drivers/regulator/bd9571mwv-regulator.c - linux - Git at Google

 /*
  * ROHM BD9571MWV-M regulator driver
  *
  * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
  *
  * 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.
  *
  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  * kind, whether expressed or implied; without even the implied warranty
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License version 2 for more details.
  *
  * Based on the TPS65086 driver
  *
  * NOTE: VD09 is missing
  */

 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>

 #include <linux/mfd/bd9571mwv.h>

 struct bd9571mwv_reg {
 	struct bd9571mwv *bd;

 	/* DDR Backup Power */
 	u8 bkup_mode_cnt_keepon;	/* from "rohm,ddr-backup-power" */
 	u8 bkup_mode_cnt_saved;
 	bool bkup_mode_enabled;

 	/* Power switch type */
 	bool rstbmode_level;
 	bool rstbmode_pulse;
 };

 enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };

 #define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
 	{							\
 		.name			= _name,		\
 		.of_match		= of_match_ptr(_of),	\
 		.regulators_node	= "regulators",		\
 		.id			= _id,			\
 		.ops			= &_ops,		\
 		.n_voltages		= _nv,			\
 		.type			= REGULATOR_VOLTAGE,	\
 		.owner			= THIS_MODULE,		\
 		.vsel_reg		= _vr,			\
 		.vsel_mask		= _vm,			\
 		.min_uV			= _min,			\
 		.uV_step		= _step,		\
 		.linear_min_sel		= _lmin,		\
 	}

 static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
 {
 	unsigned int val;
 	int ret;

 	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
 	if (ret != 0)
 		return ret;

 	return val & BD9571MWV_AVS_SET_MONI_MASK;
 }

 static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
 						unsigned int sel)
 {
 	int ret;

 	ret = bd9571mwv_avs_get_moni_state(rdev);
 	if (ret < 0)
 		return ret;

 	return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
 				 rdev->desc->vsel_mask, sel);
 }

 static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
 {
 	unsigned int val;
 	int ret;

 	ret = bd9571mwv_avs_get_moni_state(rdev);
 	if (ret < 0)
 		return ret;

 	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
 	if (ret != 0)
 		return ret;

 	val &= rdev->desc->vsel_mask;
 	val >>= ffs(rdev->desc->vsel_mask) - 1;

 	return val;
 }

 static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
 						unsigned int sel)
 {
 	return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
 				 rdev->desc->vsel_mask, sel);
 }

 /* Operations permitted on AVS voltage regulator */
 static struct regulator_ops avs_ops = {
 	.set_voltage_sel	= bd9571mwv_avs_set_voltage_sel_regmap,
 	.map_voltage		= regulator_map_voltage_linear,
 	.get_voltage_sel	= bd9571mwv_avs_get_voltage_sel_regmap,
 	.list_voltage		= regulator_list_voltage_linear,
 };

 /* Operations permitted on voltage regulators */
 static struct regulator_ops reg_ops = {
 	.set_voltage_sel	= bd9571mwv_reg_set_voltage_sel_regmap,
 	.map_voltage		= regulator_map_voltage_linear,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.list_voltage		= regulator_list_voltage_linear,
 };

 /* Operations permitted on voltage monitors */
 static struct regulator_ops vid_ops = {
 	.map_voltage		= regulator_map_voltage_linear,
 	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 	.list_voltage		= regulator_list_voltage_linear,
 };

 static struct regulator_desc regulators[] = {
 	BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
 		      0x80, 600000, 10000, 0x3c),
 	BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
 		      16, 1625000, 25000, 0),
 	BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
 		      16, 2150000, 50000, 0),
 	BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
 		      11, 2800000, 100000, 0),
 	BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
 		      BD9571MWV_DVFS_MONIVDAC, 0x7f,
 		      0x80, 600000, 10000, 0x3c),
 };

 #ifdef CONFIG_PM_SLEEP
 static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode)
 {
 	int ret;

 	ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
 	if (ret) {
 		dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
 {
 	int ret;

