drivers/mfd/ti_am335x_tscadc.c - kernel/msm-4.9 - Gitiles

 /*
  * TI Touch Screen / ADC MFD driver
  *
  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation version 2.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether express or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/regmap.h>
 #include <linux/mfd/core.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/sched.h>

 #include <linux/mfd/ti_am335x_tscadc.h>

 static const struct regmap_config tscadc_regmap_config = {
 	.name = "ti_tscadc",
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
 };

 void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tscadc, u32 val)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&tscadc->reg_lock, flags);
 	tscadc->reg_se_cache |= val;
 	if (tscadc->adc_waiting)
 		wake_up(&tscadc->reg_se_wait);
 	else if (!tscadc->adc_in_use)
 		regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);

 	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
 }
 EXPORT_SYMBOL_GPL(am335x_tsc_se_set_cache);

 static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tscadc)
 {
 	DEFINE_WAIT(wait);
 	u32 reg;

 	regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
 	if (reg & SEQ_STATUS) {
 		tscadc->adc_waiting = true;
 		prepare_to_wait(&tscadc->reg_se_wait, &wait,
 				TASK_UNINTERRUPTIBLE);
 		spin_unlock_irq(&tscadc->reg_lock);

 		schedule();

 		spin_lock_irq(&tscadc->reg_lock);
 		finish_wait(&tscadc->reg_se_wait, &wait);

 		/*
 		 * Sequencer should either be idle or
 		 * busy applying the charge step.
 		 */
 		regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
 		WARN_ON((reg & SEQ_STATUS) && !(reg & CHARGE_STEP));
 		tscadc->adc_waiting = false;
 	}
 	tscadc->adc_in_use = true;
 }

 void am335x_tsc_se_set_once(struct ti_tscadc_dev *tscadc, u32 val)
 {
 	spin_lock_irq(&tscadc->reg_lock);
 	am335x_tscadc_need_adc(tscadc);

 	regmap_write(tscadc->regmap, REG_SE, val);
 	spin_unlock_irq(&tscadc->reg_lock);
 }
 EXPORT_SYMBOL_GPL(am335x_tsc_se_set_once);

 void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tscadc)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&tscadc->reg_lock, flags);
 	tscadc->adc_in_use = false;
 	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
 	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
 }
 EXPORT_SYMBOL_GPL(am335x_tsc_se_adc_done);

 void am335x_tsc_se_clr(struct ti_tscadc_dev *tscadc, u32 val)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&tscadc->reg_lock, flags);
 	tscadc->reg_se_cache &= ~val;
 	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
 	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
 }
 EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);

 static void tscadc_idle_config(struct ti_tscadc_dev *tscadc)
 {
 	unsigned int idleconfig;

 	idleconfig = STEPCONFIG_YNN | STEPCONFIG_INM_ADCREFM |
 			STEPCONFIG_INP_ADCREFM | STEPCONFIG_YPN;

 	regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig);
 }

 static	int ti_tscadc_probe(struct platform_device *pdev)
 {
 	struct ti_tscadc_dev	*tscadc;
 	struct resource		*res;
 	struct clk		*clk;
 	struct device_node	*node = pdev->dev.of_node;
 	struct mfd_cell		*cell;
 	struct property         *prop;
 	const __be32            *cur;
 	u32			val;
 	int			err, ctrl;
 	int			clock_rate;
 	int			tsc_wires = 0, adc_channels = 0, total_channels;
 	int			readouts = 0;

 	if (!pdev->dev.of_node) {
 		dev_err(&pdev->dev, "Could not find valid DT data.\n");
 		return -EINVAL;
 	}

 	node = of_get_child_by_name(pdev->dev.of_node, "tsc");
 	of_property_read_u32(node, "ti,wires", &tsc_wires);
 	of_property_read_u32(node, "ti,coordiante-readouts", &readouts);

 	node = of_get_child_by_name(pdev->dev.of_node, "adc");
 	of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
 		adc_channels++;
 		if (val > 7) {
 			dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",
 					val);
 			return -EINVAL;
 		}
 	}
 	total_channels = tsc_wires + adc_channels;
 	if (total_channels > 8) {
 		dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
 		return -EINVAL;
 	}
 	if (total_channels == 0) {
 		dev_err(&pdev->dev, "Need atleast one channel.\n");
 		return -EINVAL;
 	}

 	if (readouts * 2 + 2 + adc_channels > 16) {
 		dev_err(&pdev->dev, "Too many step configurations requested\n");
 		return -EINVAL;
 	}

