Commit 42f24d9d authored by Mayulong's avatar Mayulong Committed by Greg Kroah-Hartman
Browse files

staging: regulator: add a regulator driver for HiSilicon 6421v600 SPMI PMIC 

Add the regulator driver for the LDO lines provided by the
HiSilicon 6421v600 SPMI PMIC device.

[mchehab+huawei@kernel.org: keep just the regulator driver on this patch,
 renaming it to better fit at upstream namespace]

The compete patch is at:
	https://github.com/96boards-hikey/linux/commit/08464419fba2



Signed-off-by: default avatarMayulong <mayulong1@huawei.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/6e5f6a811edf77575ddaa84ab6542cc646024423.1597647359.git.mchehab+huawei@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6b946699

drivers/staging/hikey9xx/hi6421v600-regulator.c

0 → 100644
+741 −0
Original line number Diff line number Diff line 
/*

 * Device driver for regulators in Hisi IC

 *

 * Copyright (c) 2013 Linaro Ltd.

 * Copyright (c) 2011 Hisilicon.

 *

 * Guodong Xu <guodong.xu@linaro.org>

 *

 * 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 in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 */



#include <linux/slab.h>

#include <linux/device.h>

#include <linux/module.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/platform_device.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/of_address.h>

#include <linux/regmap.h>

#include <linux/regulator/driver.h>

#include <linux/regulator/machine.h>

#include <linux/regulator/of_regulator.h>

#include <linux/mfd/hisi_pmic.h>

#include <linux/delay.h>

#include <linux/time.h>

#include <linux/version.h>

#ifdef CONFIG_HISI_PMIC_DEBUG

#include <linux/debugfs.h>

#endif

#include <linux/seq_file.h>

#include <linux/uaccess.h>

#include <linux/spmi.h>



#if 1

#define BRAND_DEBUG(args...) pr_debug(args);

#else

#define BRAND_DEBUG(args...)

#endif



struct hisi_regulator_register_info {

	u32 ctrl_reg;

	u32 enable_mask;

	u32 eco_mode_mask;

	u32 vset_reg;

	u32 vset_mask;

};



struct hisi_regulator {

	const char *name;

	struct hisi_regulator_register_info register_info;

	struct timeval last_off_time;

	u32 off_on_delay;

	u32 eco_uA;

	struct regulator_desc rdesc;

	int (*dt_parse)(struct hisi_regulator *, struct spmi_device *);

};



static DEFINE_MUTEX(enable_mutex);

struct timeval last_enabled;





static inline struct hisi_pmic *rdev_to_pmic(struct regulator_dev *dev)

{

	/* regulator_dev parent to->

	 * hisi regulator platform device_dev parent to->

	 * hisi pmic platform device_dev

	 */

	return dev_get_drvdata(rdev_get_dev(dev)->parent->parent);

}



/* helper function to ensure when it returns it is at least 'delay_us'

 * microseconds after 'since'.

 */

static void ensured_time_after(struct timeval since, u32 delay_us)

{

	struct timeval now;

	u64 elapsed_ns64, delay_ns64;

	u32 actual_us32;



	delay_ns64 = delay_us * NSEC_PER_USEC;

	do_gettimeofday(&now);

	elapsed_ns64 = timeval_to_ns(&now) - timeval_to_ns(&since);

	if (delay_ns64 > elapsed_ns64) {

		actual_us32 = ((u32)(delay_ns64 - elapsed_ns64) /

							NSEC_PER_USEC);

		if (actual_us32 >= 1000) {

			mdelay(actual_us32 / 1000); /*lint !e647 */

			udelay(actual_us32 % 1000);

		} else if (actual_us32 > 0) {

			udelay(actual_us32);

		}

	}

	return;

}



static int hisi_regulator_is_enabled(struct regulator_dev *dev)

{

	u32 reg_val;

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);

	struct hisi_pmic *pmic = rdev_to_pmic(dev);



	reg_val = hisi_pmic_read(pmic, sreg->register_info.ctrl_reg);

	BRAND_DEBUG("<[%s]: ctrl_reg=0x%x,enable_state=%d>\n", __func__, sreg->register_info.ctrl_reg,\

			(reg_val & sreg->register_info.enable_mask));



	return ((reg_val & sreg->register_info.enable_mask) != 0);