 	ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
 	if (ret) {
 		dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
 			mode, ret);
 		return ret;
 	}

 	return 0;
 }

 static ssize_t backup_mode_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

 	return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
 }

 static ssize_t backup_mode_store(struct device *dev,
 				 struct device_attribute *attr,
 				 const char *buf, size_t count)
 {
 	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
 	unsigned int mode;
 	int ret;

 	if (!count)
 		return 0;

 	ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
 	if (ret)
 		return ret;

 	if (!bdreg->rstbmode_level)
 		return count;

 	/*
 	 * Configure DDR Backup Mode, to change the role of the accessory power
 	 * switch from a power switch to a wake-up switch, or vice versa
 	 */
 	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
 	if (ret)
 		return ret;

 	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
 	if (bdreg->bkup_mode_enabled)
 		mode |= bdreg->bkup_mode_cnt_keepon;

 	ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode);
 	if (ret)
 		return ret;

 	return count;
 }

 static DEVICE_ATTR_RW(backup_mode);

 static int bd9571mwv_suspend(struct device *dev)
 {
 	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
 	unsigned int mode;
 	int ret;

 	if (!bdreg->bkup_mode_enabled)
 		return 0;

 	/* Save DDR Backup Mode */
 	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
 	if (ret)
 		return ret;

 	bdreg->bkup_mode_cnt_saved = mode;

 	if (!bdreg->rstbmode_pulse)
 		return 0;

 	/* Enable DDR Backup Mode */
 	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
 	mode |= bdreg->bkup_mode_cnt_keepon;

 	if (mode != bdreg->bkup_mode_cnt_saved)
 		return bd9571mwv_bkup_mode_write(bdreg->bd, mode);

 	return 0;
 }

 static int bd9571mwv_resume(struct device *dev)
 {
 	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

 	if (!bdreg->bkup_mode_enabled)
 		return 0;

 	/* Restore DDR Backup Mode */
 	return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
 }

 static const struct dev_pm_ops bd9571mwv_pm  = {
 	SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
 };

 static int bd9571mwv_regulator_remove(struct platform_device *pdev)
 {
 	device_remove_file(&pdev->dev, &dev_attr_backup_mode);
 	return 0;
 }
 #define DEV_PM_OPS	&bd9571mwv_pm
 #else
 #define DEV_PM_OPS	NULL
 #define bd9571mwv_regulator_remove	NULL
 #endif /* CONFIG_PM_SLEEP */

 static int bd9571mwv_regulator_probe(struct platform_device *pdev)
 {
 	struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
 	struct regulator_config config = { };
 	struct bd9571mwv_reg *bdreg;
 	struct regulator_dev *rdev;
 	unsigned int val;
 	int i;

 	bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
 	if (!bdreg)
 		return -ENOMEM;

 	bdreg->bd = bd;

 	platform_set_drvdata(pdev, bdreg);

 	config.dev = &pdev->dev;
 	config.dev->of_node = bd->dev->of_node;
 	config.driver_data = bd;
 	config.regmap = bd->regmap;

 	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
 					       &config);
 		if (IS_ERR(rdev)) {
 			dev_err(bd->dev, "failed to register %s regulator\n",
 				pdev->name);
 			return PTR_ERR(rdev);
 		}
 	}

 	val = 0;
 	of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
 	if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
 		dev_err(bd->dev, "invalid %s mode %u\n",
 			"rohm,ddr-backup-power", val);
 		return -EINVAL;
 	}
 	bdreg->bkup_mode_cnt_keepon = val;

 	bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
 						      "rohm,rstbmode-level");
 	bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
 						      "rohm,rstbmode-pulse");
 	if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
 		dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
 		return -EINVAL;
 	}

 #ifdef CONFIG_PM_SLEEP
 	if (bdreg->bkup_mode_cnt_keepon) {
 		int ret;

 		/*
 		 * Backup mode is enabled by default in pulse mode, but needs
 		 * explicit user setup in level mode.
 		 */
 		bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;

