MLK-24930-1: sound: soc: fsl: imx pcm512x: iqaudio dac

ASoC machine sound driver for IQAudio PiDAC plus/pro
Rev3 for iMX SoC, high resolution codec supporting
upto 384khz sample rate on SAI; Include support for
Hifiberry audio hats that uses external oscillators for
dac system clock.

Signed-off-by: Adrian Alonso <adrian.alonso@nxp.com>
Reviewed-by: Shengjiu Wang <shengjiu.wang@nxp.com>
(cherry picked from commit b52d3587cba2b3db60cf316430478969918fed7a)

sound/soc/fsl/Kconfig

@@ -604,6 +604,18 @@ config SND_SOC_IMX_XCVR
 	  Say Y if you want to add support for SoC audio on an i.MX board with
 	  an Audio Transceiver (XCVR).
 
+config SND_SOC_IMX_PCM512X
+	tristate "SoC Audio support for i.MX boards with PCM512x"
+	depends on OF && I2C
+	select SND_SOC_PCM512x_I2C
+	select SND_SOC_IMX_PCM_DMA
+	select SND_SOC_FSL_SAI
+	select SND_SOC_FSL_UTILS
+	help
+	  SoC Audio support for i.MX boards with pcm512x
+	  Say Y if you want to add support for SoC audio on an i.MX board with
+	  an pcm512x codec.
+
 endif # SND_IMX_SOC
 
 endmenu

sound/soc/fsl/Makefile

@@ -106,6 +106,7 @@ snd-soc-imx-hdmi-objs := imx-hdmi.o
 snd-soc-imx-cdnhdmi-objs := imx-cdnhdmi.o
 snd-soc-imx-rpmsg-objs := imx-rpmsg.o
 snd-soc-imx-xcvr-objs := imx-xcvr.o
+snd-soc-imx-pcm512x-objs := imx-pcm512x.o
 
 obj-$(CONFIG_SND_SOC_EUKREA_TLV320) += snd-soc-eukrea-tlv320.o
 obj-$(CONFIG_SND_SOC_PHYCORE_AC97) += snd-soc-phycore-ac97.o
@@ -134,5 +135,6 @@ obj-$(CONFIG_SND_SOC_IMX_SI476X) += snd-soc-imx-si476x.o
 obj-$(CONFIG_SND_SOC_IMX_HDMI) += snd-soc-imx-hdmi.o
 obj-$(CONFIG_SND_SOC_IMX_CDNHDMI) += snd-soc-imx-cdnhdmi.o
 obj-$(CONFIG_SND_SOC_IMX_XCVR) += snd-soc-imx-xcvr.o
+obj-$(CONFIG_SND_SOC_IMX_PCM512X) += snd-soc-imx-pcm512x.o
 
 AFLAGS_hdmi_pcm.o := -march=armv7-a -mtune=cortex-a9 -mfpu=neon -mfloat-abi=softfp