}



static int hisi_regulator_enable(struct regulator_dev *dev)

{

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);

	struct hisi_pmic *pmic = rdev_to_pmic(dev);



	/* keep a distance of off_on_delay from last time disabled */

	ensured_time_after(sreg->last_off_time, sreg->off_on_delay);



	BRAND_DEBUG("<[%s]: off_on_delay=%dus>\n", __func__, sreg->off_on_delay);



	/* cannot enable more than one regulator at one time */

	mutex_lock(&enable_mutex);

	ensured_time_after(last_enabled, HISI_REGS_ENA_PROTECT_TIME);



	/* set enable register */

	hisi_pmic_rmw(pmic, sreg->register_info.ctrl_reg,

				sreg->register_info.enable_mask,

				sreg->register_info.enable_mask);

	BRAND_DEBUG("<[%s]: ctrl_reg=0x%x,enable_mask=0x%x>\n", __func__, sreg->register_info.ctrl_reg,\

			sreg->register_info.enable_mask);



	do_gettimeofday(&last_enabled);

	mutex_unlock(&enable_mutex);



	return 0;

}



static int hisi_regulator_disable(struct regulator_dev *dev)

{

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);

	struct hisi_pmic *pmic = rdev_to_pmic(dev);



	/* set enable register to 0 */

	hisi_pmic_rmw(pmic, sreg->register_info.ctrl_reg,

				sreg->register_info.enable_mask, 0);



	do_gettimeofday(&sreg->last_off_time);



	return 0;

}



static int hisi_regulator_get_voltage(struct regulator_dev *dev)

{

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);

	struct hisi_pmic *pmic = rdev_to_pmic(dev);

	u32 reg_val, selector;



	/* get voltage selector */

	reg_val = hisi_pmic_read(pmic, sreg->register_info.vset_reg);

	BRAND_DEBUG("<[%s]: vset_reg=0x%x>\n", __func__, sreg->register_info.vset_reg);



	selector = (reg_val & sreg->register_info.vset_mask) >>

				(ffs(sreg->register_info.vset_mask) - 1);



	return sreg->rdesc.ops->list_voltage(dev, selector);

}



static int hisi_regulator_set_voltage(struct regulator_dev *dev,

				int min_uV, int max_uV, unsigned *selector)

{

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);

	struct hisi_pmic *pmic = rdev_to_pmic(dev);

	u32 vsel;

	int ret = 0;



	for (vsel = 0; vsel < sreg->rdesc.n_voltages; vsel++) {

		int uV = sreg->rdesc.volt_table[vsel];

		/* Break at the first in-range value */

		if (min_uV <= uV && uV <= max_uV)

			break;

	}



	/* unlikely to happen. sanity test done by regulator core */

	if (unlikely(vsel == sreg->rdesc.n_voltages))

		return -EINVAL;



	*selector = vsel;

	/* set voltage selector */

	hisi_pmic_rmw(pmic, sreg->register_info.vset_reg,

		sreg->register_info.vset_mask,

		vsel << (ffs(sreg->register_info.vset_mask) - 1));



	BRAND_DEBUG("<[%s]: vset_reg=0x%x, vset_mask=0x%x, value=0x%x>\n", __func__,\

			sreg->register_info.vset_reg,\

			sreg->register_info.vset_mask,\

			vsel << (ffs(sreg->register_info.vset_mask) - 1)\

			);



	return ret;

}



static unsigned int hisi_regulator_get_mode(struct regulator_dev *dev)

{

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);

	struct hisi_pmic *pmic = rdev_to_pmic(dev);

	u32 reg_val;



	reg_val = hisi_pmic_read(pmic, sreg->register_info.ctrl_reg);

	BRAND_DEBUG("<[%s]: reg_val=%d, ctrl_reg=0x%x, eco_mode_mask=0x%x>\n", __func__, reg_val,\

			sreg->register_info.ctrl_reg,\

			sreg->register_info.eco_mode_mask\

		   );



	if (reg_val & sreg->register_info.eco_mode_mask)

		return REGULATOR_MODE_IDLE;

	else

		return REGULATOR_MODE_NORMAL;

}



static int hisi_regulator_set_mode(struct regulator_dev *dev,

						unsigned int mode)

