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 struct max77693_pmic_dev {
  38         struct device *dev;
  39         struct max77693_dev *iodev;
  40         int num_regulators;
  41         struct regulator_dev **rdev;
  42 };
  43
  44 /* CHARGER regulator ops */
  45 /* CHARGER regulator uses two bits for enabling */
  46 static int max77693_chg_is_enabled(struct regulator_dev *rdev)
  47 {
  48         int ret;
  49         u8 val;
  50
  51         ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
  52         if (ret)
  53                 return ret;
  54
  55         return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
  56 }
  57
  58 /*
  59  * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  60  * 0x00, 0x01, 0x2, 0x03        = 60 mA
  61  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
  62  */
  63 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
  64 {
  65         unsigned int chg_min_uA = rdev->constraints->min_uA;
  66         unsigned int chg_max_uA = rdev->constraints->max_uA;
  67         u8 reg, sel;
  68         unsigned int val;
  69         int ret;
  70
  71         ret = max77693_read_reg(rdev->regmap,
  72                                 MAX77693_CHG_REG_CHG_CNFG_09, &reg);
  73         if (ret < 0)
  74                 return ret;
  75
  76         sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
  77
  78         /* the first four codes for charger current are all 60mA */
  79         if (sel <= 3)
  80                 sel = 0;
  81         else
  82                 sel -= 3;
  83
  84         val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
  85         if (val > chg_max_uA)
  86                 return -EINVAL;
  87
  88         return val;
  89 }
  90
  91 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
  92                                                 int min_uA, int max_uA)
  93 {
  94         unsigned int chg_min_uA = rdev->constraints->min_uA;
  95         int sel = 0;
  96
  97         while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
  98                 sel++;
  99
 100         if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
 101                 return -EINVAL;
 102
 103         /* the first four codes for charger current are all 60mA */
 104         sel += 3;
 105
 106         return max77693_write_reg(rdev->regmap,
 107                                 MAX77693_CHG_REG_CHG_CNFG_09, sel);
 108 }
 109 /* end of CHARGER regulator ops */
 110
 111 static const unsigned int max77693_safeout_table[] = {
 112         4850000,
 113         4900000,
 114         4950000,
 115         3300000,
 116 };
 117
 118 static struct regulator_ops max77693_safeout_ops = {
 119         .list_voltage           = regulator_list_voltage_table,
 120         .is_enabled             = regulator_is_enabled_regmap,
 121         .enable                 = regulator_enable_regmap,
 122         .disable                = regulator_disable_regmap,
 123         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 124         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 125 };
 126
 127 static struct regulator_ops max77693_charger_ops = {
 128         .is_enabled             = max77693_chg_is_enabled,
 129         .enable                 = regulator_enable_regmap,
 130         .disable                = regulator_disable_regmap,
 131         .get_current_limit      = max77693_chg_get_current_limit,
 132         .set_current_limit      = max77693_chg_set_current_limit,
 133 };
 134
 135 #define regulator_desc_esafeout(_num)   {                       \
 136         .name           = "ESAFEOUT"#_num,                      \
 137         .id             = MAX77693_ESAFEOUT##_num,              \
 138         .n_voltages     = 4,                                    \
 139         .ops            = &max77693_safeout_ops,                \
 140         .type           = REGULATOR_VOLTAGE,                    \
 141         .volt_table     = max77693_safeout_table,               \
 142         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 143         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
 144         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 145         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
 146 }
 147
 148 static struct regulator_desc regulators[] = {
 149         regulator_desc_esafeout(1),
 150         regulator_desc_esafeout(2),
 151         {
 152                 .name = "CHARGER",
 153                 .id = MAX77693_CHARGER,
 154                 .ops = &max77693_charger_ops,
 155                 .type = REGULATOR_CURRENT,
 156                 .owner = THIS_MODULE,
 157                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 158                 .enable_mask = CHG_CNFG_00_CHG_MASK |
 159                                 CHG_CNFG_00_BUCK_MASK,
 160         },
 161 };
 162
 163 #ifdef CONFIG_OF
 164 static int max77693_pmic_dt_parse_rdata(struct device *dev,
