drivers/power/supply/bd70528-charger.c - third_party/kernel - Git at Google

 // 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");
 MODULE_ALIAS("platform:bd70528-power");
	// 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");
	MODULE_ALIAS("platform:bd70528-power");