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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/init.h>#include <linux/module.h>#include <linux/pci.h>#include <linux/component.h>#include <linux/string_choices.h>#include <sound/core.h>#include <sound/hdaudio.h>#include <sound/hda_component.h>#include <sound/hda_register.h>
static void hdac_acomp_release(struct device *dev, void *res){}
static struct drm_audio_component *hdac_get_acomp(struct device *dev){ return devres_find(dev, hdac_acomp_release, NULL, NULL);}
/** * snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup * @bus: HDA core bus * @enable: enable or disable the wakeup * * This function is supposed to be used only by a HD-audio controller * driver that needs the interaction with graphics driver. * * This function should be called during the chip reset, also called at * resume for updating STATESTS register read. * * Returns zero for success or a negative error code. */int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable){ struct drm_audio_component *acomp = bus->audio_component;
if (!acomp || !acomp->ops) return -ENODEV;
if (!acomp->ops->codec_wake_override) return 0;
dev_dbg(bus->dev, "%s codec wakeup\n", str_enable_disable(enable));
acomp->ops->codec_wake_override(acomp->dev, enable);
return 0;}EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup);
/** * snd_hdac_display_power - Power up / down the power refcount * @bus: HDA core bus * @idx: HDA codec address, pass HDA_CODEC_IDX_CONTROLLER for controller * @enable: power up or down * * This function is used by either HD-audio controller or codec driver that * needs the interaction with graphics driver. * * This function updates the power status, and calls the get_power() and * put_power() ops accordingly, toggling the codec wakeup, too. */void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, bool enable){ struct drm_audio_component *acomp = bus->audio_component;
dev_dbg(bus->dev, "display power %s\n", str_enable_disable(enable));
guard(mutex)(&bus->lock); assign_bit(idx, &bus->display_power_status, enable);
if (!acomp || !acomp->ops) return;
if (bus->display_power_status) { if (!bus->display_power_active) { unsigned long cookie = -1;
if (acomp->ops->get_power) cookie = acomp->ops->get_power(acomp->dev);
snd_hdac_set_codec_wakeup(bus, true); snd_hdac_set_codec_wakeup(bus, false); bus->display_power_active = cookie; } } else { if (bus->display_power_active) { unsigned long cookie = bus->display_power_active;
if (acomp->ops->put_power) acomp->ops->put_power(acomp->dev, cookie);
bus->display_power_active = 0; } }}EXPORT_SYMBOL_GPL(snd_hdac_display_power);
/** * snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate * @codec: HDA codec * @nid: the pin widget NID * @dev_id: device identifier * @rate: the sample rate to set * * This function is supposed to be used only by a HD-audio controller * driver that needs the interaction with graphics driver. * * This function sets N/CTS value based on the given sample rate. * Returns zero for success, or a negative error code. */int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid, int dev_id, int rate){ struct hdac_bus *bus = codec->bus; struct drm_audio_component *acomp = bus->audio_component; int port, pipe;
if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate) return -ENODEV; port = nid; if (acomp->audio_ops && acomp->audio_ops->pin2port) { port = acomp->audio_ops->pin2port(codec, nid); if (port < 0) return -EINVAL; } pipe = dev_id; return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate);}EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate);
/** * snd_hdac_acomp_get_eld - Get the audio state and ELD via component * @codec: HDA codec * @nid: the pin widget NID * @dev_id: device identifier * @audio_enabled: the pointer to store the current audio state * @buffer: the buffer pointer to store ELD bytes * @max_bytes: the max bytes to be stored on @buffer * * This function is supposed to be used only by a HD-audio controller * driver that needs the interaction with graphics driver. * * This function queries the current state of the audio on the given * digital port and fetches the ELD bytes onto the given buffer. * It returns the number of bytes for the total ELD data, zero for * invalid ELD, or a negative error code. * * The return size is the total bytes required for the whole ELD bytes, * thus it may be over @max_bytes. If it's over @max_bytes, it implies * that only a part of ELD bytes have been fetched. */int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id, bool *audio_enabled, char *buffer, int max_bytes){ struct hdac_bus *bus = codec->bus; struct drm_audio_component *acomp = bus->audio_component; int port, pipe;