 	/* Allocate memory for device */
 	tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL);
 	if (!tscadc) {
 		dev_err(&pdev->dev, "failed to allocate memory.\n");
 		return -ENOMEM;
 	}
 	tscadc->dev = &pdev->dev;

 	err = platform_get_irq(pdev, 0);
 	if (err < 0) {
 		dev_err(&pdev->dev, "no irq ID is specified.\n");
 		goto ret;
 	} else
 		tscadc->irq = err;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	tscadc->tscadc_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(tscadc->tscadc_base))
 		return PTR_ERR(tscadc->tscadc_base);

 	tscadc->regmap = devm_regmap_init_mmio(&pdev->dev,
 			tscadc->tscadc_base, &tscadc_regmap_config);
 	if (IS_ERR(tscadc->regmap)) {
 		dev_err(&pdev->dev, "regmap init failed\n");
 		err = PTR_ERR(tscadc->regmap);
 		goto ret;
 	}

 	spin_lock_init(&tscadc->reg_lock);
 	init_waitqueue_head(&tscadc->reg_se_wait);

 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_get_sync(&pdev->dev);

 	/*
 	 * The TSC_ADC_Subsystem has 2 clock domains
 	 * OCP_CLK and ADC_CLK.
 	 * The ADC clock is expected to run at target of 3MHz,
 	 * and expected to capture 12-bit data at a rate of 200 KSPS.
 	 * The TSC_ADC_SS controller design assumes the OCP clock is
 	 * at least 6x faster than the ADC clock.
 	 */
 	clk = clk_get(&pdev->dev, "adc_tsc_fck");
 	if (IS_ERR(clk)) {
 		dev_err(&pdev->dev, "failed to get TSC fck\n");
 		err = PTR_ERR(clk);
 		goto err_disable_clk;
 	}
 	clock_rate = clk_get_rate(clk);
 	clk_put(clk);
 	tscadc->clk_div = clock_rate / ADC_CLK;

 	/* TSCADC_CLKDIV needs to be configured to the value minus 1 */
 	tscadc->clk_div--;
 	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);

 	/* Set the control register bits */
 	ctrl = CNTRLREG_STEPCONFIGWRT |	CNTRLREG_STEPID;
 	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

 	/* Set register bits for Idle Config Mode */
 	if (tsc_wires > 0) {
 		tscadc->tsc_wires = tsc_wires;
 		if (tsc_wires == 5)
 			ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;
 		else
 			ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
 		tscadc_idle_config(tscadc);
 	}

 	/* Enable the TSC module enable bit */
 	ctrl |= CNTRLREG_TSCSSENB;
 	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

 	tscadc->used_cells = 0;
 	tscadc->tsc_cell = -1;
 	tscadc->adc_cell = -1;

 	/* TSC Cell */
 	if (tsc_wires > 0) {
 		tscadc->tsc_cell = tscadc->used_cells;
 		cell = &tscadc->cells[tscadc->used_cells++];
 		cell->name = "TI-am335x-tsc";
 		cell->of_compatible = "ti,am3359-tsc";
 		cell->platform_data = &tscadc;
 		cell->pdata_size = sizeof(tscadc);
 	}

 	/* ADC Cell */
 	if (adc_channels > 0) {
 		tscadc->adc_cell = tscadc->used_cells;
 		cell = &tscadc->cells[tscadc->used_cells++];
 		cell->name = "TI-am335x-adc";
 		cell->of_compatible = "ti,am3359-adc";
 		cell->platform_data = &tscadc;
 		cell->pdata_size = sizeof(tscadc);
 	}

 	err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
 			tscadc->used_cells, NULL, 0, NULL);
 	if (err < 0)
 		goto err_disable_clk;

 	device_init_wakeup(&pdev->dev, true);
 	platform_set_drvdata(pdev, tscadc);
 	return 0;

 err_disable_clk:
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 ret:
 	return err;
 }

 static int ti_tscadc_remove(struct platform_device *pdev)
 {
 	struct ti_tscadc_dev	*tscadc = platform_get_drvdata(pdev);

 	regmap_write(tscadc->regmap, REG_SE, 0x00);

