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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Regulators driver for Maxim max86494 *5 * Copyright (C) 2009-2010 Marvell International Ltd.6 * Haojian Zhuang <haojian.zhuang@marvell.com>7 */8#include <linux/kernel.h>9#include <linux/module.h>10#include <linux/err.h>11#include <linux/i2c.h>12#include <linux/platform_device.h>13#include <linux/regulator/driver.h>14#include <linux/slab.h>15#include <linux/regulator/max8649.h>16#include <linux/regmap.h>17 18#define MAX8649_DCDC_VMIN 750000 /* uV */19#define MAX8649_DCDC_VMAX 1380000 /* uV */20#define MAX8649_DCDC_STEP 10000 /* uV */21#define MAX8649_VOL_MASK 0x3f22 23/* Registers */24#define MAX8649_MODE0 0x0025#define MAX8649_MODE1 0x0126#define MAX8649_MODE2 0x0227#define MAX8649_MODE3 0x0328#define MAX8649_CONTROL 0x0429#define MAX8649_SYNC 0x0530#define MAX8649_RAMP 0x0631#define MAX8649_CHIP_ID1 0x0832#define MAX8649_CHIP_ID2 0x0933 34/* Bits */35#define MAX8649_EN_PD (1 << 7)36#define MAX8649_VID0_PD (1 << 6)37#define MAX8649_VID1_PD (1 << 5)38#define MAX8649_VID_MASK (3 << 5)39 40#define MAX8649_FORCE_PWM (1 << 7)41#define MAX8649_SYNC_EXTCLK (1 << 6)42 43#define MAX8649_EXT_MASK (3 << 6)44 45#define MAX8649_RAMP_MASK (7 << 5)46#define MAX8649_RAMP_DOWN (1 << 1)47 48struct max8649_regulator_info {49 struct device *dev;50 struct regmap *regmap;51 52 unsigned mode:2; /* bit[1:0] = VID1, VID0 */53 unsigned extclk_freq:2;54 unsigned extclk:1;55 unsigned ramp_timing:3;56 unsigned ramp_down:1;57};58 59static int max8649_enable_time(struct regulator_dev *rdev)60{61 struct max8649_regulator_info *info = rdev_get_drvdata(rdev);62 int voltage, rate, ret;63 unsigned int val;64 65 /* get voltage */66 ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);67 if (ret != 0)68 return ret;69 val &= MAX8649_VOL_MASK;70 voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);71 72 /* get rate */73 ret = regmap_read(info->regmap, MAX8649_RAMP, &val);74 if (ret != 0)75 return ret;76 ret = (val & MAX8649_RAMP_MASK) >> 5;77 rate = (32 * 1000) >> ret; /* uV/uS */78 79 return DIV_ROUND_UP(voltage, rate);80}81 82static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)83{84 struct max8649_regulator_info *info = rdev_get_drvdata(rdev);85 86 switch (mode) {87 case REGULATOR_MODE_FAST:88 regmap_update_bits(info->regmap, rdev->desc->vsel_reg,89 MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);90 break;91 case REGULATOR_MODE_NORMAL:92 regmap_update_bits(info->regmap, rdev->desc->vsel_reg,93 MAX8649_FORCE_PWM, 0);94 break;95 default:96 return -EINVAL;97 }98 return 0;99}100 101static unsigned int max8649_get_mode(struct regulator_dev *rdev)102{103 struct max8649_regulator_info *info = rdev_get_drvdata(rdev);104 unsigned int val;105 int ret;106 107 ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);108 if (ret != 0)109 return ret;110 if (val & MAX8649_FORCE_PWM)111 return REGULATOR_MODE_FAST;112 return REGULATOR_MODE_NORMAL;113}114 115static const struct regulator_ops max8649_dcdc_ops = {116 .set_voltage_sel = regulator_set_voltage_sel_regmap,117 .get_voltage_sel = regulator_get_voltage_sel_regmap,118 .list_voltage = regulator_list_voltage_linear,119 .map_voltage = regulator_map_voltage_linear,120 .enable = regulator_enable_regmap,121 .disable = regulator_disable_regmap,122 .is_enabled = regulator_is_enabled_regmap,123 .enable_time = max8649_enable_time,124 .set_mode = max8649_set_mode,125 .get_mode = max8649_get_mode,126 127};128 129static struct regulator_desc dcdc_desc = {130 .name = "max8649",131 .ops = &max8649_dcdc_ops,132 .type = REGULATOR_VOLTAGE,133 .n_voltages = 1 << 6,134 .owner = THIS_MODULE,135 .vsel_mask = MAX8649_VOL_MASK,136 .min_uV = MAX8649_DCDC_VMIN,137 .uV_step = MAX8649_DCDC_STEP,138 .enable_reg = MAX8649_CONTROL,139 .enable_mask = MAX8649_EN_PD,140 .enable_is_inverted = true,141};142 143static const struct regmap_config max8649_regmap_config = {144 .reg_bits = 8,145 .val_bits = 8,146};147 148static int max8649_regulator_probe(struct i2c_client *client)149{150 struct max8649_platform_data *pdata = dev_get_platdata(&client->dev);151 struct max8649_regulator_info *info = NULL;152 struct regulator_dev *regulator;153 struct regulator_config config = { };154 unsigned int val;155 unsigned char data;156 int ret;157 158 info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),159 GFP_KERNEL);160 if (!info)161 return -ENOMEM;162 163 info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);164 if (IS_ERR(info->regmap)) {165 ret = PTR_ERR(info->regmap);166 dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);167 return ret;168 }169 170 info->dev = &client->dev;171 i2c_set_clientdata(client, info);172 173 info->mode = pdata->mode;174 switch (info->mode) {175 case 0:176 dcdc_desc.vsel_reg = MAX8649_MODE0;177 break;178 case 1:179 dcdc_desc.vsel_reg = MAX8649_MODE1;180 break;181 case 2:182 dcdc_desc.vsel_reg = MAX8649_MODE2;183 break;184 case 3:185 dcdc_desc.vsel_reg = MAX8649_MODE3;186 break;187 default:188 break;189 }190 191 ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);192 if (ret != 0) {193 dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",194 ret);195 return ret;196 }197 dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);198 199 /* enable VID0 & VID1 */200 regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);201 202 /* enable/disable external clock synchronization */203 info->extclk = pdata->extclk;204 data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;205 regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,206 MAX8649_SYNC_EXTCLK, data);207 if (info->extclk) {208 /* set external clock frequency */209 info->extclk_freq = pdata->extclk_freq;210 regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,211 info->extclk_freq << 6);212 }213 214 if (pdata->ramp_timing) {215 info->ramp_timing = pdata->ramp_timing;216 regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,217 info->ramp_timing << 5);218 }219 220 info->ramp_down = pdata->ramp_down;221 if (info->ramp_down) {222 regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,223 MAX8649_RAMP_DOWN);224 }225 226 config.dev = &client->dev;227 config.init_data = pdata->regulator;228 config.driver_data = info;229 config.regmap = info->regmap;230 231 regulator = devm_regulator_register(&client->dev, &dcdc_desc,232 &config);233 if (IS_ERR(regulator)) {234 dev_err(info->dev, "failed to register regulator %s\n",235 dcdc_desc.name);236 return PTR_ERR(regulator);237 }238 239 return 0;240}241 242static const struct i2c_device_id max8649_id[] = {243 { "max8649" },244 { }245};246MODULE_DEVICE_TABLE(i2c, max8649_id);247 248static struct i2c_driver max8649_driver = {249 .probe = max8649_regulator_probe,250 .driver = {251 .name = "max8649",252 .probe_type = PROBE_PREFER_ASYNCHRONOUS,253 },254 .id_table = max8649_id,255};256 257static int __init max8649_init(void)258{259 return i2c_add_driver(&max8649_driver);260}261subsys_initcall(max8649_init);262 263static void __exit max8649_exit(void)264{265 i2c_del_driver(&max8649_driver);266}267module_exit(max8649_exit);268 269/* Module information */270MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");271MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");272MODULE_LICENSE("GPL");273