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32 results

simple-card.c

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  • simple-card.c 17.16 KiB
    /*
     * ASoC simple sound card support
     *
     * Copyright (C) 2012 Renesas Solutions Corp.
     * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License version 2 as
     * published by the Free Software Foundation.
     */
    #include <linux/clk.h>
    #include <linux/device.h>
    #include <linux/gpio.h>
    #include <linux/module.h>
    #include <linux/of.h>
    #include <linux/of_gpio.h>
    #include <linux/platform_device.h>
    #include <linux/string.h>
    #include <sound/jack.h>
    #include <sound/simple_card.h>
    #include <sound/soc-dai.h>
    #include <sound/soc.h>
    
    struct simple_card_data {
    	struct snd_soc_card snd_card;
    	struct simple_dai_props {
    		struct asoc_simple_dai cpu_dai;
    		struct asoc_simple_dai codec_dai;
    		unsigned int mclk_fs;
    	} *dai_props;
    	unsigned int mclk_fs;
    	int gpio_hp_det;
    	int gpio_hp_det_invert;
    	int gpio_mic_det;
    	int gpio_mic_det_invert;
    	struct snd_soc_dai_link dai_link[];	/* dynamically allocated */
    };
    
    #define simple_priv_to_dev(priv) ((priv)->snd_card.dev)
    #define simple_priv_to_link(priv, i) ((priv)->snd_card.dai_link + i)
    #define simple_priv_to_props(priv, i) ((priv)->dai_props + i)
    
    static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
    {
    	struct snd_soc_pcm_runtime *rtd = substream->private_data;
    	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
    	struct simple_dai_props *dai_props =
    		&priv->dai_props[rtd->num];
    	int ret;
    
    	ret = clk_prepare_enable(dai_props->cpu_dai.clk);
    	if (ret)
    		return ret;
    	
    	ret = clk_prepare_enable(dai_props->codec_dai.clk);
    	if (ret)
    		clk_disable_unprepare(dai_props->cpu_dai.clk);
    
    	return ret;
    }
    
    static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
    {
    	struct snd_soc_pcm_runtime *rtd = substream->private_data;
    	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
    	struct simple_dai_props *dai_props =
    		&priv->dai_props[rtd->num];
    
    	clk_disable_unprepare(dai_props->cpu_dai.clk);
    
    	clk_disable_unprepare(dai_props->codec_dai.clk);
    }
    
    static int asoc_simple_card_hw_params(struct snd_pcm_substream *substream,
    				      struct snd_pcm_hw_params *params)
    {
    	struct snd_soc_pcm_runtime *rtd = substream->private_data;
    	struct snd_soc_dai *codec_dai = rtd->codec_dai;
    	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    	struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
    	struct simple_dai_props *dai_props = &priv->dai_props[rtd->num];
    	unsigned int mclk, mclk_fs = 0;
    	int ret = 0;
    
    	if (priv->mclk_fs)
    		mclk_fs = priv->mclk_fs;
    	else if (dai_props->mclk_fs)
    		mclk_fs = dai_props->mclk_fs;
    
    	if (mclk_fs) {
    		mclk = params_rate(params) * mclk_fs;
    		ret = snd_soc_dai_set_sysclk(codec_dai, 0, mclk,
    					     SND_SOC_CLOCK_IN);
    		if (ret && ret != -ENOTSUPP)
    			goto err;
    
    		ret = snd_soc_dai_set_sysclk(cpu_dai, 0, mclk,
    					     SND_SOC_CLOCK_OUT);
    		if (ret && ret != -ENOTSUPP)
    			goto err;
    	}
    	return 0;
    err:
    	return ret;
    }
    
    static struct snd_soc_ops asoc_simple_card_ops = {
    	.startup = asoc_simple_card_startup,
    	.shutdown = asoc_simple_card_shutdown,
    	.hw_params = asoc_simple_card_hw_params,
    };
    