 		ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
 		if (ret)
 			return ret;
 	}
 #endif /* CONFIG_PM_SLEEP */

 	return 0;
 }

 static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
 	{ "bd9571mwv-regulator", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);

 static struct platform_driver bd9571mwv_regulator_driver = {
 	.driver = {
 		.name = "bd9571mwv-regulator",
 		.pm = DEV_PM_OPS,
 	},
 	.probe = bd9571mwv_regulator_probe,
 	.remove = bd9571mwv_regulator_remove,
 	.id_table = bd9571mwv_regulator_id_table,
 };
 module_platform_driver(bd9571mwv_regulator_driver);

 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
 MODULE_DESCRIPTION("BD9571MWV Regulator driver");
 MODULE_LICENSE("GPL v2");
	/*
	* ROHM BD9571MWV-M regulator driver
	*
	* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
	*
	* 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.
	*
	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	* kind, whether expressed or implied; without even the implied warranty
	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License version 2 for more details.
	*
	* Based on the TPS65086 driver
	*
	* NOTE: VD09 is missing
	*/

	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>

	#include <linux/mfd/bd9571mwv.h>

	struct bd9571mwv_reg {
	struct bd9571mwv *bd;

	/* DDR Backup Power */
	u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
	u8 bkup_mode_cnt_saved;
	bool bkup_mode_enabled;

	/* Power switch type */
	bool rstbmode_level;
	bool rstbmode_pulse;
	};

	enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };

	#define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
	{ \
	.name = _name, \
	.of_match = of_match_ptr(_of), \
	.regulators_node = "regulators", \
	.id = _id, \
	.ops = &_ops, \
	.n_voltages = _nv, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.vsel_reg = _vr, \
	.vsel_mask = _vm, \
	.min_uV = _min, \
	.uV_step = _step, \
	.linear_min_sel = _lmin, \
	}

	static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
	{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
	if (ret != 0)
	return ret;

	return val & BD9571MWV_AVS_SET_MONI_MASK;
	}

	static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
	unsigned int sel)
	{
	int ret;

	ret = bd9571mwv_avs_get_moni_state(rdev);
	if (ret < 0)
	return ret;

	return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
	rdev->desc->vsel_mask, sel);
	}

	static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
	{
	unsigned int val;
	int ret;

	ret = bd9571mwv_avs_get_moni_state(rdev);
	if (ret < 0)
	return ret;

	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
	if (ret != 0)
	return ret;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	return val;
	}

	static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
	unsigned int sel)
	{
	return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
	rdev->desc->vsel_mask, sel);
	}

	/* Operations permitted on AVS voltage regulator */
	static struct regulator_ops avs_ops = {
	.set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	};

	/* Operations permitted on voltage regulators */
	static struct regulator_ops reg_ops = {
	.set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	};

	/* Operations permitted on voltage monitors */
	static struct regulator_ops vid_ops = {
	.map_voltage = regulator_map_voltage_linear,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = regulator_list_voltage_linear,
	};

	static struct regulator_desc regulators[] = {
	BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
	0x80, 600000, 10000, 0x3c),
	BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
	16, 1625000, 25000, 0),
	BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
	16, 2150000, 50000, 0),
	BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
	11, 2800000, 100000, 0),
	BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
	BD9571MWV_DVFS_MONIVDAC, 0x7f,
	0x80, 600000, 10000, 0x3c),
	};

	#ifdef CONFIG_PM_SLEEP
	static int bd9571mwv_bkup_mode_read(struct bd9571mwv bd, unsigned int mode)
	{
	int ret;

	ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	if (ret) {
	dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
	return ret;
	}

	return 0;
	}

	static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
	{
	int ret;

	ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	if (ret) {
	dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
	mode, ret);
	return ret;
	}

	return 0;
	}

	static ssize_t backup_mode_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
	}

	static ssize_t backup_mode_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	if (!count)
	return 0;

	ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
	if (ret)
	return ret;

	if (!bdreg->rstbmode_level)
	return count;

