linux/drivers/power/supply/bd70528-charger.c

// SPDX-License-Identifier: GPL-2.0-or-later
//
// Copyright (C) 2018 ROHM Semiconductors
//
// power-supply driver for ROHM BD70528 PMIC

/*
 * BD70528 charger HW state machine.
 *
 * The thermal shutdown state is not drawn. From any other state but
 * battery error and suspend it is possible to go to TSD/TMP states
 * if temperature is out of bounds.
 *
 *  CHG_RST = H
 *  or CHG_EN=L
 *  or (DCIN2_UVLO=L && DCIN1_UVLO=L)
 *  or (DCIN2_OVLO=H & DCIN1_UVKLO=L)
 *
 *  +--------------+         +--------------+
 *  |              |         |              |
 *  |  Any state   +-------> |    Suspend   |
 *  |              |         |              |
 *  +--------------+         +------+-------+
 *                                  |
 *  CHG_EN = H && BAT_DET = H &&    |
 *  No errors (temp, bat_ov, UVLO,  |
 *  OVLO...)                        |
 *                                  |
 *  BAT_OV or             +---------v----------+
 *  (DBAT && TTRI)        |                    |
 *      +-----------------+   Trickle Charge   | <---------------+
 *      |                 |                    |                 |
 *      |                 +-------+------------+                 |
 *      |                         |                              |
 *      |                         |     ^                        |
 *      |        V_BAT > VTRI_TH  |     |  VBAT < VTRI_TH - 50mV |
 *      |                         |     |                        |
 *      |                         v     |                        |
 *      |                               |                        |
 *      |     BAT_OV or      +----------+----+                   |
 *      |     (DBAT && TFST) |               |                   |
 *      |   +----------------+  Fast Charge  |                   |
 *      |   |                |               |                   |
 *      v   v                +----+----------+                   |
 *                                |                              |
 *+----------------+   ILIM_DET=L |    ^ ILIM_DET                |
 *|                |   & CV_DET=H |    | or CV_DET=L             |
 *|  Battery Error |   & VBAT >   |    | or VBAT < VRECHG_TH     |
 *|                |   VRECHG_TH  |    | or IBAT  > IFST/x       |
 *+----------------+   & IBAT <   |    |                         |
 *                     IFST/x     v    |                         |
 *       ^                             |                         |
 *       |                   +---------+-+                       |
 *       |                   |           |                       |
 *       +-------------------+  Top OFF  |                       |
 *  BAT_OV = H or            |           |                       |
 *  (DBAT && TFST)           +-----+-----+                       |
 *                                 |                             |
 *           Stay top-off for 15s  |                             |
 *                                 v                             |
 *                                                               |
 *                            +--------+                         |
 *                            |        |                         |
 *                            |  Done  +-------------------------+
 *                            |        |
 *                            +--------+   VBAT < VRECHG_TH
 */

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/mfd/rohm-bd70528.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>

#define CHG_STAT_SUSPEND	0x0
#define CHG_STAT_TRICKLE	0x1
#define CHG_STAT_FAST		0x3
#define CHG_STAT_TOPOFF		0xe
#define CHG_STAT_DONE		0xf
#define CHG_STAT_OTP_TRICKLE	0x10
#define CHG_STAT_OTP_FAST	0x11
#define CHG_STAT_OTP_DONE	0x12
#define CHG_STAT_TSD_TRICKLE	0x20
#define CHG_STAT_TSD_FAST	0x21
#define CHG_STAT_TSD_TOPOFF	0x22
#define CHG_STAT_BAT_ERR	0x7f

static const char *bd70528_charger_model = "BD70528";
static const char *bd70528_charger_manufacturer = "ROHM Semiconductors";

#define BD_ERR_IRQ_HND(_name_, _wrn_)					\
static irqreturn_t bd0528_##_name_##_interrupt(int irq, void *arg)	\
{									\
	struct power_supply *psy = (struct power_supply *)arg;		\
									\
	power_supply_changed(psy);					\
	dev_err(&psy->dev, (_wrn_));					\
									\
	return IRQ_HANDLED;						\
}

