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354 lines
9.7 KiB
354 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// hdac_component.c - routines for sync between HD-A core and DRM driver |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/component.h> |
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#include <sound/core.h> |
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#include <sound/hdaudio.h> |
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#include <sound/hda_component.h> |
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#include <sound/hda_register.h> |
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static void hdac_acomp_release(struct device *dev, void *res) |
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{ |
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} |
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static struct drm_audio_component *hdac_get_acomp(struct device *dev) |
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{ |
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return devres_find(dev, hdac_acomp_release, NULL, NULL); |
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} |
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/** |
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* snd_hdac_set_codec_wakeup - Enable / disable HDMI/DP codec wakeup |
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* @bus: HDA core bus |
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* @enable: enable or disable the wakeup |
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* |
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* This function is supposed to be used only by a HD-audio controller |
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* driver that needs the interaction with graphics driver. |
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* |
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* This function should be called during the chip reset, also called at |
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* resume for updating STATESTS register read. |
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* |
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* Returns zero for success or a negative error code. |
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*/ |
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int snd_hdac_set_codec_wakeup(struct hdac_bus *bus, bool enable) |
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{ |
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struct drm_audio_component *acomp = bus->audio_component; |
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if (!acomp || !acomp->ops) |
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return -ENODEV; |
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if (!acomp->ops->codec_wake_override) |
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return 0; |
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dev_dbg(bus->dev, "%s codec wakeup\n", |
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enable ? "enable" : "disable"); |
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acomp->ops->codec_wake_override(acomp->dev, enable); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_set_codec_wakeup); |
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/** |
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* snd_hdac_display_power - Power up / down the power refcount |
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* @bus: HDA core bus |
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* @idx: HDA codec address, pass HDA_CODEC_IDX_CONTROLLER for controller |
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* @enable: power up or down |
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* |
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* This function is used by either HD-audio controller or codec driver that |
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* needs the interaction with graphics driver. |
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* |
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* This function updates the power status, and calls the get_power() and |
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* put_power() ops accordingly, toggling the codec wakeup, too. |
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*/ |
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void snd_hdac_display_power(struct hdac_bus *bus, unsigned int idx, bool enable) |
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{ |
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struct drm_audio_component *acomp = bus->audio_component; |
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dev_dbg(bus->dev, "display power %s\n", |
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enable ? "enable" : "disable"); |
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mutex_lock(&bus->lock); |
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if (enable) |
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set_bit(idx, &bus->display_power_status); |
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else |
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clear_bit(idx, &bus->display_power_status); |
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if (!acomp || !acomp->ops) |
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goto unlock; |
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if (bus->display_power_status) { |
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if (!bus->display_power_active) { |
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unsigned long cookie = -1; |
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if (acomp->ops->get_power) |
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cookie = acomp->ops->get_power(acomp->dev); |
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snd_hdac_set_codec_wakeup(bus, true); |
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snd_hdac_set_codec_wakeup(bus, false); |
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bus->display_power_active = cookie; |
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} |
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} else { |
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if (bus->display_power_active) { |
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unsigned long cookie = bus->display_power_active; |
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if (acomp->ops->put_power) |
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acomp->ops->put_power(acomp->dev, cookie); |
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bus->display_power_active = 0; |
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} |
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} |
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unlock: |
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mutex_unlock(&bus->lock); |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_display_power); |
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/** |
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* snd_hdac_sync_audio_rate - Set N/CTS based on the sample rate |
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* @codec: HDA codec |
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* @nid: the pin widget NID |
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* @dev_id: device identifier |
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* @rate: the sample rate to set |
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* |
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* This function is supposed to be used only by a HD-audio controller |
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* driver that needs the interaction with graphics driver. |
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* |
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* This function sets N/CTS value based on the given sample rate. |
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* Returns zero for success, or a negative error code. |
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*/ |
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int snd_hdac_sync_audio_rate(struct hdac_device *codec, hda_nid_t nid, |
