sound/soc/codecs/tas2770-regmap.c - manifest_repos/kernel - Git at Google

 /*
  * ALSA SoC Texas Instruments TAS2770 20-W Digital Input Mono Class-D
  * Audio Amplifier with Speaker I/V Sense
  *
  * Copyright (C) 2016 Texas Instruments, Inc.
  *
  * Author: saiprasad
  *
  * This package 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.
  *
  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
  */
 #ifdef CONFIG_TAS2770_REGMAP

 #define DEBUG
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/gpio.h>
 #include <linux/regulator/consumer.h>
 #include <linux/firmware.h>
 #include <linux/regmap.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/slab.h>
 #include <sound/soc.h>

 #include "tas2770.h"
 #include "tas2770-codec.h"

 static const struct reg_default tas2770_reg_defaults[] = {
 	{ TAS2770_Page, 0x00 },
 	{ TAS2770_SoftwareReset, 0x00 },
 	{ TAS2770_PowerControl, 0x0e },
 	{ TAS2770_PlaybackConfigurationReg0, 0x10 },
 	{ TAS2770_PlaybackConfigurationReg1, 0x01 },
 	{ TAS2770_PlaybackConfigurationReg2, 0x00 },
 	{ TAS2770_MiscConfigurationReg0, 0x07 },
 	{ TAS2770_TDMConfigurationReg1, 0x02 },
 	{ TAS2770_TDMConfigurationReg2, 0x0a },
 	{ TAS2770_TDMConfigurationReg3, 0x10 },
 	{ TAS2770_InterruptMaskReg0, 0xfc },
 	{ TAS2770_InterruptMaskReg1, 0xb1 },
 	{ TAS2770_InterruptConfiguration, 0x05 },
 	{ TAS2770_MiscIRQ, 0x81 },
 	{ TAS2770_ClockConfiguration, 0x0c },

 };

 static bool tas2770_volatile(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case TAS2770_Page: /* regmap implementation requires this */
 	case TAS2770_SoftwareReset: /* always clears after write */
 	case TAS2770_BrownOutPreventionReg0:/* has a self clearing bit */
 	case TAS2770_LiveInterruptReg0:
 	case TAS2770_LiveInterruptReg1:
 	case TAS2770_LatchedInterruptReg0:/* Sticky interrupt flags */
 	case TAS2770_LatchedInterruptReg1:/* Sticky interrupt flags */
 	case TAS2770_VBATMSB:
 	case TAS2770_VBATLSB:
 	case TAS2770_TEMPMSB:
 	case TAS2770_TEMPLSB:
 		return true;
 	}
 	return false;
 }

 static bool tas2770_writeable(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case TAS2770_LiveInterruptReg0:
 	case TAS2770_LiveInterruptReg1:
 	case TAS2770_LatchedInterruptReg0:
 	case TAS2770_LatchedInterruptReg1:
 	case TAS2770_VBATMSB:
 	case TAS2770_VBATLSB:
 	case TAS2770_TEMPMSB:
 	case TAS2770_TEMPLSB:
 	case TAS2770_TDMClockdetectionmonitor:
 	case TAS2770_RevisionandPGID:
 		return false;
 	}
 	return true;
 }
 static const struct regmap_config tas2770_i2c_regmap = {
 	.reg_bits = 8,
 	.val_bits = 8,
 	.writeable_reg = tas2770_writeable,
 	.volatile_reg = tas2770_volatile,
 	.reg_defaults = tas2770_reg_defaults,
 	.num_reg_defaults = ARRAY_SIZE(tas2770_reg_defaults),
 	.cache_type = REGCACHE_RBTREE,
 	.max_register = 1 * 128,
 };


 static void tas2770_hw_reset(struct tas2770_priv *pTAS2770)
 {
 	if (gpio_is_valid(pTAS2770->mnResetGPIO)) {
 		gpio_direction_output(pTAS2770->mnResetGPIO, 0);
 		msleep(5);
 		gpio_direction_output(pTAS2770->mnResetGPIO, 1);
 		msleep(2);
 	}

