drivers/regulator/mc13xxx-regulator-core.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Regulator Driver for Freescale MC13xxx PMIC
   4 //
   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 file
  12 // from freescale
  13
  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
  27 static 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
  40 static 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
  52 static 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
  66 static 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
  78 static 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
 102 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 };
 110 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
 111
 112 int 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 }
 128 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
 129
 130 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 };
 137 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
 138
 139 #ifdef CONFIG_OF
 140 int 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 }
 156 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
 157
 158 struct 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_cmp(child->name,
 190                                          regulators[i].desc.name)) {
 191                                 p->id = i;
 192                                 p->init_data = of_get_regulator_init_data(
 193                                                         &pdev->dev, child,
 194                                                         &regulators[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 }
 214 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
 215 #endif
 216
 217 MODULE_LICENSE("GPL v2");
 218 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 219 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
 220 MODULE_ALIAS("mc13xxx-regulator-core");