drivers/regulator/max77826-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 //
   3 // max77826-regulator.c  - regulator driver for Maxim MAX77826
   4 //
   5 // Author: Iskren Chernev <iskren.chernev@gmail.com>
   6
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/err.h>
  11 #include <linux/of.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/of_regulator.h>
  15 #include <linux/i2c.h>
  16 #include <linux/regmap.h>
  17
  18 enum max77826_registers {
  19         MAX77826_REG_INT_SRC = 0x00,
  20         MAX77826_REG_SYS_INT,
  21         MAX77826_REG_INT1,
  22         MAX77826_REG_INT2,
  23         MAX77826_REG_BB_INT,
  24         MAX77826_REG_INT_SRC_M,
  25         MAX77826_REG_TOPSYS_INT_M,
  26         MAX77826_REG_INT1_M,
  27         MAX77826_REG_INT2_M,
  28         MAX77826_REG_BB_INT_M,
  29         MAX77826_REG_TOPSYS_STAT,
  30         MAX77826_REG_STAT1,
  31         MAX77826_REG_STAT2,
  32         MAX77826_REG_BB_STAT,
  33         /* 0x0E - 0x0F: Reserved */
  34         MAX77826_REG_LDO_OPMD1 = 0x10,
  35         MAX77826_REG_LDO_OPMD2,
  36         MAX77826_REG_LDO_OPMD3,
  37         MAX77826_REG_LDO_OPMD4,
  38         MAX77826_REG_B_BB_OPMD,
  39         /* 0x15 - 0x1F: Reserved */
  40         MAX77826_REG_LDO1_CFG = 0x20,
  41         MAX77826_REG_LDO2_CFG,
  42         MAX77826_REG_LDO3_CFG,
  43         MAX77826_REG_LDO4_CFG,
  44         MAX77826_REG_LDO5_CFG,
  45         MAX77826_REG_LDO6_CFG,
  46         MAX77826_REG_LDO7_CFG,
  47         MAX77826_REG_LDO8_CFG,
  48         MAX77826_REG_LDO9_CFG,
  49         MAX77826_REG_LDO10_CFG,
  50         MAX77826_REG_LDO11_CFG,
  51         MAX77826_REG_LDO12_CFG,
  52         MAX77826_REG_LDO13_CFG,
  53         MAX77826_REG_LDO14_CFG,
  54         MAX77826_REG_LDO15_CFG,
  55         /* 0x2F: Reserved */
  56         MAX77826_REG_BUCK_CFG = 0x30,
  57         MAX77826_REG_BUCK_VOUT,
  58         MAX77826_REG_BB_CFG,
  59         MAX77826_REG_BB_VOUT,
  60         /* 0x34 - 0x3F: Reserved */
  61         MAX77826_REG_BUCK_SS_FREQ = 0x40,
  62         MAX77826_REG_UVLO_FALL,
  63         /* 0x42 - 0xCE: Reserved */
  64         MAX77826_REG_DEVICE_ID = 0xCF,
  65 };
  66
  67 enum max77826_regulators {
  68         MAX77826_LDO1 = 0,
  69         MAX77826_LDO2,
  70         MAX77826_LDO3,
  71         MAX77826_LDO4,
  72         MAX77826_LDO5,
  73         MAX77826_LDO6,
  74         MAX77826_LDO7,
  75         MAX77826_LDO8,
  76         MAX77826_LDO9,
  77         MAX77826_LDO10,
  78         MAX77826_LDO11,
  79         MAX77826_LDO12,
  80         MAX77826_LDO13,
  81         MAX77826_LDO14,
  82         MAX77826_LDO15,
  83         MAX77826_BUCK,
  84         MAX77826_BUCKBOOST,
  85         MAX77826_MAX_REGULATORS,
  86 };
  87
  88 #define MAX77826_MASK_LDO               0x7f
  89 #define MAX77826_MASK_BUCK              0xff
  90 #define MAX77826_MASK_BUCKBOOST         0x7f
  91 #define MAX77826_BUCK_RAMP_DELAY        12500
  92
  93 /* values in mV */
  94 /* for LDO1-3 */
  95 #define MAX77826_NMOS_LDO_VOLT_MIN      600000
  96 #define MAX77826_NMOS_LDO_VOLT_MAX      2187500
  97 #define MAX77826_NMOS_LDO_VOLT_STEP     12500
  98
  99 /* for LDO4-15 */
 100 #define MAX77826_PMOS_LDO_VOLT_MIN      800000
 101 #define MAX77826_PMOS_LDO_VOLT_MAX      3975000
 102 #define MAX77826_PMOS_LDO_VOLT_STEP     25000
 103
 104 /* for BUCK */
 105 #define MAX77826_BUCK_VOLT_MIN          500000
 106 #define MAX77826_BUCK_VOLT_MAX          1800000
 107 #define MAX77826_BUCK_VOLT_STEP         6250
 108
 109 /* for BUCKBOOST */
 110 #define MAX77826_BUCKBOOST_VOLT_MIN     2600000
 111 #define MAX77826_BUCKBOOST_VOLT_MAX     4187500
 112 #define MAX77826_BUCKBOOST_VOLT_STEP    12500
 113 #define MAX77826_VOLT_RANGE(_type)                                      \
 114         ((MAX77826_ ## _type ## _VOLT_MAX -                             \
 115           MAX77826_ ## _type ## _VOLT_MIN) /                            \
 116          MAX77826_ ## _type ## _VOLT_STEP + 1)
 117
