blob: 7eb027238327839c99bf0ffc82e76adadaaff74f [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
//
// ASoC audio graph sound card support
//
// Copyright (C) 2016 Renesas Solutions Corp.
// Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
//
// based on ${LINUX}/sound/soc/generic/simple-card.c
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <sound/graph_card.h>
#define DPCM_SELECTABLE 1
static int graph_outdrv_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol,
int event)
{
struct snd_soc_dapm_context *dapm = w->dapm;
struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(dapm->card);
switch (event) {
case SND_SOC_DAPM_POST_PMU:
gpiod_set_value_cansleep(priv->pa_gpio, 1);
break;
case SND_SOC_DAPM_PRE_PMD:
gpiod_set_value_cansleep(priv->pa_gpio, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct snd_soc_dapm_widget graph_dapm_widgets[] = {
SND_SOC_DAPM_OUT_DRV_E("Amplifier", SND_SOC_NOPM,
0, 0, NULL, 0, graph_outdrv_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
};
static const struct snd_soc_ops graph_ops = {
.startup = asoc_simple_startup,
.shutdown = asoc_simple_shutdown,
.hw_params = asoc_simple_hw_params,
};
static int graph_get_dai_id(struct device_node *ep)
{
struct device_node *node;
struct device_node *endpoint;
struct of_endpoint info;
int i, id;
const u32 *reg;
int ret;
/* use driver specified DAI ID if exist */
ret = snd_soc_get_dai_id(ep);
if (ret != -ENOTSUPP)
return ret;
/* use endpoint/port reg if exist */
ret = of_graph_parse_endpoint(ep, &info);
if (ret == 0) {
/*
* Because it will count port/endpoint if it doesn't have "reg".
* But, we can't judge whether it has "no reg", or "reg = <0>"
* only of_graph_parse_endpoint().
* We need to check "reg" property
*/
if (of_get_property(ep, "reg", NULL))
return info.id;
node = of_get_parent(ep);
reg = of_get_property(node, "reg", NULL);
of_node_put(node);
if (reg)
return info.port;
}
node = of_graph_get_port_parent(ep);
/*
* Non HDMI sound case, counting port/endpoint on its DT
* is enough. Let's count it.
*/
i = 0;
id = -1;
for_each_endpoint_of_node(node, endpoint) {
if (endpoint == ep)
id = i;
i++;
}
of_node_put(node);
if (id < 0)
return -ENODEV;
return id;
}
static bool soc_component_is_pcm(struct snd_soc_dai_link_component *dlc)
{
struct snd_soc_dai *dai = snd_soc_find_dai_with_mutex(dlc);
if (dai && (dai->component->driver->pcm_construct ||
dai->driver->pcm_new))
return true;
return false;
}
static int asoc_simple_parse_dai(struct device_node *ep,
struct snd_soc_dai_link_component *dlc,
int *is_single_link)
{
struct device_node *node;
struct of_phandle_args args;
int ret;
if (!ep)
return 0;
node = of_graph_get_port_parent(ep);
/* Get dai->name */
args.np = node;
args.args[0] = graph_get_dai_id(ep);
args.args_count = (of_graph_get_endpoint_count(node) > 1);
/*
* FIXME
*
* Here, dlc->dai_name is pointer to CPU/Codec DAI name.
* If user unbinded CPU or Codec driver, but not for Sound Card,
* dlc->dai_name is keeping unbinded CPU or Codec
* driver's pointer.
*
* If user re-bind CPU or Codec driver again, ALSA SoC will try
* to rebind Card via snd_soc_try_rebind_card(), but because of
* above reason, it might can't bind Sound Card.
* Because Sound Card is pointing to released dai_name pointer.
*
* To avoid this rebind Card issue,
* 1) It needs to alloc memory to keep dai_name eventhough
* CPU or Codec driver was unbinded, or
* 2) user need to rebind Sound Card everytime
* if he unbinded CPU or Codec.
