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

/*
 * Regulator device driver for DA9061 and DA9062.
 * Copyright (C) 2015-2017  Dialog Semiconductor
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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/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>

/* 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;
	/* Current limiting */
	unsigned int n_current_limits;
	const int *current_limits;
	/* 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;
	struct reg_field ilimit;
	/* 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;
	struct regmap_field			*ilimit;
};

/* 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[0];
};

/* BUCK modes */
enum {
	BUCK_MODE_MANUAL,	/* 0 */
	BUCK_MODE_SLEEP,	/* 1 */
	BUCK_MODE_SYNC,		/* 2 */
	BUCK_MODE_AUTO		/* 3 */
};

/* Regulator operations */

/* Current limits array (in uA)
 * - DA9061_ID_[BUCK1|BUCK3]
 * - DA9062_ID_[BUCK1|BUCK2|BUCK4]
 * Entry indexes corresponds to register values.
 */
static const 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 int da9062_buck_b_limits[] = {
	1500000, 1600000, 1700000, 1800000, 1900000, 2000000, 2100000, 2200000,
	2300000, 2400000, 2500000, 2600000, 2700000, 2800000, 2900000, 3000000
};

static int da9062_set_current_limit(struct regulator_dev *rdev,
				    int min_ua, int max_ua)
{
	struct da9062_regulator *regl = rdev_get_drvdata(rdev);
	const struct da9062_regulator_info *rinfo = regl->info;
	int n, tval;

	for (n = 0; n < rinfo->n_current_limits; n++) {
		tval = rinfo->current_limits[n];
		if (tval >= min_ua && tval <= max_ua)
			return regmap_field_write(regl->ilimit, n);
	}

	return -EINVAL;
}

static int da9062_get_current_limit(struct regulator_dev *rdev)
{
	struct da9062_regulator *regl = rdev_get_drvdata(rdev);
	const struct da9062_regulator_info *rinfo = regl->info;
	unsigned int sel;
	int ret;

	ret = regmap_field_read(regl->ilimit, &sel);
	if (ret < 0)
		return ret;

	if (sel >= rinfo->n_current_limits)
		sel = rinfo->n_current_limits - 1;

	return rinfo->current_limits[sel];
}

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 = BUCK_MODE_SYNC;
		break;
	case REGULATOR_MODE_NORMAL:
		val = BUCK_MODE_AUTO;
		break;
	case REGULATOR_MODE_STANDBY:
		val = 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)
{