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
  37         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
  38
  39         return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
  40                                mc13xxx_regulators[id].enable_bit,
  41                                mc13xxx_regulators[id].enable_bit);
  42 }
  43
  44 static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
  45 {
  46         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  47         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  48         int id = rdev_get_id(rdev);
  49
  50         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
  51
  52         return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
  53                                mc13xxx_regulators[id].enable_bit, 0);
  54 }
  55
  56 static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
  57 {
  58         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  59         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  60         int ret, id = rdev_get_id(rdev);
  61         unsigned int val;
  62
  63         ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
  64         if (ret)
  65                 return ret;
  66
  67         return (val & mc13xxx_regulators[id].enable_bit) != 0;
  68 }
  69
  70 static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
  71                                              unsigned selector)
  72 {
  73         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  74         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  75         int id = rdev_get_id(rdev);
  76
  77         return mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
  78                                mc13xxx_regulators[id].vsel_mask,
  79                                selector << mc13xxx_regulators[id].vsel_shift);
  80 }
  81
  82 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
  83 {
  84         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  85         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  86         int ret, id = rdev_get_id(rdev);
  87         unsigned int val;
  88
  89         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
  90
  91         ret = mc13xxx_reg_read(priv->mc13xxx,
  92                                 mc13xxx_regulators[id].vsel_reg, &val);
  93         if (ret)
  94                 return ret;
  95
  96         val = (val & mc13xxx_regulators[id].vsel_mask)
  97                 >> mc13xxx_regulators[id].vsel_shift;
  98
  99         dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
 100
 101         BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
 102
 103         return rdev->desc->volt_table[val];
 104 }
 105
 106 struct regulator_ops mc13xxx_regulator_ops = {
 107         .enable = mc13xxx_regulator_enable,
 108         .disable = mc13xxx_regulator_disable,
 109         .is_enabled = mc13xxx_regulator_is_enabled,
 110         .list_voltage = regulator_list_voltage_table,
 111         .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
 112         .get_voltage = mc13xxx_regulator_get_voltage,
 113 };
 114 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
 115
 116 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
 117                int max_uV, unsigned *selector)
 118 {
 119         int id = rdev_get_id(rdev);
 120
 121         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 122                 __func__, id, min_uV, max_uV);
 123
 124         if (min_uV <= rdev->desc->volt_table[0] &&
 125             rdev->desc->volt_table[0] <= max_uV) {
 126                 *selector = 0;
 127                 return 0;
 128         } else {
 129                 return -EINVAL;
 130         }
 131 }
 132 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
 133
 134 struct regulator_ops mc13xxx_fixed_regulator_ops = {
 135         .enable = mc13xxx_regulator_enable,
 136         .disable = mc13xxx_regulator_disable,
 137         .is_enabled = mc13xxx_regulator_is_enabled,
 138         .list_voltage = regulator_list_voltage_table,
 139         .set_voltage = mc13xxx_fixed_regulator_set_voltage,
 140 };
 141 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
 142
 143 #ifdef CONFIG_OF
 144 int mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
 145 {
 146         struct device_node *parent;
 147         int num;
 148
 149         if (!pdev->dev.parent->of_node)
 150                 return -ENODEV;
 151
 152         parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
 153         if (!parent)
 154                 return -ENODEV;
 155
 156         num = of_get_child_count(parent);
 157         of_node_put(parent);
 158         return num;
 159 }
 160 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
 161
 162 struct mc13xxx_regulator_init_data *mc13xxx_parse_regulators_dt(
 163         struct platform_device *pdev, struct mc13xxx_regulator *regulators,
 164         int num_regulators)
 165 {
 166         struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
 167         struct mc13xxx_regulator_init_data *data, *p;
 168         struct device_node *parent, *child;
 169         int i, parsed = 0;
 170
 171         if (!pdev->dev.parent->of_node)
 172                 return NULL;
 173
 174         parent = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
 175         if (!parent)
 176                 return NULL;
 177
 178         data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
 179                             GFP_KERNEL);
 180         if (!data) {
 181                 of_node_put(parent);
 182                 return NULL;
 183         }
 184
 185         p = data;
 186
 187         for_each_child_of_node(parent, child) {
 188                 int found = 0;
 189
 190                 for (i = 0; i < num_regulators; i++) {
 191                         if (!regulators[i].desc.name)
 192                                 continue;
 193                         if (!of_node_cmp(child->name,
 194                                          regulators[i].desc.name)) {
 195                                 p->id = i;
 196                                 p->init_data = of_get_regulator_init_data(
 197                                                         &pdev->dev, child,
 198                                                         &regulators[i].desc);
 199                                 p->node = child;
 200                                 p++;
 201
 202                                 parsed++;
 203                                 found = 1;
 204                                 break;
 205                         }
 206                 }
 207
 208                 if (!found)
 209                         dev_warn(&pdev->dev,
 210                                  "Unknown regulator: %s\n", child->name);
 211         }
 212         of_node_put(parent);
 213
 214         priv->num_regulators = parsed;
 215
 216         return data;
 217 }
 218 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
 219 #endif
 220
 221 MODULE_LICENSE("GPL v2");
 222 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 223 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
 224 MODULE_ALIAS("mc13xxx-regulator-core");