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1// SPDX-License-Identifier: GPL-2.0-or-later2//3// max77826-regulator.c - regulator driver for Maxim MAX778264//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 18enum 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 67enum 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 0x7f89#define MAX77826_MASK_BUCK 0xff90#define MAX77826_MASK_BUCKBOOST 0x7f91#define MAX77826_BUCK_RAMP_DELAY 1250092 93/* values in mV */94/* for LDO1-3 */95#define MAX77826_NMOS_LDO_VOLT_MIN 60000096#define MAX77826_NMOS_LDO_VOLT_MAX 218750097#define MAX77826_NMOS_LDO_VOLT_STEP 1250098 99/* for LDO4-15 */100#define MAX77826_PMOS_LDO_VOLT_MIN 800000101#define MAX77826_PMOS_LDO_VOLT_MAX 3975000102#define MAX77826_PMOS_LDO_VOLT_STEP 25000103 104/* for BUCK */105#define MAX77826_BUCK_VOLT_MIN 500000106#define MAX77826_BUCK_VOLT_MAX 1800000107#define MAX77826_BUCK_VOLT_STEP 6250108 109/* for BUCKBOOST */110#define MAX77826_BUCKBOOST_VOLT_MIN 2600000111#define MAX77826_BUCKBOOST_VOLT_MAX 4187500112#define MAX77826_BUCKBOOST_VOLT_STEP 12500113#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 154struct max77826_regulator_info {155 struct regmap *regmap;156};157 158static const struct regmap_config max77826_regmap_config = {159 .reg_bits = 8,160 .val_bits = 8,161 .max_register = MAX77826_REG_DEVICE_ID,162};163 164static int max77826_set_voltage_time_sel(struct regulator_dev *,165 unsigned int old_selector,166 unsigned int new_selector);167 168static 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 178static 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 189static 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 209static 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 222static 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 234static 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 274static const struct of_device_id __maybe_unused max77826_of_match[] = {275 { .compatible = "maxim,max77826" },276 { /* sentinel */ }277};278MODULE_DEVICE_TABLE(of, max77826_of_match);279 280static const struct i2c_device_id max77826_id[] = {281 { "max77826-regulator" },282 { /* sentinel */ }283};284MODULE_DEVICE_TABLE(i2c, max77826_id);285 286static 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};295module_i2c_driver(max77826_regulator_driver);296 297MODULE_AUTHOR("Iskren Chernev <iskren.chernev@gmail.com>");298MODULE_DESCRIPTION("MAX77826 PMIC regulator driver");299MODULE_LICENSE("GPL");300