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 AXP20X_DESC_IO(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg,   \
  36                        _emask, _enable_val, _disable_val)                       \
  37         [AXP20X_##_id] = {                                                      \
  38                 .name           = #_id,                                         \
  39                 .supply_name    = (_supply),                                    \
  40                 .type           = REGULATOR_VOLTAGE,                            \
  41                 .id             = AXP20X_##_id,                                 \
  42                 .n_voltages     = (((_max) - (_min)) / (_step) + 1),            \
  43                 .owner          = THIS_MODULE,                                  \
  44                 .min_uV         = (_min) * 1000,                                \
  45                 .uV_step        = (_step) * 1000,                               \
  46                 .vsel_reg       = (_vreg),                                      \
  47                 .vsel_mask      = (_vmask),                                     \
  48                 .enable_reg     = (_ereg),                                      \
  49                 .enable_mask    = (_emask),                                     \
  50                 .enable_val     = (_enable_val),                                \
  51                 .disable_val    = (_disable_val),                               \
  52                 .ops            = &axp20x_ops,                                  \
  53         }
  54
  55 #define AXP20X_DESC(_id, _supply, _min, _max, _step, _vreg, _vmask, _ereg,      \
  56                     _emask)                                                     \
  57         [AXP20X_##_id] = {                                                      \
  58                 .name           = #_id,                                         \
  59                 .supply_name    = (_supply),                                    \
  60                 .type           = REGULATOR_VOLTAGE,                            \
  61                 .id             = AXP20X_##_id,                                 \
  62                 .n_voltages     = (((_max) - (_min)) / (_step) + 1),            \
  63                 .owner          = THIS_MODULE,                                  \
  64                 .min_uV         = (_min) * 1000,                                \
  65                 .uV_step        = (_step) * 1000,                               \
  66                 .vsel_reg       = (_vreg),                                      \
  67                 .vsel_mask      = (_vmask),                                     \
  68                 .enable_reg     = (_ereg),                                      \
  69                 .enable_mask    = (_emask),                                     \
  70                 .ops            = &axp20x_ops,                                  \
  71         }
  72
  73 #define AXP20X_DESC_FIXED(_id, _supply, _volt)                                  \
  74         [AXP20X_##_id] = {                                                      \
  75                 .name           = #_id,                                         \
  76                 .supply_name    = (_supply),                                    \
  77                 .type           = REGULATOR_VOLTAGE,                            \
  78                 .id             = AXP20X_##_id,                                 \
  79                 .n_voltages     = 1,                                            \
  80                 .owner          = THIS_MODULE,                                  \
  81                 .min_uV         = (_volt) * 1000,                               \
  82                 .ops            = &axp20x_ops_fixed                             \
  83         }
  84
  85 #define AXP20X_DESC_TABLE(_id, _supply, _table, _vreg, _vmask, _ereg, _emask)   \
  86         [AXP20X_##_id] = {                                                      \
  87                 .name           = #_id,                                         \
  88                 .supply_name    = (_supply),                                    \
  89                 .type           = REGULATOR_VOLTAGE,                            \
