drivers/regulator/axp20x-regulator.c

   1 /*
   2  * AXP20x regulators driver.
   3  *
   4  * Copyright (C) 2013 Carlo Caione <carlo@caione.org>
   5  *
   6  * This file is subject to the terms and conditions of the GNU General
   7  * Public License. See the file "COPYING" in the main directory of this
   8  * archive for more details.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/err.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/mfd/axp20x.h>
  24 #include <linux/regulator/driver.h>
  25 #include <linux/regulator/of_regulator.h>
  26
  27 #define AXP20X_IO_ENABLED               0x03
  28 #define AXP20X_IO_DISABLED              0x07
  29
  30 #define AXP20X_WORKMODE_DCDC2_MASK      BIT(2)
  31 #define AXP20X_WORKMODE_DCDC3_MASK      BIT(1)
  32
  33 #define AXP20X_FREQ_DCDC_MASK           0x0f
  34
  35 #define AXP_DESC_IO(_family, _id, _match, _supply, _min, _max, _step, _vreg,    \
  36                     _vmask, _ereg, _emask, _enable_val, _disable_val)           \
  37         [_family##_##_id] = {                                                   \
  38                 .name           = #_id,                                         \
  39                 .supply_name    = (_supply),                                    \
  40                 .of_match       = of_match_ptr(_match),                         \
  41                 .regulators_node = of_match_ptr("regulators"),                  \
  42                 .type           = REGULATOR_VOLTAGE,                            \
  43                 .id             = _family##_##_id,                              \
  44                 .n_voltages     = (((_max) - (_min)) / (_step) + 1),            \
  45                 .owner          = THIS_MODULE,                                  \
  46                 .min_uV         = (_min) * 1000,                                \
  47                 .uV_step        = (_step) * 1000,                               \
  48                 .vsel_reg       = (_vreg),                                      \
  49                 .vsel_mask      = (_vmask),                                     \
  50                 .enable_reg     = (_ereg),                                      \
  51                 .enable_mask    = (_emask),                                     \
  52                 .enable_val     = (_enable_val),                                \
  53                 .disable_val    = (_disable_val),                               \
  54                 .ops            = &axp20x_ops,                                  \
  55         }
  56
  57 #define AXP_DESC(_family, _id, _match, _supply, _min, _max, _step, _vreg,       \
  58                  _vmask, _ereg, _emask)                                         \
  59         [_family##_##_id] = {                                                   \
  60                 .name           = #_id,                                         \
  61                 .supply_name    = (_supply),                                    \
  62                 .of_match       = of_match_ptr(_match),                         \
  63                 .regulators_node = of_match_ptr("regulators"),                  \
  64                 .type           = REGULATOR_VOLTAGE,                            \
  65                 .id             = _family##_##_id,                              \
  66                 .n_voltages     = (((_max) - (_min)) / (_step) + 1),            \
  67                 .owner          = THIS_MODULE,                                  \
  68                 .min_uV         = (_min) * 1000,                                \
  69                 .uV_step        = (_step) * 1000,                               \
  70                 .vsel_reg       = (_vreg),                                      \
  71                 .vsel_mask      = (_vmask),                                     \
  72                 .enable_reg     = (_ereg),                                      \
  73                 .enable_mask    = (_emask),                                     \
  74                 .ops            = &axp20x_ops,                                  \
  75         }
  76
  77 #define AXP_DESC_FIXED(_family, _id, _match, _supply, _volt)                    \
  78         [_family##_##_id] = {                                                   \
  79                 .name           = #_id,                                         \
  80                 .supply_name    = (_supply),                                    \
  81                 .of_match       = of_match_ptr(_match),                         \
  82                 .regulators_node = of_match_ptr("regulators"),                  \
  83                 .type           = REGULATOR_VOLTAGE,                            \
  84                 .id             = _family##_##_id,                              \
  85                 .n_voltages     = 1,                                            \
  86                 .owner          = THIS_MODULE,                                  \