    static struct snd_soc_jack simple_card_hp_jack;
    static struct snd_soc_jack_pin simple_card_hp_jack_pins[] = {
    	{
    		.pin = "Headphones",
    		.mask = SND_JACK_HEADPHONE,
    	},
    };
    static struct snd_soc_jack_gpio simple_card_hp_jack_gpio = {
    	.name = "Headphone detection",
    	.report = SND_JACK_HEADPHONE,
    	.debounce_time = 150,
    };
    
    static struct snd_soc_jack simple_card_mic_jack;
    static struct snd_soc_jack_pin simple_card_mic_jack_pins[] = {
    	{
    		.pin = "Mic Jack",
    		.mask = SND_JACK_MICROPHONE,
    	},
    };
    static struct snd_soc_jack_gpio simple_card_mic_jack_gpio = {
    	.name = "Mic detection",
    	.report = SND_JACK_MICROPHONE,
    	.debounce_time = 150,
    };
    
    static int __asoc_simple_card_dai_init(struct snd_soc_dai *dai,
    				       struct asoc_simple_dai *set)
    {
    	int ret;
    
    	if (set->sysclk) {
    		ret = snd_soc_dai_set_sysclk(dai, 0, set->sysclk, 0);
    		if (ret && ret != -ENOTSUPP) {
    			dev_err(dai->dev, "simple-card: set_sysclk error\n");
    			goto err;
    		}
    	}
    
    	if (set->slots) {
    		ret = snd_soc_dai_set_tdm_slot(dai,
    					       set->tx_slot_mask,
    					       set->rx_slot_mask,
    						set->slots,
    						set->slot_width);
    		if (ret && ret != -ENOTSUPP) {
    			dev_err(dai->dev, "simple-card: set_tdm_slot error\n");
    			goto err;
    		}
    	}
    
    	ret = 0;
    
    err:
    	return ret;
    }
    
    static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
    {
    	struct simple_card_data *priv =	snd_soc_card_get_drvdata(rtd->card);
    	struct snd_soc_dai *codec = rtd->codec_dai;
    	struct snd_soc_dai *cpu = rtd->cpu_dai;
    	struct simple_dai_props *dai_props;
    	int ret;
    
    	dai_props = &priv->dai_props[rtd->num];
    	ret = __asoc_simple_card_dai_init(codec, &dai_props->codec_dai);
    	if (ret < 0)
    		return ret;
    
    	ret = __asoc_simple_card_dai_init(cpu, &dai_props->cpu_dai);
    	if (ret < 0)
    		return ret;
    
    	if (gpio_is_valid(priv->gpio_hp_det)) {
    		snd_soc_card_jack_new(rtd->card, "Headphones",
    				      SND_JACK_HEADPHONE,
    				      &simple_card_hp_jack,
    				      simple_card_hp_jack_pins,
    				      ARRAY_SIZE(simple_card_hp_jack_pins));
    
    		simple_card_hp_jack_gpio.gpio = priv->gpio_hp_det;
    		simple_card_hp_jack_gpio.invert = priv->gpio_hp_det_invert;
    		snd_soc_jack_add_gpios(&simple_card_hp_jack, 1,
    				       &simple_card_hp_jack_gpio);
    	}
    
    	if (gpio_is_valid(priv->gpio_mic_det)) {
    		snd_soc_card_jack_new(rtd->card, "Mic Jack",
    				      SND_JACK_MICROPHONE,
    				      &simple_card_mic_jack,
    				      simple_card_mic_jack_pins,
    				      ARRAY_SIZE(simple_card_mic_jack_pins));
    		simple_card_mic_jack_gpio.gpio = priv->gpio_mic_det;
    		simple_card_mic_jack_gpio.invert = priv->gpio_mic_det_invert;
    		snd_soc_jack_add_gpios(&simple_card_mic_jack, 1,
    				       &simple_card_mic_jack_gpio);
    	}
    	return 0;
    }
    
    static int
    asoc_simple_card_sub_parse_of(struct device_node *np,
    			      struct asoc_simple_dai *dai,
    			      struct device_node **p_node,
    			      const char **name,
    			      int *args_count)
    {
    	struct of_phandle_args args;
    	struct clk *clk;
    	u32 val;
    	int ret;
    