 	pTAS2770->mnCurrentBook = -1;
 	pTAS2770->mnCurrentPage = -1;
 }

 void tas2770_enableIRQ(struct tas2770_priv *pTAS2770, bool enable)
 {
 	if (enable) {
 		if (pTAS2770->mbIRQEnable)
 			return;

 		if (gpio_is_valid(pTAS2770->mnIRQGPIO))
 			enable_irq(pTAS2770->mnIRQ);

 		schedule_delayed_work(&pTAS2770->irq_work, msecs_to_jiffies(10));
 		pTAS2770->mbIRQEnable = true;
 	} else {
 		if (!pTAS2770->mbIRQEnable)
 			return;

 		if (gpio_is_valid(pTAS2770->mnIRQGPIO))
 			disable_irq_nosync(pTAS2770->mnIRQ);
 		pTAS2770->mbIRQEnable = false;
 	}
 }

 static void irq_work_routine(struct work_struct *work)
 {
 	struct tas2770_priv *pTAS2770 =
 		container_of(work, struct tas2770_priv, irq_work.work);

 #ifdef CONFIG_TAS2770_CODEC
 	mutex_lock(&pTAS2770->codec_lock);
 #endif

 	if (pTAS2770->mbRuntimeSuspend) {
 		dev_info(pTAS2770->dev, "%s, Runtime Suspended\n", __func__);
 		goto end;
 	}

 	if (!pTAS2770->mbPowerUp) {
 		dev_info(pTAS2770->dev, "%s, device not powered\n", __func__);
 		goto end;
 	}

 end:
 #ifdef CONFIG_TAS2770_CODEC
 	mutex_unlock(&pTAS2770->codec_lock);
 #endif
 }

 static enum hrtimer_restart timer_func(struct hrtimer *timer)
 {
 	struct tas2770_priv *pTAS2770 = container_of(timer,
 		struct tas2770_priv, mtimer);

 	if (pTAS2770->mbPowerUp) {
 		if (!delayed_work_pending(&pTAS2770->irq_work))
 			schedule_delayed_work(&pTAS2770->irq_work,
 				msecs_to_jiffies(20));
 	}

 	return HRTIMER_NORESTART;
 }

 static irqreturn_t tas2770_irq_handler(int irq, void *dev_id)
 {
 	struct tas2770_priv *pTAS2770 = (struct tas2770_priv *)dev_id;

 	tas2770_enableIRQ(pTAS2770, false);

 	/* get IRQ status after 100 ms */
 	if (!delayed_work_pending(&pTAS2770->irq_work))
 		schedule_delayed_work(&pTAS2770->irq_work,
 			msecs_to_jiffies(100));

 	return IRQ_HANDLED;
 }

 static int tas2770_runtime_suspend(struct tas2770_priv *pTAS2770)
 {
 	dev_dbg(pTAS2770->dev, "%s\n", __func__);

 	pTAS2770->mbRuntimeSuspend = true;

 	if (hrtimer_active(&pTAS2770->mtimer)) {
 		dev_dbg(pTAS2770->dev, "cancel die temp timer\n");
 		hrtimer_cancel(&pTAS2770->mtimer);
 	}

 	if (delayed_work_pending(&pTAS2770->irq_work)) {
 		dev_dbg(pTAS2770->dev, "cancel IRQ work\n");
 		cancel_delayed_work_sync(&pTAS2770->irq_work);
 	}

 	return 0;
 }

 #define CHECK_PERIOD	5000	/* 5 second */
 static int tas2770_runtime_resume(struct tas2770_priv *pTAS2770)
 {
 	dev_dbg(pTAS2770->dev, "%s\n", __func__);

 	if (pTAS2770->mbPowerUp) {
 		if (!hrtimer_active(&pTAS2770->mtimer)) {
 			hrtimer_start(&pTAS2770->mtimer,
 				ns_to_ktime((u64)CHECK_PERIOD * NSEC_PER_MSEC),
 				HRTIMER_MODE_REL);
 		}

