drivers/regulator/max77693.c

   1 /*
   2  * max77693.c - Regulator driver for the Maxim 77693
   3  *
   4  * Copyright (C) 2013 Samsung Electronics
   5  * Jonghwa Lee <jonghwa3.lee@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  * This driver is based on max77686.c
  22  */
  23
  24 #include <linux/err.h>
  25 #include <linux/slab.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/module.h>
  28 #include <linux/export.h>
  29 #include <linux/regulator/driver.h>
  30 #include <linux/regulator/machine.h>
  31 #include <linux/mfd/max77693.h>
  32 #include <linux/mfd/max77693-private.h>
  33 #include <linux/regulator/of_regulator.h>
  34
  35 #define CHGIN_ILIM_STEP_20mA                    20000
  36
  37 /* CHARGER regulator ops */
  38 /* CHARGER regulator uses two bits for enabling */
  39 static int max77693_chg_is_enabled(struct regulator_dev *rdev)
  40 {
  41         int ret;
  42         u8 val;
  43
  44         ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
  45         if (ret)
  46                 return ret;
  47
  48         return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
  49 }
  50
  51 /*
  52  * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  53  * 0x00, 0x01, 0x2, 0x03        = 60 mA
  54  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
  55  */
  56 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
  57 {
  58         unsigned int chg_min_uA = rdev->constraints->min_uA;
  59         unsigned int chg_max_uA = rdev->constraints->max_uA;
  60         u8 reg, sel;
  61         unsigned int val;
  62         int ret;
  63
  64         ret = max77693_read_reg(rdev->regmap,
  65                                 MAX77693_CHG_REG_CHG_CNFG_09, &reg);
  66         if (ret < 0)
  67                 return ret;
  68
  69         sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
  70
  71         /* the first four codes for charger current are all 60mA */
  72         if (sel <= 3)
  73                 sel = 0;
  74         else
  75                 sel -= 3;
  76
  77         val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
  78         if (val > chg_max_uA)
  79                 return -EINVAL;
  80
  81         return val;
  82 }
  83
  84 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
  85                                                 int min_uA, int max_uA)
  86 {
  87         unsigned int chg_min_uA = rdev->constraints->min_uA;
  88         int sel = 0;
  89
  90         while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
  91                 sel++;
  92
  93         if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
  94                 return -EINVAL;
  95
  96         /* the first four codes for charger current are all 60mA */
  97         sel += 3;
  98
  99         return max77693_write_reg(rdev->regmap,
 100                                 MAX77693_CHG_REG_CHG_CNFG_09, sel);
 101 }
 102 /* end of CHARGER regulator ops */
 103
 104 static const unsigned int max77693_safeout_table[] = {
 105         4850000,
 106         4900000,
 107         4950000,
 108         3300000,
 109 };
 110
 111 static struct regulator_ops max77693_safeout_ops = {
 112         .list_voltage           = regulator_list_voltage_table,
 113         .is_enabled             = regulator_is_enabled_regmap,
 114         .enable                 = regulator_enable_regmap,
 115         .disable                = regulator_disable_regmap,
 116         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 117         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 118 };
 119
 120 static struct regulator_ops max77693_charger_ops = {
 121         .is_enabled             = max77693_chg_is_enabled,
 122         .enable                 = regulator_enable_regmap,
 123         .disable                = regulator_disable_regmap,
 124         .get_current_limit      = max77693_chg_get_current_limit,
 125         .set_current_limit      = max77693_chg_set_current_limit,
 126 };
 127
 128 #define regulator_desc_esafeout(_num)   {                       \
 129         .name           = "ESAFEOUT"#_num,                      \
 130         .id             = MAX77693_ESAFEOUT##_num,              \
 131         .n_voltages     = 4,                                    \
 132         .ops            = &max77693_safeout_ops,                \
 133         .type           = REGULATOR_VOLTAGE,                    \
 134         .owner          = THIS_MODULE,                          \
 135         .volt_table     = max77693_safeout_table,               \
 136         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 137         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
 138         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 139         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
 140 }
 141
 142 static struct regulator_desc regulators[] = {