    	/*
    	 * Get node via "sound-dai = <&phandle port>"
    	 * it will be used as xxx_of_node on soc_bind_dai_link()
    	 */
    	ret = of_parse_phandle_with_args(np, "sound-dai",
    					 "#sound-dai-cells", 0, &args);
    	if (ret)
    		return ret;
    
    	*p_node = args.np;
    
    	if (args_count)
    		*args_count = args.args_count;
    
    	/* Get dai->name */
    	ret = snd_soc_of_get_dai_name(np, name);
    	if (ret < 0)
    		return ret;
    
    	/* Parse TDM slot */
    	ret = snd_soc_of_parse_tdm_slot(np, &dai->tx_slot_mask,
    					&dai->rx_slot_mask,
    					&dai->slots, &dai->slot_width);
    	if (ret)
    		return ret;
    
    	/*
    	 * Parse dai->sysclk come from "clocks = <&xxx>"
    	 * (if system has common clock)
    	 *  or "system-clock-frequency = <xxx>"
    	 *  or device's module clock.
    	 */
    	if (of_property_read_bool(np, "clocks")) {
    		clk = of_clk_get(np, 0);
    		if (IS_ERR(clk)) {
    			ret = PTR_ERR(clk);
    			return ret;
    		}
    
    		dai->sysclk = clk_get_rate(clk);
    		dai->clk = clk;
    	} else if (!of_property_read_u32(np, "system-clock-frequency", &val)) {
    		dai->sysclk = val;
    	} else {
    		clk = of_clk_get(args.np, 0);
    		if (!IS_ERR(clk))
    			dai->sysclk = clk_get_rate(clk);
    	}
    
    	return 0;
    }
    
    static int asoc_simple_card_parse_daifmt(struct device_node *node,
    					 struct simple_card_data *priv,
    					 struct device_node *codec,
    					 char *prefix, int idx)
    {
    	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, idx);
    	struct device *dev = simple_priv_to_dev(priv);
    	struct device_node *bitclkmaster = NULL;
    	struct device_node *framemaster = NULL;
    	unsigned int daifmt;
    
    	daifmt = snd_soc_of_parse_daifmt(node, prefix,
    					 &bitclkmaster, &framemaster);
    	daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
    
    	if (strlen(prefix) && !bitclkmaster && !framemaster) {
    		/*
    		 * No dai-link level and master setting was not found from
    		 * sound node level, revert back to legacy DT parsing and
    		 * take the settings from codec node.
    		 */
    		dev_dbg(dev, "Revert to legacy daifmt parsing\n");
    
    		daifmt = snd_soc_of_parse_daifmt(codec, NULL, NULL, NULL) |
    			(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);
    	} else {
    		if (codec == bitclkmaster)
    			daifmt |= (codec == framemaster) ?
    				SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
    		else
    			daifmt |= (codec == framemaster) ?
    				SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
    	}
    
    	dai_link->dai_fmt = daifmt;
    
    	of_node_put(bitclkmaster);
    	of_node_put(framemaster);
    
    	return 0;
    }
    
    static int asoc_simple_card_dai_link_of(struct device_node *node,
    					struct simple_card_data *priv,
    					int idx,
    					bool is_top_level_node)
    {
    	struct device *dev = simple_priv_to_dev(priv);
    	struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, idx);
    	struct simple_dai_props *dai_props = simple_priv_to_props(priv, idx);
    	struct device_node *cpu = NULL;
    	struct device_node *plat = NULL;
    	struct device_node *codec = NULL;
    	char *name;
    	char prop[128];
    	char *prefix = "";
    	int ret, cpu_args;
    	u32 val;
    
