path: root/target/linux/xburst/patches-2.6.34/060-jzcodec.patch

From 3ff79323c50cc67df122c8f02670ff5483ea7ebc Mon Sep 17 00:00:00 2001
From: Lars-Peter Clausen <lars@metafoo.de>
Date: Sat, 24 Apr 2010 12:32:57 +0200
Subject: [PATCH] Add jz4740 codec driver

---
 sound/soc/codecs/Kconfig   |    7 +
 sound/soc/codecs/Makefile  |    2 +
 sound/soc/codecs/jzcodec.c |  513 ++++++++++++++++++++++++++++++++++++++++++++
 sound/soc/codecs/jzcodec.h |   22 ++
 4 files changed, 544 insertions(+), 0 deletions(-)
 create mode 100644 sound/soc/codecs/jzcodec.c
 create mode 100644 sound/soc/codecs/jzcodec.h

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 1743d56..b25598a 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -260,6 +260,13 @@ config SND_SOC_WM9712
 config SND_SOC_WM9713
 	tristate
 
+config SND_SOC_JZCODEC
+	tristate "JZ4720/JZ4740 SoC internal codec"
+	depends on SND_SOC && SOC_JZ4740
+	help
+	  Say Y if you want to use internal codec on Ingenic JZ4720/JZ4740 based
+	  boards.
+
 # Amp
 config SND_SOC_MAX9877
 	tristate
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index dd5ce6d..3f6ce05 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -54,6 +54,7 @@ snd-soc-wm9705-objs := wm9705.o
 snd-soc-wm9712-objs := wm9712.o
 snd-soc-wm9713-objs := wm9713.o
 snd-soc-wm-hubs-objs := wm_hubs.o
+snd-soc-jzcodec-objs := jzcodec.o
 
 # Amp
 snd-soc-max9877-objs := max9877.o
@@ -116,6 +117,7 @@ obj-$(CONFIG_SND_SOC_WM9705)	+= snd-soc-wm9705.o
 obj-$(CONFIG_SND_SOC_WM9712)	+= snd-soc-wm9712.o
 obj-$(CONFIG_SND_SOC_WM9713)	+= snd-soc-wm9713.o
 obj-$(CONFIG_SND_SOC_WM_HUBS)	+= snd-soc-wm-hubs.o
+obj-$(CONFIG_SND_SOC_JZCODEC)	+= snd-soc-jzcodec.o
 
 # Amp
 obj-$(CONFIG_SND_SOC_MAX9877)	+= snd-soc-max9877.o
diff --git a/sound/soc/codecs/jzcodec.c b/sound/soc/codecs/jzcodec.c
new file mode 100644
index 0000000..f960d46
--- /dev/null
+++ b/sound/soc/codecs/jzcodec.c
@@ -0,0 +1,513 @@
+/*
+ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * 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.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/delay.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc-dapm.h>
+#include <sound/soc.h>
+
+#define JZ_REG_CODEC_1 0x0
+#define JZ_REG_CODEC_2 0x1
+
+#define JZ_CODEC_1_LINE_ENABLE BIT(29)
+#define JZ_CODEC_1_MIC_ENABLE BIT(28)
+#define JZ_CODEC_1_SW1_ENABLE BIT(27)
+#define JZ_CODEC_1_ADC_ENABLE BIT(26)
+#define JZ_CODEC_1_SW2_ENABLE BIT(25)
+#define JZ_CODEC_1_DAC_ENABLE BIT(24)
+#define JZ_CODEC_1_VREF_DISABLE BIT(20)
+#define JZ_CODEC_1_VREF_AMP_DISABLE BIT(19)
+#define JZ_CODEC_1_VREF_PULL_DOWN BIT(18)
+#define JZ_CODEC_1_VREF_LOW_CURRENT BIT(17)
+#define JZ_CODEC_1_VREF_HIGH_CURRENT BIT(16)
+#define JZ_CODEC_1_HEADPHONE_DISABLE BIT(14)
+#define JZ_CODEC_1_HEADPHONE_AMP_CHANGE_ANY BIT(13)
+#define JZ_CODEC_1_HEADPHONE_CHANGE BIT(12)
+#define JZ_CODEC_1_HEADPHONE_PULL_DOWN_M BIT(11)
