Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 557 insertions, 0 deletions

diff --git a/sound/soc/codecs/max9867.c b/sound/soc/codecs/max9867.c
new file mode 100644
index 000000000..e51143df4
--- /dev/null
+++ b/sound/soc/codecs/max9867.c
@@ -0,0 +1,557 @@
+/*
+ * max9867.c -- max9867 ALSA SoC Audio driver
+ *
+ * Copyright 2013-15 Maxim Integrated Products
+ *
+ * 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/delay.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+#include "max9867.h"
+
+static const char *const max9867_spmode[] = {
+	"Stereo Diff", "Mono Diff",
+	"Stereo Cap", "Mono Cap",
+	"Stereo Single", "Mono Single",
+	"Stereo Single Fast", "Mono Single Fast"
+};
+static const char *const max9867_sidetone_text[] = {
+	"None", "Left", "Right", "LeftRight", "LeftRightDiv2",
+};
+static const char *const max9867_filter_text[] = {"IIR", "FIR"};
+
+static SOC_ENUM_SINGLE_DECL(max9867_filter, MAX9867_CODECFLTR, 7,
+	max9867_filter_text);
+static SOC_ENUM_SINGLE_DECL(max9867_spkmode, MAX9867_MODECONFIG, 0,
+	max9867_spmode);
+static SOC_ENUM_SINGLE_DECL(max9867_sidetone, MAX9867_DACGAIN, 6,
+	max9867_sidetone_text);
+static DECLARE_TLV_DB_SCALE(max9860_capture_tlv, -600, 200, 0);
+static DECLARE_TLV_DB_SCALE(max9860_mic_tlv, 2000, 100, 1);
+static DECLARE_TLV_DB_SCALE(max9860_adc_left_tlv, -1200, 100, 1);
+static DECLARE_TLV_DB_SCALE(max9860_adc_right_tlv, -1200, 100, 1);
+static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(max98088_micboost_tlv,
+	0, 1, TLV_DB_SCALE_ITEM(0, 2000, 0),
+	2, 2, TLV_DB_SCALE_ITEM(3000, 0, 0),
+);
+
+static const struct snd_kcontrol_new max9867_snd_controls[] = {
+	SOC_DOUBLE_R("Master Playback Volume", MAX9867_LEFTVOL,
+				MAX9867_RIGHTVOL, 0, 63, 1),
+	SOC_DOUBLE_R_TLV("Capture Volume", MAX9867_LEFTMICGAIN,
+			MAX9867_RIGHTMICGAIN,
+			0, 15, 1, max9860_capture_tlv),
+	SOC_DOUBLE_R_TLV("Mic Volume", MAX9867_LEFTMICGAIN,
+			MAX9867_RIGHTMICGAIN, 0, 31, 1, max9860_mic_tlv),
+	SOC_DOUBLE_R_TLV("Mic Boost Volume", MAX9867_LEFTMICGAIN,
+			MAX9867_RIGHTMICGAIN, 5, 3, 0, max98088_micboost_tlv),
+	SOC_ENUM("Digital Sidetone Src", max9867_sidetone),
+	SOC_SINGLE("Sidetone Volume", MAX9867_DACGAIN, 0, 31, 1),
+	SOC_SINGLE("DAC Volume", MAX9867_DACLEVEL, 4, 3, 0),
+	SOC_SINGLE("DAC Attenuation", MAX9867_DACLEVEL, 0, 15, 1),
+	SOC_SINGLE_TLV("ADC Left Volume", MAX9867_ADCLEVEL,
+			4, 15, 1, max9860_adc_left_tlv),
+	SOC_SINGLE_TLV("ADC Right Volume", MAX9867_ADCLEVEL,
+			0, 15, 1, max9860_adc_right_tlv),
+	SOC_ENUM("Speaker Mode", max9867_spkmode),
+	SOC_SINGLE("Volume Smoothing Switch", MAX9867_MODECONFIG, 6, 1, 0),
+	SOC_SINGLE("ZCD Switch", MAX9867_MODECONFIG, 5, 1, 0),
+	SOC_ENUM("DSP Filter", max9867_filter),
+};
+
+static const char *const max9867_mux[] = {"None", "Mic", "Line", "Mic_Line"};
+
+static SOC_ENUM_SINGLE_DECL(max9867_mux_enum,
+	MAX9867_INPUTCONFIG, MAX9867_INPUT_SHIFT,
+	max9867_mux);
+
+static const struct snd_kcontrol_new max9867_dapm_mux_controls =
+	SOC_DAPM_ENUM("Route", max9867_mux_enum);
+
+static const struct snd_kcontrol_new max9867_left_dapm_control =
+	SOC_DAPM_SINGLE("Switch", MAX9867_PWRMAN, 6, 1, 0);
+static const struct snd_kcontrol_new max9867_right_dapm_control =