*/
ret = snd_soc_get_dai_name(&args, &dlc->dai_name);
if (ret < 0)
return ret;
dlc->of_node = node;
if (is_single_link)
*is_single_link = of_graph_get_endpoint_count(node) == 1;
return 0;
}
static void graph_parse_convert(struct device *dev,
struct device_node *ep,
struct asoc_simple_data *adata)
{
struct device_node *top = dev->of_node;
struct device_node *port = of_get_parent(ep);
struct device_node *ports = of_get_parent(port);
struct device_node *node = of_graph_get_port_parent(ep);
asoc_simple_parse_convert(top, NULL, adata);
if (of_node_name_eq(ports, "ports"))
asoc_simple_parse_convert(ports, NULL, adata);
asoc_simple_parse_convert(port, NULL, adata);
asoc_simple_parse_convert(ep, NULL, adata);
of_node_put(port);
of_node_put(ports);
of_node_put(node);
}
static void graph_parse_mclk_fs(struct device_node *top,
struct device_node *ep,
struct simple_dai_props *props)
{
struct device_node *port = of_get_parent(ep);
struct device_node *ports = of_get_parent(port);
of_property_read_u32(top, "mclk-fs", &props->mclk_fs);
if (of_node_name_eq(ports, "ports"))
of_property_read_u32(ports, "mclk-fs", &props->mclk_fs);
of_property_read_u32(port, "mclk-fs", &props->mclk_fs);
of_property_read_u32(ep, "mclk-fs", &props->mclk_fs);
of_node_put(port);
of_node_put(ports);
}
static int graph_parse_node(struct asoc_simple_priv *priv,
struct device_node *ep,
struct link_info *li,
int *cpu)
{
struct device *dev = simple_priv_to_dev(priv);
struct device_node *top = dev->of_node;
struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
struct snd_soc_dai_link_component *dlc;
struct asoc_simple_dai *dai;
int ret;
if (cpu) {
dlc = asoc_link_to_cpu(dai_link, 0);
dai = simple_props_to_dai_cpu(dai_props, 0);
} else {
dlc = asoc_link_to_codec(dai_link, 0);
dai = simple_props_to_dai_codec(dai_props, 0);
}
graph_parse_mclk_fs(top, ep, dai_props);
ret = asoc_simple_parse_dai(ep, dlc, cpu);
if (ret < 0)
return ret;
ret = asoc_simple_parse_tdm(ep, dai);
if (ret < 0)
return ret;
ret = asoc_simple_parse_clk(dev, ep, dai, dlc);
if (ret < 0)
return ret;
return 0;
}
static int graph_link_init(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li,
char *name)
{
struct device *dev = simple_priv_to_dev(priv);
struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
int ret;
ret = asoc_simple_parse_daifmt(dev, cpu_ep, codec_ep,
NULL, &dai_link->dai_fmt);
if (ret < 0)
return ret;
dai_link->init = asoc_simple_dai_init;
dai_link->ops = &graph_ops;
if (priv->ops)
dai_link->ops = priv->ops;
return asoc_simple_set_dailink_name(dev, dai_link, name);
}
static int graph_dai_link_of_dpcm(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li)
{
struct device *dev = simple_priv_to_dev(priv);
struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
struct simple_dai_props *dai_props = simple_priv_to_props(priv, li->link);
struct device_node *top = dev->of_node;
struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
char dai_name[64];
int ret;
dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);
if (li->cpu) {
struct snd_soc_card *card = simple_priv_to_card(priv);
struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
int is_single_links = 0;
/* Codec is dummy */
/* FE settings */
dai_link->dynamic = 1;
dai_link->dpcm_merged_format = 1;
ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
if (ret)
return ret;
snprintf(dai_name, sizeof(dai_name),
"fe.%pOFP.%s", cpus->of_node, cpus->dai_name);
/*
* In BE<->BE connections it is not required to create
* PCM devices at CPU end of the dai link and thus 'no_pcm'
* flag needs to be set. It is useful when there are many
* BE components and some of these have to be connected to
* form a valid audio path.
*
* For example: FE <-> BE1 <-> BE2 <-> ... <-> BEn where
* there are 'n' BE components in the path.