 118 #define MAX77826_LDO(_id, _type)                                        \
 119         [MAX77826_LDO ## _id] = {                                       \
 120                 .id = MAX77826_LDO ## _id,                              \
 121                 .name = "LDO"#_id,                                      \
 122                 .of_match = of_match_ptr("LDO"#_id),                    \
 123                 .regulators_node = "regulators",                        \
 124                 .ops = &max77826_most_ops,                              \
 125                 .min_uV = MAX77826_ ## _type ## _LDO_VOLT_MIN,          \
 126                 .uV_step = MAX77826_ ## _type ## _LDO_VOLT_STEP,        \
 127                 .n_voltages = MAX77826_VOLT_RANGE(_type ## _LDO),       \
 128                 .enable_reg = MAX77826_REG_LDO_OPMD1 + (_id - 1) / 4,   \
 129                 .enable_mask = BIT(((_id - 1) % 4) * 2 + 1),            \
 130                 .vsel_reg = MAX77826_REG_LDO1_CFG + (_id - 1),          \
 131                 .vsel_mask = MAX77826_MASK_LDO,                         \
 132                 .owner = THIS_MODULE,                                   \
 133         }
 134
 135 #define MAX77826_BUCK(_idx, _id, _ops)                                  \
 136         [MAX77826_ ## _id] = {                                          \
 137                 .id = MAX77826_ ## _id,                                 \
 138                 .name = #_id,                                           \
 139                 .of_match = of_match_ptr(#_id),                         \
 140                 .regulators_node = "regulators",                        \
 141                 .ops = &_ops,                                           \
 142                 .min_uV =  MAX77826_ ## _id ## _VOLT_MIN,               \
 143                 .uV_step = MAX77826_ ## _id ## _VOLT_STEP,              \
 144                 .n_voltages = MAX77826_VOLT_RANGE(_id),                 \
 145                 .enable_reg = MAX77826_REG_B_BB_OPMD,                   \
 146                 .enable_mask = BIT(_idx * 2 + 1),                       \
 147                 .vsel_reg = MAX77826_REG_BUCK_VOUT + _idx * 2,          \
 148                 .vsel_mask = MAX77826_MASK_ ## _id,                     \
 149                 .owner = THIS_MODULE,                                   \
 150         }
 151
 152
 153
 154 struct max77826_regulator_info {
 155         struct regmap *regmap;
 156 };
 157
 158 static const struct regmap_config max77826_regmap_config = {
 159         .reg_bits = 8,
 160         .val_bits = 8,
 161         .max_register = MAX77826_REG_DEVICE_ID,
 162 };
 163
 164 static int max77826_set_voltage_time_sel(struct regulator_dev *,
 165                                 unsigned int old_selector,
 166                                 unsigned int new_selector);
 167
 168 static const struct regulator_ops max77826_most_ops = {
 169         .enable                 = regulator_enable_regmap,
 170         .disable                = regulator_disable_regmap,
 171         .is_enabled             = regulator_is_enabled_regmap,
 172         .list_voltage           = regulator_list_voltage_linear,
 173         .map_voltage            = regulator_map_voltage_linear,
 174         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 175         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 176 };
 177
 178 static const struct regulator_ops max77826_buck_ops = {
 179         .enable                 = regulator_enable_regmap,
 180         .disable                = regulator_disable_regmap,
 181         .is_enabled             = regulator_is_enabled_regmap,
 182         .list_voltage           = regulator_list_voltage_linear,
 183         .map_voltage            = regulator_map_voltage_linear,
 184         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 185         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 186         .set_voltage_time_sel   = max77826_set_voltage_time_sel,
 187 };
 188
 189 static const struct regulator_desc max77826_regulators_desc[] = {