    	/* For single DAI link & old style of DT node */
    	if (is_top_level_node)
    		prefix = "simple-audio-card,";
    
    	snprintf(prop, sizeof(prop), "%scpu", prefix);
    	cpu = of_get_child_by_name(node, prop);
    
    	snprintf(prop, sizeof(prop), "%splat", prefix);
    	plat = of_get_child_by_name(node, prop);
    
    	snprintf(prop, sizeof(prop), "%scodec", prefix);
    	codec = of_get_child_by_name(node, prop);
    
    	if (!cpu || !codec) {
    		ret = -EINVAL;
    		dev_err(dev, "%s: Can't find %s DT node\n", __func__, prop);
    		goto dai_link_of_err;
    	}
    
    	ret = asoc_simple_card_parse_daifmt(node, priv,
    					    codec, prefix, idx);
    	if (ret < 0)
    		goto dai_link_of_err;
    
    	if (!of_property_read_u32(node, "mclk-fs", &val))
    		dai_props->mclk_fs = val;
    
    	ret = asoc_simple_card_sub_parse_of(cpu, &dai_props->cpu_dai,
    					    &dai_link->cpu_of_node,
    					    &dai_link->cpu_dai_name,
    					    &cpu_args);
    	if (ret < 0)
    		goto dai_link_of_err;
    
    	ret = asoc_simple_card_sub_parse_of(codec, &dai_props->codec_dai,
    					    &dai_link->codec_of_node,
    					    &dai_link->codec_dai_name, NULL);
    	if (ret < 0)
    		goto dai_link_of_err;
    
    	if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name) {
    		ret = -EINVAL;
    		goto dai_link_of_err;
    	}
    
    	if (plat) {
    		struct of_phandle_args args;
    
    		ret = of_parse_phandle_with_args(plat, "sound-dai",
    						 "#sound-dai-cells", 0, &args);
    		dai_link->platform_of_node = args.np;
    	} else {
    		/* Assumes platform == cpu */
    		dai_link->platform_of_node = dai_link->cpu_of_node;
    	}
    
    	/* DAI link name is created from CPU/CODEC dai name */
    	name = devm_kzalloc(dev,
    			    strlen(dai_link->cpu_dai_name)   +
    			    strlen(dai_link->codec_dai_name) + 2,
    			    GFP_KERNEL);
    	if (!name) {
    		ret = -ENOMEM;
    		goto dai_link_of_err;
    	}
    
    	sprintf(name, "%s-%s", dai_link->cpu_dai_name,
    				dai_link->codec_dai_name);
    	dai_link->name = dai_link->stream_name = name;
    	dai_link->ops = &asoc_simple_card_ops;
    	dai_link->init = asoc_simple_card_dai_init;
    
    	dev_dbg(dev, "\tname : %s\n", dai_link->stream_name);
    	dev_dbg(dev, "\tformat : %04x\n", dai_link->dai_fmt);
    	dev_dbg(dev, "\tcpu : %s / %d\n",
    		dai_link->cpu_dai_name,
    		dai_props->cpu_dai.sysclk);
    	dev_dbg(dev, "\tcodec : %s / %d\n",
    		dai_link->codec_dai_name,
    		dai_props->codec_dai.sysclk);
    
    	/*
    	 * In soc_bind_dai_link() will check cpu name after
    	 * of_node matching if dai_link has cpu_dai_name.
    	 * but, it will never match if name was created by
    	 * fmt_single_name() remove cpu_dai_name if cpu_args
    	 * was 0. See:
    	 *	fmt_single_name()
    	 *	fmt_multiple_name()
    	 */
    	if (!cpu_args)
    		dai_link->cpu_dai_name = NULL;
    
    dai_link_of_err:
    	of_node_put(cpu);
    	of_node_put(codec);
    
    	return ret;
    }
    
    static int asoc_simple_card_parse_of(struct device_node *node,
    				     struct simple_card_data *priv)
    {
    	struct device *dev = simple_priv_to_dev(priv);
    	enum of_gpio_flags flags;
    	u32 val;
    	int ret;
    
    	if (!node)
    		return -EINVAL;
    
