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/platform_device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/slab.h>
  24 #include <linux/init.h>
  25 #include <linux/err.h>
  26 #include "mc13xxx.h"
  27
  28 static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
  29 {
  30         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  31         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  32         int id = rdev_get_id(rdev);
  33         int ret;
  34
  35         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
  36
  37         mc13xxx_lock(priv->mc13xxx);
  38         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
  39                         mc13xxx_regulators[id].enable_bit,
  40                         mc13xxx_regulators[id].enable_bit);
  41         mc13xxx_unlock(priv->mc13xxx);
  42
  43         return ret;
  44 }
  45
  46 static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
  47 {
  48         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  49         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  50         int id = rdev_get_id(rdev);
  51         int ret;
  52
  53         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
  54
  55         mc13xxx_lock(priv->mc13xxx);
  56         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
  57                         mc13xxx_regulators[id].enable_bit, 0);
  58         mc13xxx_unlock(priv->mc13xxx);
  59
  60         return ret;
  61 }
  62
  63 static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
  64 {
  65         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  66         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  67         int ret, id = rdev_get_id(rdev);
  68         unsigned int val;
  69
  70         mc13xxx_lock(priv->mc13xxx);
  71         ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
  72         mc13xxx_unlock(priv->mc13xxx);
  73
  74         if (ret)
  75                 return ret;
  76
  77         return (val & mc13xxx_regulators[id].enable_bit) != 0;
  78 }
  79
  80 int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev,
  81                                                 unsigned selector)
  82 {
  83         int id = rdev_get_id(rdev);
  84         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  85         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  86
  87         if (selector >= mc13xxx_regulators[id].desc.n_voltages)
  88                 return -EINVAL;
  89
  90         return mc13xxx_regulators[id].voltages[selector];
  91 }
  92 EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage);
  93
  94 int mc13xxx_get_best_voltage_index(struct regulator_dev *rdev,
  95                                                 int min_uV, int max_uV)
  96 {
  97         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
  98         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
  99         int reg_id = rdev_get_id(rdev);
 100         int i;
 101         int bestmatch;
 102         int bestindex;
 103
 104         /*
 105          * Locate the minimum voltage fitting the criteria on
 106          * this regulator. The switchable voltages are not
 107          * in strict falling order so we need to check them
 108          * all for the best match.
 109          */
 110         bestmatch = INT_MAX;
 111         bestindex = -1;
 112         for (i = 0; i < mc13xxx_regulators[reg_id].desc.n_voltages; i++) {
 113                 if (mc13xxx_regulators[reg_id].voltages[i] >= min_uV &&
 114                     mc13xxx_regulators[reg_id].voltages[i] < bestmatch) {
 115                         bestmatch = mc13xxx_regulators[reg_id].voltages[i];
 116                         bestindex = i;
 117                 }
 118         }
 119
 120         if (bestindex < 0 || bestmatch > max_uV) {
 121                 dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n",
 122                                 min_uV, max_uV);
 123                 return -EINVAL;
 124         }
 125         return bestindex;
 126 }
 127 EXPORT_SYMBOL_GPL(mc13xxx_get_best_voltage_index);
 128
 129 static int mc13xxx_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
 130                 int max_uV, unsigned *selector)
 131 {
 132         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 133         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 134         int value, id = rdev_get_id(rdev);
 135         int ret;
 136
 137         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 138                 __func__, id, min_uV, max_uV);
 139
 140         /* Find the best index */
 141         value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV);
 142         dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value);
 143         if (value < 0)
 144                 return value;
 145
 146         mc13xxx_lock(priv->mc13xxx);
 147         ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
 148                         mc13xxx_regulators[id].vsel_mask,
 149                         value << mc13xxx_regulators[id].vsel_shift);
 150         mc13xxx_unlock(priv->mc13xxx);
 151
 152         return ret;
 153 }
 154
 155 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
 156 {
 157         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 158         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 159         int ret, id = rdev_get_id(rdev);
 160         unsigned int val;
 161
 162         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
 163
 164         mc13xxx_lock(priv->mc13xxx);
 165         ret = mc13xxx_reg_read(priv->mc13xxx,
 166                                 mc13xxx_regulators[id].vsel_reg, &val);
 167         mc13xxx_unlock(priv->mc13xxx);
 168
 169         if (ret)
 170                 return ret;
 171
 172         val = (val & mc13xxx_regulators[id].vsel_mask)
 173                 >> mc13xxx_regulators[id].vsel_shift;
 174
 175         dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
 176
 177         BUG_ON(val < 0 || val > mc13xxx_regulators[id].desc.n_voltages);
 178
 179         return mc13xxx_regulators[id].voltages[val];
 180 }
 181
 182 struct regulator_ops mc13xxx_regulator_ops = {
 183         .enable = mc13xxx_regulator_enable,
 184         .disable = mc13xxx_regulator_disable,
 185         .is_enabled = mc13xxx_regulator_is_enabled,
 186         .list_voltage = mc13xxx_regulator_list_voltage,
 187         .set_voltage = mc13xxx_regulator_set_voltage,
 188         .get_voltage = mc13xxx_regulator_get_voltage,
 189 };
 190 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
 191
 192 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
 193                int max_uV, unsigned *selector)
 194 {
 195         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 196         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 197         int id = rdev_get_id(rdev);
 198
 199         dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
 200                 __func__, id, min_uV, max_uV);
 201
 202         if (min_uV >= mc13xxx_regulators[id].voltages[0] &&
 203             max_uV <= mc13xxx_regulators[id].voltages[0])
 204                 return 0;
 205         else
 206                 return -EINVAL;
 207 }
 208 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
 209
 210 int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
 211 {
 212         struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
 213         struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
 214         int id = rdev_get_id(rdev);
 215
 216         dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
 217
 218         return mc13xxx_regulators[id].voltages[0];
 219 }
 220 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
 221
 222 struct regulator_ops mc13xxx_fixed_regulator_ops = {
 223         .enable = mc13xxx_regulator_enable,
 224         .disable = mc13xxx_regulator_disable,
 225         .is_enabled = mc13xxx_regulator_is_enabled,
 226         .list_voltage = mc13xxx_regulator_list_voltage,
 227         .set_voltage = mc13xxx_fixed_regulator_set_voltage,
 228         .get_voltage = mc13xxx_fixed_regulator_get_voltage,
 229 };
 230 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
 231
 232 int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev)
 233 {
 234         return 1;
 235 }
 236 EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled);
 237
 238 MODULE_LICENSE("GPL v2");
 239 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
 240 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
 241 MODULE_ALIAS("mc13xxx-regulator-core");