 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);

 	mfd_remove_devices(tscadc->dev);

 	return 0;
 }

 static int __maybe_unused tscadc_suspend(struct device *dev)
 {
 	struct ti_tscadc_dev	*tscadc = dev_get_drvdata(dev);

 	regmap_write(tscadc->regmap, REG_SE, 0x00);
 	pm_runtime_put_sync(dev);

 	return 0;
 }

 static int __maybe_unused tscadc_resume(struct device *dev)
 {
 	struct ti_tscadc_dev	*tscadc = dev_get_drvdata(dev);
 	u32 ctrl;

 	pm_runtime_get_sync(dev);

 	/* context restore */
 	ctrl = CNTRLREG_STEPCONFIGWRT |	CNTRLREG_STEPID;
 	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

 	if (tscadc->tsc_cell != -1) {
 		if (tscadc->tsc_wires == 5)
 			ctrl |= CNTRLREG_5WIRE | CNTRLREG_TSCENB;
 		else
 			ctrl |= CNTRLREG_4WIRE | CNTRLREG_TSCENB;
 		tscadc_idle_config(tscadc);
 	}
 	ctrl |= CNTRLREG_TSCSSENB;
 	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

 	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);

 	return 0;
 }

 static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume);

 static const struct of_device_id ti_tscadc_dt_ids[] = {
 	{ .compatible = "ti,am3359-tscadc", },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);

 static struct platform_driver ti_tscadc_driver = {
 	.driver = {
 		.name   = "ti_am3359-tscadc",
 		.pm	= &tscadc_pm_ops,
 		.of_match_table = ti_tscadc_dt_ids,
 	},
 	.probe	= ti_tscadc_probe,
 	.remove	= ti_tscadc_remove,

 };

 module_platform_driver(ti_tscadc_driver);

 MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver");
 MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
 MODULE_LICENSE("GPL");
	/*
	* TI Touch Screen / ADC MFD driver
	*
	* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation version 2.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether express or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/clk.h>
	#include <linux/regmap.h>
	#include <linux/mfd/core.h>
	#include <linux/pm_runtime.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/sched.h>

	#include <linux/mfd/ti_am335x_tscadc.h>

	static const struct regmap_config tscadc_regmap_config = {
	.name = "ti_tscadc",
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	};

	void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tscadc, u32 val)
	{
	unsigned long flags;

	spin_lock_irqsave(&tscadc->reg_lock, flags);
	tscadc->reg_se_cache \|= val;
	if (tscadc->adc_waiting)
	wake_up(&tscadc->reg_se_wait);
	else if (!tscadc->adc_in_use)
	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);

	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
	}
	EXPORT_SYMBOL_GPL(am335x_tsc_se_set_cache);

	static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tscadc)
	{
	DEFINE_WAIT(wait);
	u32 reg;

	regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
	if (reg & SEQ_STATUS) {
	tscadc->adc_waiting = true;
	prepare_to_wait(&tscadc->reg_se_wait, &wait,
	TASK_UNINTERRUPTIBLE);
	spin_unlock_irq(&tscadc->reg_lock);

	schedule();

	spin_lock_irq(&tscadc->reg_lock);
	finish_wait(&tscadc->reg_se_wait, &wait);

	/*
	* Sequencer should either be idle or
	* busy applying the charge step.
	*/
	regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
	WARN_ON((reg & SEQ_STATUS) && !(reg & CHARGE_STEP));
	tscadc->adc_waiting = false;
	}
	tscadc->adc_in_use = true;
	}

	void am335x_tsc_se_set_once(struct ti_tscadc_dev *tscadc, u32 val)
	{
	spin_lock_irq(&tscadc->reg_lock);
	am335x_tscadc_need_adc(tscadc);

	regmap_write(tscadc->regmap, REG_SE, val);
	spin_unlock_irq(&tscadc->reg_lock);
	}
	EXPORT_SYMBOL_GPL(am335x_tsc_se_set_once);

	void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tscadc)
	{
	unsigned long flags;

