drivers/regulator/lp873x-regulator.c

   1 /*
   2  * Regulator driver for LP873X PMIC
   3  *
   4  * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether expressed or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License version 2 for more details.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19
  20 #include <linux/mfd/lp873x.h>
  21
  22 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
  23                          _delay, _lr, _cr)                              \
  24         [_id] = {                                                       \
  25                 .desc = {                                               \
  26                         .name                   = _name,                \
  27                         .supply_name            = _of "-in",            \
  28                         .id                     = _id,                  \
  29                         .of_match               = of_match_ptr(_of),    \
  30                         .regulators_node        = of_match_ptr("regulators"),\
  31                         .ops                    = &_ops,                \
  32                         .n_voltages             = _n,                   \
  33                         .type                   = REGULATOR_VOLTAGE,    \
  34                         .owner                  = THIS_MODULE,          \
  35                         .vsel_reg               = _vr,                  \
  36                         .vsel_mask              = _vm,                  \
  37                         .enable_reg             = _er,                  \
  38                         .enable_mask            = _em,                  \
  39                         .ramp_delay             = _delay,               \
  40                         .linear_ranges          = _lr,                  \
  41                         .n_linear_ranges        = ARRAY_SIZE(_lr),      \
  42                 },                                                      \
  43                 .ctrl2_reg = _cr,                                       \
  44         }
  45
  46 struct lp873x_regulator {
  47         struct regulator_desc desc;
  48         unsigned int ctrl2_reg;
  49 };
  50
  51 static const struct lp873x_regulator regulators[];
  52
  53 static const struct regulator_linear_range buck0_buck1_ranges[] = {
  54         REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
  55         REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
  56         REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
  57         REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
  58 };
  59
  60 static const struct regulator_linear_range ldo0_ldo1_ranges[] = {
  61         REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
  62 };
  63
  64 static unsigned int lp873x_buck_ramp_delay[] = {
  65         30000, 15000, 10000, 7500, 3800, 1900, 940, 470
  66 };
  67
  68 /* LP873X BUCK current limit */
  69 static const unsigned int lp873x_buck_uA[] = {
  70         1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
  71 };
  72
  73 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
  74                                       int ramp_delay)
  75 {
  76         int id = rdev_get_id(rdev);
  77         struct lp873x *lp873 = rdev_get_drvdata(rdev);
  78         unsigned int reg;
  79         int ret;
  80
  81         if (ramp_delay <= 470)
  82                 reg = 7;
  83         else if (ramp_delay <= 940)
  84                 reg = 6;
  85         else if (ramp_delay <= 1900)
  86                 reg = 5;
  87         else if (ramp_delay <= 3800)
  88                 reg = 4;
  89         else if (ramp_delay <= 7500)
  90                 reg = 3;
  91         else if (ramp_delay <= 10000)
  92                 reg = 2;
  93         else if (ramp_delay <= 15000)
  94                 reg = 1;
  95         else
  96                 reg = 0;
  97
  98         ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
  99                                  LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
 100                                  reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
 101         if (ret) {
 102                 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
 103                 return ret;
 104         }
 105
 106         rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
 107
 108         return 0;
 109 }
 110
 111 static int lp873x_buck_set_current_limit(struct regulator_dev *rdev,
 112                                          int min_uA, int max_uA)
 113 {
 114         int id = rdev_get_id(rdev);
 115         struct lp873x *lp873 = rdev_get_drvdata(rdev);
 116         int i;
 117
 118         for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) {
 119                 if (lp873x_buck_uA[i] >= min_uA &&
 120                     lp873x_buck_uA[i] <= max_uA)
 121                         return regmap_update_bits(lp873->regmap,
 122                                                   regulators[id].ctrl2_reg,
 123                                                   LP873X_BUCK0_CTRL_2_BUCK0_ILIM,
 124                                                   i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM));
 125         }
 126
 127         return -EINVAL;
 128 }
 129
 130 static int lp873x_buck_get_current_limit(struct regulator_dev *rdev)
 131 {
 132         int id = rdev_get_id(rdev);
 133         struct lp873x *lp873 = rdev_get_drvdata(rdev);
 134         int ret;
 135         unsigned int val;
 136
 137         ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val);
 138         if (ret)
 139                 return ret;
 140
 141         val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >>
 142                __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM);
 143
 144         return (val < ARRAY_SIZE(lp873x_buck_uA)) ?
 145                         lp873x_buck_uA[val] : -EINVAL;
 146 }
 147
 148 /* Operations permitted on BUCK0, BUCK1 */
 149 static struct regulator_ops lp873x_buck01_ops = {
 150         .is_enabled             = regulator_is_enabled_regmap,
 151         .enable                 = regulator_enable_regmap,
 152         .disable                = regulator_disable_regmap,
 153         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 154         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 155         .list_voltage           = regulator_list_voltage_linear_range,
 156         .map_voltage            = regulator_map_voltage_linear_range,
 157         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 158         .set_ramp_delay         = lp873x_buck_set_ramp_delay,
 159         .set_current_limit      = lp873x_buck_set_current_limit,
 160         .get_current_limit      = lp873x_buck_get_current_limit,
 161 };
 162
 163 /* Operations permitted on LDO0 and LDO1 */
 164 static struct regulator_ops lp873x_ldo01_ops = {
 165         .is_enabled             = regulator_is_enabled_regmap,
 166         .enable                 = regulator_enable_regmap,
 167         .disable                = regulator_disable_regmap,
 168         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 169         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 170         .list_voltage           = regulator_list_voltage_linear_range,
 171         .map_voltage            = regulator_map_voltage_linear_range,
 172 };
 173
 174 static const struct lp873x_regulator regulators[] = {
 175         LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
 176                          256, LP873X_REG_BUCK0_VOUT,
 177                          LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
 178                          LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
 179                          buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
 180         LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
 181                          256, LP873X_REG_BUCK1_VOUT,
 182                          LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
 183                          LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
 184                          buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
 185         LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
 186                          LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
 187                          LP873X_REG_LDO0_CTRL,
 188                          LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
 189         LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
 190                          LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
 191                          LP873X_REG_LDO1_CTRL,
 192                          LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
 193 };
 194
 195 static int lp873x_regulator_probe(struct platform_device *pdev)
 196 {
 197         struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
 198         struct regulator_config config = { };
 199         struct regulator_dev *rdev;
 200         int i;
 201
 202         platform_set_drvdata(pdev, lp873);
 203
 204         config.dev = &pdev->dev;
 205         config.dev->of_node = lp873->dev->of_node;
 206         config.driver_data = lp873;
 207         config.regmap = lp873->regmap;
 208
 209         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 210                 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 211                                                &config);
 212                 if (IS_ERR(rdev)) {
 213                         dev_err(lp873->dev, "failed to register %s regulator\n",
 214                                 pdev->name);
 215                         return PTR_ERR(rdev);
 216                 }
 217         }
 218
 219         return 0;
 220 }
 221
 222 static const struct platform_device_id lp873x_regulator_id_table[] = {
 223         { "lp873x-regulator", },
 224         { /* sentinel */ }
 225 };
 226 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
 227
 228 static struct platform_driver lp873x_regulator_driver = {
 229         .driver = {
 230                 .name = "lp873x-pmic",
 231         },
 232         .probe = lp873x_regulator_probe,
 233         .id_table = lp873x_regulator_id_table,
 234 };
 235 module_platform_driver(lp873x_regulator_driver);
 236
 237 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 238 MODULE_DESCRIPTION("LP873X voltage regulator driver");
 239 MODULE_ALIAS("platform:lp873x-pmic");
 240 MODULE_LICENSE("GPL v2");