cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hda_bind.c (8110B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * HD-audio codec driver binding
      4 * Copyright (c) Takashi Iwai <tiwai@suse.de>
      5 */
      6
      7#include <linux/init.h>
      8#include <linux/slab.h>
      9#include <linux/mutex.h>
     10#include <linux/module.h>
     11#include <linux/export.h>
     12#include <linux/pm.h>
     13#include <linux/pm_runtime.h>
     14#include <sound/core.h>
     15#include <sound/hda_codec.h>
     16#include "hda_local.h"
     17#include "hda_jack.h"
     18
     19/*
     20 * find a matching codec id
     21 */
     22static int hda_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
     23{
     24	struct hda_codec *codec = container_of(dev, struct hda_codec, core);
     25	struct hda_codec_driver *driver =
     26		container_of(drv, struct hda_codec_driver, core);
     27	const struct hda_device_id *list;
     28	/* check probe_id instead of vendor_id if set */
     29	u32 id = codec->probe_id ? codec->probe_id : codec->core.vendor_id;
     30	u32 rev_id = codec->core.revision_id;
     31
     32	for (list = driver->id; list->vendor_id; list++) {
     33		if (list->vendor_id == id &&
     34		    (!list->rev_id || list->rev_id == rev_id)) {
     35			codec->preset = list;
     36			return 1;
     37		}
     38	}
     39	return 0;
     40}
     41
     42/* process an unsolicited event */
     43static void hda_codec_unsol_event(struct hdac_device *dev, unsigned int ev)
     44{
     45	struct hda_codec *codec = container_of(dev, struct hda_codec, core);
     46
     47	/* ignore unsol events during shutdown */
     48	if (codec->bus->shutdown)
     49		return;
     50
     51	/* ignore unsol events during system suspend/resume */
     52	if (codec->core.dev.power.power_state.event != PM_EVENT_ON)
     53		return;
     54
     55	if (codec->patch_ops.unsol_event)
     56		codec->patch_ops.unsol_event(codec, ev);
     57}
     58
     59/**
     60 * snd_hda_codec_set_name - set the codec name
     61 * @codec: the HDA codec
     62 * @name: name string to set
     63 */
     64int snd_hda_codec_set_name(struct hda_codec *codec, const char *name)
     65{
     66	int err;
     67
     68	if (!name)
     69		return 0;
     70	err = snd_hdac_device_set_chip_name(&codec->core, name);
     71	if (err < 0)
     72		return err;
     73
     74	/* update the mixer name */
     75	if (!*codec->card->mixername ||
     76	    codec->bus->mixer_assigned >= codec->core.addr) {
     77		snprintf(codec->card->mixername,
     78			 sizeof(codec->card->mixername), "%s %s",
     79			 codec->core.vendor_name, codec->core.chip_name);
     80		codec->bus->mixer_assigned = codec->core.addr;
     81	}
     82
     83	return 0;
     84}
     85EXPORT_SYMBOL_GPL(snd_hda_codec_set_name);
     86
     87static int hda_codec_driver_probe(struct device *dev)
     88{
     89	struct hda_codec *codec = dev_to_hda_codec(dev);
     90	struct module *owner = dev->driver->owner;
     91	hda_codec_patch_t patch;
     92	int err;
     93
     94	if (codec->bus->core.ext_ops) {
     95		if (WARN_ON(!codec->bus->core.ext_ops->hdev_attach))
     96			return -EINVAL;
     97		return codec->bus->core.ext_ops->hdev_attach(&codec->core);
     98	}
     99
    100	if (WARN_ON(!codec->preset))
    101		return -EINVAL;
    102
    103	err = snd_hda_codec_set_name(codec, codec->preset->name);
    104	if (err < 0)
    105		goto error;