+	SOC_DAPM_SINGLE("Switch", MAX9867_PWRMAN, 5, 1, 0);
+static const struct snd_kcontrol_new max9867_line_dapm_control =
+	SOC_DAPM_SINGLE("Switch", MAX9867_LEFTLINELVL, 6, 1, 1);
+
+static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
+	SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_DAC("Left DAC", NULL, MAX9867_PWRMAN, 3, 0),
+	SND_SOC_DAPM_DAC("Right DAC", NULL, MAX9867_PWRMAN, 2, 0),
+	SND_SOC_DAPM_MIXER("Output Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
+	SND_SOC_DAPM_OUTPUT("HPOUT"),
+
+	SND_SOC_DAPM_AIF_IN("DAI_IN", "HiFi Capture", 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_ADC("Left ADC", "HiFi Capture", MAX9867_PWRMAN, 1, 0),
+	SND_SOC_DAPM_ADC("Right ADC", "HiFi Capture", MAX9867_PWRMAN, 0, 0),
+	SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
+		&max9867_dapm_mux_controls),
+
+	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
+	SND_SOC_DAPM_SWITCH("Left Line", MAX9867_LEFTLINELVL, 6, 1,
+		&max9867_left_dapm_control),
+	SND_SOC_DAPM_SWITCH("Right Line", MAX9867_RIGTHLINELVL, 6, 1,
+		&max9867_right_dapm_control),
+	SND_SOC_DAPM_SWITCH("Line Mixer", SND_SOC_NOPM, 0, 0,
+		&max9867_line_dapm_control),
+	SND_SOC_DAPM_INPUT("LINE_IN"),
+};
+
+static const struct snd_soc_dapm_route max9867_audio_map[] = {
+	{"Left DAC", NULL, "DAI_OUT"},
+	{"Right DAC", NULL, "DAI_OUT"},
+	{"Output Mixer", NULL, "Left DAC"},
+	{"Output Mixer", NULL, "Right DAC"},
+	{"HPOUT", NULL, "Output Mixer"},
+
+	{"Left ADC", NULL, "DAI_IN"},
+	{"Right ADC", NULL, "DAI_IN"},
+	{"Input Mixer", NULL, "Left ADC"},
+	{"Input Mixer", NULL, "Right ADC"},
+	{"Input Mux", "Line", "Input Mixer"},
+	{"Input Mux", "Mic", "Input Mixer"},
+	{"Input Mux", "Mic_Line", "Input Mixer"},
+	{"Right Line", "Switch", "Input Mux"},
+	{"Left Line", "Switch", "Input Mux"},
+	{"LINE_IN", NULL, "Left Line"},
+	{"LINE_IN", NULL, "Right Line"},
+};
+
+enum rates {
+	pcm_rate_8, pcm_rate_16, pcm_rate_24,
+	pcm_rate_32, pcm_rate_44,
+	pcm_rate_48, max_pcm_rate,
+};
+
+static const struct ni_div_rates {
+	u32 mclk;
+	u16 ni[max_pcm_rate];
+} ni_div[] = {
+	{11289600, {0x116A, 0x22D4, 0x343F, 0x45A9, 0x6000, 0x687D} },
+	{12000000, {0x1062, 0x20C5, 0x3127, 0x4189, 0x5A51, 0x624E} },
+	{12288000, {0x1000, 0x2000, 0x3000, 0x4000, 0x5833, 0x6000} },
+	{13000000, {0x0F20, 0x1E3F, 0x2D5F, 0x3C7F, 0x535F, 0x5ABE} },
+	{19200000, {0x0A3D, 0x147B, 0x1EB8, 0x28F6, 0x3873, 0x3D71} },
+	{24000000, {0x1062, 0x20C5, 0x1893, 0x4189, 0x5A51, 0x624E} },
+	{26000000, {0x0F20, 0x1E3F, 0x16AF, 0x3C7F, 0x535F, 0x5ABE} },
+	{27000000, {0x0E90, 0x1D21, 0x15D8, 0x3A41, 0x5048, 0x5762} },
+};
+
+static inline int get_ni_value(int mclk, int rate)
+{
+	int i, ret = 0;
+
+	/* find the closest rate index*/
+	for (i = 0; i < ARRAY_SIZE(ni_div); i++) {
+		if (ni_div[i].mclk >= mclk)
+			break;
+	}
+	if (i == ARRAY_SIZE(ni_div))
+		return -EINVAL;
+
+	switch (rate) {
+	case 8000:
+		return ni_div[i].ni[pcm_rate_8];
+	case 16000:
+		return ni_div[i].ni[pcm_rate_16];
+	case 32000:
+		return ni_div[i].ni[pcm_rate_32];
+	case 44100:
+		return ni_div[i].ni[pcm_rate_44];
+	case 48000:
+		return ni_div[i].ni[pcm_rate_48];
+	default:
