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 int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev,
  84                                                 unsigned selector)
  85 {
  86         int id = rdev_get_id(rdev);
  87         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  88         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  89
  90         if (selector >= mc13xxx_regulators[id].desc.n_voltages)
  91                 return -EINVAL;
  92
  93         return mc13xxx_regulators[id].voltages[selector];
  94 }
  95 EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage);
  96
  97 static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev,
  98                                              unsigned selector)
  99 {
 100         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 101         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 102         int id = rdev_get_id(rdev);
 103         int ret;
 104
 105         mc13xxx_lock(priv->mc13xxx);
 106         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
 107                         mc13xxx_regulators[id].vsel_mask,
 108                         selector << mc13xxx_regulators[id].vsel_shift);
 109         mc13xxx_unlock(priv->mc13xxx);
 110
 111         return ret;
 112 }
 113
 114 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
 115 {
 116         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 117         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 118         int ret, id = rdev_get_id(rdev);
 119         unsigned int val;
 120
 121         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
 122
 123         mc13xxx_lock(priv->mc13xxx);
 124         ret = mc13xxx_reg_read(priv->mc13xxx,
 125                                 mc13xxx_regulators[id].vsel_reg, &val);
 126         mc13xxx_unlock(priv->mc13xxx);
 127
 128         if (ret)
 129                 return ret;
 130
 131         val = (val & mc13xxx_regulators[id].vsel_mask)
 132                 >> mc13xxx_regulators[id].vsel_shift;
 133
 134         dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
 135
 136         BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
 137
 138         return mc13xxx_regulators[id].voltages[val];
 139 }
 140
 141 struct regulator_ops mc13xxx_regulator_ops = {
 142         .enable = mc13xxx_regulator_enable,
 143         .disable = mc13xxx_regulator_disable,
 144         .is_enabled = mc13xxx_regulator_is_enabled,
 145         .list_voltage = mc13xxx_regulator_list_voltage,
 146         .set_voltage_sel = mc13xxx_regulator_set_voltage_sel,
 147         .get_voltage = mc13xxx_regulator_get_voltage,
 148 };
 149 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
 150
 151 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
 152                int max_uV, unsigned *selector)
 153 {
 154         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 155         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 156         int id = rdev_get_id(rdev);
 157
 158         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 159                 __func__, id, min_uV, max_uV);
 160
 161         if (min_uV >= mc13xxx_regulators[id].voltages[0] &&
 162             max_uV <= mc13xxx_regulators[id].voltages[0])
 163                 return 0;
 164         else
 165                 return -EINVAL;
 166 }
 167 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
 168
 169 int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
 170 {
 171         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 172         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 173         int id = rdev_get_id(rdev);
 174
 175         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
 176
 177         return mc13xxx_regulators[id].voltages[0];
 178 }
 179 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
 180
 181 struct regulator_ops mc13xxx_fixed_regulator_ops = {
 182         .enable = mc13xxx_regulator_enable,
 183         .disable = mc13xxx_regulator_disable,
 184         .is_enabled = mc13xxx_regulator_is_enabled,
 185         .list_voltage = mc13xxx_regulator_list_voltage,
 186         .set_voltage = mc13xxx_fixed_regulator_set_voltage,
 187         .get_voltage = mc13xxx_fixed_regulator_get_voltage,
 188 };
 189 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
 190
 191 int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev)
 192 {
 193         return 1;
 194 }
 195 EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled);
 196
 197 #ifdef CONFIG_OF
 198 int __devinit mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
 199 {
 200         struct device_node *parent, *child;
 201         int num = 0;
 202
 203         of_node_get(pdev->dev.parent->of_node);
 204         parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
 205         if (!parent)
 206                 return -ENODEV;
 207
 208         for_each_child_of_node(parent, child)
 209                 num++;
 210
 211         return num;
 212 }
 213 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
 214
 215 struct mc13xxx_regulator_init_data * __devinit mc13xxx_parse_regulators_dt(
 216         struct platform_device *pdev, struct mc13xxx_regulator *regulators,
 217         int num_regulators)
 218 {
 219         struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
 220         struct mc13xxx_regulator_init_data *data, *p;
 221         struct device_node *parent, *child;
 222         int i;
 223
 224         of_node_get(pdev->dev.parent->of_node);
 225         parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
 226         if (!parent)
 227                 return NULL;
 228
 229         data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
 230                             GFP_KERNEL);
 231         if (!data)
 232                 return NULL;
 233         p = data;
 234
 235         for_each_child_of_node(parent, child) {
 236                 for (i = 0; i < num_regulators; i++) {
 237                         if (!of_node_cmp(child->name,
 238                                          regulators[i].desc.name)) {
 239                                 p->id = i;
 240                                 p->init_data = of_get_regulator_init_data(
 241                                                         &pdev->dev, child);
 242                                 p->node = child;
 243                                 p++;
 244                                 break;
 245                         }
 246                 }
 247         }
 248
 249         return data;
 250 }
 251 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
 252 #endif
 253
 254 MODULE_LICENSE("GPL v2");
 255 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 256 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
 257 MODULE_ALIAS("mc13xxx-regulator-core");