+#define JZ_CODEC_1_HEADPHONE_PULL_DOWN_R BIT(10)
+#define JZ_CODEC_1_HEADPHONE_POWER_DOWN_M BIT(9)
+#define JZ_CODEC_1_HEADPHONE_POWER_DOWN BIT(8)
+#define JZ_CODEC_1_SUSPEND BIT(1)
+#define JZ_CODEC_1_RESET BIT(0)
+
+#define JZ_CODEC_1_LINE_ENABLE_OFFSET 29
+#define JZ_CODEC_1_MIC_ENABLE_OFFSET 28
+#define JZ_CODEC_1_SW1_ENABLE_OFFSET 27
+#define JZ_CODEC_1_ADC_ENABLE_OFFSET 26
+#define JZ_CODEC_1_SW2_ENABLE_OFFSET 25
+#define JZ_CODEC_1_DAC_ENABLE_OFFSET 24
+#define JZ_CODEC_1_HEADPHONE_DISABLE_OFFSET 14
+#define JZ_CODEC_1_HEADPHONE_POWER_DOWN_OFFSET 8
+
+#define JZ_CODEC_2_INPUT_VOLUME_MASK		0x1f0000
+#define JZ_CODEC_2_SAMPLE_RATE_MASK			0x000f00
+#define JZ_CODEC_2_MIC_BOOST_GAIN_MASK		0x000030
+#define JZ_CODEC_2_HEADPHONE_VOLUME_MASK	0x000003
+
+#define JZ_CODEC_2_INPUT_VOLUME_OFFSET		16
+#define JZ_CODEC_2_SAMPLE_RATE_OFFSET		 8
+#define JZ_CODEC_2_MIC_BOOST_GAIN_OFFSET	 4
+#define JZ_CODEC_2_HEADPHONE_VOLUME_OFFSET	 0
+
+struct jz_codec {
+	void __iomem *base;
+	struct resource *mem;
+
+	uint32_t reg_cache[2];
+	struct snd_soc_codec codec;
+};
+
+static inline struct jz_codec *codec_to_jz(struct snd_soc_codec *codec)
+{
+	return container_of(codec, struct jz_codec, codec);
+}
+
+static unsigned int jz_codec_read(struct snd_soc_codec *codec, unsigned int reg)
+{
+	struct jz_codec *jz_codec = codec_to_jz(codec);
+	return readl(jz_codec->base + (reg << 2));
+}
+
+static int jz_codec_write(struct snd_soc_codec *codec, unsigned int reg,
+unsigned int val)
+{
+	struct jz_codec *jz_codec = codec_to_jz(codec);
+	jz_codec->reg_cache[reg] = val;
+
+	writel(val, jz_codec->base + (reg << 2));
+	return 0;
+}
+
+static const struct snd_kcontrol_new jz_codec_controls[] = {
+	SOC_SINGLE("Master Playback Volume", JZ_REG_CODEC_2,
+			JZ_CODEC_2_HEADPHONE_VOLUME_OFFSET, 3, 0),
+	SOC_SINGLE("Capture Volume", JZ_REG_CODEC_2,
+			JZ_CODEC_2_INPUT_VOLUME_OFFSET, 31, 0),
+	SOC_SINGLE("Master Playback Switch", JZ_REG_CODEC_1,
+			JZ_CODEC_1_HEADPHONE_DISABLE_OFFSET, 1, 1),
+	SOC_SINGLE("Mic Capture Volume", JZ_REG_CODEC_2,
+			JZ_CODEC_2_MIC_BOOST_GAIN_OFFSET, 3, 0),
+};
+
+static const struct snd_kcontrol_new jz_codec_output_controls[] = {
+	SOC_DAPM_SINGLE("Bypass Switch", JZ_REG_CODEC_1,
+			JZ_CODEC_1_SW1_ENABLE_OFFSET, 1, 0),
+	SOC_DAPM_SINGLE("DAC Switch", JZ_REG_CODEC_1,
+			JZ_CODEC_1_SW2_ENABLE_OFFSET, 1, 0),
+};
+
+static const struct snd_kcontrol_new jz_codec_input_controls[] = {
+	SOC_DAPM_SINGLE("Line Capture Switch", JZ_REG_CODEC_1,
+			JZ_CODEC_1_LINE_ENABLE_OFFSET, 1, 0),
+	SOC_DAPM_SINGLE("Mic Capture Switch", JZ_REG_CODEC_1,
+			JZ_CODEC_1_MIC_ENABLE_OFFSET, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget jz_codec_dapm_widgets[] = {
+	SND_SOC_DAPM_ADC("ADC", "Capture", JZ_REG_CODEC_1,
+			JZ_CODEC_1_ADC_ENABLE_OFFSET, 0),
+	SND_SOC_DAPM_DAC("DAC", "Playback", JZ_REG_CODEC_1,
+			JZ_CODEC_1_DAC_ENABLE_OFFSET, 0),
+
+	SND_SOC_DAPM_MIXER("Output Mixer", JZ_REG_CODEC_1,
