![Keyon Jie](/assets/img/avatar_default.png)
Make W=1 throws a lot of warnings, with multiple misalignments between function params and their descriptions. Signed-off-by: Keyon Jie <yang.jie@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20200113205638.27338-1-pierre-louis.bossart@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
352 lines
9.6 KiB
C
352 lines
9.6 KiB
C
// 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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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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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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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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