 	}

 	pTAS2770->mbRuntimeSuspend = false;

 	return 0;
 }

 static int tas2770_parse_dt(struct device *dev, struct tas2770_priv *pTAS2770)
 {
 	struct device_node *np = dev->of_node;
 	int rc = 0, ret = 0;

 	rc = of_property_read_u32(np, "ti,asi-format", &pTAS2770->mnASIFormat);
 	if (rc) {
 		dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
 			"ti,asi-format", np->full_name, rc);
 	} else {
 		dev_dbg(pTAS2770->dev, "ti,asi-format=%d",
 			pTAS2770->mnASIFormat);
 	}

 	pTAS2770->mnResetGPIO = of_get_named_gpio(np, "ti,reset-gpio", 0);
 	if (!gpio_is_valid(pTAS2770->mnResetGPIO)) {
 		dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
 			"ti,reset-gpio", np->full_name, pTAS2770->mnResetGPIO);
 	} else {
 		dev_dbg(pTAS2770->dev, "ti,reset-gpio=%d",
 			pTAS2770->mnResetGPIO);
 	}

 	pTAS2770->mnIRQGPIO = of_get_named_gpio(np, "ti,irq-gpio", 0);
 	if (!gpio_is_valid(pTAS2770->mnIRQGPIO)) {
 		dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
 			"ti,irq-gpio", np->full_name, pTAS2770->mnIRQGPIO);
 	} else {
 		dev_dbg(pTAS2770->dev, "ti,irq-gpio=%d", pTAS2770->mnIRQGPIO);
 	}

 	of_property_read_u32(np, "ti,left-slot", &pTAS2770->mnLeftSlot);
 	if (rc) {
 		dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
 			"ti,left-slot", np->full_name, rc);
 	} else {
 		dev_dbg(pTAS2770->dev, "ti,left-slot=%d",
 			pTAS2770->mnLeftSlot);
 	}

 	of_property_read_u32(np, "ti,right-slot", &pTAS2770->mnRightSlot);
 	if (rc) {
 		dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
 			"ti,right-slot", np->full_name, rc);
 	} else {
 		dev_dbg(pTAS2770->dev, "ti,right-slot=%d",
 			pTAS2770->mnRightSlot);
 	}

 	of_property_read_u32(np, "ti,imon-slot-no", &pTAS2770->mnImon_slot_no);
 	if (rc) {
 		dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
 			"ti,imon-slot-no", np->full_name, rc);
 	} else {
 		dev_dbg(pTAS2770->dev, "ti,imon-slot-no=%d",
 			pTAS2770->mnImon_slot_no);
 	}

 	of_property_read_u32(np, "ti,vmon-slot-no", &pTAS2770->mnVmon_slot_no);
 	if (rc) {
 		dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
 			"ti,vmon-slot-no", np->full_name, rc);
 	} else {
 		dev_dbg(pTAS2770->dev, "ti,vmon-slot-no=%d",
 			pTAS2770->mnVmon_slot_no);
 	}

 	return ret;
 }

 static int tas2770_i2c_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct tas2770_priv *pTAS2770;
 	int nResult;

 	dev_info(&client->dev, "%s enter\n", __func__);

 	pTAS2770 = devm_kzalloc(&client->dev,
 		sizeof(struct tas2770_priv), GFP_KERNEL);
 	if (pTAS2770 == NULL) {
 		nResult = -ENOMEM;
 		goto end;
 	}

 	pTAS2770->dev = &client->dev;
 	i2c_set_clientdata(client, pTAS2770);
 	dev_set_drvdata(&client->dev, pTAS2770);

 	pTAS2770->regmap = devm_regmap_init_i2c(client, &tas2770_i2c_regmap);
 	if (IS_ERR(pTAS2770->regmap)) {
 		nResult = PTR_ERR(pTAS2770->regmap);
 		dev_err(&client->dev, "Failed to allocate register map: %d\n",
 					nResult);
 		goto end;
 	}

 	if (client->dev.of_node)
 		tas2770_parse_dt(&client->dev, pTAS2770);

 	if (gpio_is_valid(pTAS2770->mnResetGPIO)) {
 		nResult = gpio_request(pTAS2770->mnResetGPIO, "TAS2770_RESET");
 		if (nResult) {
 			dev_err(pTAS2770->dev, "%s: Failed to request gpio %d\n",
 				__func__, pTAS2770->mnResetGPIO);
 			nResult = -EINVAL;
 			goto free_gpio;
 		}
 	}

