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, _match, _supply, _min, _max, _step, _vreg, _vmask,  \
  36                        _ereg, _emask, _enable_val, _disable_val)                \
  37         [AXP20X_##_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             = AXP20X_##_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 AXP20X_DESC(_id, _match, _supply, _min, _max, _step, _vreg, _vmask,     \
  58                     _ereg, _emask)                                              \
  59         [AXP20X_##_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             = AXP20X_##_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 AXP20X_DESC_FIXED(_id, _match, _supply, _volt)                          \
  78         [AXP20X_##_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             = AXP20X_##_id,                                 \
  85                 .n_voltages     = 1,                                            \
  86                 .owner          = THIS_MODULE,                                  \
  87                 .min_uV         = (_volt) * 1000,                               \
  88                 .ops            = &axp20x_ops_fixed                             \
  89         }
  90
  91 #define AXP20X_DESC_TABLE(_id, _match, _supply, _table, _vreg, _vmask, _ereg,   \
  92                           _emask)                                               \
  93         [AXP20X_##_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             = AXP20X_##_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         AXP20X_DESC(DCDC2, "dcdc2", "vin2", 700, 2275, 25, AXP20X_DCDC2_V_OUT,
 140                     0x3f, AXP20X_PWR_OUT_CTRL, 0x10),
 141         AXP20X_DESC(DCDC3, "dcdc3", "vin3", 700, 3500, 25, AXP20X_DCDC3_V_OUT,
 142                     0x7f, AXP20X_PWR_OUT_CTRL, 0x02),
 143         AXP20X_DESC_FIXED(LDO1, "ldo1", "acin", 1300),
 144         AXP20X_DESC(LDO2, "ldo2", "ldo24in", 1800, 3300, 100,
 145                     AXP20X_LDO24_V_OUT, 0xf0, AXP20X_PWR_OUT_CTRL, 0x04),
 146         AXP20X_DESC(LDO3, "ldo3", "ldo3in", 700, 3500, 25, AXP20X_LDO3_V_OUT,
 147                     0x7f, AXP20X_PWR_OUT_CTRL, 0x40),
 148         AXP20X_DESC_TABLE(LDO4, "ldo4", "ldo24in", axp20x_ldo4_data,
 149                           AXP20X_LDO24_V_OUT, 0x0f, AXP20X_PWR_OUT_CTRL, 0x08),
 150         AXP20X_DESC_IO(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
 159         if (dcdcfreq < 750) {
 160                 dcdcfreq = 750;
 161                 dev_warn(&pdev->dev, "DCDC frequency too low. Set to 750kHz\n");
 162         }
 163
 164         if (dcdcfreq > 1875) {
 165                 dcdcfreq = 1875;
 166                 dev_warn(&pdev->dev, "DCDC frequency too high. Set to 1875kHz\n");
 167         }
 168
 169         dcdcfreq = (dcdcfreq - 750) / 75;
 170
 171         return regmap_update_bits(axp20x->regmap, AXP20X_DCDC_FREQ,
 172                                   AXP20X_FREQ_DCDC_MASK, dcdcfreq);
 173 }
 174
 175 static int axp20x_regulator_parse_dt(struct platform_device *pdev)
 176 {
 177         struct device_node *np, *regulators;
 178         int ret;
 179         u32 dcdcfreq;
 180
 181         np = of_node_get(pdev->dev.parent->of_node);
 182         if (!np)
 183                 return 0;
 184
 185         regulators = of_get_child_by_name(np, "regulators");
 186         if (!regulators) {
 187                 dev_warn(&pdev->dev, "regulators node not found\n");
 188         } else {
 189                 dcdcfreq = 1500;
 190                 of_property_read_u32(regulators, "x-powers,dcdc-freq", &dcdcfreq);
 191                 ret = axp20x_set_dcdc_freq(pdev, dcdcfreq);
 192                 if (ret < 0) {
 193                         dev_err(&pdev->dev, "Error setting dcdc frequency: %d\n", ret);
 194                         return ret;
 195                 }
 196
 197                 of_node_put(regulators);
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int axp20x_set_dcdc_workmode(struct regulator_dev *rdev, int id, u32 workmode)
 204 {
 205         unsigned int mask = AXP20X_WORKMODE_DCDC2_MASK;
 206
 207         if ((id != AXP20X_DCDC2) && (id != AXP20X_DCDC3))
 208                 return -EINVAL;
 209
 210         if (id == AXP20X_DCDC3)
 211                 mask = AXP20X_WORKMODE_DCDC3_MASK;
 212
 213         workmode <<= ffs(mask) - 1;
 214
 215         return regmap_update_bits(rdev->regmap, AXP20X_DCDC_MODE, mask, workmode);
 216 }
 217
 218 static int axp20x_regulator_probe(struct platform_device *pdev)
 219 {
 220         struct regulator_dev *rdev;
 221         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 222         struct regulator_config config = {
 223                 .dev = pdev->dev.parent,
 224                 .regmap = axp20x->regmap,
 225         };
 226         int ret, i;
 227         u32 workmode;
 228
 229         /* This only sets the dcdc freq. Ignore any errors */
 230         axp20x_regulator_parse_dt(pdev);
 231
 232         for (i = 0; i < AXP20X_REG_ID_MAX; i++) {
 233                 rdev = devm_regulator_register(&pdev->dev, &axp20x_regulators[i],
 234                                                &config);
 235                 if (IS_ERR(rdev)) {
 236                         dev_err(&pdev->dev, "Failed to register %s\n",
 237                                 axp20x_regulators[i].name);
 238
 239                         return PTR_ERR(rdev);
 240                 }
 241
 242                 ret = of_property_read_u32(rdev->dev.of_node,
 243                                            "x-powers,dcdc-workmode",
 244                                            &workmode);
 245                 if (!ret) {
 246                         if (axp20x_set_dcdc_workmode(rdev, i, workmode))
 247                                 dev_err(&pdev->dev, "Failed to set workmode on %s\n",
 248                                         axp20x_regulators[i].name);
 249                 }
 250         }
 251
 252         return 0;
 253 }
 254
 255 static struct platform_driver axp20x_regulator_driver = {
 256         .probe  = axp20x_regulator_probe,
 257         .driver = {
 258                 .name           = "axp20x-regulator",
 259         },
 260 };
 261
 262 module_platform_driver(axp20x_regulator_driver);
 263
 264 MODULE_LICENSE("GPL v2");
 265 MODULE_AUTHOR("Carlo Caione <carlo@caione.org>");
 266 MODULE_DESCRIPTION("Regulator Driver for AXP20X PMIC");