drivers/regulator/aw37503-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // AWINIC AW37503 Regulator Driver
   4 //
   5 // Copyright (C) 2023 awinic. All Rights Reserved
   6 //
   7 // Author: <like@awinic.com>
   8
   9 #include <linux/err.h>
  10 #include <linux/gpio/consumer.h>
  11 #include <linux/i2c.h>
  12 #include <linux/module.h>
  13 #include <linux/regmap.h>
  14 #include <linux/regulator/driver.h>
  15 #include <linux/regulator/machine.h>
  16
  17 #define AW37503_REG_VPOS                0x00
  18 #define AW37503_REG_VNEG                0x01
  19 #define AW37503_REG_APPS                0x03
  20 #define AW37503_REG_CONTROL             0x04
  21 #define AW37503_REG_WPRTEN              0x21
  22
  23 #define AW37503_VOUT_MASK               0x1F
  24 #define AW37503_VOUT_N_VOLTAGE          0x15
  25 #define AW37503_VOUT_VMIN               4000000
  26 #define AW37503_VOUT_VMAX               6000000
  27 #define AW37503_VOUT_STEP               100000
  28
  29 #define AW37503_REG_APPS_DIS_VPOS       BIT(1)
  30 #define AW37503_REG_APPS_DIS_VNEG       BIT(0)
  31
  32 #define AW37503_REGULATOR_ID_VPOS       0
  33 #define AW37503_REGULATOR_ID_VNEG       1
  34 #define AW37503_MAX_REGULATORS          2
  35
  36 struct aw37503_reg_pdata {
  37         struct gpio_desc *en_gpiod;
  38         int ena_gpio_state;
  39 };
  40
  41 struct aw37503_regulator {
  42         struct device *dev;
  43         struct aw37503_reg_pdata reg_pdata[AW37503_MAX_REGULATORS];
  44 };
  45
  46 static int aw37503_regulator_enable(struct regulator_dev *rdev)
  47 {
  48         struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
  49         int id = rdev_get_id(rdev);
  50         struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
  51         int ret;
  52
  53         if (!IS_ERR(rpdata->en_gpiod)) {
  54                 gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
  55                 rpdata->ena_gpio_state = 1;
  56         }
  57
  58         /* Hardware automatically enable discharge bit in enable */
  59         if (rdev->constraints->active_discharge ==
  60                         REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
  61                 ret = regulator_set_active_discharge_regmap(rdev, false);
  62                 if (ret < 0) {
  63                         dev_err(chip->dev, "Failed to disable active discharge: %d\n",
  64                                 ret);
  65                         return ret;
  66                 }
  67         }
  68
  69         return 0;
  70 }
  71
  72 static int aw37503_regulator_disable(struct regulator_dev *rdev)
  73 {
  74         struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
  75         int id = rdev_get_id(rdev);
  76         struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
  77
  78         if (!IS_ERR(rpdata->en_gpiod)) {
  79                 gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
  80                 rpdata->ena_gpio_state = 0;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static int aw37503_regulator_is_enabled(struct regulator_dev *rdev)
  87 {
  88         struct aw37503_regulator *chip = rdev_get_drvdata(rdev);
  89         int id = rdev_get_id(rdev);
  90         struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[id];
  91
  92         if (!IS_ERR(rpdata->en_gpiod))
  93                 return rpdata->ena_gpio_state;
  94
  95         return 1;
  96 }
  97
  98 static const struct regulator_ops aw37503_regulator_ops = {
  99         .enable = aw37503_regulator_enable,
 100         .disable = aw37503_regulator_disable,
 101         .is_enabled = aw37503_regulator_is_enabled,
 102         .list_voltage = regulator_list_voltage_linear,
 103         .map_voltage = regulator_map_voltage_linear,
 104         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 105         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 106         .set_active_discharge = regulator_set_active_discharge_regmap,
 107 };
 108
 109 static int aw37503_of_parse_cb(struct device_node *np,
 110                                 const struct regulator_desc *desc,
 111                                 struct regulator_config *config)
 112 {
 113         struct aw37503_regulator *chip = config->driver_data;
 114         struct aw37503_reg_pdata *rpdata = &chip->reg_pdata[desc->id];
 115         int ret;
 116
 117         rpdata->en_gpiod = devm_fwnode_gpiod_get(chip->dev, of_fwnode_handle(np),
 118                                                  "enable", GPIOD_OUT_LOW,
 119                                                  "enable");
 120
 121         if (IS_ERR(rpdata->en_gpiod)) {
