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linux/sound/pci/hda/hda_bind.c
Takashi Iwai 4d75faa044 ALSA: hda - Add regmap support 
This patch adds an infrastructure to support regmap-based verb
accesses.  Because o the asymmetric nature of HD-audio verbs,
especially the amp verbs, we need to translate the verbs as a sort of
pseudo registers to be mapped uniquely in regmap.

In this patch, a pseudo register is built from the NID, the
AC_VERB_GET_* and 8bit parameters, i.e. almost in the form to be sent
to HD-audio bus but without codec address field.  OTOH, for writing,
the same pseudo register is translated to AC_VERB_SET_* automatically.
The AC_VERB_SET_AMP_* verb is re-encoded from the corresponding
AC_VERB_GET_AMP_* verb and parameter at writing.

Some verbs has a single command for read but multiple for writes.  A
write for such a verb is split automatically to multiple verbs.

The patch provides also a few handy helper functions.  They are
designed to be accessible even without regmap.  When no regmap is set
up (e.g. before the codec device instantiation), the direct hardware
access is used.  Also, it tries to avoid the unnecessary power-up.
The power up/down sequence is performed only on demand.

The codec driver needs to call snd_hdac_regmap_exit() and
snd_hdac_regmap_exit() at probe and remove if it wants the regmap
access.

There is one flag added to hdac_device.  When the flag lazy_cache is
set, regmap helper ignores a write for a suspended device and returns
as if it was actually written.  It reduces the hardware access pretty
much, e.g. when adjusting the mixer volume while in idle.  This
assumes that the driver will sync the cache later at resume properly,
so use it carefully.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-03-23 13:19:36 +01:00