+			JZ_CODEC_1_HEADPHONE_POWER_DOWN_OFFSET, 1,
+			jz_codec_output_controls,
+			ARRAY_SIZE(jz_codec_output_controls)),
+
+	SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
+			jz_codec_input_controls,
+			ARRAY_SIZE(jz_codec_input_controls)),
+	SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
+
+	SND_SOC_DAPM_OUTPUT("LOUT"),
+	SND_SOC_DAPM_OUTPUT("ROUT"),
+
+	SND_SOC_DAPM_INPUT("MIC"),
+	SND_SOC_DAPM_INPUT("LIN"),
+	SND_SOC_DAPM_INPUT("RIN"),
+};
+
+static const struct snd_soc_dapm_route jz_codec_dapm_routes[] = {
+
+	{"Line Input", NULL, "LIN"},
+	{"Line Input", NULL, "RIN"},
+
+	{"Input Mixer", "Line Capture Switch", "Line Input"},
+	{"Input Mixer", "Mic Capture Switch", "MIC"},
+
+	{"ADC", NULL, "Input Mixer"},
+
+	{"Output Mixer", "Bypass Switch", "Input Mixer"},
+	{"Output Mixer", "DAC Switch", "DAC"},
+
+	{"LOUT", NULL, "Output Mixer"},
+	{"ROUT", NULL, "Output Mixer"},
+};
+
+static int jz_codec_hw_params(struct snd_pcm_substream *substream, struct
+snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	uint32_t val;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_device *socdev = rtd->socdev;
+	struct snd_soc_codec *codec = socdev->card->codec;
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S8:
+	case SNDRV_PCM_FORMAT_S16_LE:
+	case SNDRV_PCM_FORMAT_S18_3LE:
+		break;
+	default:
+		return -EINVAL;
+		break;
+	}
+
+	switch (params_rate(params)) {
+	case 8000:
+		val = 0;
+		break;
+	case 11025:
+		val = 1;
+		break;
+	case 12000:
+		val = 2;
+		break;
+	case 16000:
+		val = 3;
+		break;
+	case 22050:
+		val = 4;
+		break;
+	case 24000:
+		val = 5;
+		break;
+	case 32000:
+		val = 6;
+		break;
+	case 44100:
+		val = 7;
+		break;
+	case 48000:
+		val = 8;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	val <<= JZ_CODEC_2_SAMPLE_RATE_OFFSET;
+
+	snd_soc_update_bits(codec, JZ_REG_CODEC_2,
+				JZ_CODEC_2_SAMPLE_RATE_MASK, val);
+
+	return 0;
+}
+
+static int jz_codec_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int jz_codec_set_sysclk(struct snd_soc_dai *codec_dai,
+		int clk_id, unsigned int freq, int dir)
+{
+	return 0;
+}
+
+
+static struct snd_soc_dai_ops jz_codec_dai_ops = {
+	.hw_params = jz_codec_hw_params,
+	.set_fmt = jz_codec_set_fmt,
+/*	.set_clkdiv = jz_codec_set_clkdiv,*/
+	.set_sysclk = jz_codec_set_sysclk,
+};
+
+struct snd_soc_dai jz_codec_dai = {
+	.name = "jz-codec",
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_44100,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_8000_44100,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.ops = &jz_codec_dai_ops,
+	.symmetric_rates = 1,
+};
+EXPORT_SYMBOL_GPL(jz_codec_dai);
+
+static int jz_codec_set_bias_level(struct snd_soc_codec *codec,
+				enum snd_soc_bias_level level)
+{
+
+	if (codec->bias_level == SND_SOC_BIAS_OFF && level != SND_SOC_BIAS_OFF) {
+		snd_soc_update_bits(codec, JZ_REG_CODEC_1,