 122                 ret = PTR_ERR(rpdata->en_gpiod);
 123
 124                 /* Ignore the error other than probe defer */
 125                 if (ret == -EPROBE_DEFER)
 126                         return ret;
 127                 return 0;
 128         }
 129
 130         return 0;
 131 }
 132
 133 #define AW37503_REGULATOR_DESC(_id, _name)              \
 134         [AW37503_REGULATOR_ID_##_id] = {                \
 135                 .name = "aw37503-"#_name,               \
 136                 .supply_name = "vin",                   \
 137                 .id = AW37503_REGULATOR_ID_##_id,       \
 138                 .of_match = of_match_ptr(#_name),       \
 139                 .of_parse_cb = aw37503_of_parse_cb,     \
 140                 .ops = &aw37503_regulator_ops,          \
 141                 .n_voltages = AW37503_VOUT_N_VOLTAGE,   \
 142                 .min_uV = AW37503_VOUT_VMIN,            \
 143                 .uV_step = AW37503_VOUT_STEP,           \
 144                 .enable_time = 500,                     \
 145                 .vsel_mask = AW37503_VOUT_MASK, \
 146                 .vsel_reg = AW37503_REG_##_id,          \
 147                 .active_discharge_off = 0,                      \
 148                 .active_discharge_on = AW37503_REG_APPS_DIS_##_id, \
 149                 .active_discharge_mask = AW37503_REG_APPS_DIS_##_id, \
 150                 .active_discharge_reg = AW37503_REG_APPS, \
 151                 .type = REGULATOR_VOLTAGE,              \
 152                 .owner = THIS_MODULE,                   \
 153         }
 154
 155 static const struct regulator_desc aw_regs_desc[AW37503_MAX_REGULATORS] = {
 156         AW37503_REGULATOR_DESC(VPOS, outp),
 157         AW37503_REGULATOR_DESC(VNEG, outn),
 158 };
 159
 160 static const struct regmap_range aw37503_no_reg_ranges[] = {
 161         regmap_reg_range(AW37503_REG_CONTROL + 1,
 162                          AW37503_REG_WPRTEN - 1),
 163 };
 164
 165 static const struct regmap_access_table aw37503_no_reg_table = {
 166         .no_ranges = aw37503_no_reg_ranges,
 167         .n_no_ranges = ARRAY_SIZE(aw37503_no_reg_ranges),
 168 };
 169
 170 static const struct regmap_config aw37503_regmap_config = {
 171         .reg_bits       = 8,
 172         .val_bits       = 8,
 173         .max_register   = AW37503_REG_WPRTEN,
 174         .rd_table       = &aw37503_no_reg_table,
 175         .wr_table       = &aw37503_no_reg_table,
 176 };
 177
 178 static int aw37503_probe(struct i2c_client *client)
 179 {
 180         struct device *dev = &client->dev;
 181         struct aw37503_regulator *chip;
 182         struct regulator_dev *rdev;
 183         struct regmap *regmap;
 184         struct regulator_config config = { };
 185         int id;
 186
 187         chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 188         if (!chip)
 189                 return -ENOMEM;
 190
 191         regmap = devm_regmap_init_i2c(client, &aw37503_regmap_config);
 192         if (IS_ERR(regmap))
 193                 return dev_err_probe(dev, PTR_ERR(regmap),
 194                                      "Failed to init regmap\n");
 195
 196         i2c_set_clientdata(client, chip);
 197         chip->dev = dev;
 198
 199         config.regmap = regmap;
 200         config.dev = dev;
 201         config.driver_data = chip;
 202
 203         for (id = 0; id < AW37503_MAX_REGULATORS; ++id) {
 204                 rdev = devm_regulator_register(dev, &aw_regs_desc[id],
 205                                                &config);
 206                 if (IS_ERR(rdev))
 207                         return dev_err_probe(dev, PTR_ERR(rdev),
 208                                              "Failed to register regulator %s\n",
 209                                              aw_regs_desc[id].name);
 210         }
 211         return 0;
 212 }
 213
 214 static const struct i2c_device_id aw37503_id[] = {
 215         {.name = "aw37503",},
 216         {},
 217 };
 218 MODULE_DEVICE_TABLE(i2c, aw37503_id);
 219
 220 static const struct of_device_id aw37503_of_match[] = {
 221         {.compatible = "awinic,aw37503",},
 222         { /* Sentinel */ },
 223 };
 224
 225 MODULE_DEVICE_TABLE(of, aw37503_of_match);
 226
 227 static struct i2c_driver aw37503_i2c_driver = {
 228         .driver = {
 229                 .name = "aw37503",
 230                 .of_match_table = aw37503_of_match,
 231         },
 232         .probe = aw37503_probe,
 233         .id_table = aw37503_id,
 234 };
 235
 236 module_i2c_driver(aw37503_i2c_driver);
 237
 238 MODULE_DESCRIPTION("aw37503 regulator driver");
 239 MODULE_AUTHOR("Alec Li <like@awinic.com>");
 240 MODULE_LICENSE("GPL");