if (!acomp || !acomp->ops || !acomp->ops->get_eld) return -ENODEV;
port = nid; if (acomp->audio_ops && acomp->audio_ops->pin2port) { port = acomp->audio_ops->pin2port(codec, nid); if (port < 0) return -EINVAL; } pipe = dev_id; return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled, buffer, max_bytes);}EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld);
static int hdac_component_master_bind(struct device *dev){ struct drm_audio_component *acomp = hdac_get_acomp(dev); int ret;
if (WARN_ON(!acomp)) return -EINVAL;
ret = component_bind_all(dev, acomp); if (ret < 0) return ret;
if (WARN_ON(!(acomp->dev && acomp->ops))) { ret = -EINVAL; goto out_unbind; }
/* pin the module to avoid dynamic unbinding, but only if given */ if (!try_module_get(acomp->ops->owner)) { ret = -ENODEV; goto out_unbind; }
if (acomp->audio_ops && acomp->audio_ops->master_bind) { ret = acomp->audio_ops->master_bind(dev, acomp); if (ret < 0) goto module_put; }
complete_all(&acomp->master_bind_complete); return 0;
module_put: module_put(acomp->ops->owner);out_unbind: component_unbind_all(dev, acomp); complete_all(&acomp->master_bind_complete);
return ret;}
static void hdac_component_master_unbind(struct device *dev){ struct drm_audio_component *acomp = hdac_get_acomp(dev);
if (acomp->audio_ops && acomp->audio_ops->master_unbind) acomp->audio_ops->master_unbind(dev, 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,};
/** * snd_hdac_acomp_register_notifier - Register audio component ops * @bus: HDA core bus * @aops: audio component ops * * This function is supposed to be used only by a HD-audio controller * driver that needs the interaction with graphics driver. * * This function sets the given ops to be called by the graphics driver. * * Returns zero for success or a negative error code. */int snd_hdac_acomp_register_notifier(struct hdac_bus *bus, const struct drm_audio_component_audio_ops *aops){ if (!bus->audio_component) return -ENODEV;
bus->audio_component->audio_ops = aops; return 0;}EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier);
/** * snd_hdac_acomp_init - Initialize audio component * @bus: HDA core bus * @aops: audio component ops * @match_master: match function for finding components * @extra_size: Extra bytes to allocate * * This function is supposed to be used only by a HD-audio controller * driver that needs the interaction with graphics driver. * * This function initializes and sets up the audio component to communicate * with graphics driver. * * Unlike snd_hdac_i915_init(), this function doesn't synchronize with the * binding with the DRM component. Each caller needs to sync via master_bind * audio_ops. * * Returns zero for success or a negative error code. */int snd_hdac_acomp_init(struct hdac_bus *bus, const struct drm_audio_component_audio_ops *aops, int (*match_master)(struct device *, int, void *), size_t extra_size){ struct component_match *match = NULL; struct device *dev = bus->dev; struct drm_audio_component *acomp; int ret;
if (WARN_ON(hdac_get_acomp(dev))) return -EBUSY;
acomp = devres_alloc(hdac_acomp_release, sizeof(*acomp) + extra_size, GFP_KERNEL); if (!acomp) return -ENOMEM; acomp->audio_ops = aops; init_completion(&acomp->master_bind_complete); bus->audio_component = acomp; devres_add(dev, acomp);
component_match_add_typed(dev, &match, match_master, bus); ret = component_master_add_with_match(dev, &hdac_component_master_ops, match); if (ret < 0) goto out_err;
return 0;
out_err: bus->audio_component = NULL; devres_destroy(dev, hdac_acomp_release, NULL, NULL); dev_info(dev, "failed to add audio component master (%d)\n", ret);
return ret;}EXPORT_SYMBOL_GPL(snd_hdac_acomp_init);
/** * snd_hdac_acomp_exit - Finalize audio component * @bus: HDA core bus * * This function is supposed to be used only by a HD-audio controller * driver that needs the interaction with graphics driver. * * This function releases the audio component that has been used. * * Returns zero for success or a negative error code. */int snd_hdac_acomp_exit(struct hdac_bus *bus){ struct device *dev = bus->dev; struct drm_audio_component *acomp = bus->audio_component;
if (!acomp) return 0;
if (WARN_ON(bus->display_power_active) && acomp->ops) acomp->ops->put_power(acomp->dev, bus->display_power_active);
bus->display_power_active = 0; bus->display_power_status = 0;
component_master_del(dev, &hdac_component_master_ops);
bus->audio_component = NULL; devres_destroy(dev, hdac_acomp_release, NULL, NULL);
return 0;}EXPORT_SYMBOL_GPL(snd_hdac_acomp_exit);