drivers/regulator/mc13xxx-regulator-core.c

   1 /*
   2  * Regulator Driver for Freescale MC13xxx PMIC
   3  *
   4  * Copyright 2010 Yong Shen <yong.shen@linaro.org>
   5  *
   6  * Based on mc13783 regulator driver :
   7  * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
   8  * Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
  15  * from freescale
  16  */
  17
  18 #include <linux/mfd/mc13xxx.h>
  19 #include <linux/regulator/machine.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/of_regulator.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/kernel.h>
  24 #include <linux/slab.h>
  25 #include <linux/init.h>
  26 #include <linux/err.h>
  27 #include <linux/module.h>
  28 #include <linux/of.h>
  29 #include "mc13xxx.h"
  30
  31 static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
  32 {
  33         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  34         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  35         int id = rdev_get_id(rdev);
  36         int ret;
  37
  38         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
  39
  40         mc13xxx_lock(priv->mc13xxx);
  41         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
  42                         mc13xxx_regulators[id].enable_bit,
  43                         mc13xxx_regulators[id].enable_bit);
  44         mc13xxx_unlock(priv->mc13xxx);
  45
  46         return ret;
  47 }
  48
  49 static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
  50 {
  51         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  52         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  53         int id = rdev_get_id(rdev);
  54         int ret;
  55
  56         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
  57
  58         mc13xxx_lock(priv->mc13xxx);
  59         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
  60                         mc13xxx_regulators[id].enable_bit, 0);
  61         mc13xxx_unlock(priv->mc13xxx);
  62
  63         return ret;
  64 }
  65
  66 static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
  67 {
  68         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  69         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  70         int ret, id = rdev_get_id(rdev);
  71         unsigned int val;
  72
  73         mc13xxx_lock(priv->mc13xxx);
  74         ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
  75         mc13xxx_unlock(priv->mc13xxx);
  76
  77         if (ret)
  78                 return ret;
  79
  80         return (val & mc13xxx_regulators[id].enable_bit) != 0;
  81 }
  82
  83 static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
  84                                              unsigned selector)
  85 {
  86         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  87         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  88         int id = rdev_get_id(rdev);
  89         int ret;
  90
  91         mc13xxx_lock(priv->mc13xxx);
  92         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
  93                         mc13xxx_regulators[id].vsel_mask,
  94                         selector << mc13xxx_regulators[id].vsel_shift);
  95         mc13xxx_unlock(priv->mc13xxx);
  96
  97         return ret;
  98 }
  99
 100 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
 101 {
 102         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 103         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 104         int ret, id = rdev_get_id(rdev);
 105         unsigned int val;
 106
 107         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
 108
 109         mc13xxx_lock(priv->mc13xxx);
 110         ret = mc13xxx_reg_read(priv->mc13xxx,
 111                                 mc13xxx_regulators[id].vsel_reg, &val);
 112         mc13xxx_unlock(priv->mc13xxx);
 113
 114         if (ret)
 115                 return ret;
 116
 117         val = (val & mc13xxx_regulators[id].vsel_mask)
 118                 >> mc13xxx_regulators[id].vsel_shift;
 119
 120         dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
 121
 122         BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
 123
 124         return rdev->desc->volt_table[val];
 125 }
 126
 127 struct regulator_ops mc13xxx_regulator_ops = {
 128         .enable = mc13xxx_regulator_enable,
 129         .disable = mc13xxx_regulator_disable,
 130         .is_enabled = mc13xxx_regulator_is_enabled,
 131         .list_voltage = regulator_list_voltage_table,
 132         .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
 133         .get_voltage = mc13xxx_regulator_get_voltage,
 134 };
 135 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
 136
 137 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
 138                int max_uV, unsigned *selector)
 139 {
 140         int id = rdev_get_id(rdev);
 141
 142         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 143                 __func__, id, min_uV, max_uV);
 144
 145         if (min_uV <= rdev->desc->volt_table[0] &&
 146             rdev->desc->volt_table[0] <= max_uV) {
 147                 *selector = 0;
 148                 return 0;
 149         } else {
 150                 return -EINVAL;
 151         }
 152 }
 153 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
 154
 155 struct regulator_ops mc13xxx_fixed_regulator_ops = {
 156         .enable = mc13xxx_regulator_enable,
 157         .disable = mc13xxx_regulator_disable,
 158         .is_enabled = mc13xxx_regulator_is_enabled,
 159         .list_voltage = regulator_list_voltage_table,
 160         .set_voltage = mc13xxx_fixed_regulator_set_voltage,
 161 };
 162 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
 163
 164 #ifdef CONFIG_OF
 165 int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
 166 {
 167         struct device_node *parent;
 168         int num;
 169
 170         of_node_get(pdev->dev.parent->of_node);
 171         parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
 172         if (!parent)
 173                 return -ENODEV;
 174
 175         num = of_get_child_count(parent);
 176         of_node_put(parent);
 177         return num;
 178 }
 179 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
 180
 181 struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
 182         struct platform_device *pdev, struct mc13xxx_regulator *regulators,
 183         int num_regulators)
 184 {
 185         struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
 186         struct mc13xxx_regulator_init_data *data, *p;
 187         struct device_node *parent, *child;
 188         int i, parsed = 0;
 189
 190         of_node_get(pdev->dev.parent->of_node);
 191         parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
 192         if (!parent)
 193                 return NULL;
 194
 195         data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
 196                             GFP_KERNEL);
 197         if (!data) {
 198                 of_node_put(parent);
 199                 return NULL;
 200         }
 201
 202         p = data;
 203
 204         for_each_child_of_node(parent, child) {
 205                 int found = 0;
 206
 207                 for (i = 0; i < num_regulators; i++) {
 208                         if (!regulators[i].desc.name)
 209                                 continue;
 210                         if (!of_node_cmp(child->name,
 211                                          regulators[i].desc.name)) {
 212                                 p->id = i;
 213                                 p->init_data = of_get_regulator_init_data(
 214                                                         &pdev->dev, child);
 215                                 p->node = child;
 216                                 p++;
 217
 218                                 parsed++;
 219                                 found = 1;
 220                                 break;
 221                         }
 222                 }
 223
 224                 if (!found)
 225                         dev_warn(&pdev->dev,
 226                                  "Unknown regulator: %s\n", child->name);
 227         }
 228         of_node_put(parent);
 229
 230         priv->num_regulators = parsed;
 231
 232         return data;
 233 }
 234 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
 235 #endif
 236
 237 MODULE_LICENSE("GPL v2");
 238 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 239 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
 240 MODULE_ALIAS("mc13xxx-regulator-core");