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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Regulator driver for National Semiconductors LP3971 PMIC chip4 *5 * Copyright (C) 2009 Samsung Electronics6 * Author: Marek Szyprowski <m.szyprowski@samsung.com>7 *8 * Based on wm8350.c9 */10 11#include <linux/bug.h>12#include <linux/err.h>13#include <linux/i2c.h>14#include <linux/kernel.h>15#include <linux/module.h>16#include <linux/regulator/driver.h>17#include <linux/regulator/lp3971.h>18#include <linux/slab.h>19 20struct lp3971 {21 struct device *dev;22 struct mutex io_lock;23 struct i2c_client *i2c;24};25 26static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);27static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);28 29#define LP3971_SYS_CONTROL1_REG 0x0730 31/* System control register 1 initial value,32 bits 4 and 5 are EPROM programmable */33#define SYS_CONTROL1_INIT_VAL 0x4034#define SYS_CONTROL1_INIT_MASK 0xCF35 36#define LP3971_BUCK_VOL_ENABLE_REG 0x1037#define LP3971_BUCK_VOL_CHANGE_REG 0x2038 39/* Voltage control registers shift:40 LP3971_BUCK1 -> 041 LP3971_BUCK2 -> 442 LP3971_BUCK3 -> 643*/44#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))45#define BUCK_VOL_CHANGE_FLAG_GO 0x0146#define BUCK_VOL_CHANGE_FLAG_TARGET 0x0247#define BUCK_VOL_CHANGE_FLAG_MASK 0x0348 49#define LP3971_BUCK1_BASE 0x2350#define LP3971_BUCK2_BASE 0x2951#define LP3971_BUCK3_BASE 0x3252 53static const int buck_base_addr[] = {54 LP3971_BUCK1_BASE,55 LP3971_BUCK2_BASE,56 LP3971_BUCK3_BASE,57};58 59#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])60#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)61 62static const unsigned int buck_voltage_map[] = {63 0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,64 1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,65 1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,66 3000000, 3300000,67};68 69#define BUCK_TARGET_VOL_MASK 0x3f70 71#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)72 73#define LP3971_LDO_ENABLE_REG 0x1274#define LP3971_LDO_VOL_CONTR_BASE 0x3975 76/* Voltage control registers:77 LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 078 LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 079 LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 180 LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 181 LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 282*/83#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))84 85/* Voltage control registers shift:86 LP3971_LDO1 -> 0, LP3971_LDO2 -> 487 LP3971_LDO3 -> 0, LP3971_LDO4 -> 488 LP3971_LDO5 -> 089*/90#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)91#define LDO_VOL_CONTR_MASK 0x0f92 93static const unsigned int ldo45_voltage_map[] = {94 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,95 1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,96};97 98static const unsigned int ldo123_voltage_map[] = {99 1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,100 2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,101};102 103#define LDO_VOL_MIN_IDX 0x00104#define LDO_VOL_MAX_IDX 0x0f105 106static int lp3971_ldo_is_enabled(struct regulator_dev *dev)107{108 struct lp3971 *lp3971 = rdev_get_drvdata(dev);109 int ldo = rdev_get_id(dev) - LP3971_LDO1;110 u16 mask = 1 << (1 + ldo);111 u16 val;112 113 val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);114 return (val & mask) != 0;115}116 117static int lp3971_ldo_enable(struct regulator_dev *dev)118{119 struct lp3971 *lp3971 = rdev_get_drvdata(dev);120 int ldo = rdev_get_id(dev) - LP3971_LDO1;121 u16 mask = 1 << (1 + ldo);122 123 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);124}125 126static int lp3971_ldo_disable(struct regulator_dev *dev)127{128 struct lp3971 *lp3971 = rdev_get_drvdata(dev);129 int ldo = rdev_get_id(dev) - LP3971_LDO1;130 u16 mask = 1 << (1 + ldo);131 132 return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);133}134 135static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)136{137 struct lp3971 *lp3971 = rdev_get_drvdata(dev);138 int ldo = rdev_get_id(dev) - LP3971_LDO1;139 u16 val, reg;140 