 	if (gpio_is_valid(pTAS2770->mnIRQGPIO)) {
 		nResult = gpio_request(pTAS2770->mnIRQGPIO, "TAS2770-IRQ");
 		if (nResult < 0) {
 			dev_err(pTAS2770->dev, "%s: GPIO %d request error\n",
 				__func__, pTAS2770->mnIRQGPIO);
 			goto free_gpio;
 		}
 		gpio_direction_input(pTAS2770->mnIRQGPIO);
 		pTAS2770->mnIRQ = gpio_to_irq(pTAS2770->mnIRQGPIO);
 		dev_dbg(pTAS2770->dev, "irq = %d\n", pTAS2770->mnIRQ);
 		nResult = request_threaded_irq(pTAS2770->mnIRQ,
 					tas2770_irq_handler, NULL,
 					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 					client->name, pTAS2770);
 		if (nResult < 0) {
 			dev_err(pTAS2770->dev,
 				"request_irq failed, %d\n", nResult);
 			goto free_gpio;
 		}
 		disable_irq_nosync(pTAS2770->mnIRQ);
 		INIT_DELAYED_WORK(&pTAS2770->irq_work, irq_work_routine);
 	}

 	pTAS2770->hw_reset = tas2770_hw_reset;
 	pTAS2770->enableIRQ = tas2770_enableIRQ;
 	pTAS2770->runtime_suspend = tas2770_runtime_suspend;
 	pTAS2770->runtime_resume = tas2770_runtime_resume;
 	pTAS2770->mnCh_size = 0;
 	pTAS2770->mnSlot_width = 0;

 	tas2770_hw_reset(pTAS2770);
 	regmap_write(pTAS2770->regmap, TAS2770_SoftwareReset,
 			TAS2770_SoftwareReset_SoftwareReset_Reset);

 	mutex_init(&pTAS2770->dev_lock);
 	if (nResult < 0)
 		goto destroy_mutex;

 #ifdef CONFIG_TAS2770_CODEC
 	mutex_init(&pTAS2770->codec_lock);
 	tas2770_register_codec(pTAS2770);
 #endif

 	hrtimer_init(&pTAS2770->mtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	pTAS2770->mtimer.function = timer_func;

 destroy_mutex:
 	if (nResult < 0)
 		mutex_destroy(&pTAS2770->dev_lock);

 free_gpio:
 	if (nResult < 0) {
 		if (gpio_is_valid(pTAS2770->mnResetGPIO))
 			gpio_free(pTAS2770->mnResetGPIO);
 		if (gpio_is_valid(pTAS2770->mnIRQGPIO))
 			gpio_free(pTAS2770->mnIRQGPIO);
 	}

 end:
 	return nResult;
 }

 static int tas2770_i2c_remove(struct i2c_client *client)
 {
 	struct tas2770_priv *pTAS2770 = i2c_get_clientdata(client);

 	dev_info(pTAS2770->dev, "%s\n", __func__);

 #ifdef CONFIG_TAS2770_CODEC
 	tas2770_deregister_codec(pTAS2770);
 	mutex_destroy(&pTAS2770->codec_lock);
 #endif

 	if (gpio_is_valid(pTAS2770->mnResetGPIO))
 		gpio_free(pTAS2770->mnResetGPIO);
 	if (gpio_is_valid(pTAS2770->mnIRQGPIO))
 		gpio_free(pTAS2770->mnIRQGPIO);

 	return 0;
 }


 static const struct i2c_device_id tas2770_i2c_id[] = {
 	{ "tas2770", 0},
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tas2770_i2c_id);

 #if defined(CONFIG_OF)
 static const struct of_device_id tas2770_of_match[] = {
 	{ .compatible = "ti,tas2770" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, tas2770_of_match);
 #endif


 static struct i2c_driver tas2770_i2c_driver = {
 	.driver = {
 		.name   = "tas2770",
 		.owner  = THIS_MODULE,
 #if defined(CONFIG_OF)
 		.of_match_table = of_match_ptr(tas2770_of_match),
 #endif
 	},
 	.probe      = tas2770_i2c_probe,
 	.remove     = tas2770_i2c_remove,
 	.id_table   = tas2770_i2c_id,
 };

 module_i2c_driver(tas2770_i2c_driver);