+		pr_err("%s wrong rate %d\n", __func__, rate);
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static int max9867_dai_hw_params(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
+	unsigned int ni_h, ni_l;
+	int value;
+
+	value = get_ni_value(max9867->sysclk, params_rate(params));
+	if (value < 0)
+		return value;
+
+	ni_h = (0xFF00 & value) >> 8;
+	ni_l = 0x00FF & value;
+	/* set up the ni value */
+	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
+		MAX9867_NI_HIGH_MASK, ni_h);
+	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
+		MAX9867_NI_LOW_MASK, ni_l);
+	if (!max9867->master) {
+		/*
+		 * digital pll locks on to any externally supplied LRCLK signal
+		 * and also enable rapid lock mode.
+		 */
+		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
+			MAX9867_RAPID_LOCK, MAX9867_RAPID_LOCK);
+		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
+			MAX9867_PLL, MAX9867_PLL);
+	} else {
+		unsigned long int bclk_rate, pclk_bclk_ratio;
+		int bclk_value;
+
+		bclk_rate = params_rate(params) * 2 * params_width(params);
+		pclk_bclk_ratio = max9867->pclk/bclk_rate;
+		switch (params_width(params)) {
+		case 8:
+		case 16:
+			switch (pclk_bclk_ratio) {
+			case 2:
+				bclk_value = MAX9867_IFC1B_PCLK_2;
+				break;
+			case 4:
+				bclk_value = MAX9867_IFC1B_PCLK_4;
+				break;
+			case 8:
+				bclk_value = MAX9867_IFC1B_PCLK_8;
+				break;
+			case 16:
+				bclk_value = MAX9867_IFC1B_PCLK_16;
+				break;
+			default:
+				dev_err(component->dev,
+					"unsupported sampling rate\n");
+				return -EINVAL;
+			}
+			break;
+		case 24:
+			bclk_value = MAX9867_IFC1B_24BIT;
+			break;
+		case 32:
+			bclk_value = MAX9867_IFC1B_32BIT;
+			break;
+		default:
+			dev_err(component->dev, "unsupported sampling rate\n");
+			return -EINVAL;
+		}
+		regmap_update_bits(max9867->regmap, MAX9867_IFC1B,
+			MAX9867_IFC1B_BCLK_MASK, bclk_value);
+	}
+	return 0;
+}
+
+static int max9867_mute(struct snd_soc_dai *dai, int mute)
+{
+	struct snd_soc_component *component = dai->component;
+	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
+
+	if (mute)
+		regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
+			MAX9867_DAC_MUTE_MASK, MAX9867_DAC_MUTE_MASK);
+	else
+		regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
+			MAX9867_DAC_MUTE_MASK, 0);
+	return 0;
+}
+
+static int max9867_set_dai_sysclk(struct snd_soc_dai *codec_dai,
+		int clk_id, unsigned int freq, int dir)
+{
+	struct snd_soc_component *component = codec_dai->component;
+	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
+	int value = 0;
+
+	/* Set the prescaler based on the master clock frequency*/
+	if (freq >= 10000000 && freq <= 20000000) {
+		value |= MAX9867_PSCLK_10_20;
+		max9867->pclk =  freq;
+	} else if (freq >= 20000000 && freq <= 40000000) {
+		value |= MAX9867_PSCLK_20_40;
+		max9867->pclk =  freq/2;
+	} else if (freq >= 40000000 && freq <= 60000000) {
+		value |= MAX9867_PSCLK_40_60;
+		max9867->pclk =  freq/4;
+	} else {
+		dev_err(component->dev,
+			"Invalid clock frequency %uHz (required 10-60MHz)\n",
+			freq);
+		return -EINVAL;
+	}
+	value = value << MAX9867_PSCLK_SHIFT;
+	max9867->sysclk = freq;
+	/* exact integer mode is not supported */