#define BD_INFO_IRQ_HND(_name_, _wrn_)					\
static irqreturn_t bd0528_##_name_##_interrupt(int irq, void *arg)	\
{									\
	struct power_supply *psy = (struct power_supply *)arg;		\
									\
	power_supply_changed(psy);					\
	dev_dbg(&psy->dev, (_wrn_));					\
									\
	return IRQ_HANDLED;						\
}

#define BD_IRQ_HND(_name_) bd0528_##_name_##_interrupt

struct bd70528_psy {
	struct regmap *regmap;
	struct device *dev;
	struct power_supply *psy;
};

BD_ERR_IRQ_HND(BAT_OV_DET, "Battery overvoltage detected\n");
BD_ERR_IRQ_HND(DBAT_DET, "Dead battery detected\n");
BD_ERR_IRQ_HND(COLD_DET, "Battery cold\n");
BD_ERR_IRQ_HND(HOT_DET, "Battery hot\n");
BD_ERR_IRQ_HND(CHG_TSD, "Charger thermal shutdown\n");
BD_ERR_IRQ_HND(DCIN2_OV_DET, "DCIN2 overvoltage detected\n");

BD_INFO_IRQ_HND(BAT_OV_RES, "Battery voltage back to normal\n");
BD_INFO_IRQ_HND(COLD_RES, "Battery temperature back to normal\n");
BD_INFO_IRQ_HND(HOT_RES, "Battery temperature back to normal\n");
BD_INFO_IRQ_HND(BAT_RMV, "Battery removed\n");
BD_INFO_IRQ_HND(BAT_DET, "Battery detected\n");
BD_INFO_IRQ_HND(DCIN2_OV_RES, "DCIN2 voltage back to normal\n");
BD_INFO_IRQ_HND(DCIN2_RMV, "DCIN2 removed\n");
BD_INFO_IRQ_HND(DCIN2_DET, "DCIN2 detected\n");
BD_INFO_IRQ_HND(DCIN1_RMV, "DCIN1 removed\n");
BD_INFO_IRQ_HND(DCIN1_DET, "DCIN1 detected\n");

struct irq_name_pair {
	const char *n;
	irqreturn_t (*h)(int irq, void *arg);
};

static int bd70528_get_irqs(struct platform_device *pdev,
			    struct bd70528_psy *bdpsy)
{
	int irq, i, ret;
	unsigned int mask;
	static const struct irq_name_pair bd70528_chg_irqs[] = {
		{ .n = "bd70528-bat-ov-res", .h = BD_IRQ_HND(BAT_OV_RES) },
		{ .n = "bd70528-bat-ov-det", .h = BD_IRQ_HND(BAT_OV_DET) },
		{ .n = "bd70528-bat-dead", .h = BD_IRQ_HND(DBAT_DET) },
		{ .n = "bd70528-bat-warmed", .h = BD_IRQ_HND(COLD_RES) },
		{ .n = "bd70528-bat-cold", .h = BD_IRQ_HND(COLD_DET) },
		{ .n = "bd70528-bat-cooled", .h = BD_IRQ_HND(HOT_RES) },
		{ .n = "bd70528-bat-hot", .h = BD_IRQ_HND(HOT_DET) },
		{ .n = "bd70528-chg-tshd", .h = BD_IRQ_HND(CHG_TSD) },
		{ .n = "bd70528-bat-removed", .h = BD_IRQ_HND(BAT_RMV) },
		{ .n = "bd70528-bat-detected", .h = BD_IRQ_HND(BAT_DET) },
		{ .n = "bd70528-dcin2-ov-res", .h = BD_IRQ_HND(DCIN2_OV_RES) },
		{ .n = "bd70528-dcin2-ov-det", .h = BD_IRQ_HND(DCIN2_OV_DET) },
		{ .n = "bd70528-dcin2-removed", .h = BD_IRQ_HND(DCIN2_RMV) },
		{ .n = "bd70528-dcin2-detected", .h = BD_IRQ_HND(DCIN2_DET) },
		{ .n = "bd70528-dcin1-removed", .h = BD_IRQ_HND(DCIN1_RMV) },
		{ .n = "bd70528-dcin1-detected", .h = BD_IRQ_HND(DCIN1_DET) },
	};