{

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);

	struct hisi_pmic *pmic = rdev_to_pmic(dev);

	u32 eco_mode;



	switch (mode) {

	case REGULATOR_MODE_NORMAL:

		eco_mode = HISI_ECO_MODE_DISABLE;

		break;

	case REGULATOR_MODE_IDLE:

		eco_mode = HISI_ECO_MODE_ENABLE;

		break;

	default:

		return -EINVAL;

	}



	/* set mode */

	hisi_pmic_rmw(pmic, sreg->register_info.ctrl_reg,

		sreg->register_info.eco_mode_mask,

		eco_mode << (ffs(sreg->register_info.eco_mode_mask) - 1));



	BRAND_DEBUG("<[%s]: ctrl_reg=0x%x, eco_mode_mask=0x%x, value=0x%x>\n", __func__,\

			sreg->register_info.ctrl_reg,\

			sreg->register_info.eco_mode_mask,\

			eco_mode << (ffs(sreg->register_info.eco_mode_mask) - 1)\

		   );

	return 0;

}





unsigned int hisi_regulator_get_optimum_mode(struct regulator_dev *dev,

			int input_uV, int output_uV, int load_uA)

{

	struct hisi_regulator *sreg = rdev_get_drvdata(dev);



	if ((load_uA == 0) || ((unsigned int)load_uA > sreg->eco_uA))

		return REGULATOR_MODE_NORMAL;

	else

		return REGULATOR_MODE_IDLE;

}



static int hisi_dt_parse_common(struct hisi_regulator *sreg,

					struct spmi_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	struct regulator_desc *rdesc = &sreg->rdesc;

	unsigned int register_info[3] = {0};

	int ret = 0;



	/* parse .register_info.ctrl_reg */

	ret = of_property_read_u32_array(np, "hisilicon,hisi-ctrl",

						register_info, 3);

	if (ret) {

		dev_err(dev, "no hisilicon,hisi-ctrl property set\n");

		goto dt_parse_common_end;

	}

	sreg->register_info.ctrl_reg = register_info[0];

	sreg->register_info.enable_mask = register_info[1];

	sreg->register_info.eco_mode_mask = register_info[2];



	/* parse .register_info.vset_reg */

	ret = of_property_read_u32_array(np, "hisilicon,hisi-vset",

						register_info, 2);

	if (ret) {

		dev_err(dev, "no hisilicon,hisi-vset property set\n");

		goto dt_parse_common_end;

	}

	sreg->register_info.vset_reg = register_info[0];

	sreg->register_info.vset_mask = register_info[1];



	/* parse .off-on-delay */

	ret = of_property_read_u32(np, "hisilicon,hisi-off-on-delay-us",

						&sreg->off_on_delay);

	if (ret) {

		dev_err(dev, "no hisilicon,hisi-off-on-delay-us property set\n");

		goto dt_parse_common_end;

	}



	/* parse .enable_time */

	ret = of_property_read_u32(np, "hisilicon,hisi-enable-time-us",

				   &rdesc->enable_time);

	if (ret) {

		dev_err(dev, "no hisilicon,hisi-enable-time-us property set\n");

		goto dt_parse_common_end;

	}



	/* parse .eco_uA */

	ret = of_property_read_u32(np, "hisilicon,hisi-eco-microamp",

				   &sreg->eco_uA);

	if (ret) {

		sreg->eco_uA = 0;

		ret = 0;

	}



dt_parse_common_end:

	return ret;

}



static int hisi_dt_parse_ldo(struct hisi_regulator *sreg,

				struct spmi_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	struct regulator_desc *rdesc = &sreg->rdesc;

	unsigned int *v_table;

	int ret = 0;



	/* parse .n_voltages, and .volt_table */

	ret = of_property_read_u32(np, "hisilicon,hisi-n-voltages",

				   &rdesc->n_voltages);

	if (ret) {

		dev_err(dev, "no hisilicon,hisi-n-voltages property set\n");

		goto dt_parse_ldo_end;

	}



	/* alloc space for .volt_table */

	v_table = devm_kzalloc(dev, sizeof(unsigned int) * rdesc->n_voltages,

								GFP_KERNEL);

	if (unlikely(!v_table)) {

		ret = -ENOMEM;

		dev_err(dev, "no memory for .volt_table\n");

		goto dt_parse_ldo_end;

