2 * hdac_i915.c - routines for sync between HD-A core and i915 display driver
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)
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
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>
24 static struct i915_audio_component *hdac_acomp;
26 int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable)
28 struct i915_audio_component *acomp = bus->audio_component;
30 if (!acomp || !acomp->ops)
33 if (!acomp->ops->codec_wake_override) {
35 "Invalid codec wake callback\n");
39 dev_dbg(bus->dev, "%s codec wakeup\n",
40 enable ? "enable" : "disable");
42 acomp->ops->codec_wake_override(acomp->dev, enable);
46 EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
48 int snd_hdac_display_power(struct hdac_bus *bus, bool enable)
50 struct i915_audio_component *acomp = bus->audio_component;
52 if (!acomp || !acomp->ops)
55 dev_dbg(bus->dev, "display power %s\n",
56 enable ? "enable" : "disable");
59 if (!bus->i915_power_refcount++)
60 acomp->ops->get_power(acomp->dev);
62 WARN_ON(!bus->i915_power_refcount);
63 if (!--bus->i915_power_refcount)
64 acomp->ops->put_power(acomp->dev);
69 EXPORT_SYMBOL_GPL(snd_hdac_display_power);
71 int snd_hdac_get_display_clk(struct hdac_bus *bus)
73 struct i915_audio_component *acomp = bus->audio_component;
75 if (!acomp || !acomp->ops)
78 return acomp->ops->get_cdclk_freq(acomp->dev);
80 EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk);
82 static int hdac_component_master_bind(struct device *dev)
84 struct i915_audio_component *acomp = hdac_acomp;
87 ret = component_bind_all(dev, acomp);
91 if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power &&
92 acomp->ops->put_power && acomp->ops->get_cdclk_freq))) {
98 * Atm, we don't support dynamic unbinding initiated by the child
99 * component, so pin its containing module until we unbind.
101 if (!try_module_get(acomp->ops->owner)) {
109 component_unbind_all(dev, acomp);
114 static void hdac_component_master_unbind(struct device *dev)
116 struct i915_audio_component *acomp = hdac_acomp;
118 module_put(acomp->ops->owner);
119 component_unbind_all(dev, acomp);
120 WARN_ON(acomp->ops || acomp->dev);
123 static const struct component_master_ops hdac_component_master_ops = {
124 .bind = hdac_component_master_bind,
125 .unbind = hdac_component_master_unbind,
128 static int hdac_component_master_match(struct device *dev, void *data)
130 /* i915 is the only supported component */
131 return !strcmp(dev->driver->name, "i915");
134 int snd_hdac_i915_init(struct hdac_bus *bus)
136 struct component_match *match = NULL;
137 struct device *dev = bus->dev;
138 struct i915_audio_component *acomp;
141 acomp = kzalloc(sizeof(*acomp), GFP_KERNEL);
144 bus->audio_component = acomp;
147 component_match_add(dev, &match, hdac_component_master_match, bus);
148 ret = component_master_add_with_match(dev, &hdac_component_master_ops,
154 * Atm, we don't support deferring the component binding, so make sure
155 * i915 is loaded and that the binding successfully completes.
157 request_module("i915");
163 dev_dbg(dev, "bound to i915 component master\n");
167 component_master_del(dev, &hdac_component_master_ops);
170 bus->audio_component = NULL;
171 dev_err(dev, "failed to add i915 component master (%d)\n", ret);
175 EXPORT_SYMBOL_GPL(snd_hdac_i915_init);
177 int snd_hdac_i915_exit(struct hdac_bus *bus)
179 struct device *dev = bus->dev;
180 struct i915_audio_component *acomp = bus->audio_component;
185 WARN_ON(bus->i915_power_refcount);
186 if (bus->i915_power_refcount > 0 && acomp->ops)
187 acomp->ops->put_power(acomp->dev);
189 component_master_del(dev, &hdac_component_master_ops);
192 bus->audio_component = NULL;
196 EXPORT_SYMBOL_GPL(snd_hdac_i915_exit);