	spin_lock_irqsave(&tscadc->reg_lock, flags);
	tscadc->adc_in_use = false;
	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
	}
	EXPORT_SYMBOL_GPL(am335x_tsc_se_adc_done);

	void am335x_tsc_se_clr(struct ti_tscadc_dev *tscadc, u32 val)
	{
	unsigned long flags;

	spin_lock_irqsave(&tscadc->reg_lock, flags);
	tscadc->reg_se_cache &= ~val;
	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
	}
	EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);

	static void tscadc_idle_config(struct ti_tscadc_dev *tscadc)
	{
	unsigned int idleconfig;

	idleconfig = STEPCONFIG_YNN \| STEPCONFIG_INM_ADCREFM \|
	STEPCONFIG_INP_ADCREFM \| STEPCONFIG_YPN;

	regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig);
	}

	static int ti_tscadc_probe(struct platform_device *pdev)
	{
	struct ti_tscadc_dev *tscadc;
	struct resource *res;
	struct clk *clk;
	struct device_node *node = pdev->dev.of_node;
	struct mfd_cell *cell;
	struct property *prop;
	const __be32 *cur;
	u32 val;
	int err, ctrl;
	int clock_rate;
	int tsc_wires = 0, adc_channels = 0, total_channels;
	int readouts = 0;

	if (!pdev->dev.of_node) {
	dev_err(&pdev->dev, "Could not find valid DT data.\n");
	return -EINVAL;
	}

	node = of_get_child_by_name(pdev->dev.of_node, "tsc");
	of_property_read_u32(node, "ti,wires", &tsc_wires);
	of_property_read_u32(node, "ti,coordiante-readouts", &readouts);

	node = of_get_child_by_name(pdev->dev.of_node, "adc");
	of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) {
	adc_channels++;
	if (val > 7) {
	dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n",
	val);
	return -EINVAL;
	}
	}
	total_channels = tsc_wires + adc_channels;
	if (total_channels > 8) {
	dev_err(&pdev->dev, "Number of i/p channels more than 8\n");
	return -EINVAL;
	}
	if (total_channels == 0) {
	dev_err(&pdev->dev, "Need atleast one channel.\n");
	return -EINVAL;
	}

	if (readouts * 2 + 2 + adc_channels > 16) {
	dev_err(&pdev->dev, "Too many step configurations requested\n");
	return -EINVAL;
	}

	/* Allocate memory for device */
	tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL);
	if (!tscadc) {
	dev_err(&pdev->dev, "failed to allocate memory.\n");
	return -ENOMEM;
	}
	tscadc->dev = &pdev->dev;

	err = platform_get_irq(pdev, 0);
	if (err < 0) {
	dev_err(&pdev->dev, "no irq ID is specified.\n");
	goto ret;
	} else
	tscadc->irq = err;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	tscadc->tscadc_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(tscadc->tscadc_base))
	return PTR_ERR(tscadc->tscadc_base);

	tscadc->regmap = devm_regmap_init_mmio(&pdev->dev,
	tscadc->tscadc_base, &tscadc_regmap_config);
	if (IS_ERR(tscadc->regmap)) {
	dev_err(&pdev->dev, "regmap init failed\n");
	err = PTR_ERR(tscadc->regmap);
	goto ret;
	}

	spin_lock_init(&tscadc->reg_lock);
	init_waitqueue_head(&tscadc->reg_se_wait);

	pm_runtime_enable(&pdev->dev);
	pm_runtime_get_sync(&pdev->dev);

	/*
	* The TSC_ADC_Subsystem has 2 clock domains
	* OCP_CLK and ADC_CLK.
	* The ADC clock is expected to run at target of 3MHz,
	* and expected to capture 12-bit data at a rate of 200 KSPS.
	* The TSC_ADC_SS controller design assumes the OCP clock is
	* at least 6x faster than the ADC clock.
	*/
	clk = clk_get(&pdev->dev, "adc_tsc_fck");
	if (IS_ERR(clk)) {
	dev_err(&pdev->dev, "failed to get TSC fck\n");
	err = PTR_ERR(clk);
	goto err_disable_clk;
	}
	clock_rate = clk_get_rate(clk);
	clk_put(clk);
	tscadc->clk_div = clock_rate / ADC_CLK;

	/* TSCADC_CLKDIV needs to be configured to the value minus 1 */
	tscadc->clk_div--;
	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);