    106	err = snd_hdac_regmap_init(&codec->core);
    107	if (err < 0)
    108		goto error;
    109
    110	if (!try_module_get(owner)) {
    111		err = -EINVAL;
    112		goto error;
    113	}
    114
    115	patch = (hda_codec_patch_t)codec->preset->driver_data;
    116	if (patch) {
    117		err = patch(codec);
    118		if (err < 0)
    119			goto error_module_put;
    120	}
    121
    122	err = snd_hda_codec_build_pcms(codec);
    123	if (err < 0)
    124		goto error_module;
    125	err = snd_hda_codec_build_controls(codec);
    126	if (err < 0)
    127		goto error_module;
    128	/* only register after the bus probe finished; otherwise it's racy */
    129	if (!codec->bus->bus_probing && codec->card->registered) {
    130		err = snd_card_register(codec->card);
    131		if (err < 0)
    132			goto error_module;
    133		snd_hda_codec_register(codec);
    134	}
    135
    136	codec->core.lazy_cache = true;
    137	return 0;
    138
    139 error_module:
    140	if (codec->patch_ops.free)
    141		codec->patch_ops.free(codec);
    142 error_module_put:
    143	module_put(owner);
    144
    145 error:
    146	snd_hda_codec_cleanup_for_unbind(codec);
    147	return err;
    148}
    149
    150static int hda_codec_driver_remove(struct device *dev)
    151{
    152	struct hda_codec *codec = dev_to_hda_codec(dev);
    153
    154	if (codec->bus->core.ext_ops) {
    155		if (WARN_ON(!codec->bus->core.ext_ops->hdev_detach))
    156			return -EINVAL;
    157		return codec->bus->core.ext_ops->hdev_detach(&codec->core);
    158	}
    159
    160	refcount_dec(&codec->pcm_ref);
    161	snd_hda_codec_disconnect_pcms(codec);
    162	snd_hda_jack_tbl_disconnect(codec);
    163	wait_event(codec->remove_sleep, !refcount_read(&codec->pcm_ref));
    164	snd_power_sync_ref(codec->bus->card);
    165
    166	if (codec->patch_ops.free)
    167		codec->patch_ops.free(codec);
    168	snd_hda_codec_cleanup_for_unbind(codec);
    169	module_put(dev->driver->owner);
    170	return 0;
    171}
    172
    173static void hda_codec_driver_shutdown(struct device *dev)
    174{
    175	snd_hda_codec_shutdown(dev_to_hda_codec(dev));
    176}
    177
    178int __hda_codec_driver_register(struct hda_codec_driver *drv, const char *name,
    179			       struct module *owner)
    180{
    181	drv->core.driver.name = name;
    182	drv->core.driver.owner = owner;
    183	drv->core.driver.bus = &snd_hda_bus_type;
    184	drv->core.driver.probe = hda_codec_driver_probe;
    185	drv->core.driver.remove = hda_codec_driver_remove;
    186	drv->core.driver.shutdown = hda_codec_driver_shutdown;
    187	drv->core.driver.pm = &hda_codec_driver_pm;
    188	drv->core.type = HDA_DEV_LEGACY;
    189	drv->core.match = hda_codec_match;
    190	drv->core.unsol_event = hda_codec_unsol_event;
    191	return driver_register(&drv->core.driver);
    192}
    193EXPORT_SYMBOL_GPL(__hda_codec_driver_register);
    194
    195void hda_codec_driver_unregister(struct hda_codec_driver *drv)
    196{
    197	driver_unregister(&drv->core.driver);
    198}
    199EXPORT_SYMBOL_GPL(hda_codec_driver_unregister);
    200
    201static inline bool codec_probed(struct hda_codec *codec)
    202{
    203	return device_attach(hda_codec_dev(codec)) > 0 && codec->preset;
    204}
    205
    206/* try to auto-load codec module */
    207static void request_codec_module(struct hda_codec *codec)
    208{
    209#ifdef MODULE
    210	char modalias[32];
    211	const char *mod = NULL;
    212
    213	switch (codec->probe_id) {