	}



	ret = of_property_read_u32_array(np, "hisilicon,hisi-vset-table",

						v_table, rdesc->n_voltages);

	if (ret) {

		dev_err(dev, "no hisilicon,hisi-vset-table property set\n");

		goto dt_parse_ldo_end1;

	}

	rdesc->volt_table = v_table;



	/* parse hisi regulator's dt common part */

	ret = hisi_dt_parse_common(sreg, pdev);

	if (ret) {

		dev_err(dev, "failure in hisi_dt_parse_common\n");

		goto dt_parse_ldo_end1;

	}



	return ret;



dt_parse_ldo_end1:

dt_parse_ldo_end:

	return ret;

}



static struct regulator_ops hisi_ldo_rops = {

	.is_enabled = hisi_regulator_is_enabled,

	.enable = hisi_regulator_enable,

	.disable = hisi_regulator_disable,

	.list_voltage = regulator_list_voltage_table,

	.get_voltage = hisi_regulator_get_voltage,

	.set_voltage = hisi_regulator_set_voltage,

	.get_mode = hisi_regulator_get_mode,

	.set_mode = hisi_regulator_set_mode,

	.get_optimum_mode = hisi_regulator_get_optimum_mode,

};



static const struct hisi_regulator hisi_regulator_ldo = {

	.rdesc = {

	.ops = &hisi_ldo_rops,

		.type = REGULATOR_VOLTAGE,

		.owner = THIS_MODULE,

		},

	.dt_parse = hisi_dt_parse_ldo,

};



static struct of_device_id of_hisi_regulator_match_tbl[] = {

	{

		.compatible = "hisilicon-hisi-ldo",

		.data = &hisi_regulator_ldo,

	},

	{ /* end */ }

};



#ifdef CONFIG_HISI_PMIC_DEBUG

extern void get_current_regulator_dev(struct seq_file *s);

extern void set_regulator_state(char *ldo_name, int value);

extern void get_regulator_state(char *ldo_name);

extern int set_regulator_voltage(char *ldo_name, unsigned int vol_value);



u32 pmu_atoi(char *s)

{

	char *p = s;

	char c;

	u64 ret = 0;

	if (s == NULL)

		return 0;

	while ((c = *p++) != '\0') {

		if ('0' <= c && c <= '9') {

			ret *= 10;

			ret += (u64)((unsigned char)c - '0');

			if (ret > U32_MAX)

				return 0;

		} else {

			break;

		}

	}

	return (u32)ret;

}

static int dbg_hisi_regulator_show(struct seq_file *s, void *data)

{

	seq_printf(s, "\n\r");

	seq_printf(s, "%-13s %-15s %-15s %-15s %-15s\n\r",

			"LDO_NAME", "ON/OFF", "Use_count", "Open_count", "Always_on");

	seq_printf(s, "-----------------------------------------"

			"-----------------------------------------------\n\r");

	get_current_regulator_dev(s);

	return 0;

}



static int dbg_hisi_regulator_open(struct inode *inode, struct file *file)

{

	return single_open(file, dbg_hisi_regulator_show, inode->i_private);

}



static const struct file_operations debug_regulator_state_fops = {

	.open		= dbg_hisi_regulator_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release	= single_release,

};



static int dbg_control_regulator_show(struct seq_file *s, void *data)

{

	printk("                                                                             \n\r \

		---------------------------------------------------------------------------------\n\r \

		|usage:                                                                         |\n\r \

		|	S = state	R = read	V = voltage                                         |\n\r \

		|	set ldo state and voltage                                                   |\n\r \

		|	get ldo state and current voltage                                           |\n\r \

		|example:                                                                       |\n\r \

		|	echo S ldo16 0   > control_regulator	:disable ldo16                      |\n\r \

		|	echo S ldo16 1   > control_regulator	:enable ldo16                       |\n\r \

		|	echo R ldo16     > control_regulator	:get ldo16 state and voltage        |\n\r \

		|	echo V ldo16 xxx > control_regulator	:set ldo16 voltage                  |\n\r \

		---------------------------------------------------------------------------------\n\r");

	return 0;