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/*
* HD-audio codec driver binding
* Copyright (c) Takashi Iwai <tiwai@suse.de>
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <sound/core.h>
#include "hda_codec.h"
#include "hda_local.h"
/*
* find a matching codec preset
*/
static int hda_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
{
struct hda_codec *codec = container_of(dev, struct hda_codec, core);
struct hda_codec_driver *driver =
container_of(drv, struct hda_codec_driver, core);
const struct hda_codec_preset *preset;
/* check probe_id instead of vendor_id if set */
u32 id = codec->probe_id ? codec->probe_id : codec->core.vendor_id;
for (preset = driver->preset; preset->id; preset++) {
u32 mask = preset->mask;
if (preset->afg && preset->afg != codec->core.afg)
continue;
if (preset->mfg && preset->mfg != codec->core.mfg)
continue;
if (!mask)
mask = ~0;
if (preset->id == (id & mask) &&
(!preset->rev || preset->rev == codec->core.revision_id)) {
codec->preset = preset;
return 1;
}
}
return 0;
}
/* process an unsolicited event */
static void hda_codec_unsol_event(struct hdac_device *dev, unsigned int ev)
{
struct hda_codec *codec = container_of(dev, struct hda_codec, core);
if (codec->patch_ops.unsol_event)
codec->patch_ops.unsol_event(codec, ev);
}
/* reset the codec name from the preset */
static int codec_refresh_name(struct hda_codec *codec, const char *name)
{
if (name) {
kfree(codec->core.chip_name);
codec->core.chip_name = kstrdup(name, GFP_KERNEL);
}
return codec->core.chip_name ? 0 : -ENOMEM;
}
static int hda_codec_driver_probe(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
struct module *owner = dev->driver->owner;
int err;
if (WARN_ON(!codec->preset))
return -EINVAL;
err = codec_refresh_name(codec, codec->preset->name);
if (err < 0)
goto error;
err = snd_hdac_regmap_init(&codec->core);
if (err < 0)
goto error;
if (!try_module_get(owner)) {
err = -EINVAL;
goto error;
}
err = codec->preset->patch(codec);
if (err < 0)
goto error_module;
err = snd_hda_codec_build_pcms(codec);
if (err < 0)
goto error_module;
err = snd_hda_codec_build_controls(codec);
if (err < 0)
goto error_module;
if (codec->card->registered) {
err = snd_card_register(codec->card);
if (err < 0)
goto error_module;
snd_hda_codec_register(codec);
}
codec->core.lazy_cache = true;
return 0;
error_module:
module_put(owner);
error:
snd_hda_codec_cleanup_for_unbind(codec);
return err;
}
static int hda_codec_driver_remove(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
if (codec->patch_ops.free)
codec->patch_ops.free(codec);
snd_hda_codec_cleanup_for_unbind(codec);
module_put(dev->driver->owner);
return 0;
}
static void hda_codec_driver_shutdown(struct device *dev)
{
struct hda_codec *codec = dev_to_hda_codec(dev);
if (!pm_runtime_suspended(dev) && codec->patch_ops.reboot_notify)
codec->patch_ops.reboot_notify(codec);
}
int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
struct module *owner)
{
drv->core.driver.name = name;
drv->core.driver.owner = owner;
drv->core.driver.bus = &snd_hda_bus_type;
drv->core.driver.probe = hda_codec_driver_probe;
drv->core.driver.remove = hda_codec_driver_remove;
drv->core.driver.shutdown = hda_codec_driver_shutdown;
drv->core.driver.pm = &hda_codec_driver_pm;
drv->core.type = HDA_DEV_LEGACY;
drv->core.match = hda_codec_match;
drv->core.unsol_event = hda_codec_unsol_event;
return driver_register(&drv->core.driver);
}
EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
void hda_codec_driver_unregister(struct hda_codec_driver *drv)
{
driver_unregister(&drv->core.driver);
}
EXPORT_SYMBOL_GPL(hda_codec_driver_unregister);
static inline bool codec_probed(struct hda_codec *codec)
{
return device_attach(hda_codec_dev(codec)) > 0 && codec->preset;
}
/* try to auto-load and bind the codec module */
static void codec_bind_module(struct hda_codec *codec)
{
#ifdef MODULE
request_module("snd-hda-codec-id:%08x", codec->core.vendor_id);
if (codec_probed(codec))
return;
request_module("snd-hda-codec-id:%04x*",
(codec->core.vendor_id >> 16) & 0xffff);
if (codec_probed(codec))
return;
#endif
}
#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
/* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */
static bool is_likely_hdmi_codec(struct hda_codec *codec)
{
hda_nid_t nid;
for_each_hda_codec_node(nid, codec) {
unsigned int wcaps = get_wcaps(codec, nid);
switch (get_wcaps_type(wcaps)) {
case AC_WID_AUD_IN:
return false; /* HDMI parser supports only HDMI out */
case AC_WID_AUD_OUT:
if (!(wcaps & AC_WCAP_DIGITAL))
return false;
break;
}
}
return true;
}
#else
/* no HDMI codec parser support */
#define is_likely_hdmi_codec(codec) false
#endif /* CONFIG_SND_HDA_CODEC_HDMI */
static int codec_bind_generic(struct hda_codec *codec)
{
if (codec->probe_id)
return -ENODEV;
if (is_likely_hdmi_codec(codec)) {
codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI;
#if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
request_module("snd-hda-codec-hdmi");
#endif
if (codec_probed(codec))
return 0;
}
codec->probe_id = HDA_CODEC_ID_GENERIC;
#if IS_MODULE(CONFIG_SND_HDA_GENERIC)
request_module("snd-hda-codec-generic");
#endif
if (codec_probed(codec))
return 0;
return -ENODEV;
}
#if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
#define is_generic_config(codec) \
(codec->modelname && !strcmp(codec->modelname, "generic"))
#else
#define is_generic_config(codec) 0
#endif
/**
* snd_hda_codec_configure - (Re-)configure the HD-audio codec
* @codec: the HDA codec
*
* Start parsing of the given codec tree and (re-)initialize the whole
* patch instance.
*
* Returns 0 if successful or a negative error code.
*/
int snd_hda_codec_configure(struct hda_codec *codec)
{
int err;
if (is_generic_config(codec))
codec->probe_id = HDA_CODEC_ID_GENERIC;
else
codec->probe_id = 0;
err = snd_hdac_device_register(&codec->core);
if (err < 0)
return err;
if (!codec->preset)
codec_bind_module(codec);
if (!codec->preset) {
err = codec_bind_generic(codec);
if (err < 0) {
codec_err(codec, "Unable to bind the codec\n");
goto error;
}
}
/* audio codec should override the mixer name */
if (codec->core.afg || !*codec->card->mixername)
snprintf(codec->card->mixername,
sizeof(codec->card->mixername), "%s %s",
codec->core.vendor_name, codec->core.chip_name);
return 0;
error:
snd_hdac_device_unregister(&codec->core);
return err;
}
EXPORT_SYMBOL_GPL(snd_hda_codec_configure);
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