kernel/drivers/regulator/max77693.c

   1 /*
   2  * max77693.c - Regulator driver for the Maxim 77693 and 77843
   3  *
   4  * Copyright (C) 2013-2015 Samsung Electronics
   5  * Jonghwa Lee <jonghwa3.lee@samsung.com>
   6  * Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  * This driver is based on max77686.c
  23  */
  24
  25 #include <linux/err.h>
  26 #include <linux/slab.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/module.h>
  29 #include <linux/export.h>
  30 #include <linux/regulator/driver.h>
  31 #include <linux/regulator/machine.h>
  32 #include <linux/mfd/max77693.h>
  33 #include <linux/mfd/max77693-common.h>
  34 #include <linux/mfd/max77693-private.h>
  35 #include <linux/mfd/max77843-private.h>
  36 #include <linux/regulator/of_regulator.h>
  37 #include <linux/regmap.h>
  38
  39 /*
  40  * ID for MAX77843 regulators.
  41  * There is no need for such for MAX77693.
  42  */
  43 enum max77843_regulator_type {
  44         MAX77843_SAFEOUT1 = 0,
  45         MAX77843_SAFEOUT2,
  46         MAX77843_CHARGER,
  47
  48         MAX77843_NUM,
  49 };
  50
  51 /* Register differences between chargers: MAX77693 and MAX77843 */
  52 struct chg_reg_data {
  53         unsigned int linear_reg;
  54         unsigned int linear_mask;
  55         unsigned int uA_step;
  56         unsigned int min_sel;
  57 };
  58
  59 /*
  60  * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  61  * 0x00, 0x01, 0x2, 0x03        = 60 mA
  62  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
  63  * Actually for MAX77693 the driver manipulates the maximum input current,
  64  * not the fast charge current (output). This should be fixed.
  65  *
  66  * On MAX77843 the calculation formula is the same (except values).
  67  * Fortunately it properly manipulates the fast charge current.
  68  */
  69 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
  70 {
  71         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
  72         unsigned int chg_min_uA = rdev->constraints->min_uA;
  73         unsigned int chg_max_uA = rdev->constraints->max_uA;
  74         unsigned int reg, sel;
  75         unsigned int val;
  76         int ret;
  77
  78         ret = regmap_read(rdev->regmap, reg_data->linear_reg, &reg);
  79         if (ret < 0)
  80                 return ret;
  81
  82         sel = reg & reg_data->linear_mask;
  83
  84         /* the first four codes for charger current are all 60mA */
  85         if (sel <= reg_data->min_sel)
  86                 sel = 0;
  87         else
  88                 sel -= reg_data->min_sel;
  89
  90         val = chg_min_uA + reg_data->uA_step * sel;
  91         if (val > chg_max_uA)
  92                 return -EINVAL;
  93
  94         return val;
  95 }
  96
  97 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
  98                                                 int min_uA, int max_uA)
  99 {
 100         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
 101         unsigned int chg_min_uA = rdev->constraints->min_uA;
 102         int sel = 0;
 103
 104         while (chg_min_uA + reg_data->uA_step * sel < min_uA)
 105                 sel++;
 106
 107         if (chg_min_uA + reg_data->uA_step * sel > max_uA)
 108                 return -EINVAL;
 109
 110         /* the first four codes for charger current are all 60mA */
 111         sel += reg_data->min_sel;
 112
 113         return regmap_write(rdev->regmap, reg_data->linear_reg, sel);
 114 }
 115 /* end of CHARGER regulator ops */
 116
 117 /* Returns regmap suitable for given regulator on chosen device */
 118 static struct regmap *max77693_get_regmap(enum max77693_types type,
 119                                           struct max77693_dev *max77693,
 120                                           int reg_id)
 121 {
 122         if (type == TYPE_MAX77693)
 123                 return max77693->regmap;
 124
 125         /* Else: TYPE_MAX77843 */
 126         switch (reg_id) {
 127         case MAX77843_SAFEOUT1:
 128         case MAX77843_SAFEOUT2:
 129                 return max77693->regmap;
 130         case MAX77843_CHARGER:
 131                 return max77693->regmap_chg;
 132         default:
 133                 return max77693->regmap;
