drivers/regulator/max77693-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // max77693.c - Regulator driver for the Maxim 77693 and 77843
   4 //
   5 // Copyright (C) 2013-2015 Samsung Electronics
   6 // Jonghwa Lee <jonghwa3.lee@samsung.com>
   7 // Krzysztof Kozlowski <krzk@kernel.org>
   8 //
   9 // This driver is based on max77686.c
  10
  11 #include <linux/err.h>
  12 #include <linux/slab.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/module.h>
  15 #include <linux/export.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/mfd/max77693.h>
  19 #include <linux/mfd/max77693-common.h>
  20 #include <linux/mfd/max77693-private.h>
  21 #include <linux/mfd/max77843-private.h>
  22 #include <linux/regulator/of_regulator.h>
  23 #include <linux/regmap.h>
  24
  25 /*
  26  * ID for MAX77843 regulators.
  27  * There is no need for such for MAX77693.
  28  */
  29 enum max77843_regulator_type {
  30         MAX77843_SAFEOUT1 = 0,
  31         MAX77843_SAFEOUT2,
  32         MAX77843_CHARGER,
  33
  34         MAX77843_NUM,
  35 };
  36
  37 /* Register differences between chargers: MAX77693 and MAX77843 */
  38 struct chg_reg_data {
  39         unsigned int linear_reg;
  40         unsigned int linear_mask;
  41         unsigned int uA_step;
  42         unsigned int min_sel;
  43 };
  44
  45 /*
  46  * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
  47  * 0x00, 0x01, 0x2, 0x03        = 60 mA
  48  * 0x04 ~ 0x7E                  = (60 + (X - 3) * 20) mA
  49  * Actually for MAX77693 the driver manipulates the maximum input current,
  50  * not the fast charge current (output). This should be fixed.
  51  *
  52  * On MAX77843 the calculation formula is the same (except values).
  53  * Fortunately it properly manipulates the fast charge current.
  54  */
  55 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
  56 {
  57         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
  58         unsigned int chg_min_uA = rdev->constraints->min_uA;
  59         unsigned int chg_max_uA = rdev->constraints->max_uA;
  60         unsigned int reg, sel;
  61         unsigned int val;
  62         int ret;
  63
  64         ret = regmap_read(rdev->regmap, reg_data->linear_reg, &reg);
  65         if (ret < 0)
  66                 return ret;
  67
  68         sel = reg & reg_data->linear_mask;
  69
  70         /* the first four codes for charger current are all 60mA */
  71         if (sel <= reg_data->min_sel)
  72                 sel = 0;
  73         else
  74                 sel -= reg_data->min_sel;
  75
  76         val = chg_min_uA + reg_data->uA_step * sel;
  77         if (val > chg_max_uA)
  78                 return -EINVAL;
  79
  80         return val;
  81 }
  82
  83 static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
  84                                                 int min_uA, int max_uA)
  85 {
  86         const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
  87         unsigned int chg_min_uA = rdev->constraints->min_uA;
  88         int sel = 0;
  89
  90         while (chg_min_uA + reg_data->uA_step * sel < min_uA)
  91                 sel++;
  92
  93         if (chg_min_uA + reg_data->uA_step * sel > max_uA)
  94                 return -EINVAL;
  95
  96         /* the first four codes for charger current are all 60mA */
  97         sel += reg_data->min_sel;
  98
  99         return regmap_write(rdev->regmap, reg_data->linear_reg, sel);
 100 }
 101 /* end of CHARGER regulator ops */
 102
 103 /* Returns regmap suitable for given regulator on chosen device */
 104 static struct regmap *max77693_get_regmap(enum max77693_types type,
 105                                           struct max77693_dev *max77693,
 106                                           int reg_id)
 107 {
 108         if (type == TYPE_MAX77693)
 109                 return max77693->regmap;
 110
 111         /* Else: TYPE_MAX77843 */
 112         switch (reg_id) {
 113         case MAX77843_SAFEOUT1:
 114         case MAX77843_SAFEOUT2:
 115                 return max77693->regmap;
 116         case MAX77843_CHARGER:
 117                 return max77693->regmap_chg;
 118         default:
 119                 return max77693->regmap;
 120         }
 121 }
 122