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int dev_id, int rate) |
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{ |
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struct hdac_bus *bus = codec->bus; |
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struct drm_audio_component *acomp = bus->audio_component; |
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int port, pipe; |
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if (!acomp || !acomp->ops || !acomp->ops->sync_audio_rate) |
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return -ENODEV; |
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port = nid; |
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if (acomp->audio_ops && acomp->audio_ops->pin2port) { |
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port = acomp->audio_ops->pin2port(codec, nid); |
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if (port < 0) |
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return -EINVAL; |
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} |
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pipe = dev_id; |
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return acomp->ops->sync_audio_rate(acomp->dev, port, pipe, rate); |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_sync_audio_rate); |
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/** |
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* snd_hdac_acomp_get_eld - Get the audio state and ELD via component |
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* @codec: HDA codec |
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* @nid: the pin widget NID |
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* @dev_id: device identifier |
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* @audio_enabled: the pointer to store the current audio state |
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* @buffer: the buffer pointer to store ELD bytes |
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* @max_bytes: the max bytes to be stored on @buffer |
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* |
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* This function is supposed to be used only by a HD-audio controller |
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* driver that needs the interaction with graphics driver. |
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* |
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* This function queries the current state of the audio on the given |
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* digital port and fetches the ELD bytes onto the given buffer. |
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* It returns the number of bytes for the total ELD data, zero for |
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* invalid ELD, or a negative error code. |
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* |
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* The return size is the total bytes required for the whole ELD bytes, |
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* thus it may be over @max_bytes. If it's over @max_bytes, it implies |
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* that only a part of ELD bytes have been fetched. |
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*/ |
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int snd_hdac_acomp_get_eld(struct hdac_device *codec, hda_nid_t nid, int dev_id, |
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bool *audio_enabled, char *buffer, int max_bytes) |
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{ |
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struct hdac_bus *bus = codec->bus; |
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struct drm_audio_component *acomp = bus->audio_component; |
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int port, pipe; |
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if (!acomp || !acomp->ops || !acomp->ops->get_eld) |
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return -ENODEV; |
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port = nid; |
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if (acomp->audio_ops && acomp->audio_ops->pin2port) { |
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port = acomp->audio_ops->pin2port(codec, nid); |
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if (port < 0) |
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return -EINVAL; |
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} |
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pipe = dev_id; |
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return acomp->ops->get_eld(acomp->dev, port, pipe, audio_enabled, |
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buffer, max_bytes); |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_acomp_get_eld); |
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static int hdac_component_master_bind(struct device *dev) |
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{ |
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struct drm_audio_component *acomp = hdac_get_acomp(dev); |
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int ret; |
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if (WARN_ON(!acomp)) |
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return -EINVAL; |
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ret = component_bind_all(dev, acomp); |
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if (ret < 0) |
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return ret; |
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if (WARN_ON(!(acomp->dev && acomp->ops))) { |
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ret = -EINVAL; |
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goto out_unbind; |
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} |
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/* pin the module to avoid dynamic unbinding, but only if given */ |
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if (!try_module_get(acomp->ops->owner)) { |
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ret = -ENODEV; |
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goto out_unbind; |
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} |
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if (acomp->audio_ops && acomp->audio_ops->master_bind) { |
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ret = acomp->audio_ops->master_bind(dev, acomp); |
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if (ret < 0) |
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goto module_put; |
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} |
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complete_all(&acomp->master_bind_complete); |
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return 0; |
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module_put: |
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module_put(acomp->ops->owner); |
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out_unbind: |
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component_unbind_all(dev, acomp); |
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complete_all(&acomp->master_bind_complete); |
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return ret; |
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} |
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static void hdac_component_master_unbind(struct device *dev) |
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{ |
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struct drm_audio_component *acomp = hdac_get_acomp(dev); |
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if (acomp->audio_ops && acomp->audio_ops->master_unbind) |
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acomp->audio_ops->master_unbind(dev, acomp); |
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module_put(acomp->ops->owner); |
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component_unbind_all(dev, acomp); |
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WARN_ON(acomp->ops || acomp->dev); |
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} |
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static const struct component_master_ops hdac_component_master_ops = { |