 134         }
 135 }
 136
 137 static const unsigned int max77693_safeout_table[] = {
 138         4850000,
 139         4900000,
 140         4950000,
 141         3300000,
 142 };
 143
 144 static struct regulator_ops max77693_safeout_ops = {
 145         .list_voltage           = regulator_list_voltage_table,
 146         .is_enabled             = regulator_is_enabled_regmap,
 147         .enable                 = regulator_enable_regmap,
 148         .disable                = regulator_disable_regmap,
 149         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 150         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 151 };
 152
 153 static struct regulator_ops max77693_charger_ops = {
 154         .is_enabled             = regulator_is_enabled_regmap,
 155         .enable                 = regulator_enable_regmap,
 156         .disable                = regulator_disable_regmap,
 157         .get_current_limit      = max77693_chg_get_current_limit,
 158         .set_current_limit      = max77693_chg_set_current_limit,
 159 };
 160
 161 #define max77693_regulator_desc_esafeout(_num)  {               \
 162         .name           = "ESAFEOUT"#_num,                      \
 163         .id             = MAX77693_ESAFEOUT##_num,              \
 164         .of_match       = of_match_ptr("ESAFEOUT"#_num),        \
 165         .regulators_node        = of_match_ptr("regulators"),   \
 166         .n_voltages     = 4,                                    \
 167         .ops            = &max77693_safeout_ops,                \
 168         .type           = REGULATOR_VOLTAGE,                    \
 169         .owner          = THIS_MODULE,                          \
 170         .volt_table     = max77693_safeout_table,               \
 171         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 172         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
 173         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 174         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
 175 }
 176
 177 static const struct regulator_desc max77693_supported_regulators[] = {
 178         max77693_regulator_desc_esafeout(1),
 179         max77693_regulator_desc_esafeout(2),
 180         {
 181                 .name = "CHARGER",
 182                 .id = MAX77693_CHARGER,
 183                 .of_match = of_match_ptr("CHARGER"),
 184                 .regulators_node = of_match_ptr("regulators"),
 185                 .ops = &max77693_charger_ops,
 186                 .type = REGULATOR_CURRENT,
 187                 .owner = THIS_MODULE,
 188                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 189                 .enable_mask = CHG_CNFG_00_CHG_MASK |
 190                                 CHG_CNFG_00_BUCK_MASK,
 191                 .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
 192         },
 193 };
 194
 195 static const struct chg_reg_data max77693_chg_reg_data = {
 196         .linear_reg     = MAX77693_CHG_REG_CHG_CNFG_09,
 197         .linear_mask    = CHG_CNFG_09_CHGIN_ILIM_MASK,
 198         .uA_step        = 20000,
 199         .min_sel        = 3,
 200 };
 201
 202 #define max77843_regulator_desc_esafeout(num)   {                       \
 203         .name           = "SAFEOUT" # num,                              \
 204         .id             = MAX77843_SAFEOUT ## num,                      \
 205         .ops            = &max77693_safeout_ops,                        \
 206         .of_match       = of_match_ptr("SAFEOUT" # num),                \
 207         .regulators_node = of_match_ptr("regulators"),                  \
 208         .type           = REGULATOR_VOLTAGE,                            \
 209         .owner          = THIS_MODULE,                                  \
 210         .n_voltages     = ARRAY_SIZE(max77693_safeout_table),           \
 211         .volt_table     = max77693_safeout_table,                       \
 212         .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,                 \
 213         .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num,    \
 214         .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL,                 \