 123 static const unsigned int max77693_safeout_table[] = {
 124         4850000,
 125         4900000,
 126         4950000,
 127         3300000,
 128 };
 129
 130 static const struct regulator_ops max77693_safeout_ops = {
 131         .list_voltage           = regulator_list_voltage_table,
 132         .is_enabled             = regulator_is_enabled_regmap,
 133         .enable                 = regulator_enable_regmap,
 134         .disable                = regulator_disable_regmap,
 135         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 136         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 137 };
 138
 139 static const struct regulator_ops max77693_charger_ops = {
 140         .is_enabled             = regulator_is_enabled_regmap,
 141         .enable                 = regulator_enable_regmap,
 142         .disable                = regulator_disable_regmap,
 143         .get_current_limit      = max77693_chg_get_current_limit,
 144         .set_current_limit      = max77693_chg_set_current_limit,
 145 };
 146
 147 #define max77693_regulator_desc_esafeout(_num)  {               \
 148         .name           = "ESAFEOUT"#_num,                      \
 149         .id             = MAX77693_ESAFEOUT##_num,              \
 150         .of_match       = of_match_ptr("ESAFEOUT"#_num),        \
 151         .regulators_node        = of_match_ptr("regulators"),   \
 152         .n_voltages     = 4,                                    \
 153         .ops            = &max77693_safeout_ops,                \
 154         .type           = REGULATOR_VOLTAGE,                    \
 155         .owner          = THIS_MODULE,                          \
 156         .volt_table     = max77693_safeout_table,               \
 157         .vsel_reg       = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 158         .vsel_mask      = SAFEOUT_CTRL_SAFEOUT##_num##_MASK,    \
 159         .enable_reg     = MAX77693_CHG_REG_SAFEOUT_CTRL,        \
 160         .enable_mask    = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
 161 }
 162
 163 static const struct regulator_desc max77693_supported_regulators[] = {
 164         max77693_regulator_desc_esafeout(1),
 165         max77693_regulator_desc_esafeout(2),
 166         {
 167                 .name = "CHARGER",
 168                 .id = MAX77693_CHARGER,
 169                 .of_match = of_match_ptr("CHARGER"),
 170                 .regulators_node = of_match_ptr("regulators"),
 171                 .ops = &max77693_charger_ops,
 172                 .type = REGULATOR_CURRENT,
 173                 .owner = THIS_MODULE,
 174                 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
 175                 .enable_mask = CHG_CNFG_00_CHG_MASK |
 176                                 CHG_CNFG_00_BUCK_MASK,
 177                 .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
 178         },
 179 };
 180
 181 static const struct chg_reg_data max77693_chg_reg_data = {
 182         .linear_reg     = MAX77693_CHG_REG_CHG_CNFG_09,
 183         .linear_mask    = CHG_CNFG_09_CHGIN_ILIM_MASK,
 184         .uA_step        = 20000,
 185         .min_sel        = 3,
 186 };
 187
 188 #define max77843_regulator_desc_esafeout(num)   {                       \
 189         .name           = "SAFEOUT" # num,                              \
 190         .id             = MAX77843_SAFEOUT ## num,                      \
 191         .ops            = &max77693_safeout_ops,                        \
 192         .of_match       = of_match_ptr("SAFEOUT" # num),                \
 193         .regulators_node = of_match_ptr("regulators"),                  \
 194         .type           = REGULATOR_VOLTAGE,                            \
 195         .owner          = THIS_MODULE,                                  \
 196         .n_voltages     = ARRAY_SIZE(max77693_safeout_table),           \
 197         .volt_table     = max77693_safeout_table,                       \
 198         .enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,                 \
 199         .enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num,    \
 200         .vsel_reg       = MAX77843_SYS_REG_SAFEOUTCTRL,                 \
 201         .vsel_mask      = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
