diff options
Diffstat (limited to 'sound/hda/hdac_i915.c')
| -rw-r--r-- | sound/hda/hdac_i915.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c new file mode 100644 index 000000000..5676b8493 --- /dev/null +++ b/sound/hda/hdac_i915.c @@ -0,0 +1,199 @@ +/* + * hdac_i915.c - routines for sync between HD-A core and i915 display driver + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/component.h> +#include <drm/i915_component.h> +#include <sound/core.h> +#include <sound/hdaudio.h> +#include <sound/hda_i915.h> + +static struct i915_audio_component *hdac_acomp; + +int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable) +{ + struct i915_audio_component *acomp = bus->audio_component; + + if (!acomp || !acomp->ops) + return -ENODEV; + + if (!acomp->ops->codec_wake_override) { + dev_warn(bus->dev, + "Invalid codec wake callback\n"); + return 0; + } + + dev_dbg(bus->dev, "%s codec wakeup\n", + enable ? "enable" : "disable"); + + acomp->ops->codec_wake_override(acomp->dev, enable); + + return 0; +} +EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup); + +int snd_hdac_display_power(struct hdac_bus *bus, bool enable) +{ + struct i915_audio_component *acomp = bus->audio_component; + + if (!acomp || !acomp->ops) + return -ENODEV; + + dev_dbg(bus->dev, "display power %s\n", + enable ? "enable" : "disable"); + + if (enable) { + if (!bus->i915_power_refcount++) { + acomp->ops->get_power(acomp->dev); + snd_hdac_set_codec_wakeup(bus, true); + snd_hdac_set_codec_wakeup(bus, false); + } + } else { + WARN_ON(!bus->i915_power_refcount); + if (!--bus->i915_power_refcount) + acomp->ops->put_power(acomp->dev); + } + + return 0; +} +EXPORT_SYMBOL_GPL(snd_hdac_display_power); + +int snd_hdac_get_display_clk(struct hdac_bus *bus) +{ + struct i915_audio_component *acomp = bus->audio_component; + + if (!acomp || !acomp->ops) + return -ENODEV; + + return acomp->ops->get_cdclk_freq(acomp->dev); +} +EXPORT_SYMBOL_GPL(snd_hdac_get_display_clk); + +static int hdac_component_master_bind(struct device *dev) +{ + struct i915_audio_component *acomp = hdac_acomp; + int ret; + + ret = component_bind_all(dev, acomp); + if (ret < 0) + return ret; + + if (WARN_ON(!(acomp->dev && acomp->ops && acomp->ops->get_power && + acomp->ops->put_power && acomp->ops->get_cdclk_freq))) { + ret = -EINVAL; + goto out_unbind; + } + + /* + * Atm, we don't support dynamic unbinding initiated by the child + * component, so pin its containing module until we unbind. + */ + if (!try_module_get(acomp->ops->owner)) { + ret = -ENODEV; + goto out_unbind; + } + + return 0; + +out_unbind: + component_unbind_all(dev, acomp); + + return ret; +} + +static void hdac_component_master_unbind(struct device *dev) +{ + struct i915_audio_component *acomp = hdac_acomp; + + module_put(acomp->ops->owner); + component_unbind_all(dev, acomp); + WARN_ON(acomp->ops || acomp->dev); +} + +static const struct component_master_ops hdac_component_master_ops = { + .bind = hdac_component_master_bind, + .unbind = hdac_component_master_unbind, +}; + +static int hdac_component_master_match(struct device *dev, void *data) +{ + /* i915 is the only supported component */ + return !strcmp(dev->driver->name, "i915"); +} + +int snd_hdac_i915_init(struct hdac_bus *bus) +{ + struct component_match *match = NULL; + struct device *dev = bus->dev; + struct i915_audio_component *acomp; + int ret; + + acomp = kzalloc(sizeof(*acomp), GFP_KERNEL); + if (!acomp) + return -ENOMEM; + bus->audio_component = acomp; + hdac_acomp = acomp; + + component_match_add(dev, &match, hdac_component_master_match, bus); + ret = component_master_add_with_match(dev, &hdac_component_master_ops, + match); + if (ret < 0) + goto out_err; + + /* + * Atm, we don't support deferring the component binding, so make sure + * i915 is loaded and that the binding successfully completes. + */ + request_module("i915"); + + if (!acomp->ops) { + ret = -ENODEV; + goto out_master_del; + } + dev_dbg(dev, "bound to i915 component master\n"); + + return 0; +out_master_del: + component_master_del(dev, &hdac_component_master_ops); +out_err: + kfree(acomp); + bus->audio_component = NULL; + dev_err(dev, "failed to add i915 component master (%d)\n", ret); + + return ret; +} +EXPORT_SYMBOL_GPL(snd_hdac_i915_init); + +int snd_hdac_i915_exit(struct hdac_bus *bus) +{ + struct device *dev = bus->dev; + struct i915_audio_component *acomp = bus->audio_component; + + if (!acomp) + return 0; + + WARN_ON(bus->i915_power_refcount); + if (bus->i915_power_refcount > 0 && acomp->ops) + acomp->ops->put_power(acomp->dev); + + component_master_del(dev, &hdac_component_master_ops); + + kfree(acomp); + bus->audio_component = NULL; + + return 0; +} +EXPORT_SYMBOL_GPL(snd_hdac_i915_exit); |