    214	case HDA_CODEC_ID_GENERIC_HDMI:
    215#if IS_MODULE(CONFIG_SND_HDA_CODEC_HDMI)
    216		mod = "snd-hda-codec-hdmi";
    217#endif
    218		break;
    219	case HDA_CODEC_ID_GENERIC:
    220#if IS_MODULE(CONFIG_SND_HDA_GENERIC)
    221		mod = "snd-hda-codec-generic";
    222#endif
    223		break;
    224	default:
    225		snd_hdac_codec_modalias(&codec->core, modalias, sizeof(modalias));
    226		mod = modalias;
    227		break;
    228	}
    229
    230	if (mod)
    231		request_module(mod);
    232#endif /* MODULE */
    233}
    234
    235/* try to auto-load and bind the codec module */
    236static void codec_bind_module(struct hda_codec *codec)
    237{
    238#ifdef MODULE
    239	request_codec_module(codec);
    240	if (codec_probed(codec))
    241		return;
    242#endif
    243}
    244
    245#if IS_ENABLED(CONFIG_SND_HDA_CODEC_HDMI)
    246/* if all audio out widgets are digital, let's assume the codec as a HDMI/DP */
    247static bool is_likely_hdmi_codec(struct hda_codec *codec)
    248{
    249	hda_nid_t nid;
    250
    251	for_each_hda_codec_node(nid, codec) {
    252		unsigned int wcaps = get_wcaps(codec, nid);
    253		switch (get_wcaps_type(wcaps)) {
    254		case AC_WID_AUD_IN:
    255			return false; /* HDMI parser supports only HDMI out */
    256		case AC_WID_AUD_OUT:
    257			if (!(wcaps & AC_WCAP_DIGITAL))
    258				return false;
    259			break;
    260		}
    261	}
    262	return true;
    263}
    264#else
    265/* no HDMI codec parser support */
    266#define is_likely_hdmi_codec(codec)	false
    267#endif /* CONFIG_SND_HDA_CODEC_HDMI */
    268
    269static int codec_bind_generic(struct hda_codec *codec)
    270{
    271	if (codec->probe_id)
    272		return -ENODEV;
    273
    274	if (is_likely_hdmi_codec(codec)) {
    275		codec->probe_id = HDA_CODEC_ID_GENERIC_HDMI;
    276		request_codec_module(codec);
    277		if (codec_probed(codec))
    278			return 0;
    279	}
    280
    281	codec->probe_id = HDA_CODEC_ID_GENERIC;
    282	request_codec_module(codec);
    283	if (codec_probed(codec))
    284		return 0;
    285	return -ENODEV;
    286}
    287
    288#if IS_ENABLED(CONFIG_SND_HDA_GENERIC)
    289#define is_generic_config(codec) \
    290	(codec->modelname && !strcmp(codec->modelname, "generic"))
    291#else
    292#define is_generic_config(codec)	0
    293#endif
    294
    295/**
    296 * snd_hda_codec_configure - (Re-)configure the HD-audio codec
    297 * @codec: the HDA codec
    298 *
    299 * Start parsing of the given codec tree and (re-)initialize the whole
    300 * patch instance.
    301 *
    302 * Returns 0 if successful or a negative error code.
    303 */
    304int snd_hda_codec_configure(struct hda_codec *codec)
    305{
    306	int err;
    307
    308	if (codec->configured)
    309		return 0;
    310
    311	if (is_generic_config(codec))
    312		codec->probe_id = HDA_CODEC_ID_GENERIC;
    313	else
    314		codec->probe_id = 0;
    315
    316	if (!device_is_registered(&codec->core.dev)) {
    317		err = snd_hdac_device_register(&codec->core);
    318		if (err < 0)
    319			return err;
    320	}
    321
    322	if (!codec->preset)
    323		codec_bind_module(codec);
    324	if (!codec->preset) {
    325		err = codec_bind_generic(codec);
    326		if (err < 0) {
    327			codec_dbg(codec, "Unable to bind the codec\n");
    328			return err;
    329		}
    330	}
    331
    332	codec->configured = 1;
    333	return 0;
    334}
    335EXPORT_SYMBOL_GPL(snd_hda_codec_configure);