+	value &= ~MAX9867_FREQ_MASK;
+	regmap_update_bits(max9867->regmap, MAX9867_SYSCLK,
+			MAX9867_PSCLK_MASK, value);
+	return 0;
+}
+
+static int max9867_dai_set_fmt(struct snd_soc_dai *codec_dai,
+		unsigned int fmt)
+{
+	struct snd_soc_component *component = codec_dai->component;
+	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
+	u8 iface1A = 0, iface1B = 0;
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBM_CFM:
+		max9867->master = 1;
+		iface1A |= MAX9867_MASTER;
+		break;
+	case SND_SOC_DAIFMT_CBS_CFS:
+		max9867->master = 0;
+		iface1A &= ~MAX9867_MASTER;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		iface1A |= MAX9867_I2S_DLY;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		iface1A |= MAX9867_TDM_MODE | MAX9867_SDOUT_HIZ;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Clock inversion bits, BCI and WCI */
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		iface1A |= MAX9867_WCI_MODE | MAX9867_BCI_MODE;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		iface1A |= MAX9867_BCI_MODE;
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		iface1A |= MAX9867_WCI_MODE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	regmap_write(max9867->regmap, MAX9867_IFC1A, iface1A);
+	regmap_write(max9867->regmap, MAX9867_IFC1B, iface1B);
+	return 0;
+}
+
+static const struct snd_soc_dai_ops max9867_dai_ops = {
+	.set_fmt = max9867_dai_set_fmt,
+	.set_sysclk	= max9867_set_dai_sysclk,
+	.digital_mute	= max9867_mute,
+	.hw_params = max9867_dai_hw_params,
+};
+
+#define MAX9867_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
+	SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
+#define MAX9867_FORMATS (SNDRV_PCM_FMTBIT_S16_LE)
+
+static struct snd_soc_dai_driver max9867_dai[] = {
+	{
+	.name = "max9867-aif1",
+	.playback = {
+		.stream_name = "HiFi Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = MAX9867_RATES,
+		.formats = MAX9867_FORMATS,
+	},
+	.capture = {
+		.stream_name = "HiFi Capture",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = MAX9867_RATES,
+		.formats = MAX9867_FORMATS,
+	},
+	.ops = &max9867_dai_ops,
+	.symmetric_rates = 1,
+	}
+};
+
+#ifdef CONFIG_PM
+static int max9867_suspend(struct snd_soc_component *component)
+{
+	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_OFF);
+
+	return 0;
+}
+
+static int max9867_resume(struct snd_soc_component *component)
+{
+	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_STANDBY);
+
+	return 0;
+}
+#else
+#define max9867_suspend	NULL
+#define max9867_resume	NULL
+#endif
+
+static int max9867_set_bias_level(struct snd_soc_component *component,
+				  enum snd_soc_bias_level level)
+{
+	int err;
+	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
+
+	switch (level) {
+	case SND_SOC_BIAS_STANDBY:
+		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
+			err = regcache_sync(max9867->regmap);
+			if (err)
+				return err;
+
+			err = regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
+						 MAX9867_SHTDOWN, MAX9867_SHTDOWN);
+			if (err)
+				return err;
+		}
+		break;
+	case SND_SOC_BIAS_OFF:
+		err = regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
+					 MAX9867_SHTDOWN, 0);
+		if (err)