 190         MAX77826_LDO(1, NMOS),
 191         MAX77826_LDO(2, NMOS),
 192         MAX77826_LDO(3, NMOS),
 193         MAX77826_LDO(4, PMOS),
 194         MAX77826_LDO(5, PMOS),
 195         MAX77826_LDO(6, PMOS),
 196         MAX77826_LDO(7, PMOS),
 197         MAX77826_LDO(8, PMOS),
 198         MAX77826_LDO(9, PMOS),
 199         MAX77826_LDO(10, PMOS),
 200         MAX77826_LDO(11, PMOS),
 201         MAX77826_LDO(12, PMOS),
 202         MAX77826_LDO(13, PMOS),
 203         MAX77826_LDO(14, PMOS),
 204         MAX77826_LDO(15, PMOS),
 205         MAX77826_BUCK(0, BUCK, max77826_buck_ops),
 206         MAX77826_BUCK(1, BUCKBOOST, max77826_most_ops),
 207 };
 208
 209 static int max77826_set_voltage_time_sel(struct regulator_dev *rdev,
 210                                 unsigned int old_selector,
 211                                 unsigned int new_selector)
 212 {
 213         if (new_selector > old_selector) {
 214                 return DIV_ROUND_UP(MAX77826_BUCK_VOLT_STEP *
 215                                 (new_selector - old_selector),
 216                                 MAX77826_BUCK_RAMP_DELAY);
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int max77826_read_device_id(struct regmap *regmap, struct device *dev)
 223 {
 224         unsigned int device_id;
 225         int res;
 226
 227         res = regmap_read(regmap, MAX77826_REG_DEVICE_ID, &device_id);
 228         if (!res)
 229                 dev_dbg(dev, "DEVICE_ID: 0x%x\n", device_id);
 230
 231         return res;
 232 }
 233
 234 static int max77826_i2c_probe(struct i2c_client *client)
 235 {
 236         struct device *dev = &client->dev;
 237         struct max77826_regulator_info *info;
 238         struct regulator_config config = {};
 239         struct regulator_dev *rdev;
 240         struct regmap *regmap;
 241         int i;
 242
 243         info = devm_kzalloc(dev, sizeof(struct max77826_regulator_info),
 244                                 GFP_KERNEL);
 245         if (!info)
 246                 return -ENOMEM;
 247
 248         regmap = devm_regmap_init_i2c(client, &max77826_regmap_config);
 249         if (IS_ERR(regmap)) {
 250                 dev_err(dev, "Failed to allocate regmap!\n");
 251                 return PTR_ERR(regmap);
 252         }
 253
 254         info->regmap = regmap;
 255         i2c_set_clientdata(client, info);
 256
 257         config.dev = dev;
 258         config.regmap = regmap;
 259         config.driver_data = info;
 260
 261         for (i = 0; i < MAX77826_MAX_REGULATORS; i++) {
 262                 rdev = devm_regulator_register(dev,
 263                                                &max77826_regulators_desc[i],
 264                                                &config);
 265                 if (IS_ERR(rdev)) {
 266                         dev_err(dev, "Failed to register regulator!\n");
 267                         return PTR_ERR(rdev);
 268                 }
 269         }
 270
 271         return max77826_read_device_id(regmap, dev);
 272 }
 273
 274 static const struct of_device_id __maybe_unused max77826_of_match[] = {
 275         { .compatible = "maxim,max77826" },
 276         { /* sentinel */ }
 277 };
 278 MODULE_DEVICE_TABLE(of, max77826_of_match);
 279
 280 static const struct i2c_device_id max77826_id[] = {
 281         { "max77826-regulator" },
 282         { /* sentinel */ }
 283 };
 284 MODULE_DEVICE_TABLE(i2c, max77826_id);
 285
 286 static struct i2c_driver max77826_regulator_driver = {
 287         .driver = {
 288                 .name = "max77826",
 289                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 290                 .of_match_table = of_match_ptr(max77826_of_match),
 291         },
 292         .probe = max77826_i2c_probe,
 293         .id_table = max77826_id,
 294 };
 295 module_i2c_driver(max77826_regulator_driver);
 296
 297 MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");
 298 MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");
 299 MODULE_LICENSE("GPL");