+			JZ_CODEC_1_RESET, JZ_CODEC_1_RESET);
+		udelay(2);
+
+		snd_soc_update_bits(codec, JZ_REG_CODEC_1,
+			JZ_CODEC_1_SUSPEND | JZ_CODEC_1_RESET, 0);
+	}
+	switch (level) {
+	case SND_SOC_BIAS_ON:
+		snd_soc_update_bits(codec, JZ_REG_CODEC_1,
+			JZ_CODEC_1_VREF_DISABLE |
+			JZ_CODEC_1_VREF_AMP_DISABLE |
+			JZ_CODEC_1_HEADPHONE_POWER_DOWN_M |
+			JZ_CODEC_1_VREF_LOW_CURRENT |
+			JZ_CODEC_1_VREF_HIGH_CURRENT,
+			0);
+		break;
+	case SND_SOC_BIAS_PREPARE:
+		snd_soc_update_bits(codec, JZ_REG_CODEC_1,
+			JZ_CODEC_1_VREF_LOW_CURRENT |
+			JZ_CODEC_1_VREF_HIGH_CURRENT,
+			JZ_CODEC_1_VREF_LOW_CURRENT |
+			JZ_CODEC_1_VREF_HIGH_CURRENT);
+		break;
+	case SND_SOC_BIAS_STANDBY:
+		snd_soc_update_bits(codec, JZ_REG_CODEC_1,
+			JZ_CODEC_1_VREF_DISABLE | JZ_CODEC_1_VREF_AMP_DISABLE,
+			JZ_CODEC_1_VREF_DISABLE | JZ_CODEC_1_VREF_AMP_DISABLE);
+		break;
+	case SND_SOC_BIAS_OFF:
+		snd_soc_update_bits(codec, JZ_REG_CODEC_1,
+			JZ_CODEC_1_SUSPEND, JZ_CODEC_1_SUSPEND);
+		break;
+	}
+	codec->bias_level = level;
+
+	return 0;
+}
+
+
+static struct snd_soc_codec *jz_codec_codec;
+
+static int jz_codec_dev_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_codec *codec = jz_codec_codec;
+
+	BUG_ON(!codec);
+
+	socdev->card->codec = codec;
+
+	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to create pcms: %d\n", ret);
+		return ret;
+	}
+
+	snd_soc_add_controls(codec, jz_codec_controls,
+	ARRAY_SIZE(jz_codec_controls));
+
+	snd_soc_dapm_new_controls(codec, jz_codec_dapm_widgets,
+	ARRAY_SIZE(jz_codec_dapm_widgets));
+
+	snd_soc_dapm_add_routes(codec, jz_codec_dapm_routes,
+	ARRAY_SIZE(jz_codec_dapm_routes));
+
+	snd_soc_dapm_new_widgets(codec);
+
+	return 0;
+}
+
+static int jz_codec_dev_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	snd_soc_free_pcms(socdev);
+	snd_soc_dapm_free(socdev);
+
+	return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_jzcodec = {
+	.probe = jz_codec_dev_probe,
+	.remove = jz_codec_dev_remove,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_jzcodec);
+
+static int __devinit jz_codec_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct jz_codec *jz_codec;
+	struct snd_soc_codec *codec;
+
+	jz_codec = kzalloc(sizeof(*jz_codec), GFP_KERNEL);
+
+	if (!jz_codec)
+		return -ENOMEM;
+
+	jz_codec->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	if (!jz_codec->mem) {
+		dev_err(&pdev->dev, "Failed to get mmio memory resource\n");
+		ret = -ENOENT;
+		goto err_free_jz_codec;
+	}
+
+	jz_codec->mem = request_mem_region(jz_codec->mem->start,
+				resource_size(jz_codec->mem), pdev->name);
+
+	if (!jz_codec->mem) {
+		dev_err(&pdev->dev, "Failed to request mmio memory region\n");
+		ret = -EBUSY;
+		goto err_free_jz_codec;
+	}
+
+	jz_codec->base = ioremap(jz_codec->mem->start, resource_size(jz_codec->mem));
+
+	if (!jz_codec->base) {
+		dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
+		ret = -EBUSY;
