path: root/drivers/regulator/of_regulator.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * OF helpers for regulator framework
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Rajendra Nayak <rnayak@ti.com>
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#include "internal.h"

static const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
	[PM_SUSPEND_STANDBY]	= "regulator-state-standby",
	[PM_SUSPEND_MEM]	= "regulator-state-mem",
	[PM_SUSPEND_MAX]	= "regulator-state-disk",
};

static void fill_limit(int *limit, int val)
{
	if (val)
		if (val == 1)
			*limit = REGULATOR_NOTIF_LIMIT_ENABLE;
		else
			*limit = val;
	else
		*limit = REGULATOR_NOTIF_LIMIT_DISABLE;
}

static void of_get_regulator_prot_limits(struct device_node *np,
				struct regulation_constraints *constraints)
{
	u32 pval;
	int i;
	static const char *const props[] = {
		"regulator-oc-%s-microamp",
		"regulator-ov-%s-microvolt",
		"regulator-temp-%s-kelvin",
		"regulator-uv-%s-microvolt",
	};
	struct notification_limit *limits[] = {
		&constraints->over_curr_limits,
		&constraints->over_voltage_limits,
		&constraints->temp_limits,
		&constraints->under_voltage_limits,
	};
	bool set[4] = {0};

	/* Protection limits: */
	for (i = 0; i < ARRAY_SIZE(props); i++) {
		char prop[255];
		bool found;
		int j;
		static const char *const lvl[] = {
			"protection", "error", "warn"
		};
		int *l[] = {
			&limits[i]->prot, &limits[i]->err, &limits[i]->warn,
		};

		for (j = 0; j < ARRAY_SIZE(lvl); j++) {
			snprintf(prop, 255, props[i], lvl[j]);
			found = !of_property_read_u32(np, prop, &pval);
			if (found)
				fill_limit(l[j], pval);
			set[i] |= found;
		}
	}
	constraints->over_current_detection = set[0];
	constraints->over_voltage_detection = set[1];
	constraints->over_temp_detection = set[2];
	constraints->under_voltage_detection = set[3];
}

static int of_get_regulation_constraints(struct device *dev,
					struct device_node *np,
					struct regulator_init_data *init_data,
					const struct regulator_desc *desc)
{
	struct regulation_constraints *constraints = &init_data->constraints;
	struct regulator_state *suspend_state;
	struct device_node *suspend_np;
	unsigned int mode;
	int ret, i, len;
	int n_phandles;
	u32 pval;

	n_phandles = of_count_phandle_with_args(np, "regulator-coupled-with",
						NULL);
	n_phandles = max(n_phandles, 0);

	constraints->name = of_get_property(np, "regulator-name", NULL);

	if (!of_property_read_u32(np, "regulator-min-microvolt", &pval))
		constraints->min_uV = pval;

	if (!of_property_read_u32(np, "regulator-max-microvolt", &pval))
		constraints->max_uV = pval;

	/* Voltage change possible? */
	if (constraints->min_uV != constraints->max_uV)
		constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;

	/* Do we have a voltage range, if so try to apply it? */
	if (constraints->min_uV && constraints->max_uV)
		constraints->apply_uV = true;

	if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval))
		constraints->uV_offset = pval;
	if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
		constraints->min_uA = pval;
	if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
		constraints->max_uA = pval;

	if (!of_property_read_u32(np, &q