	for (i = 0; i < ARRAY_SIZE(bd70528_chg_irqs); i++) {
		irq = platform_get_irq_byname(pdev, bd70528_chg_irqs[i].n);
		if (irq < 0) {
			dev_err(&pdev->dev, "Bad IRQ information for %s (%d)\n",
				bd70528_chg_irqs[i].n, irq);
			return irq;
		}
		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
						bd70528_chg_irqs[i].h,
						IRQF_ONESHOT,
						bd70528_chg_irqs[i].n,
						bdpsy->psy);

		if (ret)
			return ret;
	}
	/*
	 * BD70528 irq controller is not touching the main mask register.
	 * So enable the charger block interrupts at main level. We can just
	 * leave them enabled as irq-controller should disable irqs
	 * from sub-registers when IRQ is disabled or freed.
	 */
	mask = BD70528_REG_INT_BAT1_MASK | BD70528_REG_INT_BAT2_MASK;
	ret = regmap_update_bits(bdpsy->regmap,
				 BD70528_REG_INT_MAIN_MASK, mask, 0);
	if (ret)
		dev_err(&pdev->dev, "Failed to enable charger IRQs\n");

	return ret;
}

static int bd70528_get_charger_status(struct bd70528_psy *bdpsy, int *val)
{
	int ret;
	unsigned int v;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_CURR_STAT, &v);
	if (ret) {
		dev_err(bdpsy->dev, "Charger state read failure %d\n",
			ret);
		return ret;
	}

	switch (v & BD70528_MASK_CHG_STAT) {
	case CHG_STAT_SUSPEND:
	/* Maybe we should check the CHG_TTRI_EN? */
	case CHG_STAT_OTP_TRICKLE:
	case CHG_STAT_OTP_FAST:
	case CHG_STAT_OTP_DONE:
	case CHG_STAT_TSD_TRICKLE:
	case CHG_STAT_TSD_FAST:
	case CHG_STAT_TSD_TOPOFF:
	case CHG_STAT_BAT_ERR:
		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	case CHG_STAT_DONE:
		*val = POWER_SUPPLY_STATUS_FULL;
		break;
	case CHG_STAT_TRICKLE:
	case CHG_STAT_FAST:
	case CHG_STAT_TOPOFF:
		*val = POWER_SUPPLY_STATUS_CHARGING;
		break;
	default:
		*val = POWER_SUPPLY_STATUS_UNKNOWN;
		break;
	}

	return 0;
}

static int bd70528_get_charge_type(struct bd70528_psy *bdpsy, int *val)
{
	int ret;
	unsigned int v;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_CURR_STAT, &v);
	if (ret) {
		dev_err(bdpsy->dev, "Charger state read failure %d\n",
			ret);
		return ret;
	}

	switch (v & BD70528_MASK_CHG_STAT) {
	case CHG_STAT_TRICKLE:
		*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
		break;
	case CHG_STAT_FAST:
	case CHG_STAT_TOPOFF:
		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
		break;
	case CHG_STAT_DONE:
	case CHG_STAT_SUSPEND:
	/* Maybe we should check the CHG_TTRI_EN? */
	case CHG_STAT_OTP_TRICKLE:
	case CHG_STAT_OTP_FAST:
	case CHG_STAT_OTP_DONE:
	case CHG_STAT_TSD_TRICKLE:
	case CHG_STAT_TSD_FAST:
	case CHG_STAT_TSD_TOPOFF:
	case CHG_STAT_BAT_ERR:
		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
		break;
	default:
		*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
		break;
	}

