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         } 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
  75         if (!acomp || !acomp->ops)
  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
 182         if (!acomp)
 183                 return 0;
 184
 185         WARN_ON(bus->i915_power_refcount);
 186         if (bus->i915_power_refcount > 0 && acomp->ops)
 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);