+		goto err_release_mem_region;
+	}
+
+	jz_codec_dai.dev = &pdev->dev;
+
+	codec = &jz_codec->codec;
+
+	codec->dev		= &pdev->dev;
+	codec->name		= "jz-codec";
+	codec->owner		= THIS_MODULE;
+
+	codec->read		= jz_codec_read;
+	codec->write		= jz_codec_write;
+	codec->set_bias_level	= jz_codec_set_bias_level;
+	codec->bias_level	= SND_SOC_BIAS_OFF;
+
+	codec->dai		= &jz_codec_dai;
+	codec->num_dai		= 1;
+
+	codec->reg_cache	= jz_codec->reg_cache;
+	codec->reg_cache_size	= 2;
+
+	codec->private_data	= jz_codec;
+
+	mutex_init(&codec->mutex);
+	INIT_LIST_HEAD(&codec->dapm_widgets);
+	INIT_LIST_HEAD(&codec->dapm_paths);
+
+	jz_codec_codec = codec;
+
+	snd_soc_update_bits(codec, JZ_REG_CODEC_1,
+				JZ_CODEC_1_SW2_ENABLE, JZ_CODEC_1_SW2_ENABLE);
+
+
+	platform_set_drvdata(pdev, jz_codec);
+	ret = snd_soc_register_codec(codec);
+
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register codec\n");
+		goto err_iounmap;
+	}
+
+	ret = snd_soc_register_dai(&jz_codec_dai);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register codec dai\n");
+		goto err_unregister_codec;
+	}
+
+	jz_codec_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+	return 0;
+err_unregister_codec:
+	snd_soc_unregister_codec(codec);
+err_iounmap:
+	iounmap(jz_codec->base);
+err_release_mem_region:
+	release_mem_region(jz_codec->mem->start, resource_size(jz_codec->mem));
+err_free_jz_codec:
+	kfree(jz_codec);
+
+	return ret;
+}
+
+static int __devexit jz_codec_remove(struct platform_device *pdev)
+{
+	struct jz_codec *jz_codec = platform_get_drvdata(pdev);
+
+	snd_soc_unregister_dai(&jz_codec_dai);
+	snd_soc_unregister_codec(&jz_codec->codec);
+
+	iounmap(jz_codec->base);
+	release_mem_region(jz_codec->mem->start, resource_size(jz_codec->mem));
+
+	platform_set_drvdata(pdev, NULL);
+	kfree(jz_codec);
+
+	return 0;
+}
+
+static struct platform_driver jz_codec_driver = {
+	.probe = jz_codec_probe,
+	.remove = __devexit_p(jz_codec_remove),
+	.driver = {
+		.name = "jz4740-codec",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init jz_codec_init(void)
+{
+	return platform_driver_register(&jz_codec_driver);
+}
+module_init(jz_codec_init);
+
+static void __exit jz_codec_exit(void)
+{
+	platform_driver_unregister(&jz_codec_driver);
+}
+module_exit(jz_codec_exit);
+
+MODULE_DESCRIPTION("JZ4720/JZ4740 SoC internal codec driver");
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:jz-codec");
diff --git a/sound/soc/codecs/jzcodec.h b/sound/soc/codecs/jzcodec.h
new file mode 100644
index 0000000..05c57b8
--- /dev/null
+++ b/sound/soc/codecs/jzcodec.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * 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.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef _ICODEC_H
+#define _ICODEC_H
+
+#define JZCODEC_SYSCLK	0
+
+extern struct snd_soc_dai jz_codec_dai;
+extern struct snd_soc_codec_device soc_codec_dev_jzcodec;
+
+#endif
-- 
1.5.6.5