	return 0;
}

static int bd70528_get_battery_health(struct bd70528_psy *bdpsy, int *val)
{
	int ret;
	unsigned int v;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_BAT_STAT, &v);
	if (ret) {
		dev_err(bdpsy->dev, "Battery state read failure %d\n",
			ret);
		return ret;
	}
	/* No battery? */
	if (!(v & BD70528_MASK_CHG_BAT_DETECT))
		*val = POWER_SUPPLY_HEALTH_DEAD;
	else if (v & BD70528_MASK_CHG_BAT_OVERVOLT)
		*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
	else if (v & BD70528_MASK_CHG_BAT_TIMER)
		*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
	else
		*val = POWER_SUPPLY_HEALTH_GOOD;

	return 0;
}

static int bd70528_get_online(struct bd70528_psy *bdpsy, int *val)
{
	int ret;
	unsigned int v;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_IN_STAT, &v);
	if (ret) {
		dev_err(bdpsy->dev, "DC1 IN state read failure %d\n",
			ret);
		return ret;
	}

	*val = (v & BD70528_MASK_CHG_DCIN1_UVLO) ? 1 : 0;

	return 0;
}

static int bd70528_get_present(struct bd70528_psy *bdpsy, int *val)
{
	int ret;
	unsigned int v;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_BAT_STAT, &v);
	if (ret) {
		dev_err(bdpsy->dev, "Battery state read failure %d\n",
			ret);
		return ret;
	}

	*val = (v & BD70528_MASK_CHG_BAT_DETECT) ? 1 : 0;

	return 0;
}

struct linear_range {
	int min;
	int step;
	int vals;
	int low_sel;
};

static const struct linear_range current_limit_ranges[] = {
	{
		.min = 5,
		.step = 1,
		.vals = 36,
		.low_sel = 0,
	},
	{
		.min = 40,
		.step = 5,
		.vals = 5,
		.low_sel = 0x23,
	},
	{
		.min = 60,
		.step = 20,
		.vals = 8,
		.low_sel = 0x27,
	},
	{
		.min = 200,
		.step = 50,
		.vals = 7,
		.low_sel = 0x2e,
	}
};

/*
 * BD70528 would support setting and getting own charge current/
 * voltage for low temperatures. The driver currently only reads
 * the charge current at room temperature. We do set both though.
 */
static const struct linear_range warm_charge_curr[] = {
	{
		.min = 10,
		.step = 10,
		.vals = 20,
		.low_sel = 0,
	},
	{
		.min = 200,
		.step = 25,
		.vals = 13,
		.low_sel = 0x13,
	},
};

/*
 * Cold charge current selectors are identical to warm charge current
 * selectors. The difference is that only smaller currents are available
 * at cold charge range.
 */
#define MAX_COLD_CHG_CURR_SEL 0x15
#define MAX_WARM_CHG_CURR_SEL 0x1f
#define MIN_CHG_CURR_SEL 0x0

static int find_value_for_selector_low(const struct linear_range *r,
				       int selectors, unsigned int sel,
				       unsigned int *val)
{
	int i;

	for (i = 0; i < selectors; i++) {
		if (r[i].low_sel <= sel && r[i].low_sel + r[i].vals >= sel) {
			*val = r[i].min + (sel - r[i].low_sel) * r[i].step;
			return 0;
		}
	}
	return -EINVAL;
}

/*
 * For BD70528 voltage/current limits we happily accept any value which
 * belongs the range. We could check if value matching the selector is
 * desired by computing the range min + (sel - sel_low) * range step - but
 * I guess it is enough if we use voltage/current which is closest (below)
 * the requested?
 */
static int find_selector_for_value_low(const struct linear_range *r,
				       int selectors, unsigned int val,
				       unsigned int *sel, bool *found)
{
	int i;
	int ret = -EINVAL;

