

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
	26	int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
	27	{
	28	struct i915_audio_component *acomp = bus->audio_component;
	29
692af901	30	if (!acomp \|\| !acomp->ops)
98d8fc6c ML	31	return -ENODEV;
	32
	33	if (!acomp->ops->codec_wake_override) {
	34	dev_warn(bus->dev,
	35	"Invalid codec wake callback\n");
	36	return 0;
	37	}
	38
	39	dev_dbg(bus->dev, "%s codec wakeup\n",
	40	enable ? "enable" : "disable");
	41
	42	acomp->ops->codec_wake_override(acomp->dev, enable);
	43
	44	return 0;
	45	}
	46	EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
	47
	48	int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
	49	{
	50	struct i915_audio_component *acomp = bus->audio_component;
	51
692af901	52	if (!acomp \|\| !acomp->ops)
98d8fc6c ML	53	return -ENODEV;
	54
	55	dev_dbg(bus->dev, "display power %s\n",
	56	enable ? "enable" : "disable");
	57
	58	if (enable) {
033ea349	59	if (!bus->i915_power_refcount++) {
98d8fc6c	60	acomp->ops->get_power(acomp->dev);
033ea349 DH	61	snd_hdac_set_codec_wakeup(bus, true);
	62	snd_hdac_set_codec_wakeup(bus, false);
	63	}
98d8fc6c ML	64	} else {
	65	WARN_ON(!bus->i915_power_refcount);
	66	if (!--bus->i915_power_refcount)
	67	acomp->ops->put_power(acomp->dev);
	68	}
	69
	70	return 0;
	71	}
	72	EXPORT_SYMBOL_GPL(snd_hdac_display_power);
	73
	74	int snd_hdac_get_display_clk(struct hdac_bus *bus)
	75	{
	76	struct i915_audio_component *acomp = bus->audio_component;
	77
692af901	78	if (!acomp \|\| !acomp->ops)
98d8fc6c ML	79	return -ENODEV;
	80
	81	return acomp->ops->get_cdclk_freq(acomp->dev);
	82	}
	83	EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk);
	84
	85	static int hdac_component_master_bind(struct device *dev)
	86	{
	87	struct i915_audio_component *acomp = hdac_acomp;
	88	int ret;
	89
	90	ret = component_bind_all(dev, acomp);
	91	if (ret < 0)
	92	return ret;
	93
	94	if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
	95	acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
	96	ret = -EINVAL;
	97	goto out_unbind;
	98	}
	99
	100	/*
	101	* Atm, we don't support dynamic unbinding initiated by the child
	102	* component, so pin its containing module until we unbind.
	103	*/
	104	if (!try_module_get(acomp->ops->owner)) {
	105	ret = -ENODEV;
	106	goto out_unbind;
	107	}
	108
	109	return 0;
	110
	111	out_unbind:
	112	component_unbind_all(dev, acomp);
	113
	114	return ret;
	115	}
	116
	117	static void hdac_component_master_unbind(struct device *dev)
	118	{
	119	struct i915_audio_component *acomp = hdac_acomp;
	120
	121	module_put(acomp->ops->owner);
	122	component_unbind_all(dev, acomp);
	123	WARN_ON(acomp->ops \|\| acomp->dev);
	124	}
	125
	126	static const struct component_master_ops hdac_component_master_ops = {
	127	.bind = hdac_component_master_bind,
	128	.unbind = hdac_component_master_unbind,
	129	};
	130
	131	static int hdac_component_master_match(struct device dev, void data)
	132	{
	133	/* i915 is the only supported component */
	134	return !strcmp(dev->driver->name, "i915");
	135	}
	136
	137	int snd_hdac_i915_init(struct hdac_bus *bus)
	138	{
	139	struct component_match *match = NULL;
	140	struct device *dev = bus->dev;
	141	struct i915_audio_component *acomp;
	142	int ret;
143
144	acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
145	if (!acomp)
146	return -ENOMEM;
147	bus->audio_component = acomp;
148	hdac_acomp = acomp;
149
150	component_match_add(dev, &match, hdac_component_master_match, bus);
151	ret = component_master_add_with_match(dev, &hdac_component_master_ops,
152	match);
153	if (ret < 0)
154	goto out_err;
155
156	/*
157	* Atm, we don't support deferring the component binding, so make sure
158	* i915 is loaded and that the binding successfully completes.
159	*/
160	request_module("i915");
161
162	if (!acomp->ops) {
163	ret = -ENODEV;
164	goto out_master_del;
165	}
166	dev_dbg(dev, "bound to i915 component master\n");
167
168	return 0;
169	out_master_del:
170	component_master_del(dev, &hdac_component_master_ops);
171	out_err:
172	kfree(acomp);
173	bus->audio_component = NULL;
174	dev_err(dev, "failed to add i915 component master (%d)\n", ret);
175
176	return ret;
177	}
178	EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
179
180	int snd_hdac_i915_exit(struct hdac_bus *bus)
181	{
182	struct device *dev = bus->dev;
183	struct i915_audio_component *acomp = bus->audio_component;
184
692af901 TI	185	if (!acomp)
	186	return 0;
	187
98d8fc6c	188	WARN_ON(bus->i915_power_refcount);
692af901	189	if (bus->i915_power_refcount > 0 && acomp->ops)
98d8fc6c ML	190	acomp->ops->put_power(acomp->dev);
	191
	192	component_master_del(dev, &hdac_component_master_ops);
	193
	194	kfree(acomp);
	195	bus->audio_component = NULL;
	196
	197	return 0;
	198	}
	199	EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);