 143         regulator_desc_esafeout(1),
 144         regulator_desc_esafeout(2),
 145         {
 146                 .name = "CHARGER",
 147                 .id = MAX77693_CHARGER,
 148                 .ops = &max77693_charger_ops,
 149                 .type = REGULATOR_CURRENT,
 150                 .owner = THIS_MODULE,
 151                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 152                 .enable_mask = CHG_CNFG_00_CHG_MASK |
 153                                 CHG_CNFG_00_BUCK_MASK,
 154         },
 155 };
 156
 157 #ifdef CONFIG_OF
 158 static int max77693_pmic_dt_parse_rdata(struct device *dev,
 159                                         struct max77693_regulator_data **rdata)
 160 {
 161         struct device_node *np;
 162         struct of_regulator_match *rmatch;
 163         struct max77693_regulator_data *tmp;
 164         int i, matched = 0;
 165
 166         np = of_get_child_by_name(dev->parent->of_node, "regulators");
 167         if (!np)
 168                 return -EINVAL;
 169
 170         rmatch = devm_kzalloc(dev,
 171                  sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
 172         if (!rmatch) {
 173                 of_node_put(np);
 174                 return -ENOMEM;
 175         }
 176
 177         for (i = 0; i < ARRAY_SIZE(regulators); i++)
 178                 rmatch[i].name = regulators[i].name;
 179
 180         matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
 181         of_node_put(np);
 182         if (matched <= 0)
 183                 return matched;
 184         *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
 185         if (!(*rdata))
 186                 return -ENOMEM;
 187
 188         tmp = *rdata;
 189
 190         for (i = 0; i < matched; i++) {
 191                 tmp->initdata = rmatch[i].init_data;
 192                 tmp->of_node = rmatch[i].of_node;
 193                 tmp->id = regulators[i].id;
 194                 tmp++;
 195         }
 196
 197         return matched;
 198 }
 199 #else
 200 static int max77693_pmic_dt_parse_rdata(struct device *dev,
 201                                         struct max77693_regulator_data **rdata)
 202 {
 203         return 0;
 204 }
 205 #endif /* CONFIG_OF */
 206
 207 static int max77693_pmic_init_rdata(struct device *dev,
 208                                     struct max77693_regulator_data **rdata)
 209 {
 210         struct max77693_platform_data *pdata;
 211         int num_regulators = 0;
 212
 213         pdata = dev_get_platdata(dev->parent);
 214         if (pdata) {
 215                 *rdata = pdata->regulators;
 216                 num_regulators = pdata->num_regulators;
 217         }
 218
 219         if (!(*rdata) && dev->parent->of_node)
 220                 num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
 221
 222         return num_regulators;
 223 }
 224
 225 static int max77693_pmic_probe(struct platform_device *pdev)
 226 {
 227         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 228         struct max77693_regulator_data *rdata = NULL;
 229         int num_rdata, i;
 230         struct regulator_config config;
 231
 232         num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
 233         if (!rdata || num_rdata <= 0) {
 234                 dev_err(&pdev->dev, "No init data supplied.\n");
 235                 return -ENODEV;
 236         }
 237
 238         config.dev = &pdev->dev;
 239         config.regmap = iodev->regmap;
 240
 241         for (i = 0; i < num_rdata; i++) {
 242                 int id = rdata[i].id;
 243                 struct regulator_dev *rdev;
 244
 245                 config.init_data = rdata[i].initdata;
 246                 config.of_node = rdata[i].of_node;
 247
 248                 rdev = devm_regulator_register(&pdev->dev,
 249                                                 &regulators[id], &config);
 250                 if (IS_ERR(rdev)) {
 251                         dev_err(&pdev->dev,
 252                                 "Failed to initialize regulator-%d\n", id);
 253                         return PTR_ERR(rdev);
 254                 }
 255         }
 256
 257         return 0;
 258 }
 259
 260 static const struct platform_device_id max77693_pmic_id[] = {
 261         {"max77693-pmic", 0},
 262         {},
 263 };
 264
 265 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 266
 267 static struct platform_driver max77693_pmic_driver = {
 268         .driver = {
 269                    .name = "max77693-pmic",
 270                    .owner = THIS_MODULE,
 271                    },
 272         .probe = max77693_pmic_probe,
 273         .id_table = max77693_pmic_id,
 274 };
 275
 276 module_platform_driver(max77693_pmic_driver);
 277
 278 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
 279 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 280 MODULE_LICENSE("GPL");