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1// SPDX-License-Identifier: GPL-2.02//3// Regulator Driver for Freescale MC13xxx PMIC4//5// Copyright 2010 Yong Shen <yong.shen@linaro.org>6//7// Based on mc13783 regulator driver :8// Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>9// Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>10//11// Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file12// from freescale13 14#include <linux/mfd/mc13xxx.h>15#include <linux/regulator/machine.h>16#include <linux/regulator/driver.h>17#include <linux/regulator/of_regulator.h>18#include <linux/platform_device.h>19#include <linux/kernel.h>20#include <linux/slab.h>21#include <linux/init.h>22#include <linux/err.h>23#include <linux/module.h>24#include <linux/of.h>25#include "mc13xxx.h"26 27static int mc13xxx_regulator_enable(struct regulator_dev *rdev)28{29 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);30 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;31 int id = rdev_get_id(rdev);32 33 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);34 35 return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,36 mc13xxx_regulators[id].enable_bit,37 mc13xxx_regulators[id].enable_bit);38}39 40static int mc13xxx_regulator_disable(struct regulator_dev *rdev)41{42 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);43 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;44 int id = rdev_get_id(rdev);45 46 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);47 48 return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,49 mc13xxx_regulators[id].enable_bit, 0);50}51 52static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)53{54 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);55 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;56 int ret, id = rdev_get_id(rdev);57 unsigned int val;58 59 ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);60 if (ret)61 return ret;62 63 return (val & mc13xxx_regulators[id].enable_bit) != 0;64}65 66static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,67 unsigned selector)68{69 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);70 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;71 int id = rdev_get_id(rdev);72 73 return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,74 mc13xxx_regulators[id].vsel_mask,75 selector << mc13xxx_regulators[id].vsel_shift);76}77 78static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)79{80 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);81 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;82 int ret, id = rdev_get_id(rdev);83 unsigned int val;84 85 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);86 87 ret = mc13xxx_reg_read(priv->mc13xxx,88 mc13xxx_regulators[id].vsel_reg, &val);89 if (ret)90 return ret;91 92 val = (val & mc13xxx_regulators[id].vsel_mask)93 >> mc13xxx_regulators[id].vsel_shift;94 95 dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);96 97 BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);98 99 return rdev->desc->volt_table[val];100}101 102const struct regulator_ops mc13xxx_regulator_ops = {103 .enable = mc13xxx_regulator_enable,104 .disable = mc13xxx_regulator_disable,105 .is_enabled = mc13xxx_regulator_is_enabled,106 .list_voltage = regulator_list_voltage_table,107 .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,108 .get_voltage = mc13xxx_regulator_get_voltage,109};110EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);111 112int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,113 int max_uV, unsigned *selector)114{115 int id = rdev_get_id(rdev);116 117 dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",118 __func__, id, min_uV, max_uV);119 120 if (min_uV <= rdev->desc->volt_table[0] &&121 rdev->desc->volt_table[0] <= max_uV) {122 *selector = 0;123 return 0;124 } else {125 return -EINVAL;126 }127}128EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);129 130const struct regulator_ops mc13xxx_fixed_regulator_ops = {131 .enable = mc13xxx_regulator_enable,132 .disable = mc13xxx_regulator_disable,133 .is_enabled = mc13xxx_regulator_is_enabled,134 .list_voltage = regulator_list_voltage_table,135 .set_voltage = mc13xxx_fixed_regulator_set_voltage,136};137EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);138 139#ifdef CONFIG_OF140int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)141{142 struct device_node *parent;143 int num;144 145 if (!pdev->dev.parent->of_node)146 return -ENODEV;147 148 parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");149 if (!parent)150 return -ENODEV;151 152 num = of_get_child_count(parent);153 of_node_put(parent);154 return num;155}156EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);157 158struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(159 struct platform_device *pdev, struct mc13xxx_regulator *regulators,160 int num_regulators)161{162 struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);163 struct mc13xxx_regulator_init_data *data, *p;164 struct device_node *parent, *child;165 int i, parsed = 0;166 167 if (!pdev->dev.parent->of_node)168 return NULL;169 170 parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");171 if (!parent)172 return NULL;173 174 data = devm_kcalloc(&pdev->dev, priv->num_regulators, sizeof(*data),175 GFP_KERNEL);176 if (!data) {177 of_node_put(parent);178 return NULL;179 }180 181 p = data;182 183 for_each_child_of_node(parent, child) {184 int found = 0;185 186 for (i = 0; i < num_regulators; i++) {187 if (!regulators[i].desc.name)188 continue;189 if (of_node_name_eq(child,190 regulators[i].desc.name)) {191 p->id = i;192 p->init_data = of_get_regulator_init_data(193 &pdev->dev, child,194 ®ulators[i].desc);195 p->node = child;196 p++;197 198 parsed++;199 found = 1;200 break;201 }202 }203 204 if (!found)205 dev_warn(&pdev->dev,206 "Unknown regulator: %pOFn\n", child);207 }208 of_node_put(parent);209 210 priv->num_regulators = parsed;211 212 return data;213}214EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);215#endif216 217MODULE_LICENSE("GPL v2");218MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");219MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");220MODULE_ALIAS("mc13xxx-regulator-core");221