drivers/regulator/max8925-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Regulators driver for Maxim max8925
   4  *
   5  * Copyright (C) 2009 Marvell International Ltd.
   6  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/err.h>
  12 #include <linux/i2c.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regulator/driver.h>
  15 #include <linux/regulator/machine.h>
  16 #include <linux/mfd/max8925.h>
  17 #include <linux/of.h>
  18 #include <linux/regulator/of_regulator.h>
  19
  20 #define SD1_DVM_VMIN            850000
  21 #define SD1_DVM_VMAX            1000000
  22 #define SD1_DVM_STEP            50000
  23 #define SD1_DVM_SHIFT           5               /* SDCTL1 bit5 */
  24 #define SD1_DVM_EN              6               /* SDV1 bit 6 */
  25
  26 /* bit definitions in LDO control registers */
  27 #define LDO_SEQ_I2C             0x7             /* Power U/D by i2c */
  28 #define LDO_SEQ_MASK            0x7             /* Power U/D sequence mask */
  29 #define LDO_SEQ_SHIFT           2               /* Power U/D sequence offset */
  30 #define LDO_I2C_EN              0x1             /* Enable by i2c */
  31 #define LDO_I2C_EN_MASK         0x1             /* Enable mask by i2c */
  32 #define LDO_I2C_EN_SHIFT        0               /* Enable offset by i2c */
  33
  34 struct max8925_regulator_info {
  35         struct regulator_desc   desc;
  36         struct i2c_client       *i2c;
  37
  38         int     vol_reg;
  39         int     enable_reg;
  40 };
  41
  42 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
  43                                    unsigned int selector)
  44 {
  45         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  46         unsigned char mask = rdev->desc->n_voltages - 1;
  47
  48         return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
  49 }
  50
  51 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
  52 {
  53         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  54         unsigned char data, mask;
  55         int ret;
  56
  57         ret = max8925_reg_read(info->i2c, info->vol_reg);
  58         if (ret < 0)
  59                 return ret;
  60         mask = rdev->desc->n_voltages - 1;
  61         data = ret & mask;
  62
  63         return data;
  64 }
  65
  66 static int max8925_enable(struct regulator_dev *rdev)
  67 {
  68         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  69
  70         return max8925_set_bits(info->i2c, info->enable_reg,
  71                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
  72                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
  73                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
  74                                 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
  75 }
  76
  77 static int max8925_disable(struct regulator_dev *rdev)
  78 {
  79         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  80
  81         return max8925_set_bits(info->i2c, info->enable_reg,
  82                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
  83                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
  84                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
  85 }
  86
  87 static int max8925_is_enabled(struct regulator_dev *rdev)
  88 {
  89         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
  90         int ldo_seq, ret;
  91
  92         ret = max8925_reg_read(info->i2c, info->enable_reg);
  93         if (ret < 0)
  94                 return ret;
  95         ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
  96         if (ldo_seq != LDO_SEQ_I2C)
  97                 return 1;
  98         else
  99                 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
 100 }
 101
 102 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 103 {
 104         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 105         unsigned char data, mask;
 106
 107         if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 108                 return -EINVAL;
 109
 110         data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
 111         data <<= SD1_DVM_SHIFT;
 112         mask = 3 << SD1_DVM_SHIFT;
 113
 114         return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 115 }
 116
 117 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 118 {
 119         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 120
 121         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 122                                 1 << SD1_DVM_EN);
 123 }
 124
 125 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 126 {
 127         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 128
 129         return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 130 }
 131
 132 static const struct regulator_ops max8925_regulator_sdv_ops = {
 133         .map_voltage            = regulator_map_voltage_linear,
 134         .list_voltage           = regulator_list_voltage_linear,
 135         .set_voltage_sel        = max8925_set_voltage_sel,
 136         .get_voltage_sel        = max8925_get_voltage_sel,
 137         .enable                 = max8925_enable,
 138         .disable                = max8925_disable,
 139         .is_enabled             = max8925_is_enabled,
 140         .set_suspend_voltage    = max8925_set_dvm_voltage,
 141         .set_suspend_enable     = max8925_set_dvm_enable,
 142         .set_suspend_disable    = max8925_set_dvm_disable,
 143 };
 144
 145 static const struct regulator_ops max8925_regulator_ldo_ops = {
 146         .map_voltage            = regulator_map_voltage_linear,
 147         .list_voltage           = regulator_list_voltage_linear,
 148         .set_voltage_sel        = max8925_set_voltage_sel,
 149         .get_voltage_sel        = max8925_get_voltage_sel,
 150         .enable                 = max8925_enable,
 151         .disable                = max8925_disable,