sound/soc/fsl/imx-pcm512x.c

@@ -0,0 +1,539 @@
+/* i.MX pcm512x audio support
+ *
+ * Copyright 2020 NXP
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of_device.h>
+#include <linux/i2c.h>
+#include <linux/of_gpio.h>
+#include <linux/clk.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include <sound/pcm.h>
+#include <sound/soc-dapm.h>
+
+#include "fsl_sai.h"
+#include "../codecs/pcm512x.h"
+
+#define DAC_CLK_EXT_44K 22579200UL
+#define DAC_CLK_EXT_48K 24576000UL
+
+struct imx_pcm512x_data {
+	struct snd_soc_dai_link dai_link[3];
+	struct snd_soc_card card;
+	struct snd_soc_codec_conf *codec_conf;
+	struct gpio_desc *mute_gpio;
+	int num_codec_conf;
+	unsigned int slots;
+	unsigned int slot_width;
+	unsigned int daifmt;
+	bool dac_sclk;
+	bool dac_pluspro;
+	bool dac_led_status;
+	bool dac_gain_limit;
+	bool dac_gpio_unmute;
+	bool dac_auto_mute;
+	bool one2one_ratio;
+	bool tdm_mode;
+};
+
+enum ext_osc {
+	DAC_CLK_INT,
+	DAC_CLK_EXT_44EN,
+	DAC_CLK_EXT_48EN,
+};
+
+static const struct imx_pcm512x_fs_map {
+	unsigned int rmin;
+	unsigned int rmax;
+	unsigned int wmin;
+	unsigned int wmax;
+} fs_map[] = {
+	/* Normal, < 32kHz */
+	{ .rmin = 8000,   .rmax = 24000,  .wmin = 1024, .wmax = 1024, },
+	/* Normal, 32kHz */
+	{ .rmin = 32000,  .rmax = 32000,  .wmin = 256,  .wmax = 1024, },
+	/* Normal */
+	{ .rmin = 44100,  .rmax = 48000,  .wmin = 256,  .wmax = 768,  },
+	/* Double */
+	{ .rmin = 88200,  .rmax = 96000,  .wmin = 256,  .wmax = 512,  },
+	/* Quad */
+	{ .rmin = 176400, .rmax = 192000, .wmin = 128,  .wmax = 256,  },
+	/* Oct */
+	{ .rmin = 352800, .rmax = 384000, .wmin = 32,   .wmax = 128,  },
+	/* Hex */
+	{ .rmin = 705600, .rmax = 768000, .wmin = 16,   .wmax = 64,   },
+};
+
+static const u32 pcm512x_rates[] = {
+	8000, 11025, 16000, 22050, 32000,
+	44100, 48000, 64000, 88200, 96000,
+	176400, 192000, 352800, 384000,
+};
+
+static int imx_pcm512x_select_ext_clk(struct snd_soc_component *comp,
+				      int ext_osc)
+{
+	switch(ext_osc) {
+	case DAC_CLK_INT:
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_CONTROL_1, 0x24, 0x00);
+		break;
+	case DAC_CLK_EXT_44EN:
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_CONTROL_1, 0x24, 0x20);
+		break;
+	case DAC_CLK_EXT_48EN:
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_CONTROL_1, 0x24, 0x04);
+		break;
+	}
+
+	return 0;
+}
+
+static bool imx_pcm512x_is_sclk(struct snd_soc_component *comp)
+{
+	unsigned int sclk;
+
+	snd_soc_component_read(comp, PCM512x_RATE_DET_4, &sclk);
+
+	return (!(sclk & 0x40));
+}
+
+static bool imx_pcm512x_is_sclk_sleep(struct snd_soc_component *comp)
+{
+	msleep(2);
+	return imx_pcm512x_is_sclk(comp);
+}
+
+static int imx_pcm512x_dai_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_card *card = rtd->card;
+	struct imx_pcm512x_data *data = snd_soc_card_get_drvdata(card);
+	int ret;
+
+	if (data->dac_gain_limit) {
+		ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
+		if (ret)
+			dev_warn(card->dev, "fail to set volume limit");
+	}
+
+	return 0;
+}
+
+static int imx_pcm512x_set_bias_level(struct snd_soc_card *card,
+	struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
+{
+	struct imx_pcm512x_data *data = snd_soc_card_get_drvdata(card);
+	struct snd_soc_pcm_runtime *rtd;
+	struct snd_soc_dai *codec_dai;
+
+	rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
+	codec_dai = rtd->codec_dai;
+
+	if (dapm->dev != codec_dai->dev)
+		return 0;
+
+	switch (level) {
+	case SND_SOC_BIAS_PREPARE:
+		if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
+			break;
+		/* unmute amp */
+		gpiod_set_value_cansleep(data->mute_gpio, 1);
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
+			break;
+		/* mute amp */
