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1// SPDX-License-Identifier: GPL-2.0+2//3// wm8994-regulator.c -- Regulator driver for the WM89944//5// Copyright 2009 Wolfson Microelectronics PLC.6//7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>8 9#include <linux/module.h>10#include <linux/moduleparam.h>11#include <linux/init.h>12#include <linux/bitops.h>13#include <linux/err.h>14#include <linux/platform_device.h>15#include <linux/regulator/driver.h>16#include <linux/regulator/machine.h>17#include <linux/gpio/consumer.h>18#include <linux/slab.h>19 20#include <linux/mfd/wm8994/core.h>21#include <linux/mfd/wm8994/registers.h>22#include <linux/mfd/wm8994/pdata.h>23 24struct wm8994_ldo {25 struct regulator_dev *regulator;26 struct wm8994 *wm8994;27 struct regulator_consumer_supply supply;28 struct regulator_init_data init_data;29};30 31#define WM8994_LDO1_MAX_SELECTOR 0x732#define WM8994_LDO2_MAX_SELECTOR 0x333 34static const struct regulator_ops wm8994_ldo1_ops = {35 .list_voltage = regulator_list_voltage_linear,36 .map_voltage = regulator_map_voltage_linear,37 .get_voltage_sel = regulator_get_voltage_sel_regmap,38 .set_voltage_sel = regulator_set_voltage_sel_regmap,39};40 41static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,42 unsigned int selector)43{44 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);45 46 if (selector > WM8994_LDO2_MAX_SELECTOR)47 return -EINVAL;48 49 switch (ldo->wm8994->type) {50 case WM8994:51 return (selector * 100000) + 900000;52 case WM8958:53 return (selector * 100000) + 1000000;54 case WM1811:55 switch (selector) {56 case 0:57 return -EINVAL;58 default:59 return (selector * 100000) + 950000;60 }61 break;62 default:63 return -EINVAL;64 }65}66 67static const struct regulator_ops wm8994_ldo2_ops = {68 .list_voltage = wm8994_ldo2_list_voltage,69 .get_voltage_sel = regulator_get_voltage_sel_regmap,70 .set_voltage_sel = regulator_set_voltage_sel_regmap,71};72 73static const struct regulator_desc wm8994_ldo_desc[] = {74 {75 .name = "LDO1",76 .id = 1,77 .type = REGULATOR_VOLTAGE,78 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,79 .vsel_reg = WM8994_LDO_1,80 .vsel_mask = WM8994_LDO1_VSEL_MASK,81 .ops = &wm8994_ldo1_ops,82 .min_uV = 2400000,83 .uV_step = 100000,84 .enable_time = 3000,85 .off_on_delay = 36000,86 .owner = THIS_MODULE,87 },88 {89 .name = "LDO2",90 .id = 2,91 .type = REGULATOR_VOLTAGE,92 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,93 .vsel_reg = WM8994_LDO_2,94 .vsel_mask = WM8994_LDO2_VSEL_MASK,95 .ops = &wm8994_ldo2_ops,96 .enable_time = 3000,97 .off_on_delay = 36000,98 .owner = THIS_MODULE,99 },100};101 102static const struct regulator_desc wm8958_ldo_desc[] = {103 {104 .name = "LDO1",105 .id = 1,106 .type = REGULATOR_VOLTAGE,107 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,108 .vsel_reg = WM8994_LDO_1,109 .vsel_mask = WM8994_LDO1_VSEL_MASK,110 .ops = &wm8994_ldo1_ops,111 .min_uV = 2400000,112 .uV_step = 100000,113 .enable_time = 3000,114 .owner = THIS_MODULE,115 },116 {117 .name = "LDO2",118 .id = 2,119 .type = REGULATOR_VOLTAGE,120 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,121 .vsel_reg = WM8994_LDO_2,122 .vsel_mask = WM8994_LDO2_VSEL_MASK,123 .ops = &wm8994_ldo2_ops,124 .enable_time = 3000,125 .owner = THIS_MODULE,126 },127};128 129static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {130 { .supply = "AVDD1" },131 { .supply = "DCVDD" },132};133 134static const struct regulator_init_data wm8994_ldo_default[] = {135 {136 .constraints = {137 .valid_ops_mask = REGULATOR_CHANGE_STATUS,138 },139 .num_consumer_supplies = 1,140 },141 {142 .constraints = {143 .valid_ops_mask = REGULATOR_CHANGE_STATUS,144 },145 .num_consumer_supplies = 1,146 },147};148 149static int wm8994_ldo_probe(struct platform_device *pdev)150{151 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);152 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);153 int id = pdev->id % ARRAY_SIZE(pdata->ldo);154 struct regulator_config config = { };155 struct wm8994_ldo *ldo;156 struct gpio_desc *gpiod;157 int ret;158 159 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);160 161 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);162 if (!ldo)163 return -ENOMEM;164 165 ldo->wm8994 = wm8994;166 ldo->supply = wm8994_ldo_consumer[id];167 ldo->supply.dev_name = dev_name(wm8994->dev);168 169 config.dev = wm8994->dev;170 config.driver_data = ldo;171 config.regmap = wm8994->regmap;172 config.init_data = &ldo->init_data;173 174 /*175 * Look up LDO enable GPIO from the parent device node, we don't176 * use devm because the regulator core will free the GPIO177 */178 gpiod = gpiod_get_optional(pdev->dev.parent,179 id ? "wlf,ldo2ena" : "wlf,ldo1ena",180 GPIOD_OUT_LOW |181 GPIOD_FLAGS_BIT_NONEXCLUSIVE);182 if (IS_ERR(gpiod))183 return PTR_ERR(gpiod);184 config.ena_gpiod = gpiod;185 186 /* Use default constraints if none set up */187 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {188 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",189 ldo->supply.dev_name, ldo->supply.supply);190 191 ldo->init_data = wm8994_ldo_default[id];192 ldo->init_data.consumer_supplies = &ldo->supply;193 if (!gpiod)194 ldo->init_data.constraints.valid_ops_mask = 0;195 } else {196 ldo->init_data = *pdata->ldo[id].init_data;197 }198 199 /*200 * At this point the GPIO descriptor is handled over to the201 * regulator core and we need not worry about it on the202 * error path.203 */204 if (ldo->wm8994->type == WM8994) {205 ldo->regulator = devm_regulator_register(&pdev->dev,206 &wm8994_ldo_desc[id],207 &config);208 } else {209 ldo->regulator = devm_regulator_register(&pdev->dev,210 &wm8958_ldo_desc[id],211 &config);212 }213 214 if (IS_ERR(ldo->regulator)) {215 ret = PTR_ERR(ldo->regulator);216 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",217 id + 1, ret);218 return ret;219 }220 221 platform_set_drvdata(pdev, ldo);222 223 return 0;224}225 226static struct platform_driver wm8994_ldo_driver = {227 .probe = wm8994_ldo_probe,228 .driver = {229 .name = "wm8994-ldo",230 .probe_type = PROBE_FORCE_SYNCHRONOUS,231 },232};233 234module_platform_driver(wm8994_ldo_driver);235 236/* Module information */237MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");238MODULE_DESCRIPTION("WM8994 LDO driver");239MODULE_LICENSE("GPL");240MODULE_ALIAS("platform:wm8994-ldo");241