}

static ssize_t dbg_control_regulator_set_value(struct file *filp, const char __user *buffer,

	size_t count, loff_t *ppos)

{

	char tmp[128] = {0};

	char ptr[128] = {0};

	char *vol = NULL;

	char num = 0;

	unsigned int i;

	int next_flag = 1;



	if (count >= 128) {

		pr_info("error! buffer size big than internal buffer\n");

		return -EFAULT;

	}



	if (copy_from_user(tmp, buffer, count)) {

		pr_info("error!\n");

		return -EFAULT;

	}



	if (tmp[0] == 'R' || tmp[0] == 'r') {

		for (i = 2; i < (count - 1); i++) {

			ptr[i - 2] = tmp[i];

		}

		ptr[i - 2] = '\0';

		get_regulator_state(ptr);

	} else if (tmp[0] == 'S' || tmp[0] == 's') {

		for (i = 2; i < (count - 1); i++) {

			if (tmp[i] == ' ') {

				next_flag = 0;

				ptr[i - 2] = '\0';

				continue;

			}

			if (next_flag) {

				ptr[i - 2] = tmp[i];

			} else {

				num = tmp[i] - 48;

			}

		}

		set_regulator_state(ptr, num);

	} else if (tmp[0] == 'V' || tmp[0] == 'v') {

		for (i = 2; i < (count - 1); i++) {

			if (tmp[i] == ' ') {

				next_flag = 0;

				ptr[i - 2] = '\0';

				continue;

			}

			if (next_flag) {

				ptr[i - 2] = tmp[i];

			} else {

				vol = &tmp[i];

				break;

			}

		}

		set_regulator_voltage(ptr, pmu_atoi(vol));

	}



	*ppos += count;



	return count;

}



static int dbg_control_regulator_open(struct inode *inode, struct file *file)

{

	file->private_data = inode->i_private;

	return single_open(file, dbg_control_regulator_show, &inode->i_private);

}



static const struct file_operations set_control_regulator_fops = {

	.open		= dbg_control_regulator_open,

	.read		= seq_read,

	.write		= dbg_control_regulator_set_value,

	.llseek		= seq_lseek,

	.release	= single_release,

};

#endif



static int hisi_regulator_probe(struct spmi_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	struct regulator_desc *rdesc;

	struct regulator_dev *rdev;

	struct hisi_regulator *sreg = NULL;

	struct regulator_init_data *initdata;

	struct regulator_config config = { };

	const struct of_device_id *match;

	struct regulation_constraints *constraint;

	const char *supplyname = NULL;

#ifdef CONFIG_HISI_PMIC_DEBUG

	struct dentry *d;

	static int debugfs_flag;

#endif

	unsigned int temp_modes;



	const struct hisi_regulator *template = NULL;

	int ret = 0;

	/* to check which type of regulator this is */

	match = of_match_device(of_hisi_regulator_match_tbl, &pdev->dev);

	if (NULL == match) {

		pr_err("get hisi regulator fail!\n\r");

		return -EINVAL;

	}



	template = match->data;

#if (LINUX_VERSION_CODE > KERNEL_VERSION(3, 13, 0))

	initdata = of_get_regulator_init_data(dev, np, NULL);

#else

	initdata = of_get_regulator_init_data(dev, np);

#endif

	if (NULL == initdata) {

		pr_err("get regulator init data error !\n");

		return -EINVAL;

	}



	/* hisi regulator supports two modes */

	constraint = &initdata->constraints;



	ret = of_property_read_u32_array(np, "hisilicon,valid-modes-mask",

						&(constraint->valid_modes_mask), 1);

	if (ret) {

		pr_err("no hisilicon,valid-modes-mask property set\n");

		ret = -ENODEV;

		return ret;

	}

	ret = of_property_read_u32_array(np, "hisilicon,valid-idle-mask",

						&temp_modes, 1);

	if (ret) {

		pr_err("no hisilicon,valid-modes-mask property set\n");

		ret = -ENODEV;

		return ret;

	}

	constraint->valid_ops_mask |= temp_modes;



	sreg = kmemdup(template, sizeof(*sreg), GFP_KERNEL);

	if (!sreg) {

		pr_err("template kememdup is fail. \n");

		return -ENOMEM;