 MODULE_AUTHOR("Texas Instruments Inc.");
 MODULE_DESCRIPTION("TAS2770 I2C Smart Amplifier driver");
 MODULE_LICENSE("GPL v2");
 #endif
	/*
	* ALSA SoC Texas Instruments TAS2770 20-W Digital Input Mono Class-D
	* Audio Amplifier with Speaker I/V Sense
	*
	* Copyright (C) 2016 Texas Instruments, Inc.
	*
	* Author: saiprasad
	*
	* This package 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.
	*
	* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	*
	*/
	#ifdef CONFIG_TAS2770_REGMAP

	#define DEBUG
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/err.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/pm.h>
	#include <linux/i2c.h>
	#include <linux/gpio.h>
	#include <linux/regulator/consumer.h>
	#include <linux/firmware.h>
	#include <linux/regmap.h>
	#include <linux/of.h>
	#include <linux/of_gpio.h>
	#include <linux/slab.h>
	#include <sound/soc.h>

	#include "tas2770.h"
	#include "tas2770-codec.h"

	static const struct reg_default tas2770_reg_defaults[] = {
	{ TAS2770_Page, 0x00 },
	{ TAS2770_SoftwareReset, 0x00 },
	{ TAS2770_PowerControl, 0x0e },
	{ TAS2770_PlaybackConfigurationReg0, 0x10 },
	{ TAS2770_PlaybackConfigurationReg1, 0x01 },
	{ TAS2770_PlaybackConfigurationReg2, 0x00 },
	{ TAS2770_MiscConfigurationReg0, 0x07 },
	{ TAS2770_TDMConfigurationReg1, 0x02 },
	{ TAS2770_TDMConfigurationReg2, 0x0a },
	{ TAS2770_TDMConfigurationReg3, 0x10 },
	{ TAS2770_InterruptMaskReg0, 0xfc },
	{ TAS2770_InterruptMaskReg1, 0xb1 },
	{ TAS2770_InterruptConfiguration, 0x05 },
	{ TAS2770_MiscIRQ, 0x81 },
	{ TAS2770_ClockConfiguration, 0x0c },

	};

	static bool tas2770_volatile(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case TAS2770_Page: /* regmap implementation requires this */
	case TAS2770_SoftwareReset: /* always clears after write */
	case TAS2770_BrownOutPreventionReg0:/* has a self clearing bit */
	case TAS2770_LiveInterruptReg0:
	case TAS2770_LiveInterruptReg1:
	case TAS2770_LatchedInterruptReg0:/* Sticky interrupt flags */
	case TAS2770_LatchedInterruptReg1:/* Sticky interrupt flags */
	case TAS2770_VBATMSB:
	case TAS2770_VBATLSB:
	case TAS2770_TEMPMSB:
	case TAS2770_TEMPLSB:
	return true;
	}
	return false;
	}

	static bool tas2770_writeable(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case TAS2770_LiveInterruptReg0:
	case TAS2770_LiveInterruptReg1:
	case TAS2770_LatchedInterruptReg0:
	case TAS2770_LatchedInterruptReg1:
	case TAS2770_VBATMSB:
	case TAS2770_VBATLSB:
	case TAS2770_TEMPMSB:
	case TAS2770_TEMPLSB:
	case TAS2770_TDMClockdetectionmonitor:
	case TAS2770_RevisionandPGID:
	return false;
	}
	return true;
	}
	static const struct regmap_config tas2770_i2c_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.writeable_reg = tas2770_writeable,
	.volatile_reg = tas2770_volatile,
	.reg_defaults = tas2770_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(tas2770_reg_defaults),
	.cache_type = REGCACHE_RBTREE,
	.max_register = 1 * 128,
	};


	static void tas2770_hw_reset(struct tas2770_priv *pTAS2770)
	{
	if (gpio_is_valid(pTAS2770->mnResetGPIO)) {
	gpio_direction_output(pTAS2770->mnResetGPIO, 0);
	msleep(5);
	gpio_direction_output(pTAS2770->mnResetGPIO, 1);
	msleep(2);
	}