 202 }
 203
 204 static const struct regulator_desc max77843_supported_regulators[] = {
 205         [MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),
 206         [MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),
 207         [MAX77843_CHARGER] = {
 208                 .name           = "CHARGER",
 209                 .id             = MAX77843_CHARGER,
 210                 .ops            = &max77693_charger_ops,
 211                 .of_match       = of_match_ptr("CHARGER"),
 212                 .regulators_node = of_match_ptr("regulators"),
 213                 .type           = REGULATOR_CURRENT,
 214                 .owner          = THIS_MODULE,
 215                 .enable_reg     = MAX77843_CHG_REG_CHG_CNFG_00,
 216                 .enable_mask    = MAX77843_CHG_MASK,
 217                 .enable_val     = MAX77843_CHG_MASK,
 218         },
 219 };
 220
 221 static const struct chg_reg_data max77843_chg_reg_data = {
 222         .linear_reg     = MAX77843_CHG_REG_CHG_CNFG_02,
 223         .linear_mask    = MAX77843_CHG_FAST_CHG_CURRENT_MASK,
 224         .uA_step        = MAX77843_CHG_FAST_CHG_CURRENT_STEP,
 225         .min_sel        = 2,
 226 };
 227
 228 static int max77693_pmic_probe(struct platform_device *pdev)
 229 {
 230         enum max77693_types type = platform_get_device_id(pdev)->driver_data;
 231         struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 232         const struct regulator_desc *regulators;
 233         unsigned int regulators_size;
 234         int i;
 235         struct regulator_config config = { };
 236
 237         config.dev = iodev->dev;
 238
 239         switch (type) {
 240         case TYPE_MAX77693:
 241                 regulators = max77693_supported_regulators;
 242                 regulators_size = ARRAY_SIZE(max77693_supported_regulators);
 243                 config.driver_data = (void *)&max77693_chg_reg_data;
 244                 break;
 245         case TYPE_MAX77843:
 246                 regulators = max77843_supported_regulators;
 247                 regulators_size = ARRAY_SIZE(max77843_supported_regulators);
 248                 config.driver_data = (void *)&max77843_chg_reg_data;
 249                 break;
 250         default:
 251                 dev_err(&pdev->dev, "Unsupported device type: %u\n", type);
 252                 return -ENODEV;
 253         }
 254
 255         for (i = 0; i < regulators_size; i++) {
 256                 struct regulator_dev *rdev;
 257
 258                 config.regmap = max77693_get_regmap(type, iodev,
 259                                                     regulators[i].id);
 260
 261                 rdev = devm_regulator_register(&pdev->dev,
 262                                                 &regulators[i], &config);
 263                 if (IS_ERR(rdev)) {
 264                         dev_err(&pdev->dev,
 265                                 "Failed to initialize regulator-%d\n", i);
 266                         return PTR_ERR(rdev);
 267                 }
 268         }
 269
 270         return 0;
 271 }
 272
 273 static const struct platform_device_id max77693_pmic_id[] = {
 274         { "max77693-pmic", TYPE_MAX77693 },
 275         { "max77843-regulator", TYPE_MAX77843 },
 276         {},
 277 };
 278
 279 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
 280
 281 static struct platform_driver max77693_pmic_driver = {
 282         .driver = {
 283                    .name = "max77693-pmic",
 284                    .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 285                    },
 286         .probe = max77693_pmic_probe,
 287         .id_table = max77693_pmic_id,
 288 };
 289
 290 static int __init max77693_pmic_init(void)
 291 {
 292         return platform_driver_register(&max77693_pmic_driver);
 293 }
 294 subsys_initcall(max77693_pmic_init);
 295
 296 static void __exit max77693_pmic_cleanup(void)
 297 {
 298         platform_driver_unregister(&max77693_pmic_driver);
 299 }
 300 module_exit(max77693_pmic_cleanup);
 301
 302 MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
 303 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
 304 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
 305 MODULE_LICENSE("GPL");