	}

	sreg->name = initdata->constraints.name;

	rdesc = &sreg->rdesc;

	rdesc->name = sreg->name;

	rdesc->min_uV = initdata->constraints.min_uV;

	supplyname = of_get_property(np, "hisilicon,supply_name", NULL);

	if (supplyname != NULL) {

		initdata->supply_regulator = supplyname;

	}



	/* to parse device tree data for regulator specific */

	ret = sreg->dt_parse(sreg, pdev);

	if (ret) {

		dev_err(dev, "device tree parameter parse error!\n");

		goto hisi_probe_end;

	}



	config.dev = &pdev->dev;

	config.init_data = initdata;

	config.driver_data = sreg;

	config.of_node = pdev->dev.of_node;



	/* register regulator */

	rdev = regulator_register(rdesc, &config);

	if (IS_ERR(rdev)) {

		dev_err(dev, "failed to register %s\n",

			rdesc->name);

		ret = PTR_ERR(rdev);

		goto hisi_probe_end;

	}



	BRAND_DEBUG("[%s]:valid_modes_mask[0x%x], valid_ops_mask[0x%x]\n", rdesc->name,\

			constraint->valid_modes_mask, constraint->valid_ops_mask);



	dev_set_drvdata(dev, rdev);

#ifdef CONFIG_HISI_PMIC_DEBUG

	if (debugfs_flag == 0) {

		d = debugfs_create_dir("hisi_regulator_debugfs", NULL);

		if (!d) {

			dev_err(dev, "failed to create hisi regulator debugfs dir !\n");

			ret = -ENOMEM;

			goto hisi_probe_fail;

		}

		(void) debugfs_create_file("regulator_state", S_IRUSR,

						d, NULL, &debug_regulator_state_fops);



		(void) debugfs_create_file("control_regulator", S_IRUSR,

						d, NULL, &set_control_regulator_fops);

		debugfs_flag = 1;

	}

#endif



#ifdef CONFIG_HISI_PMIC_DEBUG

hisi_probe_fail:

	if (ret)

		regulator_unregister(rdev);

#endif

hisi_probe_end:

	if (ret)

		kfree(sreg);

	return ret;

}



static void hisi_regulator_remove(struct spmi_device *pdev)

{

	struct regulator_dev *rdev = dev_get_drvdata(&pdev->dev);

	struct hisi_regulator *sreg = rdev_get_drvdata(rdev);



	regulator_unregister(rdev);



	/* TODO: should i worry about that? devm_kzalloc */

	if (sreg->rdesc.volt_table)

		devm_kfree(&pdev->dev, (unsigned int *)sreg->rdesc.volt_table);



	kfree(sreg);

}

static int hisi_regulator_suspend(struct device *dev, pm_message_t state)

{

	struct hisi_regulator *hisi_regulator = dev_get_drvdata(dev);



	if (NULL == hisi_regulator) {

		pr_err("%s:regulator is NULL\n", __func__);

		return -ENOMEM;

	}



	pr_info("%s:+\n", __func__);

	pr_info("%s:-\n", __func__);



	return 0;

}/*lint !e715 */



static int hisi_regulator_resume(struct device *dev)

{

	struct hisi_regulator *hisi_regulator = dev_get_drvdata(dev);



	if (NULL == hisi_regulator) {

		pr_err("%s:regulator is NULL\n", __func__);

		return -ENOMEM;

	}



	pr_info("%s:+\n", __func__);

	pr_info("%s:-\n", __func__);



	return 0;

}



static struct spmi_driver hisi_pmic_driver = {

	.driver = {

		.name	= "hisi_regulator",

		.owner  = THIS_MODULE,

		.of_match_table = of_hisi_regulator_match_tbl,

		.suspend = hisi_regulator_suspend,

		.resume = hisi_regulator_resume,

	},

	.probe	= hisi_regulator_probe,

	.remove	= hisi_regulator_remove,

};



static int __init hisi_regulator_init(void)

{

	return spmi_driver_register(&hisi_pmic_driver);

}



static void __exit hisi_regulator_exit(void)

{

	spmi_driver_unregister(&hisi_pmic_driver);

}



fs_initcall(hisi_regulator_init);

module_exit(hisi_regulator_exit);



MODULE_DESCRIPTION("Hisi regulator driver");

MODULE_LICENSE("GPL v2");