    	/* Parse the card name from DT */
    	snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");
    
    	/* The off-codec widgets */
    	if (of_property_read_bool(node, "simple-audio-card,widgets")) {
    		ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,
    					"simple-audio-card,widgets");
    		if (ret)
    			return ret;
    	}
    
    	/* DAPM routes */
    	if (of_property_read_bool(node, "simple-audio-card,routing")) {
    		ret = snd_soc_of_parse_audio_routing(&priv->snd_card,
    					"simple-audio-card,routing");
    		if (ret)
    			return ret;
    	}
    
    	/* Factor to mclk, used in hw_params() */
    	ret = of_property_read_u32(node, "simple-audio-card,mclk-fs", &val);
    	if (ret == 0)
    		priv->mclk_fs = val;
    
    	dev_dbg(dev, "New simple-card: %s\n", priv->snd_card.name ?
    		priv->snd_card.name : "");
    
    	/* Single/Muti DAI link(s) & New style of DT node */
    	if (of_get_child_by_name(node, "simple-audio-card,dai-link")) {
    		struct device_node *np = NULL;
    		int i = 0;
    
    		for_each_child_of_node(node, np) {
    			dev_dbg(dev, "\tlink %d:\n", i);
    			ret = asoc_simple_card_dai_link_of(np, priv,
    							   i, false);
    			if (ret < 0) {
    				of_node_put(np);
    				return ret;
    			}
    			i++;
    		}
    	} else {
    		/* For single DAI link & old style of DT node */
    		ret = asoc_simple_card_dai_link_of(node, priv, 0, true);
    		if (ret < 0)
    			return ret;
    	}
    
    	priv->gpio_hp_det = of_get_named_gpio_flags(node,
    				"simple-audio-card,hp-det-gpio", 0, &flags);
    	priv->gpio_hp_det_invert = !!(flags & OF_GPIO_ACTIVE_LOW);
    	if (priv->gpio_hp_det == -EPROBE_DEFER)
    		return -EPROBE_DEFER;
    
    	priv->gpio_mic_det = of_get_named_gpio_flags(node,
    				"simple-audio-card,mic-det-gpio", 0, &flags);
    	priv->gpio_mic_det_invert = !!(flags & OF_GPIO_ACTIVE_LOW);
    	if (priv->gpio_mic_det == -EPROBE_DEFER)
    		return -EPROBE_DEFER;
    
    	if (!priv->snd_card.name)
    		priv->snd_card.name = priv->snd_card.dai_link->name;
    
    	return 0;
    }
    
    /* Decrease the reference count of the device nodes */
    static int asoc_simple_card_unref(struct snd_soc_card *card)
    {
    	struct snd_soc_dai_link *dai_link;
    	int num_links;
    
    	for (num_links = 0, dai_link = card->dai_link;
    	     num_links < card->num_links;
    	     num_links++, dai_link++) {
    		of_node_put(dai_link->cpu_of_node);
    		of_node_put(dai_link->codec_of_node);
    	}
    	return 0;
    }
    
    static int asoc_simple_card_probe(struct platform_device *pdev)
    {
    	struct simple_card_data *priv;
    	struct snd_soc_dai_link *dai_link;
    	struct device_node *np = pdev->dev.of_node;
    	struct device *dev = &pdev->dev;
    	int num_links, ret;
    
    	/* Get the number of DAI links */
    	if (np && of_get_child_by_name(np, "simple-audio-card,dai-link"))
    		num_links = of_get_child_count(np);
    	else
    		num_links = 1;
    
    	/* Allocate the private data and the DAI link array */
    	priv = devm_kzalloc(dev,
    			sizeof(*priv) + sizeof(*dai_link) * num_links,
    			GFP_KERNEL);
    	if (!priv)
    		return -ENOMEM;
    