*/
if (card->component_chaining && !soc_component_is_pcm(cpus)) {
dai_link->no_pcm = 1;
dai_link->be_hw_params_fixup = asoc_simple_be_hw_params_fixup;
}
asoc_simple_canonicalize_cpu(cpus, is_single_links);
asoc_simple_canonicalize_platform(platforms, cpus);
} else {
struct snd_soc_codec_conf *cconf = simple_props_to_codec_conf(dai_props, 0);
struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
struct device_node *port;
struct device_node *ports;
/* CPU is dummy */
/* BE settings */
dai_link->no_pcm = 1;
dai_link->be_hw_params_fixup = asoc_simple_be_hw_params_fixup;
ret = graph_parse_node(priv, codec_ep, li, NULL);
if (ret < 0)
return ret;
snprintf(dai_name, sizeof(dai_name),
"be.%pOFP.%s", codecs->of_node, codecs->dai_name);
/* check "prefix" from top node */
port = of_get_parent(ep);
ports = of_get_parent(port);
snd_soc_of_parse_node_prefix(top, cconf, codecs->of_node,
"prefix");
if (of_node_name_eq(ports, "ports"))
snd_soc_of_parse_node_prefix(ports, cconf, codecs->of_node, "prefix");
snd_soc_of_parse_node_prefix(port, cconf, codecs->of_node,
"prefix");
of_node_put(ports);
of_node_put(port);
}
graph_parse_convert(dev, ep, &dai_props->adata);
snd_soc_dai_link_set_capabilities(dai_link);
ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
li->link++;
return ret;
}
static int graph_dai_link_of(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li)
{
struct device *dev = simple_priv_to_dev(priv);
struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, li->link);
struct snd_soc_dai_link_component *cpus = asoc_link_to_cpu(dai_link, 0);
struct snd_soc_dai_link_component *codecs = asoc_link_to_codec(dai_link, 0);
struct snd_soc_dai_link_component *platforms = asoc_link_to_platform(dai_link, 0);
char dai_name[64];
int ret, is_single_links = 0;
dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);
ret = graph_parse_node(priv, cpu_ep, li, &is_single_links);
if (ret < 0)
return ret;
ret = graph_parse_node(priv, codec_ep, li, NULL);
if (ret < 0)
return ret;
snprintf(dai_name, sizeof(dai_name),
"%s-%s", cpus->dai_name, codecs->dai_name);
asoc_simple_canonicalize_cpu(cpus, is_single_links);
asoc_simple_canonicalize_platform(platforms, cpus);
ret = graph_link_init(priv, cpu_ep, codec_ep, li, dai_name);
if (ret < 0)
return ret;
li->link++;
return 0;
}
static inline bool parse_as_dpcm_link(struct asoc_simple_priv *priv,
struct device_node *codec_port,
struct asoc_simple_data *adata)
{
if (priv->force_dpcm)
return true;
if (!priv->dpcm_selectable)
return false;
/*
* It is DPCM
* if Codec port has many endpoints,
* or has convert-xxx property
*/
if ((of_get_child_count(codec_port) > 1) ||
(adata->convert_rate || adata->convert_channels))
return true;
return false;
}
static int __graph_for_each_link(struct asoc_simple_priv *priv,
struct link_info *li,
int (*func_noml)(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li),
int (*func_dpcm)(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li))
{
struct of_phandle_iterator it;
struct device *dev = simple_priv_to_dev(priv);
struct device_node *node = dev->of_node;
struct device_node *cpu_port;
struct device_node *cpu_ep;
struct device_node *codec_ep;
struct device_node *codec_port;
struct device_node *codec_port_old = NULL;
struct asoc_simple_data adata;
int rc, ret = 0;
/* loop for all listed CPU port */
of_for_each_phandle(&it, rc, node, "dais", NULL, 0) {
cpu_port = it.node;
cpu_ep = NULL;
/* loop for all CPU endpoint */
while (1) {
cpu_ep = of_get_next_child(cpu_port, cpu_ep);
if (!cpu_ep)
break;
/* get codec */
codec_ep = of_graph_get_remote_endpoint(cpu_ep);
codec_port = of_get_parent(codec_ep);
/* get convert-xxx property */
memset(&adata, 0, sizeof(adata));
graph_parse_convert(dev, codec_ep, &adata);
graph_parse_convert(dev, cpu_ep, &adata);
/* check if link requires DPCM parsing */
if (parse_as_dpcm_link(priv, codec_port, &adata)) {
/*
* Codec endpoint can be NULL for pluggable audio HW.
