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1/*2 * TI TPS65132 Regulator driver3 *4 * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.5 *6 * Author: Venkat Reddy Talla <vreddytalla@nvidia.com>7 * Laxman Dewangan <ldewangan@nvidia.com>8 *9 * This program is free software; you can redistribute it and/or10 * modify it under the terms of the GNU General Public License as11 * published by the Free Software Foundation; either version 2 of the12 * License, or (at your option) any later version.13 *14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,15 * whether express or implied; without even the implied warranty of16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU17 * General Public License for more details.18 */19 20#include <linux/delay.h>21#include <linux/err.h>22#include <linux/gpio/consumer.h>23#include <linux/i2c.h>24#include <linux/module.h>25#include <linux/regmap.h>26#include <linux/regulator/driver.h>27#include <linux/regulator/machine.h>28 29#define TPS65132_REG_VPOS 0x0030#define TPS65132_REG_VNEG 0x0131#define TPS65132_REG_APPS_DISP_DISN 0x0332#define TPS65132_REG_CONTROL 0x0FF33 34#define TPS65132_VOUT_MASK 0x1F35#define TPS65132_VOUT_N_VOLTAGE 0x1536#define TPS65132_VOUT_VMIN 400000037#define TPS65132_VOUT_VMAX 600000038#define TPS65132_VOUT_STEP 10000039 40#define TPS65132_REG_APPS_DIS_VPOS BIT(0)41#define TPS65132_REG_APPS_DIS_VNEG BIT(1)42 43#define TPS65132_REGULATOR_ID_VPOS 044#define TPS65132_REGULATOR_ID_VNEG 145#define TPS65132_MAX_REGULATORS 246 47#define TPS65132_ACT_DIS_TIME_SLACK 100048 49struct tps65132_reg_pdata {50 struct gpio_desc *en_gpiod;51 struct gpio_desc *act_dis_gpiod;52 unsigned int act_dis_time_us;53 int ena_gpio_state;54};55 56struct tps65132_regulator {57 struct device *dev;58 struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];59};60 61static int tps65132_regulator_enable(struct regulator_dev *rdev)62{63 struct tps65132_regulator *tps = rdev_get_drvdata(rdev);64 int id = rdev_get_id(rdev);65 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];66 int ret;67 68 if (!IS_ERR(rpdata->en_gpiod)) {69 gpiod_set_value_cansleep(rpdata->en_gpiod, 1);70 rpdata->ena_gpio_state = 1;71 }72 73 /* Hardware automatically enable discharge bit in enable */74 if (rdev->constraints->active_discharge ==75 REGULATOR_ACTIVE_DISCHARGE_DISABLE) {76 ret = regulator_set_active_discharge_regmap(rdev, false);77 if (ret < 0) {78 dev_err(tps->dev, "Failed to disable active discharge: %d\n",79 ret);80 return ret;81 }82 }83 84 return 0;85}86 87static int tps65132_regulator_disable(struct regulator_dev *rdev)88{89 struct tps65132_regulator *tps = rdev_get_drvdata(rdev);90 int id = rdev_get_id(rdev);91 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];92 93 if (!IS_ERR(rpdata->en_gpiod)) {94 gpiod_set_value_cansleep(rpdata->en_gpiod, 0);95 rpdata->ena_gpio_state = 0;96 }97 98 if (!IS_ERR(rpdata->act_dis_gpiod)) {99 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);100 usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +101 TPS65132_ACT_DIS_TIME_SLACK);102 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);103 }104 105 return 0;106}107 108static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)109{110 struct tps65132_regulator *tps = rdev_get_drvdata(rdev);111 int id = rdev_get_id(rdev);112 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];113 114 if (!IS_ERR(rpdata->en_gpiod))115 return rpdata->ena_gpio_state;116 117 return 1;118}119 120static const struct regulator_ops tps65132_regulator_ops = {121 .enable = tps65132_regulator_enable,122 .disable = tps65132_regulator_disable,123 .is_enabled = tps65132_regulator_is_enabled,124 .list_voltage = regulator_list_voltage_linear,125 .map_voltage = regulator_map_voltage_linear,126 .get_voltage_sel = regulator_get_voltage_sel_regmap,127 .set_voltage_sel = regulator_set_voltage_sel_regmap,128 .set_active_discharge = regulator_set_active_discharge_regmap,129};130 131static int tps65132_of_parse_cb(struct device_node *np,132 const struct regulator_desc *desc,133 struct regulator_config *config)134{135 struct tps65132_regulator *tps = config->driver_data;136 struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];137 int ret;138 139 rpdata->en_gpiod = devm_fwnode_gpiod_get(tps->dev, of_fwnode_handle(np),140 "enable", GPIOD_ASIS,141 "enable");142 if (IS_ERR(rpdata->en_gpiod)) {143 ret = PTR_ERR(rpdata->en_gpiod);144 145 /* Ignore the error other than probe defer */146 if (ret == -EPROBE_DEFER)147 return ret;148 return 0;149 }150 151 rpdata->act_dis_gpiod = devm_fwnode_gpiod_get(tps->dev,152 of_fwnode_handle(np),153 "active-discharge",154 GPIOD_ASIS,155 "active-discharge");156 if (IS_ERR(rpdata->act_dis_gpiod)) {157 ret = PTR_ERR(rpdata->act_dis_gpiod);158 159 /* Ignore the error other than probe defer */160 if (ret == -EPROBE_DEFER)161 return ret;162 163 return 0;164 }165 166 ret = of_property_read_u32(np, "ti,active-discharge-time-us",167 &rpdata->act_dis_time_us);168 if (ret < 0) {169 dev_err(tps->dev, "Failed to read active discharge time:%d\n",170 ret);171 return ret;172 }173 174 return 0;175}176 177#define TPS65132_REGULATOR_DESC(_id, _name) \178 [TPS65132_REGULATOR_ID_##_id] = { \179 .name = "tps65132-"#_name, \180 .supply_name = "vin", \181 .id = TPS65132_REGULATOR_ID_##_id, \182 .of_match = of_match_ptr(#_name), \183 .of_parse_cb = tps65132_of_parse_cb, \184 .ops = &tps65132_regulator_ops, \185 .n_voltages = TPS65132_VOUT_N_VOLTAGE, \186 .min_uV = TPS65132_VOUT_VMIN, \187 .uV_step = TPS65132_VOUT_STEP, \188 .enable_time = 500, \189 .vsel_mask = TPS65132_VOUT_MASK, \190 .vsel_reg = TPS65132_REG_##_id, \191 .active_discharge_off = 0, \192 .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \193 .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \194 .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \195 .type = REGULATOR_VOLTAGE, \196 .owner = THIS_MODULE, \197 }198 199static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {200 TPS65132_REGULATOR_DESC(VPOS, outp),201 TPS65132_REGULATOR_DESC(VNEG, outn),202};203 204static const struct regmap_range tps65132_no_reg_ranges[] = {205 regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,206 TPS65132_REG_CONTROL - 1),207};208 209static const struct regmap_access_table tps65132_no_reg_table = {210 .no_ranges = tps65132_no_reg_ranges,211 .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),212};213 214static const struct regmap_config tps65132_regmap_config = {215 .reg_bits = 8,216 .val_bits = 8,217 .max_register = TPS65132_REG_CONTROL,218 .cache_type = REGCACHE_NONE,219 .rd_table = &tps65132_no_reg_table,220 .wr_table = &tps65132_no_reg_table,221};222 223static int tps65132_probe(struct i2c_client *client)224{225 struct device *dev = &client->dev;226 struct tps65132_regulator *tps;227 struct regulator_dev *rdev;228 struct regmap *rmap;229 struct regulator_config config = { };230 int id;231 int ret;232 233 tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);234 if (!tps)235 return -ENOMEM;236 237 rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);238 if (IS_ERR(rmap)) {239 ret = PTR_ERR(rmap);240 dev_err(dev, "regmap init failed: %d\n", ret);241 return ret;242 }243 244 i2c_set_clientdata(client, tps);245 tps->dev = dev;246 247 for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {248 config.regmap = rmap;249 config.dev = dev;250 config.driver_data = tps;251 252 rdev = devm_regulator_register(dev, &tps_regs_desc[id],253 &config);254 if (IS_ERR(rdev)) {255 ret = PTR_ERR(rdev);256 dev_err(dev, "regulator %s register failed: %d\n",257 tps_regs_desc[id].name, ret);258 return ret;259 }260 }261 return 0;262}263 264static const struct i2c_device_id tps65132_id[] = {265 {.name = "tps65132",},266 {},267};268MODULE_DEVICE_TABLE(i2c, tps65132_id);269 270static const struct of_device_id __maybe_unused tps65132_of_match[] = {271 { .compatible = "ti,tps65132" },272 {},273};274MODULE_DEVICE_TABLE(of, tps65132_of_match);275 276static struct i2c_driver tps65132_i2c_driver = {277 .driver = {278 .name = "tps65132",279 .probe_type = PROBE_PREFER_ASYNCHRONOUS,280 .of_match_table = of_match_ptr(tps65132_of_match),281 },282 .probe = tps65132_probe,283 .id_table = tps65132_id,284};285 286module_i2c_driver(tps65132_i2c_driver);287 288MODULE_DESCRIPTION("tps65132 regulator driver");289MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");290MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");291MODULE_LICENSE("GPL v2");292