    	/* Init snd_soc_card */
    	priv->snd_card.owner = THIS_MODULE;
    	priv->snd_card.dev = dev;
    	dai_link = priv->dai_link;
    	priv->snd_card.dai_link = dai_link;
    	priv->snd_card.num_links = num_links;
    
    	priv->gpio_hp_det = -ENOENT;
    	priv->gpio_mic_det = -ENOENT;
    
    	/* Get room for the other properties */
    	priv->dai_props = devm_kzalloc(dev,
    			sizeof(*priv->dai_props) * num_links,
    			GFP_KERNEL);
    	if (!priv->dai_props)
    		return -ENOMEM;
    
    	if (np && of_device_is_available(np)) {
    
    		ret = asoc_simple_card_parse_of(np, priv);
    		if (ret < 0) {
    			if (ret != -EPROBE_DEFER)
    				dev_err(dev, "parse error %d\n", ret);
    			goto err;
    		}
    
    	} else {
    		struct asoc_simple_card_info *cinfo;
    
    		cinfo = dev->platform_data;
    		if (!cinfo) {
    			dev_err(dev, "no info for asoc-simple-card\n");
    			return -EINVAL;
    		}
    
    		if (!cinfo->name ||
    		    !cinfo->codec_dai.name ||
    		    !cinfo->codec ||
    		    !cinfo->platform ||
    		    !cinfo->cpu_dai.name) {
    			dev_err(dev, "insufficient asoc_simple_card_info settings\n");
    			return -EINVAL;
    		}
    
    		priv->snd_card.name	= (cinfo->card) ? cinfo->card : cinfo->name;
    		dai_link->name		= cinfo->name;
    		dai_link->stream_name	= cinfo->name;
    		dai_link->platform_name	= cinfo->platform;
    		dai_link->codec_name	= cinfo->codec;
    		dai_link->cpu_dai_name	= cinfo->cpu_dai.name;
    		dai_link->codec_dai_name = cinfo->codec_dai.name;
    		dai_link->dai_fmt	= cinfo->daifmt;
    		dai_link->init		= asoc_simple_card_dai_init;
    		memcpy(&priv->dai_props->cpu_dai, &cinfo->cpu_dai,
    					sizeof(priv->dai_props->cpu_dai));
    		memcpy(&priv->dai_props->codec_dai, &cinfo->codec_dai,
    					sizeof(priv->dai_props->codec_dai));
    
    	}
    
    	snd_soc_card_set_drvdata(&priv->snd_card, priv);
    
    	ret = devm_snd_soc_register_card(&pdev->dev, &priv->snd_card);
    	if (ret >= 0)
    		return ret;
    
    err:
    	asoc_simple_card_unref(&priv->snd_card);
    	return ret;
    }
    
    static int asoc_simple_card_remove(struct platform_device *pdev)
    {
    	struct snd_soc_card *card = platform_get_drvdata(pdev);
    	struct simple_card_data *priv = snd_soc_card_get_drvdata(card);
    
    	if (gpio_is_valid(priv->gpio_hp_det))
    		snd_soc_jack_free_gpios(&simple_card_hp_jack, 1,
    					&simple_card_hp_jack_gpio);
    	if (gpio_is_valid(priv->gpio_mic_det))
    		snd_soc_jack_free_gpios(&simple_card_mic_jack, 1,
    					&simple_card_mic_jack_gpio);
    
    	return asoc_simple_card_unref(card);
    }
    
    static const struct of_device_id asoc_simple_of_match[] = {
    	{ .compatible = "simple-audio-card", },
    	{},
    };
    MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
    
    static struct platform_driver asoc_simple_card = {
    	.driver = {
    		.name = "asoc-simple-card",
    		.of_match_table = asoc_simple_of_match,
    	},
    	.probe = asoc_simple_card_probe,
    	.remove = asoc_simple_card_remove,
    };
    
    module_platform_driver(asoc_simple_card);
    
    MODULE_ALIAS("platform:asoc-simple-card");
    MODULE_LICENSE("GPL");
    MODULE_DESCRIPTION("ASoC Simple Sound Card");
    MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");