	*found = false;
	for (i = 0; i < selectors; i++) {
		if (r[i].min <= val) {
			if (r[i].min + r[i].step * r[i].vals >= val) {
				*found = true;
				*sel = r[i].low_sel + (val - r[i].min) /
				       r[i].step;
				ret = 0;
				break;
			}
			/*
			 * If the range max is smaller than requested
			 * we can set the max supported value from range
			 */
			*sel = r[i].low_sel + r[i].vals;
			ret = 0;
		}
	}
	return ret;
}

static int get_charge_current(struct bd70528_psy *bdpsy, int *ma)
{
	unsigned int sel;
	int ret;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_CHG_CURR_WARM,
			  &sel);
	if (ret) {
		dev_err(bdpsy->dev,
			"Charge current reading failed (%d)\n", ret);
		return ret;
	}

	sel &= BD70528_MASK_CHG_CHG_CURR;

	ret = find_value_for_selector_low(&warm_charge_curr[0],
					  ARRAY_SIZE(warm_charge_curr), sel,
					  ma);
	if (ret) {
		dev_err(bdpsy->dev,
			"Unknown charge current value 0x%x\n",
			sel);
	}

	return ret;
}

static int get_current_limit(struct bd70528_psy *bdpsy, int *ma)
{
	unsigned int sel;
	int ret;

	ret = regmap_read(bdpsy->regmap, BD70528_REG_CHG_DCIN_ILIM,
			  &sel);

	if (ret) {
		dev_err(bdpsy->dev,
			"Input current limit reading failed (%d)\n", ret);
		return ret;
	}

	sel &= BD70528_MASK_CHG_DCIN_ILIM;

	ret = find_value_for_selector_low(&current_limit_ranges[0],
					  ARRAY_SIZE(current_limit_ranges), sel,
					  ma);

	if (ret) {
		/* Unspecified values mean 500 mA */
		*ma = 500;
	}
	return 0;
}

static enum power_supply_property bd70528_charger_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static int bd70528_charger_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	struct bd70528_psy *bdpsy = power_supply_get_drvdata(psy);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		return bd70528_get_charger_status(bdpsy, &val->intval);
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		return bd70528_get_charge_type(bdpsy, &val->intval);
	case POWER_SUPPLY_PROP_HEALTH:
		return bd70528_get_battery_health(bdpsy, &val->intval);
	case POWER_SUPPLY_PROP_PRESENT:
		return bd70528_get_present(bdpsy, &val->intval);
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		ret = get_current_limit(bdpsy, &val->intval);
		val->intval *= 1000;
		return ret;
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
		ret = get_charge_current(bdpsy, &val->intval);
		val->intval *= 1000;
		return ret;
	case POWER_SUPPLY_PROP_ONLINE:
		return bd70528_get_online(bdpsy, &val->intval);
	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = bd70528_charger_model;
		return 0;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = bd70528_charger_manufacturer;
		return 0;
	default:
		break;
	}

	return -EINVAL;
}

static int bd70528_prop_is_writable(struct power_supply *psy,
				    enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
		return 1;
	default:
		break;
	}
	return 0;
}

static int set_charge_current(struct bd70528_psy *bdpsy, int ma)
{
	unsigned int reg;
	int ret = 0, tmpret;
	bool found;

	if (ma > 500) {
		dev_warn(bdpsy->dev,
			 "Requested charge current %u exceed maximum (500mA)\n",
			 ma);
		reg = MAX_WARM_CHG_CURR_SEL;
		goto set;
	}
	if (ma < 10) {
		dev_err(bdpsy->dev,
			"Requested charge current %u smaller than min (10mA)\n",
			 ma);
		reg = MIN_CHG_CURR_SEL;
		ret = -EINVAL;
		goto set;
	}

	ret = find_selector_for_value_low(&warm_charge_curr[0],
					  ARRAY_SIZE(warm_charge_curr), ma,
					  &reg, &found);
	if (ret) {
		reg = MIN_CHG_CURR_SEL;
		goto set;
	}
	if (!found) {
		/* There was a gap in supported values and we hit it */
		dev_warn(bdpsy->dev,
			 "Unsupported charge current %u mA\n", ma);
	}
set:

	tmpret = regmap_update_bits(bdpsy->regmap,
				    BD70528_REG_CHG_CHG_CURR_WARM,
				    BD70528_MASK_CHG_CHG_CURR, reg);
	if (tmpret)
		dev_err(bdpsy->dev,
			"Charge current write failure (%d)\n", tmpret);