141 reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));142 val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;143 144 return val;145}146 147static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,148 unsigned int selector)149{150 struct lp3971 *lp3971 = rdev_get_drvdata(dev);151 int ldo = rdev_get_id(dev) - LP3971_LDO1;152 153 return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),154 LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),155 selector << LDO_VOL_CONTR_SHIFT(ldo));156}157 158static const struct regulator_ops lp3971_ldo_ops = {159 .list_voltage = regulator_list_voltage_table,160 .map_voltage = regulator_map_voltage_ascend,161 .is_enabled = lp3971_ldo_is_enabled,162 .enable = lp3971_ldo_enable,163 .disable = lp3971_ldo_disable,164 .get_voltage_sel = lp3971_ldo_get_voltage_sel,165 .set_voltage_sel = lp3971_ldo_set_voltage_sel,166};167 168static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)169{170 struct lp3971 *lp3971 = rdev_get_drvdata(dev);171 int buck = rdev_get_id(dev) - LP3971_DCDC1;172 u16 mask = 1 << (buck * 2);173 u16 val;174 175 val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);176 return (val & mask) != 0;177}178 179static int lp3971_dcdc_enable(struct regulator_dev *dev)180{181 struct lp3971 *lp3971 = rdev_get_drvdata(dev);182 int buck = rdev_get_id(dev) - LP3971_DCDC1;183 u16 mask = 1 << (buck * 2);184 185 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);186}187 188static int lp3971_dcdc_disable(struct regulator_dev *dev)189{190 struct lp3971 *lp3971 = rdev_get_drvdata(dev);191 int buck = rdev_get_id(dev) - LP3971_DCDC1;192 u16 mask = 1 << (buck * 2);193 194 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);195}196 197static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)198{199 struct lp3971 *lp3971 = rdev_get_drvdata(dev);200 int buck = rdev_get_id(dev) - LP3971_DCDC1;201 u16 reg;202 203 reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));204 reg &= BUCK_TARGET_VOL_MASK;205 206 return reg;207}208 209static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,210 unsigned int selector)211{212 struct lp3971 *lp3971 = rdev_get_drvdata(dev);213 int buck = rdev_get_id(dev) - LP3971_DCDC1;214 int ret;215 216 ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),217 BUCK_TARGET_VOL_MASK, selector);218 if (ret)219 return ret;220 221 ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,222 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),223 BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));224 if (ret)225 return ret;226 227 return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,228 BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),229 0 << BUCK_VOL_CHANGE_SHIFT(buck));230}231 232static const struct regulator_ops lp3971_dcdc_ops = {233 .list_voltage = regulator_list_voltage_table,234 .map_voltage = regulator_map_voltage_ascend,235 .is_enabled = lp3971_dcdc_is_enabled,236 .enable = lp3971_dcdc_enable,237 .disable = lp3971_dcdc_disable,238 .get_voltage_sel = lp3971_dcdc_get_voltage_sel,239 .set_voltage_sel = lp3971_dcdc_set_voltage_sel,240};241 242static const struct regulator_desc regulators[] = {243 {244 .name = "LDO1",245 .id = LP3971_LDO1,246 .ops = &lp3971_ldo_ops,247 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),248 .volt_table = ldo123_voltage_map,249 .type = REGULATOR_VOLTAGE,250 .owner = THIS_MODULE,251 },252 {253 .name = "LDO2",254 .id = LP3971_LDO2,255 .ops = &lp3971_ldo_ops,256 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),257 .volt_table = ldo123_voltage_map,258 .type = REGULATOR_VOLTAGE,259 .owner = THIS_MODULE,260 },261 {262 .name = "LDO3",263 .id = LP3971_LDO3,264 .ops = &lp3971_ldo_ops,265 .n_voltages = ARRAY_SIZE(ldo123_voltage_map),266 .volt_table = ldo123_voltage_map,267 .type = REGULATOR_VOLTAGE,268 .owner = THIS_MODULE,269 },270 {271 .name = "LDO4",272 .id = LP3971_LDO4,273 .ops = &lp3971_ldo_ops,274 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),275 .volt_table = ldo45_voltage_map,276 .type = REGULATOR_VOLTAGE,277 .owner = THIS_MODULE,278 },279 {280 .name = "LDO5",281 .id = LP3971_LDO5,282 .ops = &lp3971_ldo_ops,283 .n_voltages = ARRAY_SIZE(ldo45_voltage_map),284 .volt_table = ldo45_voltage_map,285 .type = REGULATOR_VOLTAGE,286 .owner = THIS_MODULE,287 },288 {289 .name = "DCDC1",290 .id = LP3971_DCDC1,291 .ops = &lp3971_dcdc_ops,292 .n_voltages = ARRAY_SIZE(buck_voltage_map),293 .volt_table = buck_voltage_map,294 .type = REGULATOR_VOLTAGE,295 .owner = THIS_MODULE,296 },297 {298 .name = "DCDC2",299 .id = LP3971_DCDC2,300 .ops = &lp3971_dcdc_ops,301 .n_voltages = ARRAY_SIZE(buck_voltage_map),302 .volt_table = buck_voltage_map,303 .type = REGULATOR_VOLTAGE,304 .owner = THIS_MODULE,305 },306 {307 .name = "DCDC3",308 .id = LP3971_DCDC3,309 .ops = &lp3971_dcdc_ops,310 .n_voltages = ARRAY_SIZE(buck_voltage_map),311 .volt_table = buck_voltage_map,312 .type = REGULATOR_VOLTAGE,313 .owner = THIS_MODULE,314 },315};316 317static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,318 u16 *dest)319{320 int ret;321 322 if (count != 1)323 return -EIO;324 ret = i2c_smbus_read_byte_data(i2c, reg);325 if (ret < 0)326 return ret;327 328 *dest = ret;329 return 0;330}331 332static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,333 const u16 *src)334{335 if (count != 1)336 return -EIO;337 return i2c_smbus_write_byte_data(i2c, reg, *src);338}339 340static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)341{342 u16 val = 0;343 344 mutex_lock(&lp3971->io_lock);345 346 lp3971_i2c_read(lp3971->i2c, reg, 1, &val);347 348 dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,349 (unsigned)val&0xff);350 351 mutex_unlock(&lp3971->io_lock);352 353 return val & 0xff;354}355 356static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)357{358 u16 tmp;359 int ret;360 361 mutex_lock(&lp3971->io_lock);362 363 ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);364 if (ret == 0) {365 tmp = (tmp & ~mask) | val;366 ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);367 dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,368 (unsigned)val&0xff);369 }370 mutex_unlock(&lp3971->io_lock);371 372 return ret;373}374 375static int setup_regulators(struct lp3971 *lp3971,376 struct lp3971_platform_data *pdata)377{378 int i, err;379 380 /* Instantiate the regulators */381 for (i = 0; i < pdata->num_regulators; i++) {382 struct regulator_config config = { };383 struct lp3971_regulator_subdev *reg = &pdata->regulators[i];384 struct regulator_dev *rdev;385 386 config.dev = lp3971->dev;387 config.init_data = reg->initdata;388 config.driver_data = lp3971;389 390 rdev = devm_regulator_register(lp3971->dev,391 ®ulators[reg->id], &config);392 if (IS_ERR(rdev)) {393 err = PTR_ERR(rdev);394 dev_err(lp3971->dev, "regulator init failed: %d\n",395 err);396 return err;397 }398 }399 400 return 0;401}402 403static int lp3971_i2c_probe(struct i2c_client *i2c)404{405 struct lp3971 *lp3971;406 struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);407 int ret;408 u16 val;409 410 if (!pdata) {411 dev_dbg(&i2c->dev, "No platform init data supplied\n");412 return -ENODEV;413 }414 415 lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);416 if (lp3971 == NULL)417 return -ENOMEM;418 419 lp3971->i2c = i2c;420 lp3971->dev = &i2c->dev;421 422 mutex_init(&lp3971->io_lock);423 424 /* Detect LP3971 */425 ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);426 if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)427 ret = -ENODEV;428 if (ret < 0) {429 dev_err(&i2c->dev, "failed to detect device\n");430 return ret;431 }432 433 ret = setup_regulators(lp3971, pdata);434 if (ret < 0)435 return ret;436 437 i2c_set_clientdata(i2c, lp3971);438 return 0;439}440 441static const struct i2c_device_id lp3971_i2c_id[] = {442 { "lp3971" },443 { }444};445MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);446 447static struct i2c_driver lp3971_i2c_driver = {448 .driver = {449 .name = "LP3971",450 .probe_type = PROBE_PREFER_ASYNCHRONOUS,451 },452 .probe = lp3971_i2c_probe,453 .id_table = lp3971_i2c_id,454};455 456module_i2c_driver(lp3971_i2c_driver);457 458MODULE_LICENSE("GPL");459MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");460MODULE_DESCRIPTION("LP3971 PMIC driver");461