path: root/drivers/regulator/da9062-regulator.c

// SPDX-License-Identifier: GPL-2.0+
//
// Regulator device driver for DA9061 and DA9062.
// Copyright (C) 2015-2017  Dialog Semiconductor

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/da9062/core.h>
#include <linux/mfd/da9062/registers.h>
#include <dt-bindings/regulator/dlg,da9063-regulator.h>

/* Regulator IDs */
enum {
	DA9061_ID_BUCK1,
	DA9061_ID_BUCK2,
	DA9061_ID_BUCK3,
	DA9061_ID_LDO1,
	DA9061_ID_LDO2,
	DA9061_ID_LDO3,
	DA9061_ID_LDO4,
	DA9061_MAX_REGULATORS,
};

enum {
	DA9062_ID_BUCK1,
	DA9062_ID_BUCK2,
	DA9062_ID_BUCK3,
	DA9062_ID_BUCK4,
	DA9062_ID_LDO1,
	DA9062_ID_LDO2,
	DA9062_ID_LDO3,
	DA9062_ID_LDO4,
	DA9062_MAX_REGULATORS,
};

/* Regulator capabilities and registers description */
struct da9062_regulator_info {
	struct regulator_desc desc;
	/* Main register fields */
	struct reg_field mode;
	struct reg_field suspend;
	struct reg_field sleep;
	struct reg_field suspend_sleep;
	unsigned int suspend_vsel_reg;
	/* Event detection bit */
	struct reg_field oc_event;
};

/* Single regulator settings */
struct da9062_regulator {
	struct regulator_desc			desc;
	struct regulator_dev			*rdev;
	struct da9062				*hw;
	const struct da9062_regulator_info	*info;

	struct regmap_field			*mode;
	struct regmap_field			*suspend;
	struct regmap_field			*sleep;
	struct regmap_field			*suspend_sleep;
};

/* Encapsulates all information for the regulators driver */
struct da9062_regulators {
	int					irq_ldo_lim;
	unsigned				n_regulators;
	/* Array size to be defined during init. Keep at end. */
	struct da9062_regulator			regulator[];
};

/* Regulator operations */

/* Current limits array (in uA)
 * - DA9061_ID_[BUCK1|BUCK3]
 * - DA9062_ID_[BUCK1|BUCK2|BUCK4]
 * Entry indexes corresponds to register values.
 */
static const unsigned int da9062_buck_a_limits[] = {
	 500000,  600000,  700000,  800000,  900000, 1000000, 1100000, 1200000,
	1300000, 1400000, 1500000, 1600000, 1700000, 1800000, 1900000, 2000000
};

/* Current limits array (in uA)
 * - DA9061_ID_BUCK2
 * - DA9062_ID_BUCK3
 * Entry indexes corresponds to register values.
 */
static const unsigned int da9062_buck_b_limits[] = {
	1500000, 1600000, 1700000, 1800000, 1900000, 2000000, 2100000, 2200000,
	2300000, 2400000, 2500000, 2600000, 2700000, 2800000, 2900000, 3000000
};

static unsigned int da9062_map_buck_mode(unsigned int mode)
{
	switch (mode) {
	case DA9063_BUCK_MODE_SLEEP:
		return REGULATOR_MODE_STANDBY;
	case DA9063_BUCK_MODE_SYNC:
		return REGULATOR_MODE_FAST;
	case DA9063_BUCK_MODE_AUTO:
		return REGULATOR_MODE_NORMAL;
	default:
		return REGULATOR_MODE_INVALID;
	}
}

static int da9062_buck_set_mode(struct regulator_dev *rdev, unsigned mode)
{
	struct da9062_regulator *regl = rdev_get_drvdata(rdev);
	unsigned val;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = DA9063_BUCK_MODE_SYNC;
		break;
	case REGULATOR_MODE_NORMAL:
		val = DA9063_BUCK_MODE_AUTO;
		break;
	case REGULATOR_MODE_STANDBY:
		val = DA9063_BUCK_MODE_SLEEP;
		break;
	default:
		return -EINVAL;
	}

	return regmap_field_write(regl->mode, val);
}

/*
 * Bucks use single mode register field for normal operation
 * and suspend state.
 * There are 3 modes to map to: FAST, NORMAL, and STANDBY.
 */

static unsigned da9062_buck_get_mode(struct regulator_dev *rdev)
{
	struct da9062_regulator *regl = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret;

	ret = regmap_field_read(regl->mode, &val);
	if (ret < 0)
		return ret;

	switch (val) {
	default:
		/* Sleep flag bit decides the mode */
		break;
	case DA9063_BUCK_MODE_SLEEP:
		return REGULATOR_MODE_STANDBY;
	case DA9063_BUCK_MODE_SYNC:
		return REGULATOR_MODE_FAST;
	case DA9063_BUCK_MODE_AUTO:
		return REGULATOR_MODE_NORMAL;
	}

	ret = regmap_field_read(regl->sleep, &val);
	if (ret < 0)
		return 0;

	if (val)
		return REGULATOR_MODE_STANDBY;
	else
		return REGULATOR_MODE_FAST;
}

/*
 * LDOs use sleep flags - one for normal and one for suspend state.
 * There are 2 modes to map to: NORMAL and STANDBY (sleep) for each state.
 */

static int da9062_ldo_set_mode(struct regulator_dev *rdev, unsigned mode)
{
	struct da9062_regulator *regl = rdev_get_drvdata(rdev);
	unsigned val;

	switch (mode) {
	case REGULATOR_MODE_NORMAL:
		val = 0;
		break;
	case REGULATOR_MODE_STANDBY:
		val = 1;
		break;
	default:
		return -EINVAL;
	}

	return regmap_field_write(regl->sleep, val);
}

static unsigned da9062_ldo_get_mode(struct regulator_dev *rdev)
{
	struct da9062_regulator *regl = rdev_get_drvdata(rdev);
	int ret, val;

	ret = regmap_field_read(regl->sleep, &val);
	if (ret < 0)
		return 0;

	if (val)
		return REGULATOR_MODE_STANDBY;
	else
		return REGULATOR_MODE_NORMAL;
}

static int da9062_buck_get_status(struct regulator_dev *rdev)
{
	int ret = regulator_is_enabled_regmap(rdev);

	if (ret == 0) {
		ret = REGULATOR_STATUS_OFF;
	} else if (ret > 0) {
		ret = da9062_buck_get_mode(rdev);
		if (ret > 0)
			ret = regulator_mode_to_status(<