	if (reg > MAX_COLD_CHG_CURR_SEL)
		reg = MAX_COLD_CHG_CURR_SEL;

	if (!tmpret)
		tmpret = regmap_update_bits(bdpsy->regmap,
					    BD70528_REG_CHG_CHG_CURR_COLD,
					    BD70528_MASK_CHG_CHG_CURR, reg);

	if (!ret)
		ret = tmpret;

	return ret;
}

#define MAX_CURR_LIMIT_SEL 0x34
#define MIN_CURR_LIMIT_SEL 0x0

static int set_current_limit(struct bd70528_psy *bdpsy, int ma)
{
	unsigned int reg;
	int ret = 0, tmpret;
	bool found;

	if (ma > 500) {
		dev_warn(bdpsy->dev,
			 "Requested current limit %u exceed maximum (500mA)\n",
			 ma);
		reg = MAX_CURR_LIMIT_SEL;
		goto set;
	}
	if (ma < 5) {
		dev_err(bdpsy->dev,
			"Requested current limit %u smaller than min (5mA)\n",
			ma);
		reg = MIN_CURR_LIMIT_SEL;
		ret = -EINVAL;
		goto set;
	}

	ret = find_selector_for_value_low(&current_limit_ranges[0],
					  ARRAY_SIZE(current_limit_ranges), ma,
					  &reg, &found);
	if (ret) {
		reg = MIN_CURR_LIMIT_SEL;
		goto set;
	}
	if (!found) {
		/* There was a gap in supported values and we hit it ?*/
		dev_warn(bdpsy->dev, "Unsupported current limit %umA\n",
			 ma);
	}

set:
	tmpret = regmap_update_bits(bdpsy->regmap,
				    BD70528_REG_CHG_DCIN_ILIM,
				    BD70528_MASK_CHG_DCIN_ILIM, reg);

	if (!ret)
		ret = tmpret;

	return ret;
}

static int bd70528_charger_set_property(struct power_supply *psy,
					enum power_supply_property psp,
					const union power_supply_propval *val)
{
	struct bd70528_psy *bdpsy = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		return set_current_limit(bdpsy, val->intval / 1000);
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
		return set_charge_current(bdpsy, val->intval / 1000);
	default:
		break;
	}
	return -EINVAL;
}

static const struct power_supply_desc bd70528_charger_desc = {
	.name		= "bd70528-charger",
	.type		= POWER_SUPPLY_TYPE_MAINS,
	.properties	= bd70528_charger_props,
	.num_properties	= ARRAY_SIZE(bd70528_charger_props),
	.get_property	= bd70528_charger_get_property,
	.set_property	= bd70528_charger_set_property,
	.property_is_writeable	= bd70528_prop_is_writable,
};

static int bd70528_power_probe(struct platform_device *pdev)
{
	struct bd70528_psy *bdpsy;
	struct power_supply_config cfg = {};

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

	bdpsy->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	if (!bdpsy->regmap) {
		dev_err(&pdev->dev, "No regmap found for chip\n");
		return -EINVAL;
	}
	bdpsy->dev = &pdev->dev;

	platform_set_drvdata(pdev, bdpsy);
	cfg.drv_data = bdpsy;
	cfg.of_node = pdev->dev.parent->of_node;

	bdpsy->psy = devm_power_supply_register(&pdev->dev,
						&bd70528_charger_desc, &cfg);
	if (IS_ERR(bdpsy->psy)) {
		dev_err(&pdev->dev, "failed: power supply register\n");
		return PTR_ERR(bdpsy->psy);
	}

	return bd70528_get_irqs(pdev, bdpsy);
}

static struct platform_driver bd70528_power = {
	.driver = {
		.name = "bd70528-power"
	},
	.probe = bd70528_power_probe,
};

module_platform_driver(bd70528_power);

MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("BD70528 power-supply driver");
MODULE_LICENSE("GPL");