	pTAS2770->mnCurrentBook = -1;
	pTAS2770->mnCurrentPage = -1;
	}

	void tas2770_enableIRQ(struct tas2770_priv *pTAS2770, bool enable)
	{
	if (enable) {
	if (pTAS2770->mbIRQEnable)
	return;

	if (gpio_is_valid(pTAS2770->mnIRQGPIO))
	enable_irq(pTAS2770->mnIRQ);

	schedule_delayed_work(&pTAS2770->irq_work, msecs_to_jiffies(10));
	pTAS2770->mbIRQEnable = true;
	} else {
	if (!pTAS2770->mbIRQEnable)
	return;

	if (gpio_is_valid(pTAS2770->mnIRQGPIO))
	disable_irq_nosync(pTAS2770->mnIRQ);
	pTAS2770->mbIRQEnable = false;
	}
	}

	static void irq_work_routine(struct work_struct *work)
	{
	struct tas2770_priv *pTAS2770 =
	container_of(work, struct tas2770_priv, irq_work.work);

	#ifdef CONFIG_TAS2770_CODEC
	mutex_lock(&pTAS2770->codec_lock);
	#endif

	if (pTAS2770->mbRuntimeSuspend) {
	dev_info(pTAS2770->dev, "%s, Runtime Suspended\n", __func__);
	goto end;
	}

	if (!pTAS2770->mbPowerUp) {
	dev_info(pTAS2770->dev, "%s, device not powered\n", __func__);
	goto end;
	}

	end:
	#ifdef CONFIG_TAS2770_CODEC
	mutex_unlock(&pTAS2770->codec_lock);
	#endif
	}

	static enum hrtimer_restart timer_func(struct hrtimer *timer)
	{
	struct tas2770_priv *pTAS2770 = container_of(timer,
	struct tas2770_priv, mtimer);

	if (pTAS2770->mbPowerUp) {
	if (!delayed_work_pending(&pTAS2770->irq_work))
	schedule_delayed_work(&pTAS2770->irq_work,
	msecs_to_jiffies(20));
	}

	return HRTIMER_NORESTART;
	}

	static irqreturn_t tas2770_irq_handler(int irq, void *dev_id)
	{
	struct tas2770_priv pTAS2770 = (struct tas2770_priv )dev_id;

	tas2770_enableIRQ(pTAS2770, false);

	/* get IRQ status after 100 ms */
	if (!delayed_work_pending(&pTAS2770->irq_work))
	schedule_delayed_work(&pTAS2770->irq_work,
	msecs_to_jiffies(100));

	return IRQ_HANDLED;
	}

	static int tas2770_runtime_suspend(struct tas2770_priv *pTAS2770)
	{
	dev_dbg(pTAS2770->dev, "%s\n", __func__);

	pTAS2770->mbRuntimeSuspend = true;

	if (hrtimer_active(&pTAS2770->mtimer)) {
	dev_dbg(pTAS2770->dev, "cancel die temp timer\n");
	hrtimer_cancel(&pTAS2770->mtimer);
	}

	if (delayed_work_pending(&pTAS2770->irq_work)) {
	dev_dbg(pTAS2770->dev, "cancel IRQ work\n");
	cancel_delayed_work_sync(&pTAS2770->irq_work);
	}

	return 0;
	}

	#define CHECK_PERIOD 5000 /* 5 second */
	static int tas2770_runtime_resume(struct tas2770_priv *pTAS2770)
	{
	dev_dbg(pTAS2770->dev, "%s\n", __func__);

	if (pTAS2770->mbPowerUp) {
	if (!hrtimer_active(&pTAS2770->mtimer)) {
	hrtimer_start(&pTAS2770->mtimer,
	ns_to_ktime((u64)CHECK_PERIOD * NSEC_PER_MSEC),
	HRTIMER_MODE_REL);
	}

