sound/hda/hdac_i915.c

   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
  30         if (!acomp || !acomp->ops)
  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
  52         if (!acomp || !acomp->ops)
  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                         snd_hdac_set_codec_wakeup(bus, true);
  62                         snd_hdac_set_codec_wakeup(bus, false);
  63                 }
  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
  78         if (!acomp || !acomp->ops)
  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
 185         if (!acomp)
 186                 return 0;
 187
 188         WARN_ON(bus->i915_power_refcount);
 189         if (bus->i915_power_refcount > 0 && acomp->ops)
 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);