* Platform DT can populate the Codec endpoint depending on the
* plugged HW.
*/
/* Do it all CPU endpoint, and 1st Codec endpoint */
if (li->cpu ||
((codec_port_old != codec_port) && codec_ep))
ret = func_dpcm(priv, cpu_ep, codec_ep, li);
/* else normal sound */
} else {
if (li->cpu)
ret = func_noml(priv, cpu_ep, codec_ep, li);
}
of_node_put(codec_ep);
of_node_put(codec_port);
if (ret < 0)
return ret;
codec_port_old = codec_port;
}
}
return 0;
}
static int graph_for_each_link(struct asoc_simple_priv *priv,
struct link_info *li,
int (*func_noml)(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li),
int (*func_dpcm)(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li))
{
int ret;
/*
* Detect all CPU first, and Detect all Codec 2nd.
*
* In Normal sound case, all DAIs are detected
* as "CPU-Codec".
*
* In DPCM sound case,
* all CPUs are detected as "CPU-dummy", and
* all Codecs are detected as "dummy-Codec".
* To avoid random sub-device numbering,
* detect "dummy-Codec" in last;
*/
for (li->cpu = 1; li->cpu >= 0; li->cpu--) {
ret = __graph_for_each_link(priv, li, func_noml, func_dpcm);
if (ret < 0)
break;
}
return ret;
}
static int graph_get_dais_count(struct asoc_simple_priv *priv,
struct link_info *li);
int audio_graph_parse_of(struct asoc_simple_priv *priv, struct device *dev)
{
struct snd_soc_card *card = simple_priv_to_card(priv);
struct link_info *li;
int ret;
li = devm_kzalloc(dev, sizeof(*li), GFP_KERNEL);
if (!li)
return -ENOMEM;
card->owner = THIS_MODULE;
card->dev = dev;
ret = graph_get_dais_count(priv, li);
if (ret < 0)
return ret;
if (!li->link)
return -EINVAL;
ret = asoc_simple_init_priv(priv, li);
if (ret < 0)
return ret;
priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
if (IS_ERR(priv->pa_gpio)) {
ret = PTR_ERR(priv->pa_gpio);
dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
return ret;
}
ret = asoc_simple_parse_widgets(card, NULL);
if (ret < 0)
return ret;
ret = asoc_simple_parse_routing(card, NULL);
if (ret < 0)
return ret;
memset(li, 0, sizeof(*li));
ret = graph_for_each_link(priv, li,
graph_dai_link_of,
graph_dai_link_of_dpcm);
if (ret < 0)
goto err;
ret = asoc_simple_parse_card_name(card, NULL);
if (ret < 0)
goto err;
snd_soc_card_set_drvdata(card, priv);
asoc_simple_debug_info(priv);
ret = devm_snd_soc_register_card(dev, card);
if (ret < 0)
goto err;
devm_kfree(dev, li);
return 0;
err:
asoc_simple_clean_reference(card);
if (ret != -EPROBE_DEFER)
dev_err(dev, "parse error %d\n", ret);
return ret;
}
EXPORT_SYMBOL_GPL(audio_graph_parse_of);
static int graph_count_noml(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li)
{
struct device *dev = simple_priv_to_dev(priv);
if (li->link >= SNDRV_MAX_LINKS) {
dev_err(dev, "too many links\n");
return -EINVAL;
}
li->num[li->link].cpus = 1;
li->num[li->link].codecs = 1;
li->num[li->link].platforms = 1;
li->link += 1; /* 1xCPU-Codec */
dev_dbg(dev, "Count As Normal\n");
return 0;
}
static int graph_count_dpcm(struct asoc_simple_priv *priv,
struct device_node *cpu_ep,
struct device_node *codec_ep,
struct link_info *li)
{
struct device *dev = simple_priv_to_dev(priv);
if (li->link >= SNDRV_MAX_LINKS) {
dev_err(dev, "too many links\n");
return -EINVAL;
}
if (li->cpu) {
li->num[li->link].cpus = 1;
li->num[li->link].platforms = 1;
li->link++; /* 1xCPU-dummy */
} else {
li->num[li->link].codecs = 1;
li->link++; /* 1xdummy-Codec */
}
dev_dbg(dev, "Count As DPCM\n");
return 0;
}
static int graph_get_dais_count(struct asoc_simple_priv *priv,
struct link_info *li)
{
/*
* link_num : number of links.
