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 int mc13xxx_get_best_voltage_index(struct regulator_dev *rdev,
  98                                                 int min_uV, int max_uV)
  99 {
 100         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 101         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 102         int reg_id = rdev_get_id(rdev);
 103         int i;
 104         int bestmatch;
 105         int bestindex;
 106
 107         /*
 108          * Locate the minimum voltage fitting the criteria on
 109          * this regulator. The switchable voltages are not
 110          * in strict falling order so we need to check them
 111          * all for the best match.
 112          */
 113         bestmatch = INT_MAX;
 114         bestindex = -1;
 115         for (i = 0; i < mc13xxx_regulators[reg_id].desc.n_voltages; i++) {
 116                 if (mc13xxx_regulators[reg_id].voltages[i] >= min_uV &&
 117                     mc13xxx_regulators[reg_id].voltages[i] < bestmatch) {
 118                         bestmatch = mc13xxx_regulators[reg_id].voltages[i];
 119                         bestindex = i;
 120                 }
 121         }
 122
 123         if (bestindex < 0 || bestmatch > max_uV) {
 124                 dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n",
 125                                 min_uV, max_uV);
 126                 return -EINVAL;
 127         }
 128         return bestindex;
 129 }
 130 EXPORT_SYMBOL_GPL(mc13xxx_get_best_voltage_index);
 131
 132 static int mc13xxx_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
 133                 int max_uV, unsigned *selector)
 134 {
 135         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 136         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 137         int value, id = rdev_get_id(rdev);
 138         int ret;
 139
 140         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 141                 __func__, id, min_uV, max_uV);
 142
 143         /* Find the best index */
 144         value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV);
 145         dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value);
 146         if (value < 0)
 147                 return value;
 148
 149         mc13xxx_lock(priv->mc13xxx);
 150         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
 151                         mc13xxx_regulators[id].vsel_mask,
 152                         value << mc13xxx_regulators[id].vsel_shift);
 153         mc13xxx_unlock(priv->mc13xxx);
 154
 155         return ret;
 156 }
 157
 158 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
 159 {
 160         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 161         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 162         int ret, id = rdev_get_id(rdev);
 163         unsigned int val;
 164
 165         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
 166
 167         mc13xxx_lock(priv->mc13xxx);
 168         ret = mc13xxx_reg_read(priv->mc13xxx,
 169                                 mc13xxx_regulators[id].vsel_reg, &val);
 170         mc13xxx_unlock(priv->mc13xxx);
 171
 172         if (ret)
 173                 return ret;
 174
 175         val = (val & mc13xxx_regulators[id].vsel_mask)
 176                 >> mc13xxx_regulators[id].vsel_shift;
 177
 178         dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
 179
 180         BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
 181
 182         return mc13xxx_regulators[id].voltages[val];
 183 }
 184
 185 struct regulator_ops mc13xxx_regulator_ops = {
 186         .enable = mc13xxx_regulator_enable,
 187         .disable = mc13xxx_regulator_disable,
 188         .is_enabled = mc13xxx_regulator_is_enabled,
 189         .list_voltage = mc13xxx_regulator_list_voltage,
 190         .set_voltage = mc13xxx_regulator_set_voltage,
 191         .get_voltage = mc13xxx_regulator_get_voltage,
 192 };
 193 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
 194
 195 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
 196                int max_uV, unsigned *selector)
 197 {
 198         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 199         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 200         int id = rdev_get_id(rdev);
 201
 202         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 203                 __func__, id, min_uV, max_uV);
 204
 205         if (min_uV >= mc13xxx_regulators[id].voltages[0] &&
 206             max_uV <= mc13xxx_regulators[id].voltages[0])
 207                 return 0;
 208         else
 209                 return -EINVAL;
 210 }
 211 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
 212
 213 int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
 214 {
 215         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 216         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 217         int id = rdev_get_id(rdev);
 218
 219         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
 220
 221         return mc13xxx_regulators[id].voltages[0];
 222 }
 223 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
 224
 225 struct regulator_ops mc13xxx_fixed_regulator_ops = {
 226         .enable = mc13xxx_regulator_enable,
 227         .disable = mc13xxx_regulator_disable,
 228         .is_enabled = mc13xxx_regulator_is_enabled,
 229         .list_voltage = mc13xxx_regulator_list_voltage,
 230         .set_voltage = mc13xxx_fixed_regulator_set_voltage,
 231         .get_voltage = mc13xxx_fixed_regulator_get_voltage,
 232 };
 233 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
 234
 235 int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev)
 236 {
 237         return 1;
 238 }
 239 EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled);
 240
 241 #ifdef CONFIG_OF
 242 int __devinit mc13xxx_get_num_regulators_dt(struct platform_device *pdev)
 243 {
 244         struct device_node *parent, *child;
 245         int num = 0;
 246
 247         of_node_get(pdev->dev.parent->of_node);
 248         parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
 249         if (!parent)
 250                 return -ENODEV;
 251
 252         for_each_child_of_node(parent, child)
 253                 num++;
 254
 255         return num;
 256 }
 257 EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt);
 258
 259 struct mc13xxx_regulator_init_data * __devinit mc13xxx_parse_regulators_dt(
 260         struct platform_device *pdev, struct mc13xxx_regulator *regulators,
 261         int num_regulators)
 262 {
 263         struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev);
 264         struct mc13xxx_regulator_init_data *data, *p;
 265         struct device_node *parent, *child;
 266         int i;
 267
 268         of_node_get(pdev->dev.parent->of_node);
 269         parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators");
 270         if (!parent)
 271                 return NULL;
 272
 273         data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators,
 274                             GFP_KERNEL);
 275         if (!data)
 276                 return NULL;
 277         p = data;
 278
 279         for_each_child_of_node(parent, child) {
 280                 for (i = 0; i < num_regulators; i++) {
 281                         if (!of_node_cmp(child->name,
 282                                          regulators[i].desc.name)) {
 283                                 p->id = i;
 284                                 p->init_data = of_get_regulator_init_data(
 285                                                         &pdev->dev, child);
 286                                 p->node = child;
 287                                 p++;
 288                                 break;
 289                         }
 290                 }
 291         }
 292
 293         return data;
 294 }
 295 EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt);
 296 #endif
 297
 298 MODULE_LICENSE("GPL v2");
 299 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 300 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
 301 MODULE_ALIAS("mc13xxx-regulator-core");