linux/sound/pci/hda/hda_bind.c
Takashi Iwai c4c2533f80 ALSA: hda - Fix possible runtime PM refcount unbalance
When the driver is unloaded before the codec is bound, it still keeps
the runtime PM refcount up, and results in the unbalance.  This patch
covers these cases by introducing a flag indicating the runtime PM
initialization and handling the codec registration procedure more
properly.  It also fixes the missing input beep device as a gratis,
too.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-03-23 13:17:48 +01:00

270 lines
6.5 KiB
C

/*
* 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;
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);
}
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);