Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 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 | |
Takashi Iwai | 692af90 | 2015-06-10 12:15:27 +0200 | [diff] [blame] | 30 | if (!acomp || !acomp->ops) |
Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 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 | |
Takashi Iwai | 692af90 | 2015-06-10 12:15:27 +0200 | [diff] [blame] | 52 | if (!acomp || !acomp->ops) |
Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 53 | return -ENODEV; |
| 54 | |
| 55 | dev_dbg(bus->dev, "display power %s\n", |
| 56 | enable ? "enable" : "disable"); |
| 57 | |
| 58 | if (enable) { |
David Henningsson | 033ea34 | 2015-07-16 10:39:24 +0200 | [diff] [blame] | 59 | if (!bus->i915_power_refcount++) { |
Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 60 | acomp->ops->get_power(acomp->dev); |
David Henningsson | 033ea34 | 2015-07-16 10:39:24 +0200 | [diff] [blame] | 61 | snd_hdac_set_codec_wakeup(bus, true); |
| 62 | snd_hdac_set_codec_wakeup(bus, false); |
| 63 | } |
Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 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 | |
Takashi Iwai | 692af90 | 2015-06-10 12:15:27 +0200 | [diff] [blame] | 78 | if (!acomp || !acomp->ops) |
Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 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 | |
Takashi Iwai | 692af90 | 2015-06-10 12:15:27 +0200 | [diff] [blame] | 185 | if (!acomp) |
| 186 | return 0; |
| 187 | |
Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 188 | WARN_ON(bus->i915_power_refcount); |
Takashi Iwai | 692af90 | 2015-06-10 12:15:27 +0200 | [diff] [blame] | 189 | if (bus->i915_power_refcount > 0 && acomp->ops) |
Mengdong Lin | 98d8fc6 | 2015-05-19 22:29:30 +0800 | [diff] [blame] | 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); |