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