	}

	pTAS2770->mbRuntimeSuspend = false;

	return 0;
	}

	static int tas2770_parse_dt(struct device dev, struct tas2770_priv pTAS2770)
	{
	struct device_node *np = dev->of_node;
	int rc = 0, ret = 0;

	rc = of_property_read_u32(np, "ti,asi-format", &pTAS2770->mnASIFormat);
	if (rc) {
	dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
	"ti,asi-format", np->full_name, rc);
	} else {
	dev_dbg(pTAS2770->dev, "ti,asi-format=%d",
	pTAS2770->mnASIFormat);
	}

	pTAS2770->mnResetGPIO = of_get_named_gpio(np, "ti,reset-gpio", 0);
	if (!gpio_is_valid(pTAS2770->mnResetGPIO)) {
	dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
	"ti,reset-gpio", np->full_name, pTAS2770->mnResetGPIO);
	} else {
	dev_dbg(pTAS2770->dev, "ti,reset-gpio=%d",
	pTAS2770->mnResetGPIO);
	}

	pTAS2770->mnIRQGPIO = of_get_named_gpio(np, "ti,irq-gpio", 0);
	if (!gpio_is_valid(pTAS2770->mnIRQGPIO)) {
	dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
	"ti,irq-gpio", np->full_name, pTAS2770->mnIRQGPIO);
	} else {
	dev_dbg(pTAS2770->dev, "ti,irq-gpio=%d", pTAS2770->mnIRQGPIO);
	}

	of_property_read_u32(np, "ti,left-slot", &pTAS2770->mnLeftSlot);
	if (rc) {
	dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
	"ti,left-slot", np->full_name, rc);
	} else {
	dev_dbg(pTAS2770->dev, "ti,left-slot=%d",
	pTAS2770->mnLeftSlot);
	}

	of_property_read_u32(np, "ti,right-slot", &pTAS2770->mnRightSlot);
	if (rc) {
	dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
	"ti,right-slot", np->full_name, rc);
	} else {
	dev_dbg(pTAS2770->dev, "ti,right-slot=%d",
	pTAS2770->mnRightSlot);
	}

	of_property_read_u32(np, "ti,imon-slot-no", &pTAS2770->mnImon_slot_no);
	if (rc) {
	dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
	"ti,imon-slot-no", np->full_name, rc);
	} else {
	dev_dbg(pTAS2770->dev, "ti,imon-slot-no=%d",
	pTAS2770->mnImon_slot_no);
	}

	of_property_read_u32(np, "ti,vmon-slot-no", &pTAS2770->mnVmon_slot_no);
	if (rc) {
	dev_err(pTAS2770->dev, "Looking up %s property in node %s failed %d\n",
	"ti,vmon-slot-no", np->full_name, rc);
	} else {
	dev_dbg(pTAS2770->dev, "ti,vmon-slot-no=%d",
	pTAS2770->mnVmon_slot_no);
	}

	return ret;
	}

	static int tas2770_i2c_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct tas2770_priv *pTAS2770;
	int nResult;

	dev_info(&client->dev, "%s enter\n", __func__);

	pTAS2770 = devm_kzalloc(&client->dev,
	sizeof(struct tas2770_priv), GFP_KERNEL);
	if (pTAS2770 == NULL) {
	nResult = -ENOMEM;
	goto end;
	}

	pTAS2770->dev = &client->dev;
	i2c_set_clientdata(client, pTAS2770);
	dev_set_drvdata(&client->dev, pTAS2770);

	pTAS2770->regmap = devm_regmap_init_i2c(client, &tas2770_i2c_regmap);
	if (IS_ERR(pTAS2770->regmap)) {
	nResult = PTR_ERR(pTAS2770->regmap);
	dev_err(&client->dev, "Failed to allocate register map: %d\n",
	nResult);
	goto end;
	}

	if (client->dev.of_node)
	tas2770_parse_dt(&client->dev, pTAS2770);

	if (gpio_is_valid(pTAS2770->mnResetGPIO)) {
	nResult = gpio_request(pTAS2770->mnResetGPIO, "TAS2770_RESET");
	if (nResult) {
	dev_err(pTAS2770->dev, "%s: Failed to request gpio %d\n",
	__func__, pTAS2770->mnResetGPIO);
	nResult = -EINVAL;
	goto free_gpio;
	}
	}