+		gpiod_set_value_cansleep(data->mute_gpio, 0);
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static unsigned long pcm512x_get_mclk_rate(struct snd_pcm_substream *substream,
+					  struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct imx_pcm512x_data *data = snd_soc_card_get_drvdata(rtd->card);
+	unsigned int width = data->slots * data->slot_width;
+	unsigned int rate = params_rate(params);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(fs_map); i++) {
+		if (rate >= fs_map[i].rmin && rate <= fs_map[i].rmax) {
+			width = max(width, fs_map[i].wmin);
+			width = min(width, fs_map[i].wmax);
+			/* Adjust SAI bclk:mclk ratio */
+			width *= data->one2one_ratio ? 1 : 2;
+
+			return rate * width;
+		}
+	}
+
+	/* Let DAI manage clk frequency by default */
+	return 0;
+}
+
+static int imx_pcm512x_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 *cpu_dai = rtd->cpu_dai;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_component *comp = codec_dai->component;
+	struct snd_soc_card *card = rtd->card;
+	struct imx_pcm512x_data *data = snd_soc_card_get_drvdata(card);
+	unsigned int channels = params_channels(params);
+	unsigned int sample_rate = params_rate(params);
+	unsigned long mclk_freq;
+	int ret, i;
+
+	data->slots = 2;
+	data->slot_width = params_physical_width(params);
+
+	ret = snd_soc_dai_set_fmt(cpu_dai, data->daifmt);
+	if (ret) {
+		dev_err(card->dev, "failed to set cpu dai fmt: %d\n", ret);
+		return ret;
+	}
+
+	ret = snd_soc_dai_set_tdm_slot(cpu_dai,
+				       BIT(channels) - 1, BIT(channels) - 1,
+				       data->slots, data->slot_width);
+	if (ret) {
+		dev_err(card->dev, "failed to set cpu dai tdm slot: %d\n", ret);
+		return ret;
+	}
+
+	ret = snd_soc_dai_set_bclk_ratio(cpu_dai, data->slots * data->slot_width);
+	if (ret) {
+		dev_err(card->dev, "failed to set cpu dai bclk ratio\n");
+		return ret;
+	}
+
+	for (i = 0; i < rtd->num_codecs; i++) {
+		struct snd_soc_dai *codec_dai = rtd->codec_dai;
+
+		ret = snd_soc_dai_set_fmt(codec_dai, data->daifmt);
+		if (ret) {
+			dev_err(card->dev, "failed to set codec dai[%d] fmt: %d\n",
+					i, ret);
+			return ret;
+		}
+
+		ret = snd_soc_dai_set_bclk_ratio(codec_dai,
+					data->slots * data->slot_width);
+		if (ret) {
+			dev_err(card->dev, "failed to set cpu dai bclk ratio\n");
+			return ret;
+		}
+	}
+
+	/* set MCLK freq */
+	if (data->dac_pluspro && data->dac_sclk) {
+		if (do_div(sample_rate, 8000)) {
+			mclk_freq = DAC_CLK_EXT_44K;
+			imx_pcm512x_select_ext_clk(comp, DAC_CLK_EXT_44EN);
+			ret = snd_soc_dai_set_sysclk(codec_dai,
+				PCM512x_SYSCLK_MCLK1, mclk_freq, SND_SOC_CLOCK_IN);
+		} else {
+			mclk_freq = DAC_CLK_EXT_48K;
+			imx_pcm512x_select_ext_clk(comp, DAC_CLK_EXT_48EN);
+			ret = snd_soc_dai_set_sysclk(codec_dai,
+				PCM512x_SYSCLK_MCLK2, mclk_freq, SND_SOC_CLOCK_IN);
+		}
+		if (ret < 0)
+			dev_err(card->dev, "failed to set cpu dai mclk rate (%lu): %d\n",
+				mclk_freq, ret);
+	} else {
+		mclk_freq = pcm512x_get_mclk_rate(substream, params);
+		ret = snd_soc_dai_set_sysclk(cpu_dai, FSL_SAI_CLK_MAST1,
+					     mclk_freq, SND_SOC_CLOCK_OUT);
+		if (ret < 0)
+			dev_err(card->dev, "failed to set cpu dai mclk1 rate (%lu): %d\n",
+				mclk_freq, ret);
+	}
+
+	return ret;
+}
+
+static int imx_pcm512x_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_card *card = rtd->card;
+	struct imx_pcm512x_data *data = snd_soc_card_get_drvdata(card);
+	static struct snd_pcm_hw_constraint_list constraint_rates;
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_component *comp = codec_dai->component;
+	bool ext_44sclk, ext_48sclk, ext_nosclk;
+	int ret;
+
+	constraint_rates.list = pcm512x_rates;
