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