  90                 .id             = AXP20X_##_id,                                 \
  91                 .n_voltages     = ARRAY_SIZE(_table),                           \
  92                 .owner          = THIS_MODULE,                                  \
  93                 .vsel_reg       = (_vreg),                                      \
  94                 .vsel_mask      = (_vmask),                                     \
  95                 .enable_reg     = (_ereg),                                      \
  96                 .enable_mask    = (_emask),                                     \
  97                 .volt_table     = (_table),                                     \
  98                 .ops            = &axp20x_ops_table,                            \
  99         }
 100
 101 static const int axp20x_ldo4_data[] = { 1250000, 1300000, 1400000, 1500000, 1600000,
 102                                         1700000, 1800000, 1900000, 2000000, 2500000,
 103                                         2700000, 2800000, 3000000, 3100000, 3200000,
 104                                         3300000 };
 105
 106 static struct regulator_ops axp20x_ops_fixed = {
 107         .list_voltage           = regulator_list_voltage_linear,
 108 };
 109
 110 static struct regulator_ops axp20x_ops_table = {
 111         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 112         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 113         .list_voltage           = regulator_list_voltage_table,
 114         .map_voltage            = regulator_map_voltage_ascend,
 115         .enable                 = regulator_enable_regmap,
 116         .disable                = regulator_disable_regmap,
 117         .is_enabled             = regulator_is_enabled_regmap,
 118 };
 119
 120 static struct regulator_ops axp20x_ops = {
 121         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 122         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 123         .list_voltage           = regulator_list_voltage_linear,
 124         .enable                 = regulator_enable_regmap,
 125         .disable                = regulator_disable_regmap,
 126         .is_enabled             = regulator_is_enabled_regmap,
 127 };
 128
 129 static const struct regulator_desc axp20x_regulators[] = {
 130         AXP20X_DESC(DCDC2, "vin2", 700, 2275, 25, AXP20X_DCDC2_V_OUT, 0x3f,
 131                     AXP20X_PWR_OUT_CTRL, 0x10),
 132         AXP20X_DESC(DCDC3, "vin3", 700, 3500, 25, AXP20X_DCDC3_V_OUT, 0x7f,
 133                     AXP20X_PWR_OUT_CTRL, 0x02),
 134         AXP20X_DESC_FIXED(LDO1, "acin", 1300),
 135         AXP20X_DESC(LDO2, "ldo24in", 1800, 3300, 100, AXP20X_LDO24_V_OUT, 0xf0,
 136                     AXP20X_PWR_OUT_CTRL, 0x04),
 137         AXP20X_DESC(LDO3, "ldo3in", 700, 3500, 25, AXP20X_LDO3_V_OUT, 0x7f,
 138                     AXP20X_PWR_OUT_CTRL, 0x40),
 139         AXP20X_DESC_TABLE(LDO4, "ldo24in", axp20x_ldo4_data, AXP20X_LDO24_V_OUT, 0x0f,
 140                           AXP20X_PWR_OUT_CTRL, 0x08),
 141         AXP20X_DESC_IO(LDO5, "ldo5in", 1800, 3300, 100, AXP20X_LDO5_V_OUT, 0xf0,
 142                        AXP20X_GPIO0_CTRL, 0x07, AXP20X_IO_ENABLED,
 143                        AXP20X_IO_DISABLED),
 144 };
 145
 146 #define AXP_MATCH(_name, _id) \
 147         [AXP20X_##_id] = { \
 148                 .name           = #_name, \
 149                 .driver_data    = (void *) &axp20x_regulators[AXP20X_##_id], \
 150         }
 151
 152 static struct of_regulator_match axp20x_matches[] = {
 153         AXP_MATCH(dcdc2, DCDC2),
 154         AXP_MATCH(dcdc3, DCDC3),
 155         AXP_MATCH(ldo1, LDO1),
 156         AXP_MATCH(ldo2, LDO2),
 157         AXP_MATCH(ldo3, LDO3),
 158         AXP_MATCH(ldo4, LDO4),
 159         AXP_MATCH(ldo5, LDO5),
 160 };
 161
 162 static int axp20x_set_dcdc_freq(struct platform_device *pdev, u32 dcdcfreq)
 163 {
 164         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 165
 166         if (dcdcfreq < 750) {
 167                 dcdcfreq = 750;
 168                 dev_warn(&pdev->dev, "DCDC frequency too low. Set to 750kHz\n");
 169         }
 170
 171         if (dcdcfreq > 1875) {
 172                 dcdcfreq = 1875;