+	constraint_rates.count = ARRAY_SIZE(pcm512x_rates);
+
+	ret = snd_pcm_hw_constraint_list(runtime, 0,
+			SNDRV_PCM_HW_PARAM_RATE, &constraint_rates);
+	if (ret)
+		return ret;
+
+	if (data->dac_led_status) {
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_EN, 0x08, 0x08);
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_OUTPUT_4, 0x0f, 0x02);
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_CONTROL_1, 0x08, 0x08);
+	}
+
+	if (data->dac_sclk) {
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_EN, 0x24, 0x24);
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_OUTPUT_3, 0x0f, 0x02);
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_OUTPUT_6, 0x0f, 0x02);
+
+		imx_pcm512x_select_ext_clk(comp, DAC_CLK_EXT_44EN);
+		ext_44sclk = imx_pcm512x_is_sclk_sleep(comp);
+
+		imx_pcm512x_select_ext_clk(comp, DAC_CLK_EXT_48EN);
+		ext_48sclk = imx_pcm512x_is_sclk_sleep(comp);
+
+		imx_pcm512x_select_ext_clk(comp, DAC_CLK_INT);
+		ext_nosclk = imx_pcm512x_is_sclk_sleep(comp);
+
+		data->dac_pluspro = (ext_44sclk && ext_48sclk && !ext_nosclk);
+	}
+
+	return 0;
+}
+
+static void imx_pcm512x_shutdown(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_card *card = rtd->card;
+	struct imx_pcm512x_data *data = snd_soc_card_get_drvdata(card);
+	struct snd_soc_dai *codec_dai = rtd->codec_dai;
+	struct snd_soc_component *comp = codec_dai->component;
+
+	if (data->dac_led_status)
+		snd_soc_component_update_bits(comp, PCM512x_GPIO_CONTROL_1, 0x08, 0x00);
+}
+
+static struct snd_soc_ops imx_pcm512x_ops = {
+	.hw_params = imx_pcm512x_hw_params,
+	.startup = imx_pcm512x_startup,
+	.shutdown = imx_pcm512x_shutdown,
+};
+
+SND_SOC_DAILINK_DEFS(hifi,
+	DAILINK_COMP_ARRAY(COMP_EMPTY()),
+	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "pcm512x-hifi")),
+	DAILINK_COMP_ARRAY(COMP_EMPTY()));
+
+static struct snd_soc_dai_link_component pcm512x_codecs[] = {
+	{
+		/* Playback */
+		.dai_name = "pcm512x-hifi",
+	},
+};
+
+static struct snd_soc_dai_link imx_pcm512x_dai[] = {
+	{
+		.name = "pcm512x-audio",
+		.stream_name = "audio",
+		.codecs = pcm512x_codecs,
+		.num_codecs = 1,
+		.ops = &imx_pcm512x_ops,
+		.init = imx_pcm512x_dai_init,
+		.ignore_pmdown_time = 1,
+		SND_SOC_DAILINK_REG(hifi),
+	},
+};
+
+static int imx_pcm512x_probe(struct platform_device *pdev)
+{
+	struct device_node *bitclkmaster, *framemaster = NULL;
+	struct device_node *cpu_np, *codec_np = NULL;
+	struct device_node *np = pdev->dev.of_node;
+	struct platform_device *cpu_pdev = NULL;
+	struct snd_soc_dai_link_component *comp;
+	struct imx_pcm512x_data *data;
+	struct i2c_client *codec_dev;
+	int ret;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
+	if (!comp)
+		return -ENOMEM;
+
+	cpu_np = of_parse_phandle(np, "audio-cpu", 0);
+	if (!cpu_np) {
+		dev_err(&pdev->dev, "audio dai phandle missing or invalid\n");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	codec_np = of_parse_phandle(np, "audio-codec", 0);
+	if (!codec_np) {
+		dev_err(&pdev->dev, "audio codec phandle missing or invalid\n");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	cpu_pdev = of_find_device_by_node(cpu_np);
+	if (!cpu_pdev) {
+		dev_err(&pdev->dev, "failed to find SAI platform device\n");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	codec_dev = of_find_i2c_device_by_node(codec_np);
+	if (!codec_dev || !codec_dev->dev.driver) {
+		dev_err(&pdev->dev, "failed to find codec device\n");
+		ret = -EPROBE_DEFER;
+		goto fail;
+	}
+
+	data->dac_gain_limit = of_property_read_bool(np, "dac,24db_digital_gain");
+	data->dac_auto_mute = of_property_read_bool(np, "dac,auto_mute_amp");
+	data->dac_gpio_unmute = of_property_read_bool(np, "dac,unmute_amp");
+	data->dac_led_status = of_property_read_bool(np, "dac,led_status");