 152         .is_enabled             = max8925_is_enabled,
 153 };
 154
 155 #define MAX8925_SDV(_id, min, max, step)                        \
 156 {                                                               \
 157         .desc   = {                                             \
 158                 .name   = "SDV" #_id,                           \
 159                 .of_match = of_match_ptr("SDV" #_id),           \
 160                 .regulators_node = of_match_ptr("regulators"),  \
 161                 .ops    = &max8925_regulator_sdv_ops,           \
 162                 .type   = REGULATOR_VOLTAGE,                    \
 163                 .id     = MAX8925_ID_SD##_id,                   \
 164                 .owner  = THIS_MODULE,                          \
 165                 .n_voltages = 64,                               \
 166                 .min_uV = min * 1000,                           \
 167                 .uV_step = step * 1000,                         \
 168         },                                                      \
 169         .vol_reg        = MAX8925_SDV##_id,                     \
 170         .enable_reg     = MAX8925_SDCTL##_id,                   \
 171 }
 172
 173 #define MAX8925_LDO(_id, min, max, step)                        \
 174 {                                                               \
 175         .desc   = {                                             \
 176                 .name   = "LDO" #_id,                           \
 177                 .of_match = of_match_ptr("LDO" #_id),           \
 178                 .regulators_node = of_match_ptr("regulators"),  \
 179                 .ops    = &max8925_regulator_ldo_ops,           \
 180                 .type   = REGULATOR_VOLTAGE,                    \
 181                 .id     = MAX8925_ID_LDO##_id,                  \
 182                 .owner  = THIS_MODULE,                          \
 183                 .n_voltages = 64,                               \
 184                 .min_uV = min * 1000,                           \
 185                 .uV_step = step * 1000,                         \
 186         },                                                      \
 187         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
 188         .enable_reg     = MAX8925_LDOCTL##_id,                  \
 189 }
 190
 191 static struct max8925_regulator_info max8925_regulator_info[] = {
 192         MAX8925_SDV(1, 637.5, 1425, 12.5),
 193         MAX8925_SDV(2,   650, 2225,   25),
 194         MAX8925_SDV(3,   750, 3900,   50),
 195
 196         MAX8925_LDO(1,  750, 3900, 50),
 197         MAX8925_LDO(2,  650, 2250, 25),
 198         MAX8925_LDO(3,  650, 2250, 25),
 199         MAX8925_LDO(4,  750, 3900, 50),
 200         MAX8925_LDO(5,  750, 3900, 50),
 201         MAX8925_LDO(6,  750, 3900, 50),
 202         MAX8925_LDO(7,  750, 3900, 50),
 203         MAX8925_LDO(8,  750, 3900, 50),
 204         MAX8925_LDO(9,  750, 3900, 50),
 205         MAX8925_LDO(10, 750, 3900, 50),
 206         MAX8925_LDO(11, 750, 3900, 50),
 207         MAX8925_LDO(12, 750, 3900, 50),
 208         MAX8925_LDO(13, 750, 3900, 50),
 209         MAX8925_LDO(14, 750, 3900, 50),
 210         MAX8925_LDO(15, 750, 3900, 50),
 211         MAX8925_LDO(16, 750, 3900, 50),
 212         MAX8925_LDO(17, 650, 2250, 25),
 213         MAX8925_LDO(18, 650, 2250, 25),
 214         MAX8925_LDO(19, 750, 3900, 50),
 215         MAX8925_LDO(20, 750, 3900, 50),
 216 };
 217
 218 static int max8925_regulator_probe(struct platform_device *pdev)
 219 {
 220         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 221         struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
 222         struct regulator_config config = { };
 223         struct max8925_regulator_info *ri;
 224         struct resource *res;
 225         struct regulator_dev *rdev;
 226         int i;
 227
 228         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 229         if (!res) {
 230                 dev_err(&pdev->dev, "No REG resource!\n");
 231                 return -EINVAL;
 232         }
 233         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 234                 ri = &max8925_regulator_info[i];
 235                 if (ri->vol_reg == res->start)
 236                         break;
 237         }
 238
 239         if (i == ARRAY_SIZE(max8925_regulator_info)) {
 240                 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
 241                         (unsigned long long)res->start);
 242                 return -EINVAL;
 243         }
 244         ri->i2c = chip->i2c;
 245
 246         config.dev = chip->dev;
 247         config.driver_data = ri;
 248
 249         if (pdata)
 250                 config.init_data = pdata;
 251
 252         rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 253         if (IS_ERR(rdev)) {
 254                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 255                                 ri->desc.name);
 256                 return PTR_ERR(rdev);
 257         }
 258
 259         platform_set_drvdata(pdev, rdev);
 260         return 0;
 261 }
 262
 263 static struct platform_driver max8925_regulator_driver = {
 264         .driver         = {
 265                 .name   = "max8925-regulator",
 266         },
 267         .probe          = max8925_regulator_probe,
 268 };
 269
 270 static int __init max8925_regulator_init(void)
 271 {
 272         return platform_driver_register(&max8925_regulator_driver);
 273 }
 274 subsys_initcall(max8925_regulator_init);
 275
 276 static void __exit max8925_regulator_exit(void)
 277 {
 278         platform_driver_unregister(&max8925_regulator_driver);
 279 }
 280 module_exit(max8925_regulator_exit);
 281
 282 MODULE_LICENSE("GPL");
 283 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 284 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 285 MODULE_ALIAS("platform:max8925-regulator");