	if (gpio_is_valid(pTAS2770->mnIRQGPIO)) {
	nResult = gpio_request(pTAS2770->mnIRQGPIO, "TAS2770-IRQ");
	if (nResult < 0) {
	dev_err(pTAS2770->dev, "%s: GPIO %d request error\n",
	__func__, pTAS2770->mnIRQGPIO);
	goto free_gpio;
	}
	gpio_direction_input(pTAS2770->mnIRQGPIO);
	pTAS2770->mnIRQ = gpio_to_irq(pTAS2770->mnIRQGPIO);
	dev_dbg(pTAS2770->dev, "irq = %d\n", pTAS2770->mnIRQ);
	nResult = request_threaded_irq(pTAS2770->mnIRQ,
	tas2770_irq_handler, NULL,
	IRQF_TRIGGER_HIGH \| IRQF_ONESHOT,
	client->name, pTAS2770);
	if (nResult < 0) {
	dev_err(pTAS2770->dev,
	"request_irq failed, %d\n", nResult);
	goto free_gpio;
	}
	disable_irq_nosync(pTAS2770->mnIRQ);
	INIT_DELAYED_WORK(&pTAS2770->irq_work, irq_work_routine);
	}

	pTAS2770->hw_reset = tas2770_hw_reset;
	pTAS2770->enableIRQ = tas2770_enableIRQ;
	pTAS2770->runtime_suspend = tas2770_runtime_suspend;
	pTAS2770->runtime_resume = tas2770_runtime_resume;
	pTAS2770->mnCh_size = 0;
	pTAS2770->mnSlot_width = 0;

	tas2770_hw_reset(pTAS2770);
	regmap_write(pTAS2770->regmap, TAS2770_SoftwareReset,
	TAS2770_SoftwareReset_SoftwareReset_Reset);

	mutex_init(&pTAS2770->dev_lock);
	if (nResult < 0)
	goto destroy_mutex;

	#ifdef CONFIG_TAS2770_CODEC
	mutex_init(&pTAS2770->codec_lock);
	tas2770_register_codec(pTAS2770);
	#endif

	hrtimer_init(&pTAS2770->mtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	pTAS2770->mtimer.function = timer_func;

	destroy_mutex:
	if (nResult < 0)
	mutex_destroy(&pTAS2770->dev_lock);

	free_gpio:
	if (nResult < 0) {
	if (gpio_is_valid(pTAS2770->mnResetGPIO))
	gpio_free(pTAS2770->mnResetGPIO);
	if (gpio_is_valid(pTAS2770->mnIRQGPIO))
	gpio_free(pTAS2770->mnIRQGPIO);
	}

	end:
	return nResult;
	}

	static int tas2770_i2c_remove(struct i2c_client *client)
	{
	struct tas2770_priv *pTAS2770 = i2c_get_clientdata(client);

	dev_info(pTAS2770->dev, "%s\n", __func__);

	#ifdef CONFIG_TAS2770_CODEC
	tas2770_deregister_codec(pTAS2770);
	mutex_destroy(&pTAS2770->codec_lock);
	#endif

	if (gpio_is_valid(pTAS2770->mnResetGPIO))
	gpio_free(pTAS2770->mnResetGPIO);
	if (gpio_is_valid(pTAS2770->mnIRQGPIO))
	gpio_free(pTAS2770->mnIRQGPIO);

	return 0;
	}


	static const struct i2c_device_id tas2770_i2c_id[] = {
	{ "tas2770", 0},
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, tas2770_i2c_id);

	#if defined(CONFIG_OF)
	static const struct of_device_id tas2770_of_match[] = {
	{ .compatible = "ti,tas2770" },
	{},
	};
	MODULE_DEVICE_TABLE(of, tas2770_of_match);
	#endif


	static struct i2c_driver tas2770_i2c_driver = {
	.driver = {
	.name = "tas2770",
	.owner = THIS_MODULE,
	#if defined(CONFIG_OF)
	.of_match_table = of_match_ptr(tas2770_of_match),
	#endif
	},
	.probe = tas2770_i2c_probe,
	.remove = tas2770_i2c_remove,
	.id_table = tas2770_i2c_id,
	};

	module_i2c_driver(tas2770_i2c_driver);

	MODULE_AUTHOR("Texas Instruments Inc.");
	MODULE_DESCRIPTION("TAS2770 I2C Smart Amplifier driver");
	MODULE_LICENSE("GPL v2");
	#endif