  87                 .min_uV         = (_volt) * 1000,                               \
  88                 .ops            = &axp20x_ops_fixed                             \
  89         }
  90
  91 #define AXP_DESC_TABLE(_family, _id, _match, _supply, _table, _vreg, _vmask,    \
  92                        _ereg, _emask)                                           \
  93         [_family##_##_id] = {                                                   \
  94                 .name           = #_id,                                         \
  95                 .supply_name    = (_supply),                                    \
  96                 .of_match       = of_match_ptr(_match),                         \
  97                 .regulators_node = of_match_ptr("regulators"),                  \
  98                 .type           = REGULATOR_VOLTAGE,                            \
  99                 .id             = _family##_##_id,                              \
 100                 .n_voltages     = ARRAY_SIZE(_table),                           \
 101                 .owner          = THIS_MODULE,                                  \
 102                 .vsel_reg       = (_vreg),                                      \
 103                 .vsel_mask      = (_vmask),                                     \
 104                 .enable_reg     = (_ereg),                                      \
 105                 .enable_mask    = (_emask),                                     \
 106                 .volt_table     = (_table),                                     \
 107                 .ops            = &axp20x_ops_table,                            \
 108         }
 109
 110 static const int axp20x_ldo4_data[] = { 1250000, 1300000, 1400000, 1500000, 1600000,
 111                                         1700000, 1800000, 1900000, 2000000, 2500000,
 112                                         2700000, 2800000, 3000000, 3100000, 3200000,
 113                                         3300000 };
 114
 115 static struct regulator_ops axp20x_ops_fixed = {
 116         .list_voltage           = regulator_list_voltage_linear,
 117 };
 118
 119 static struct regulator_ops axp20x_ops_table = {
 120         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 121         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 122         .list_voltage           = regulator_list_voltage_table,
 123         .map_voltage            = regulator_map_voltage_ascend,
 124         .enable                 = regulator_enable_regmap,
 125         .disable                = regulator_disable_regmap,
 126         .is_enabled             = regulator_is_enabled_regmap,
 127 };
 128
 129 static struct regulator_ops axp20x_ops = {
 130         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 131         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 132         .list_voltage           = regulator_list_voltage_linear,
 133         .enable                 = regulator_enable_regmap,
 134         .disable                = regulator_disable_regmap,
 135         .is_enabled             = regulator_is_enabled_regmap,
 136 };
 137
 138 static const struct regulator_desc axp20x_regulators[] = {
 139         AXP_DESC(AXP20X, DCDC2, "dcdc2", "vin2", 700, 2275, 25,
 140                  AXP20X_DCDC2_V_OUT, 0x3f, AXP20X_PWR_OUT_CTRL, 0x10),
 141         AXP_DESC(AXP20X, DCDC3, "dcdc3", "vin3", 700, 3500, 25,
 142                  AXP20X_DCDC3_V_OUT, 0x7f, AXP20X_PWR_OUT_CTRL, 0x02),
 143         AXP_DESC_FIXED(AXP20X, LDO1, "ldo1", "acin", 1300),
 144         AXP_DESC(AXP20X, LDO2, "ldo2", "ldo24in", 1800, 3300, 100,
 145                  AXP20X_LDO24_V_OUT, 0xf0, AXP20X_PWR_OUT_CTRL, 0x04),
 146         AXP_DESC(AXP20X, LDO3, "ldo3", "ldo3in", 700, 3500, 25,
 147                  AXP20X_LDO3_V_OUT, 0x7f, AXP20X_PWR_OUT_CTRL, 0x40),
 148         AXP_DESC_TABLE(AXP20X, LDO4, "ldo4", "ldo24in", axp20x_ldo4_data,
 149                        AXP20X_LDO24_V_OUT, 0x0f, AXP20X_PWR_OUT_CTRL, 0x08),
 150         AXP_DESC_IO(AXP20X, LDO5, "ldo5", "ldo5in", 1800, 3300, 100,
 151                     AXP20X_LDO5_V_OUT, 0xf0, AXP20X_GPIO0_CTRL, 0x07,
 152                     AXP20X_IO_ENABLED, AXP20X_IO_DISABLED),
 153 };
 154
 155 static int axp20x_set_dcdc_freq(struct platform_device *pdev, u32 dcdcfreq)
 156 {
 157         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 158         u32 min, max, def, step;
 159
 160         switch (axp20x->variant) {
 161         case AXP202_ID:
 162         case AXP209_ID:
 163                 min = 750;
 164                 max = 1875;
 165                 def = 1500;
 166                 step = 75;
 167                 break;
 168         default:
 169                 dev_err(&pdev->dev,
 170                         "Setting DCDC frequency for unsupported AXP variant\n");
 171                 return -EINVAL;
 172         }
 173
 174         if (dcdcfreq == 0)
 175                 dcdcfreq = def;
