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                         .id                     = _id,                  \
  28                         .of_match               = of_match_ptr(_of),    \
  29                         .regulators_node        = of_match_ptr("regulators"),\
  30                         .ops                    = &_ops,                \
  31                         .n_voltages             = _n,                   \
  32                         .type                   = REGULATOR_VOLTAGE,    \
  33                         .owner                  = THIS_MODULE,          \
  34                         .vsel_reg               = _vr,                  \
  35                         .vsel_mask              = _vm,                  \
  36                         .enable_reg             = _er,                  \
  37                         .enable_mask            = _em,                  \
  38                         .ramp_delay             = _delay,               \
  39                         .linear_ranges          = _lr,                  \
  40                         .n_linear_ranges        = ARRAY_SIZE(_lr),      \
  41                 },                                                      \
  42                 .ctrl2_reg = _cr,                                       \
  43         }
  44
  45 struct lp873x_regulator {
  46         struct regulator_desc desc;
  47         unsigned int ctrl2_reg;
  48 };
  49
  50 static const struct lp873x_regulator regulators[];
  51
  52 static const struct regulator_linear_range buck0_buck1_ranges[] = {
  53         REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
  54         REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
  55         REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
  56         REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
  57 };
  58
  59 static const struct regulator_linear_range ldo0_ldo1_ranges[] = {
  60         REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
  61 };
  62
  63 static unsigned int lp873x_buck_ramp_delay[] = {
  64         30000, 15000, 10000, 7500, 3800, 1900, 940, 470
  65 };
  66
  67 /* LP873X BUCK current limit */
  68 static const unsigned int lp873x_buck_uA[] = {
  69         1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
  70 };
  71
  72 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
  73                                       int ramp_delay)
  74 {
  75         int id = rdev_get_id(rdev);
  76         struct lp873x *lp873 = rdev_get_drvdata(rdev);
  77         unsigned int reg;
  78         int ret;
  79
  80         if (ramp_delay <= 470)
  81                 reg = 7;
  82         else if (ramp_delay <= 940)
  83                 reg = 6;
  84         else if (ramp_delay <= 1900)
  85                 reg = 5;
  86         else if (ramp_delay <= 3800)
  87                 reg = 4;
  88         else if (ramp_delay <= 7500)
  89                 reg = 3;
  90         else if (ramp_delay <= 10000)
  91                 reg = 2;
  92         else if (ramp_delay <= 15000)
  93                 reg = 1;
  94         else
  95                 reg = 0;
  96
  97         ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
  98                                  LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
  99                                  reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
 100         if (ret) {
 101                 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
 102                 return ret;
 103         }
 104
 105         rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
 106
 107         return 0;
 108 }
 109
 110 static int lp873x_buck_set_current_limit(struct regulator_dev *rdev,
 111                                          int min_uA, int max_uA)
 112 {
 113         int id = rdev_get_id(rdev);
 114         struct lp873x *lp873 = rdev_get_drvdata(rdev);
 115         int i;
 116
 117         for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) {
 118                 if (lp873x_buck_uA[i] >= min_uA &&
 119                     lp873x_buck_uA[i] <= max_uA)
 120                         return regmap_update_bits(lp873->regmap,
 121                                                   regulators[id].ctrl2_reg,
 122                                                   LP873X_BUCK0_CTRL_2_BUCK0_ILIM,
 123                                                   i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM));
 124         }
 125
 126         return -EINVAL;
 127 }
 128
 129 static int lp873x_buck_get_current_limit(struct regulator_dev *rdev)
 130 {
 131         int id = rdev_get_id(rdev);
 132         struct lp873x *lp873 = rdev_get_drvdata(rdev);
 133         int ret;
 134         unsigned int val;
 135
 136         ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val);
 137         if (ret)
 138                 return ret;
 139
 140         val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >>
 141                __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM);
 142
 143         return (val < ARRAY_SIZE(lp873x_buck_uA)) ?
 144                         lp873x_buck_uA[val] : -EINVAL;
 145 }
 146
 147 /* Operations permitted on BUCK0, BUCK1 */
 148 static struct regulator_ops lp873x_buck01_ops = {
 149         .is_enabled             = regulator_is_enabled_regmap,
 150         .enable                 = regulator_enable_regmap,
 151         .disable                = regulator_disable_regmap,
 152         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 153         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 154         .list_voltage           = regulator_list_voltage_linear_range,
 155         .map_voltage            = regulator_map_voltage_linear_range,
 156         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 157         .set_ramp_delay         = lp873x_buck_set_ramp_delay,
 158         .set_current_limit      = lp873x_buck_set_current_limit,
 159         .get_current_limit      = lp873x_buck_get_current_limit,
 160 };
 161
 162 /* Operations permitted on LDO0 and LDO1 */
 163 static struct regulator_ops lp873x_ldo01_ops = {
 164         .is_enabled             = regulator_is_enabled_regmap,
 165         .enable                 = regulator_enable_regmap,
 166         .disable                = regulator_disable_regmap,
 167         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 168         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 169         .list_voltage           = regulator_list_voltage_linear_range,
 170         .map_voltage            = regulator_map_voltage_linear_range,
 171 };
 172
 173 static const struct lp873x_regulator regulators[] = {
 174         LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
 175                          256, LP873X_REG_BUCK0_VOUT,
 176                          LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
 177                          LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
 178                          buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
 179         LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
 180                          256, LP873X_REG_BUCK1_VOUT,
 181                          LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
 182                          LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
 183                          buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
 184         LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
 185                          LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
 186                          LP873X_REG_LDO0_CTRL,
 187                          LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
 188         LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
 189                          LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
 190                          LP873X_REG_LDO1_CTRL,
 191                          LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
 192 };
 193
 194 static int lp873x_regulator_probe(struct platform_device *pdev)
 195 {
 196         struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
 197         struct regulator_config config = { };
 198         struct regulator_dev *rdev;
 199         int i;
 200
 201         platform_set_drvdata(pdev, lp873);
 202
 203         config.dev = &pdev->dev;
 204         config.dev->of_node = lp873->dev->of_node;
 205         config.driver_data = lp873;
 206         config.regmap = lp873->regmap;
 207
 208         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 209                 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
 210                                                &config);
 211                 if (IS_ERR(rdev)) {
 212                         dev_err(lp873->dev, "failed to register %s regulator\n",
 213                                 pdev->name);
 214                         return PTR_ERR(rdev);
 215                 }
 216         }
 217
 218         return 0;
 219 }
 220
 221 static const struct platform_device_id lp873x_regulator_id_table[] = {
 222         { "lp873x-regulator", },
 223         { /* sentinel */ }
 224 };
 225 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
 226
 227 static struct platform_driver lp873x_regulator_driver = {
 228         .driver = {
 229                 .name = "lp873x-pmic",
 230         },
 231         .probe = lp873x_regulator_probe,
 232         .id_table = lp873x_regulator_id_table,
 233 };
 234 module_platform_driver(lp873x_regulator_driver);
 235
 236 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 237 MODULE_DESCRIPTION("LP873X voltage regulator driver");
 238 MODULE_ALIAS("platform:lp873x-pmic");
 239 MODULE_LICENSE("GPL v2");