 173                 dev_warn(&pdev->dev, "DCDC frequency too high. Set to 1875kHz\n");
 174         }
 175
 176         dcdcfreq = (dcdcfreq - 750) / 75;
 177
 178         return regmap_update_bits(axp20x->regmap, AXP20X_DCDC_FREQ,
 179                                   AXP20X_FREQ_DCDC_MASK, dcdcfreq);
 180 }
 181
 182 static int axp20x_regulator_parse_dt(struct platform_device *pdev)
 183 {
 184         struct device_node *np, *regulators;
 185         int ret;
 186         u32 dcdcfreq;
 187
 188         np = of_node_get(pdev->dev.parent->of_node);
 189         if (!np)
 190                 return 0;
 191
 192         regulators = of_get_child_by_name(np, "regulators");
 193         if (!regulators) {
 194                 dev_warn(&pdev->dev, "regulators node not found\n");
 195         } else {
 196                 ret = of_regulator_match(&pdev->dev, regulators, axp20x_matches,
 197                                          ARRAY_SIZE(axp20x_matches));
 198                 if (ret < 0) {
 199                         dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
 200                         return ret;
 201                 }
 202
 203                 dcdcfreq = 1500;
 204                 of_property_read_u32(regulators, "x-powers,dcdc-freq", &dcdcfreq);
 205                 ret = axp20x_set_dcdc_freq(pdev, dcdcfreq);
 206                 if (ret < 0) {
 207                         dev_err(&pdev->dev, "Error setting dcdc frequency: %d\n", ret);
 208                         return ret;
 209                 }
 210
 211                 of_node_put(regulators);
 212         }
 213
 214         return 0;
 215 }
 216
 217 static int axp20x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 workmode)
 218 {
 219         unsigned int mask = AXP20X_WORKMODE_DCDC2_MASK;
 220
 221         if ((id != AXP20X_DCDC2) && (id != AXP20X_DCDC3))
 222                 return -EINVAL;
 223
 224         if (id == AXP20X_DCDC3)
 225                 mask = AXP20X_WORKMODE_DCDC3_MASK;
 226
 227         workmode <<= ffs(mask) - 1;
 228
 229         return regmap_update_bits(rdev->regmap, AXP20X_DCDC_MODE, mask, workmode);
 230 }
 231
 232 static int axp20x_regulator_probe(struct platform_device *pdev)
 233 {
 234         struct regulator_dev *rdev;
 235         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 236         struct regulator_config config = { };
 237         struct regulator_init_data *init_data;
 238         int ret, i;
 239         u32 workmode;
 240
 241         ret = axp20x_regulator_parse_dt(pdev);
 242         if (ret)
 243                 return ret;
 244
 245         for (i = 0; i < AXP20X_REG_ID_MAX; i++) {
 246                 init_data = axp20x_matches[i].init_data;
 247
 248                 config.dev = &pdev->dev;
 249                 config.init_data = init_data;
 250                 config.regmap = axp20x->regmap;
 251                 config.of_node = axp20x_matches[i].of_node;
 252
 253                 rdev = devm_regulator_register(&pdev->dev, &axp20x_regulators[i],
 254                                                &config);
 255                 if (IS_ERR(rdev)) {
 256                         dev_err(&pdev->dev, "Failed to register %s\n",
 257                                 axp20x_regulators[i].name);
 258
 259                         return PTR_ERR(rdev);
 260                 }
 261
 262                 ret = of_property_read_u32(axp20x_matches[i].of_node, "x-powers,dcdc-workmode",
 263                                            &workmode);
 264                 if (!ret) {
 265                         if (axp20x_set_dcdc_workmode(rdev, i, workmode))
 266                                 dev_err(&pdev->dev, "Failed to set workmode on %s\n",
 267                                         axp20x_regulators[i].name);
 268                 }
 269         }
 270
 271         return 0;
 272 }
 273
 274 static struct platform_driver axp20x_regulator_driver = {
 275         .probe  = axp20x_regulator_probe,
 276         .driver = {
 277                 .name           = "axp20x-regulator",
 278                 .owner          = THIS_MODULE,
 279         },
 280 };
 281
 282 module_platform_driver(axp20x_regulator_driver);
 283
 284 MODULE_LICENSE("GPL v2");
 285 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 286 MODULE_DESCRIPTION("Regulator Driver for AXP20X PMIC");