 176
 177         if (dcdcfreq < min) {
 178                 dcdcfreq = min;
 179                 dev_warn(&pdev->dev, "DCDC frequency too low. Set to %ukHz\n",
 180                          min);
 181         }
 182
 183         if (dcdcfreq > max) {
 184                 dcdcfreq = max;
 185                 dev_warn(&pdev->dev, "DCDC frequency too high. Set to %ukHz\n",
 186                          max);
 187         }
 188
 189         dcdcfreq = (dcdcfreq - min) / step;
 190
 191         return regmap_update_bits(axp20x->regmap, AXP20X_DCDC_FREQ,
 192                                   AXP20X_FREQ_DCDC_MASK, dcdcfreq);
 193 }
 194
 195 static int axp20x_regulator_parse_dt(struct platform_device *pdev)
 196 {
 197         struct device_node *np, *regulators;
 198         int ret;
 199         u32 dcdcfreq = 0;
 200
 201         np = of_node_get(pdev->dev.parent->of_node);
 202         if (!np)
 203                 return 0;
 204
 205         regulators = of_get_child_by_name(np, "regulators");
 206         if (!regulators) {
 207                 dev_warn(&pdev->dev, "regulators node not found\n");
 208         } else {
 209                 of_property_read_u32(regulators, "x-powers,dcdc-freq", &dcdcfreq);
 210                 ret = axp20x_set_dcdc_freq(pdev, dcdcfreq);
 211                 if (ret < 0) {
 212                         dev_err(&pdev->dev, "Error setting dcdc frequency: %d\n", ret);
 213                         return ret;
 214                 }
 215
 216                 of_node_put(regulators);
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int axp20x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 workmode)
 223 {
 224         struct axp20x_dev *axp20x = rdev_get_drvdata(rdev);
 225         unsigned int mask;
 226
 227         switch (axp20x->variant) {
 228         case AXP202_ID:
 229         case AXP209_ID:
 230                 if ((id != AXP20X_DCDC2) && (id != AXP20X_DCDC3))
 231                         return -EINVAL;
 232
 233                 mask = AXP20X_WORKMODE_DCDC2_MASK;
 234                 if (id == AXP20X_DCDC3)
 235                         mask = AXP20X_WORKMODE_DCDC3_MASK;
 236
 237                 workmode <<= ffs(mask) - 1;
 238                 break;
 239
 240         default:
 241                 /* should not happen */
 242                 WARN_ON(1);
 243                 return -EINVAL;
 244         }
 245
 246         return regmap_update_bits(rdev->regmap, AXP20X_DCDC_MODE, mask, workmode);
 247 }
 248
 249 static int axp20x_regulator_probe(struct platform_device *pdev)
 250 {
 251         struct regulator_dev *rdev;
 252         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 253         const struct regulator_desc *regulators;
 254         struct regulator_config config = {
 255                 .dev = pdev->dev.parent,
 256                 .regmap = axp20x->regmap,
 257                 .driver_data = axp20x,
 258         };
 259         int ret, i, nregulators;
 260         u32 workmode;
 261
 262         switch (axp20x->variant) {
 263         case AXP202_ID:
 264         case AXP209_ID:
 265                 regulators = axp20x_regulators;
 266                 nregulators = AXP20X_REG_ID_MAX;
 267                 break;
 268         default:
 269                 dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
 270                         axp20x->variant);
 271                 return -EINVAL;
 272         }
 273
 274         /* This only sets the dcdc freq. Ignore any errors */
 275         axp20x_regulator_parse_dt(pdev);
 276
 277         for (i = 0; i < nregulators; i++) {
 278                 rdev = devm_regulator_register(&pdev->dev, &regulators[i],
 279                                                &config);
 280                 if (IS_ERR(rdev)) {
 281                         dev_err(&pdev->dev, "Failed to register %s\n",
 282                                 regulators[i].name);
 283
 284                         return PTR_ERR(rdev);
 285                 }
 286
 287                 ret = of_property_read_u32(rdev->dev.of_node,
 288                                            "x-powers,dcdc-workmode",
 289                                            &workmode);
 290                 if (!ret) {
 291                         if (axp20x_set_dcdc_workmode(rdev, i, workmode))
 292                                 dev_err(&pdev->dev, "Failed to set workmode on %s\n",
 293                                         rdev->desc->name);
 294                 }
 295         }
 296
 297         return 0;
 298 }
 299
 300 static struct platform_driver axp20x_regulator_driver = {
 301         .probe  = axp20x_regulator_probe,
 302         .driver = {
 303                 .name           = "axp20x-regulator",
 304         },
 305 };
 306
 307 module_platform_driver(axp20x_regulator_driver);
 308
 309 MODULE_LICENSE("GPL v2");
 310 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 311 MODULE_DESCRIPTION("Regulator Driver for AXP20X PMIC");