* CPU-Codec / CPU-dummy / dummy-Codec
* dais_num : number of DAIs
* ccnf_num : number of codec_conf
* same number for "dummy-Codec"
*
* ex1)
* CPU0 --- Codec0 link : 5
* CPU1 --- Codec1 dais : 7
* CPU2 -/ ccnf : 1
* CPU3 --- Codec2
*
* => 5 links = 2xCPU-Codec + 2xCPU-dummy + 1xdummy-Codec
* => 7 DAIs = 4xCPU + 3xCodec
* => 1 ccnf = 1xdummy-Codec
*
* ex2)
* CPU0 --- Codec0 link : 5
* CPU1 --- Codec1 dais : 6
* CPU2 -/ ccnf : 1
* CPU3 -/
*
* => 5 links = 1xCPU-Codec + 3xCPU-dummy + 1xdummy-Codec
* => 6 DAIs = 4xCPU + 2xCodec
* => 1 ccnf = 1xdummy-Codec
*
* ex3)
* CPU0 --- Codec0 link : 6
* CPU1 -/ dais : 6
* CPU2 --- Codec1 ccnf : 2
* CPU3 -/
*
* => 6 links = 0xCPU-Codec + 4xCPU-dummy + 2xdummy-Codec
* => 6 DAIs = 4xCPU + 2xCodec
* => 2 ccnf = 2xdummy-Codec
*
* ex4)
* CPU0 --- Codec0 (convert-rate) link : 3
* CPU1 --- Codec1 dais : 4
* ccnf : 1
*
* => 3 links = 1xCPU-Codec + 1xCPU-dummy + 1xdummy-Codec
* => 4 DAIs = 2xCPU + 2xCodec
* => 1 ccnf = 1xdummy-Codec
*/
return graph_for_each_link(priv, li,
graph_count_noml,
graph_count_dpcm);
}
static int graph_probe(struct platform_device *pdev)
{
struct asoc_simple_priv *priv;
struct device *dev = &pdev->dev;
struct snd_soc_card *card;
/* Allocate the private data and the DAI link array */
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
card = simple_priv_to_card(priv);
card->dapm_widgets = graph_dapm_widgets;
card->num_dapm_widgets = ARRAY_SIZE(graph_dapm_widgets);
card->probe = asoc_graph_card_probe;
if (of_device_get_match_data(dev))
priv->dpcm_selectable = 1;
return audio_graph_parse_of(priv, dev);
}
static const struct of_device_id graph_of_match[] = {
{ .compatible = "audio-graph-card", },
{ .compatible = "audio-graph-scu-card",
.data = (void *)DPCM_SELECTABLE },
{},
};
MODULE_DEVICE_TABLE(of, graph_of_match);
static struct platform_driver graph_card = {
.driver = {
.name = "asoc-audio-graph-card",
.pm = &snd_soc_pm_ops,
.of_match_table = graph_of_match,
},
.probe = graph_probe,
.remove = asoc_simple_remove,
};
module_platform_driver(graph_card);
MODULE_ALIAS("platform:asoc-audio-graph-card");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ASoC Audio Graph Sound Card");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");