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); |