 165                                         struct max77693_regulator_data **rdata)
 166 {
 167         struct device_node *np;
 168         struct of_regulator_match *rmatch;
 169         struct max77693_regulator_data *tmp;
 170         int i, matched = 0;
 171
 172         np = of_find_node_by_name(dev->parent->of_node, "regulators");
 173         if (!np)
 174                 return -EINVAL;
 175
 176         rmatch = devm_kzalloc(dev,
 177                  sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
 178         if (!rmatch)
 179                 return -ENOMEM;
 180
 181         for (i = 0; i < ARRAY_SIZE(regulators); i++)
 182                 rmatch[i].name = regulators[i].name;
 183
 184         matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
 185         if (matched <= 0)
 186                 return matched;
 187         *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
 188         if (!(*rdata))
 189                 return -ENOMEM;
 190
 191         tmp = *rdata;
 192
 193         for (i = 0; i < matched; i++) {
 194                 tmp->initdata = rmatch[i].init_data;
 195                 tmp->of_node = rmatch[i].of_node;
 196                 tmp->id = regulators[i].id;
 197                 tmp++;
 198         }
 199
 200         return matched;
 201 }
 202 #else
 203 static int max77693_pmic_dt_parse_rdata(struct device *dev,
 204                                         struct max77693_regulator_data **rdata)
 205 {
 206         return 0;
 207 }
 208 #endif /* CONFIG_OF */
 209
 210 static int max77693_pmic_init_rdata(struct device *dev,
 211                                     struct max77693_regulator_data **rdata)
 212 {
 213         struct max77693_platform_data *pdata;
 214         int num_regulators = 0;
 215
 216         pdata = dev_get_platdata(dev->parent);
 217         if (pdata) {
 218                 *rdata = pdata->regulators;
 219                 num_regulators = pdata->num_regulators;
 220         }
 221
 222         if (!(*rdata) && dev->parent->of_node)
 223                 num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
 224
 225         return num_regulators;
 226 }
 227
 228 static int max77693_pmic_probe(struct platform_device *pdev)
 229 {
 230         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 231         struct max77693_pmic_dev *max77693_pmic;
 232         struct max77693_regulator_data *rdata = NULL;
 233         int num_rdata, i;
 234         struct regulator_config config;
 235
 236         num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
 237         if (!rdata || num_rdata <= 0) {
 238                 dev_err(&pdev->dev, "No init data supplied.\n");
 239                 return -ENODEV;
 240         }
 241
 242         max77693_pmic = devm_kzalloc(&pdev->dev,
 243                                 sizeof(struct max77693_pmic_dev),
 244                                 GFP_KERNEL);
 245         if (!max77693_pmic)
 246                 return -ENOMEM;
 247
 248         max77693_pmic->rdev = devm_kzalloc(&pdev->dev,
 249                                 sizeof(struct regulator_dev *) * num_rdata,
 250                                 GFP_KERNEL);
 251         if (!max77693_pmic->rdev)
 252                 return -ENOMEM;
 253
 254         max77693_pmic->dev = &pdev->dev;
 255         max77693_pmic->iodev = iodev;
 256         max77693_pmic->num_regulators = num_rdata;
 257
 258         config.dev = &pdev->dev;
 259         config.regmap = iodev->regmap;
 260         config.driver_data = max77693_pmic;
 261         platform_set_drvdata(pdev, max77693_pmic);
 262
 263         for (i = 0; i < max77693_pmic->num_regulators; i++) {
 264                 int id = rdata[i].id;
 265
 266                 config.init_data = rdata[i].initdata;
 267                 config.of_node = rdata[i].of_node;
 268
 269                 max77693_pmic->rdev[i] = devm_regulator_register(&pdev->dev,
 270                                                 &regulators[id], &config);
 271                 if (IS_ERR(max77693_pmic->rdev[i])) {
 272                         dev_err(max77693_pmic->dev,
 273                                 "Failed to initialize regulator-%d\n", id);
 274                         return PTR_ERR(max77693_pmic->rdev[i]);
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 static const struct platform_device_id max77693_pmic_id[] = {
 282         {"max77693-pmic", 0},
 283         {},
 284 };
 285
 286 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 287
 288 static struct platform_driver max77693_pmic_driver = {
 289         .driver = {
 290                    .name = "max77693-pmic",
 291                    .owner = THIS_MODULE,
 292                    },
 293         .probe = max77693_pmic_probe,
 294         .id_table = max77693_pmic_id,
 295 };
 296
 297 module_platform_driver(max77693_pmic_driver);
 298
 299 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
 300 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 301 MODULE_LICENSE("GPL");