	/*
	* Configure DDR Backup Mode, to change the role of the accessory power
	* switch from a power switch to a wake-up switch, or vice versa
	*/
	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
	if (ret)
	return ret;

	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	if (bdreg->bkup_mode_enabled)
	mode \|= bdreg->bkup_mode_cnt_keepon;

	ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode);
	if (ret)
	return ret;

	return count;
	}

	static DEVICE_ATTR_RW(backup_mode);

	static int bd9571mwv_suspend(struct device *dev)
	{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	if (!bdreg->bkup_mode_enabled)
	return 0;

	/* Save DDR Backup Mode */
	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
	if (ret)
	return ret;

	bdreg->bkup_mode_cnt_saved = mode;

	if (!bdreg->rstbmode_pulse)
	return 0;

	/* Enable DDR Backup Mode */
	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	mode \|= bdreg->bkup_mode_cnt_keepon;

	if (mode != bdreg->bkup_mode_cnt_saved)
	return bd9571mwv_bkup_mode_write(bdreg->bd, mode);

	return 0;
	}

	static int bd9571mwv_resume(struct device *dev)
	{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

	if (!bdreg->bkup_mode_enabled)
	return 0;

	/* Restore DDR Backup Mode */
	return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
	}

	static const struct dev_pm_ops bd9571mwv_pm = {
	SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
	};

	static int bd9571mwv_regulator_remove(struct platform_device *pdev)
	{
	device_remove_file(&pdev->dev, &dev_attr_backup_mode);
	return 0;
	}
	#define DEV_PM_OPS &bd9571mwv_pm
	#else
	#define DEV_PM_OPS NULL
	#define bd9571mwv_regulator_remove NULL
	#endif /* CONFIG_PM_SLEEP */

	static int bd9571mwv_regulator_probe(struct platform_device *pdev)
	{
	struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = { };
	struct bd9571mwv_reg *bdreg;
	struct regulator_dev *rdev;
	unsigned int val;
	int i;

	bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
	if (!bdreg)
	return -ENOMEM;

	bdreg->bd = bd;

	platform_set_drvdata(pdev, bdreg);

	config.dev = &pdev->dev;
	config.dev->of_node = bd->dev->of_node;
	config.driver_data = bd;
	config.regmap = bd->regmap;

	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
	rdev = devm_regulator_register(&pdev->dev, &regulators[i],
	&config);
	if (IS_ERR(rdev)) {
	dev_err(bd->dev, "failed to register %s regulator\n",
	pdev->name);
	return PTR_ERR(rdev);
	}
	}

	val = 0;
	of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
	if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
	dev_err(bd->dev, "invalid %s mode %u\n",
	"rohm,ddr-backup-power", val);
	return -EINVAL;
	}
	bdreg->bkup_mode_cnt_keepon = val;

	bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
	"rohm,rstbmode-level");
	bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
	"rohm,rstbmode-pulse");
	if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
	dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
	return -EINVAL;
	}

	#ifdef CONFIG_PM_SLEEP
	if (bdreg->bkup_mode_cnt_keepon) {
	int ret;

	/*
	* Backup mode is enabled by default in pulse mode, but needs
	* explicit user setup in level mode.
	*/
	bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;

	ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
	if (ret)
	return ret;
	}
	#endif /* CONFIG_PM_SLEEP */

	return 0;
	}

	static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
	{ "bd9571mwv-regulator", },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);

	static struct platform_driver bd9571mwv_regulator_driver = {
	.driver = {
	.name = "bd9571mwv-regulator",
	.pm = DEV_PM_OPS,
	},
	.probe = bd9571mwv_regulator_probe,
	.remove = bd9571mwv_regulator_remove,
	.id_table = bd9571mwv_regulator_id_table,
	};
	module_platform_driver(bd9571mwv_regulator_driver);

	MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
	MODULE_DESCRIPTION("BD9571MWV Regulator driver");
	MODULE_LICENSE("GPL v2");