+			return err;
+
+		regcache_mark_dirty(max9867->regmap);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_component_driver max9867_component = {
+	.controls		= max9867_snd_controls,
+	.num_controls		= ARRAY_SIZE(max9867_snd_controls),
+	.dapm_routes		= max9867_audio_map,
+	.num_dapm_routes	= ARRAY_SIZE(max9867_audio_map),
+	.dapm_widgets		= max9867_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(max9867_dapm_widgets),
+	.suspend		= max9867_suspend,
+	.resume			= max9867_resume,
+	.set_bias_level		= max9867_set_bias_level,
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+	.non_legacy_dai_naming	= 1,
+};
+
+static bool max9867_volatile_register(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case MAX9867_STATUS:
+	case MAX9867_JACKSTATUS:
+	case MAX9867_AUXHIGH:
+	case MAX9867_AUXLOW:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct reg_default max9867_reg[] = {
+	{ 0x04, 0x00 },
+	{ 0x05, 0x00 },
+	{ 0x06, 0x00 },
+	{ 0x07, 0x00 },
+	{ 0x08, 0x00 },
+	{ 0x09, 0x00 },
+	{ 0x0A, 0x00 },
+	{ 0x0B, 0x00 },
+	{ 0x0C, 0x00 },
+	{ 0x0D, 0x00 },
+	{ 0x0E, 0x00 },
+	{ 0x0F, 0x00 },
+	{ 0x10, 0x00 },
+	{ 0x11, 0x00 },
+	{ 0x12, 0x00 },
+	{ 0x13, 0x00 },
+	{ 0x14, 0x00 },
+	{ 0x15, 0x00 },
+	{ 0x16, 0x00 },
+	{ 0x17, 0x00 },
+};
+
+static const struct regmap_config max9867_regmap = {
+	.reg_bits	= 8,
+	.val_bits	= 8,
+	.max_register	= MAX9867_REVISION,
+	.reg_defaults	= max9867_reg,
+	.num_reg_defaults = ARRAY_SIZE(max9867_reg),
+	.volatile_reg	= max9867_volatile_register,
+	.cache_type	= REGCACHE_RBTREE,
+};
+
+static int max9867_i2c_probe(struct i2c_client *i2c,
+		const struct i2c_device_id *id)
+{
+	struct max9867_priv *max9867;
+	int ret = 0, reg;
+
+	max9867 = devm_kzalloc(&i2c->dev,
+			sizeof(*max9867), GFP_KERNEL);
+	if (!max9867)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, max9867);
+	max9867->regmap = devm_regmap_init_i2c(i2c, &max9867_regmap);
+	if (IS_ERR(max9867->regmap)) {
+		ret = PTR_ERR(max9867->regmap);
+		dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
+		return ret;
+	}
+	ret = regmap_read(max9867->regmap,
+			MAX9867_REVISION, &reg);
+	if (ret < 0) {
+		dev_err(&i2c->dev, "Failed to read: %d\n", ret);
+		return ret;
+	}
+	dev_info(&i2c->dev, "device revision: %x\n", reg);
+	ret = devm_snd_soc_register_component(&i2c->dev, &max9867_component,
+			max9867_dai, ARRAY_SIZE(max9867_dai));
+	if (ret < 0) {
+		dev_err(&i2c->dev, "Failed to register component: %d\n", ret);
+		return ret;
+	}
+	return ret;
+}
+
+static const struct i2c_device_id max9867_i2c_id[] = {
+	{ "max9867", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, max9867_i2c_id);
+
+static const struct of_device_id max9867_of_match[] = {
+	{ .compatible = "maxim,max9867", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, max9867_of_match);
+
+static struct i2c_driver max9867_i2c_driver = {
+	.driver = {
+		.name = "max9867",
+		.of_match_table = of_match_ptr(max9867_of_match),
+	},
+	.probe  = max9867_i2c_probe,
+	.id_table = max9867_i2c_id,
+};
+
+module_i2c_driver(max9867_i2c_driver);
+
+MODULE_AUTHOR("anish kumar <yesanishhere@gmail.com>");
+MODULE_DESCRIPTION("ALSA SoC MAX9867 driver");
+MODULE_LICENSE("GPL");