+
+	if (data->dac_auto_mute || data->dac_gpio_unmute) {
+		data->mute_gpio = devm_gpiod_get_optional(&pdev->dev,
+						"mute-amp", GPIOD_OUT_LOW);
+		if (IS_ERR(data->mute_gpio)) {
+			dev_err(&pdev->dev, "failed to get mute amp gpio\n");
+			ret = PTR_ERR(data->mute_gpio);
+			goto fail;
+		}
+	}
+
+	if (data->dac_auto_mute && data->dac_gpio_unmute)
+		data->card.set_bias_level = imx_pcm512x_set_bias_level;
+
+	platform_set_drvdata(pdev, &data->card);
+	snd_soc_card_set_drvdata(&data->card, data);
+
+	memcpy(data->dai_link, imx_pcm512x_dai,
+	       sizeof(struct snd_soc_dai_link) * ARRAY_SIZE(data->dai_link));
+
+	data->card.owner = THIS_MODULE;
+	data->card.dev = &pdev->dev;
+	data->card.dai_link = data->dai_link;
+	data->card.num_links = 1;
+
+	ret = snd_soc_of_parse_card_name(&data->card, "model");
+	if (ret) {
+		dev_err(&pdev->dev, "failed to find card model name\n");
+		goto fail;
+	}
+
+	if (of_property_read_bool(np, "audio-routing")) {
+		ret = snd_soc_of_parse_audio_routing(&data->card, "audio-routing");
+		if (ret) {
+			dev_err(&pdev->dev, "failed to parse audio-routing\n");
+			goto fail;
+		}
+	}
+
+	if (of_property_read_bool(np, "audio-widgets")) {
+		ret = snd_soc_of_parse_audio_simple_widgets(&data->card, "audio-widgets");
+		if (ret) {
+			dev_err(&pdev->dev, "failed to parse audio-widgets\n");
+			goto fail;
+		}
+	}
+
+	data->daifmt = snd_soc_of_parse_daifmt(np, NULL, &bitclkmaster, &framemaster);
+	data->daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
+
+	if (codec_np == bitclkmaster)
+		data->daifmt |= (codec_np == framemaster) ?
+			SND_SOC_DAIFMT_CBM_CFM : SND_SOC_DAIFMT_CBM_CFS;
+	else
+		data->daifmt |= (codec_np == framemaster) ?
+			SND_SOC_DAIFMT_CBS_CFM : SND_SOC_DAIFMT_CBS_CFS;
+
+	if (!bitclkmaster)
+		of_node_put(bitclkmaster);
+	if (!framemaster)
+		of_node_put(framemaster);
+
+	if (of_property_read_bool(codec_np, "clocks"))
+		data->dac_sclk = true;
+
+	data->dai_link[0].cpus = &comp[0];
+	data->dai_link[0].num_cpus = 1;
+	data->dai_link[0].codecs = &comp[1];
+	data->dai_link[0].num_codecs = 1;
+	data->dai_link[0].platforms = &comp[2];
+	data->dai_link[0].num_platforms = 1;
+
+	data->dai_link[0].cpus->of_node = cpu_np;
+	data->dai_link[0].platforms->of_node = cpu_np;
+	data->dai_link[0].codecs->of_node = codec_np;
+	data->dai_link[0].codecs->dai_name = "pcm512x-hifi";
+	data->dai_link[0].dai_fmt = data->daifmt;
+
+	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
+	if (ret) {
+		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
+		goto fail;
+	}
+
+	if (data->dac_gpio_unmute && data->dac_auto_mute)
+		gpiod_set_value_cansleep(data->mute_gpio, 1);
+
+	ret = 0;
+fail:
+	if (cpu_np)
+		of_node_put(cpu_np);
+	if (codec_np)
+		of_node_put(codec_np);
+
+	return ret;
+}
+
+static int imx_pcm512x_remove(struct platform_device *pdev)
+{
+	struct imx_pcm512x_data *data = platform_get_drvdata(pdev);
+
+	if (data->mute_gpio)
+		gpiod_set_value_cansleep(data->mute_gpio, 0);
+
+	return snd_soc_unregister_card(&data->card);
+}
+
+static const struct of_device_id imx_pcm512x_dt_ids[] = {
+	{ .compatible = "fsl,imx-audio-pcm512x", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, imx_pcm512x_dt_ids);
+
+static struct platform_driver imx_pcm512x_driver = {
+	.driver = {
+		.name = "imx-pcm512x",
+		.pm = &snd_soc_pm_ops,
+		.of_match_table = imx_pcm512x_dt_ids,
+	},
+	.probe = imx_pcm512x_probe,
+	.remove = imx_pcm512x_remove,
+};
+module_platform_driver(imx_pcm512x_driver);
+
+MODULE_DESCRIPTION("NXP i.MX pcm512x ASoC machine driver");
+MODULE_AUTHOR("Adrian Alonso <adrian.alonso@nxp.com>");
+MODULE_ALIAS("platform:imx-pcm512x");
+MODULE_LICENSE("GPL");