	/* Set the control register bits */
	ctrl = CNTRLREG_STEPCONFIGWRT \| CNTRLREG_STEPID;
	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

	/* Set register bits for Idle Config Mode */
	if (tsc_wires > 0) {
	tscadc->tsc_wires = tsc_wires;
	if (tsc_wires == 5)
	ctrl \|= CNTRLREG_5WIRE \| CNTRLREG_TSCENB;
	else
	ctrl \|= CNTRLREG_4WIRE \| CNTRLREG_TSCENB;
	tscadc_idle_config(tscadc);
	}

	/* Enable the TSC module enable bit */
	ctrl \|= CNTRLREG_TSCSSENB;
	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

	tscadc->used_cells = 0;
	tscadc->tsc_cell = -1;
	tscadc->adc_cell = -1;

	/* TSC Cell */
	if (tsc_wires > 0) {
	tscadc->tsc_cell = tscadc->used_cells;
	cell = &tscadc->cells[tscadc->used_cells++];
	cell->name = "TI-am335x-tsc";
	cell->of_compatible = "ti,am3359-tsc";
	cell->platform_data = &tscadc;
	cell->pdata_size = sizeof(tscadc);
	}

	/* ADC Cell */
	if (adc_channels > 0) {
	tscadc->adc_cell = tscadc->used_cells;
	cell = &tscadc->cells[tscadc->used_cells++];
	cell->name = "TI-am335x-adc";
	cell->of_compatible = "ti,am3359-adc";
	cell->platform_data = &tscadc;
	cell->pdata_size = sizeof(tscadc);
	}

	err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
	tscadc->used_cells, NULL, 0, NULL);
	if (err < 0)
	goto err_disable_clk;

	device_init_wakeup(&pdev->dev, true);
	platform_set_drvdata(pdev, tscadc);
	return 0;

	err_disable_clk:
	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);
	ret:
	return err;
	}

	static int ti_tscadc_remove(struct platform_device *pdev)
	{
	struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev);

	regmap_write(tscadc->regmap, REG_SE, 0x00);

	pm_runtime_put_sync(&pdev->dev);
	pm_runtime_disable(&pdev->dev);

	mfd_remove_devices(tscadc->dev);

	return 0;
	}

	static int __maybe_unused tscadc_suspend(struct device *dev)
	{
	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);

	regmap_write(tscadc->regmap, REG_SE, 0x00);
	pm_runtime_put_sync(dev);

	return 0;
	}

	static int __maybe_unused tscadc_resume(struct device *dev)
	{
	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);
	u32 ctrl;

	pm_runtime_get_sync(dev);

	/* context restore */
	ctrl = CNTRLREG_STEPCONFIGWRT \| CNTRLREG_STEPID;
	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

	if (tscadc->tsc_cell != -1) {
	if (tscadc->tsc_wires == 5)
	ctrl \|= CNTRLREG_5WIRE \| CNTRLREG_TSCENB;
	else
	ctrl \|= CNTRLREG_4WIRE \| CNTRLREG_TSCENB;
	tscadc_idle_config(tscadc);
	}
	ctrl \|= CNTRLREG_TSCSSENB;
	regmap_write(tscadc->regmap, REG_CTRL, ctrl);

	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);

	return 0;
	}

	static SIMPLE_DEV_PM_OPS(tscadc_pm_ops, tscadc_suspend, tscadc_resume);

	static const struct of_device_id ti_tscadc_dt_ids[] = {
	{ .compatible = "ti,am3359-tscadc", },
	{ }
	};
	MODULE_DEVICE_TABLE(of, ti_tscadc_dt_ids);

	static struct platform_driver ti_tscadc_driver = {
	.driver = {
	.name = "ti_am3359-tscadc",
	.pm = &tscadc_pm_ops,
	.of_match_table = ti_tscadc_dt_ids,
	},
	.probe = ti_tscadc_probe,
	.remove = ti_tscadc_remove,

	};

	module_platform_driver(ti_tscadc_driver);

	MODULE_DESCRIPTION("TI touchscreen / ADC MFD controller driver");
	MODULE_AUTHOR("Rachna Patil <rachna@ti.com>");
	MODULE_LICENSE("GPL");