 215         .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
 216 }
 217
 218 static const struct regulator_desc max77843_supported_regulators[] = {
 219         [MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),
 220         [MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),
 221         [MAX77843_CHARGER] = {
 222                 .name           = "CHARGER",
 223                 .id             = MAX77843_CHARGER,
 224                 .ops            = &max77693_charger_ops,
 225                 .of_match       = of_match_ptr("CHARGER"),
 226                 .regulators_node = of_match_ptr("regulators"),
 227                 .type           = REGULATOR_CURRENT,
 228                 .owner          = THIS_MODULE,
 229                 .enable_reg     = MAX77843_CHG_REG_CHG_CNFG_00,
 230                 .enable_mask    = MAX77843_CHG_MASK,
 231                 .enable_val     = MAX77843_CHG_MASK,
 232         },
 233 };
 234
 235 static const struct chg_reg_data max77843_chg_reg_data = {
 236         .linear_reg     = MAX77843_CHG_REG_CHG_CNFG_02,
 237         .linear_mask    = MAX77843_CHG_FAST_CHG_CURRENT_MASK,
 238         .uA_step        = MAX77843_CHG_FAST_CHG_CURRENT_STEP,
 239         .min_sel        = 2,
 240 };
 241
 242 static int max77693_pmic_probe(struct platform_device *pdev)
 243 {
 244         enum max77693_types type = platform_get_device_id(pdev)->driver_data;
 245         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 246         const struct regulator_desc *regulators;
 247         unsigned int regulators_size;
 248         int i;
 249         struct regulator_config config = { };
 250
 251         config.dev = iodev->dev;
 252
 253         switch (type) {
 254         case TYPE_MAX77693:
 255                 regulators = max77693_supported_regulators;
 256                 regulators_size = ARRAY_SIZE(max77693_supported_regulators);
 257                 config.driver_data = (void *)&max77693_chg_reg_data;
 258                 break;
 259         case TYPE_MAX77843:
 260                 regulators = max77843_supported_regulators;
 261                 regulators_size = ARRAY_SIZE(max77843_supported_regulators);
 262                 config.driver_data = (void *)&max77843_chg_reg_data;
 263                 break;
 264         default:
 265                 dev_err(&pdev->dev, "Unsupported device type: %u\n", type);
 266                 return -ENODEV;
 267         }
 268
 269         for (i = 0; i < regulators_size; i++) {
 270                 struct regulator_dev *rdev;
 271
 272                 config.regmap = max77693_get_regmap(type, iodev,
 273                                                     regulators[i].id);
 274
 275                 rdev = devm_regulator_register(&pdev->dev,
 276                                                 &regulators[i], &config);
 277                 if (IS_ERR(rdev)) {
 278                         dev_err(&pdev->dev,
 279                                 "Failed to initialize regulator-%d\n", i);
 280                         return PTR_ERR(rdev);
 281                 }
 282         }
 283
 284         return 0;
 285 }
 286
 287 static const struct platform_device_id max77693_pmic_id[] = {
 288         { "max77693-pmic", TYPE_MAX77693 },
 289         { "max77843-regulator", TYPE_MAX77843 },
 290         {},
 291 };
 292
 293 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 294
 295 static struct platform_driver max77693_pmic_driver = {
 296         .driver = {
 297                    .name = "max77693-pmic",
 298                    },
 299         .probe = max77693_pmic_probe,
 300         .id_table = max77693_pmic_id,
 301 };
 302
 303 static int __init max77693_pmic_init(void)
 304 {
 305         return platform_driver_register(&max77693_pmic_driver);
 306 }
 307 subsys_initcall(max77693_pmic_init);
 308
 309 static void __exit max77693_pmic_cleanup(void)
 310 {
 311         platform_driver_unregister(&max77693_pmic_driver);
 312 }
 313 module_exit(max77693_pmic_cleanup);
 314
 315 MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
 316 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 317 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski.k@gmail.com>");
 318 MODULE_LICENSE("GPL");