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.bind = hdac_component_master_bind, |
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.unbind = hdac_component_master_unbind, |
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}; |
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/** |
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* snd_hdac_acomp_register_notifier - Register audio component ops |
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* @bus: HDA core bus |
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* @aops: audio component ops |
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* |
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* This function is supposed to be used only by a HD-audio controller |
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* driver that needs the interaction with graphics driver. |
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* |
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* This function sets the given ops to be called by the graphics driver. |
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* |
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* Returns zero for success or a negative error code. |
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*/ |
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int snd_hdac_acomp_register_notifier(struct hdac_bus *bus, |
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const struct drm_audio_component_audio_ops *aops) |
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{ |
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if (!bus->audio_component) |
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return -ENODEV; |
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bus->audio_component->audio_ops = aops; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_acomp_register_notifier); |
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/** |
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* snd_hdac_acomp_init - Initialize audio component |
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* @bus: HDA core bus |
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* @aops: audio component ops |
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* @match_master: match function for finding components |
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* @extra_size: Extra bytes to allocate |
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* |
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* This function is supposed to be used only by a HD-audio controller |
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* driver that needs the interaction with graphics driver. |
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* |
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* This function initializes and sets up the audio component to communicate |
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* with graphics driver. |
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* |
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* Unlike snd_hdac_i915_init(), this function doesn't synchronize with the |
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* binding with the DRM component. Each caller needs to sync via master_bind |
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* audio_ops. |
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* |
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* Returns zero for success or a negative error code. |
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*/ |
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int snd_hdac_acomp_init(struct hdac_bus *bus, |
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const struct drm_audio_component_audio_ops *aops, |
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int (*match_master)(struct device *, int, void *), |
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size_t extra_size) |
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{ |
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struct component_match *match = NULL; |
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struct device *dev = bus->dev; |
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struct drm_audio_component *acomp; |
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int ret; |
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if (WARN_ON(hdac_get_acomp(dev))) |
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return -EBUSY; |
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acomp = devres_alloc(hdac_acomp_release, sizeof(*acomp) + extra_size, |
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GFP_KERNEL); |
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if (!acomp) |
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return -ENOMEM; |
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acomp->audio_ops = aops; |
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init_completion(&acomp->master_bind_complete); |
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bus->audio_component = acomp; |
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devres_add(dev, acomp); |
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component_match_add_typed(dev, &match, match_master, bus); |
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ret = component_master_add_with_match(dev, &hdac_component_master_ops, |
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match); |
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if (ret < 0) |
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goto out_err; |
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return 0; |
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out_err: |
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bus->audio_component = NULL; |
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devres_destroy(dev, hdac_acomp_release, NULL, NULL); |
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dev_info(dev, "failed to add audio component master (%d)\n", ret); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_acomp_init); |
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/** |
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* snd_hdac_acomp_exit - Finalize audio component |
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* @bus: HDA core bus |
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* |
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* This function is supposed to be used only by a HD-audio controller |
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* driver that needs the interaction with graphics driver. |
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* |
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* This function releases the audio component that has been used. |
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* |
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* Returns zero for success or a negative error code. |
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*/ |
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int snd_hdac_acomp_exit(struct hdac_bus *bus) |
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{ |
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struct device *dev = bus->dev; |
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struct drm_audio_component *acomp = bus->audio_component; |
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if (!acomp) |
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return 0; |
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if (WARN_ON(bus->display_power_active) && acomp->ops) |
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acomp->ops->put_power(acomp->dev, bus->display_power_active); |
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bus->display_power_active = 0; |
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bus->display_power_status = 0; |
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component_master_del(dev, &hdac_component_master_ops); |
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bus->audio_component = NULL; |
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devres_destroy(dev, hdac_acomp_release, NULL, NULL); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(snd_hdac_acomp_exit);
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