drivers/regulator/rc5t583-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Regulator driver for RICOH RC5T583 power management chip.
   4  *
   5  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
   6  * Author: Laxman dewangan <ldewangan@nvidia.com>
   7  *
   8  * based on code
   9  *      Copyright (C) 2011 RICOH COMPANY,LTD
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/slab.h>
  15 #include <linux/err.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regulator/driver.h>
  18 #include <linux/regulator/machine.h>
  19 #include <linux/mfd/rc5t583.h>
  20
  21 struct rc5t583_regulator_info {
  22         int                     deepsleep_id;
  23
  24         /* Regulator register address.*/
  25         uint8_t                 reg_disc_reg;
  26         uint8_t                 disc_bit;
  27         uint8_t                 deepsleep_reg;
  28
  29         /* Regulator specific turn-on delay  and voltage settling time*/
  30         int                     enable_uv_per_us;
  31
  32         /* Used by regulator core */
  33         struct regulator_desc   desc;
  34 };
  35
  36 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
  37 {
  38         struct rc5t583_regulator_info *reg_info = rdev_get_drvdata(rdev);
  39         int vsel = regulator_get_voltage_sel_regmap(rdev);
  40         int curr_uV = regulator_list_voltage_linear(rdev, vsel);
  41
  42         return DIV_ROUND_UP(curr_uV, reg_info->enable_uv_per_us);
  43 }
  44
  45 static const struct regulator_ops rc5t583_ops = {
  46         .is_enabled             = regulator_is_enabled_regmap,
  47         .enable                 = regulator_enable_regmap,
  48         .disable                = regulator_disable_regmap,
  49         .enable_time            = rc5t583_regulator_enable_time,
  50         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  51         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  52         .list_voltage           = regulator_list_voltage_linear,
  53         .map_voltage            = regulator_map_voltage_linear,
  54         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
  55 };
  56
  57 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
  58                 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
  59 {                                                               \
  60         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
  61         .disc_bit       = _disc_bit,                            \
  62         .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
  63         .enable_uv_per_us = _enable_mv * 1000,                  \
  64         .deepsleep_id   = RC5T583_DS_##_id,                     \
  65         .desc = {                                               \
  66                 .name = "rc5t583-regulator-"#_id,               \
  67                 .id = RC5T583_REGULATOR_##_id,                  \
  68                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
  69                 .ops = &rc5t583_ops,                            \
  70                 .type = REGULATOR_VOLTAGE,                      \
  71                 .owner = THIS_MODULE,                           \
  72                 .vsel_reg = RC5T583_REG_##_id##DAC,             \
  73                 .vsel_mask = _vout_mask,                        \
  74                 .enable_reg = RC5T583_REG_##_en_reg,            \
  75                 .enable_mask = BIT(_en_bit),                    \
  76                 .min_uV = _min_mv * 1000,                       \
  77                 .uV_step = _step_uV,                            \
  78                 .ramp_delay = 40 * 1000,                        \
  79         },                                                      \
  80 }
  81
  82 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
  83         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
  84         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
  85         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
  86         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
  87         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
  88         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
  89         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
  90         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
  91         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
  92         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
  93         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
  94         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
  95         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
  96         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
  97 };
  98
  99 static int rc5t583_regulator_probe(struct platform_device *pdev)
 100 {
 101         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
 102         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
 103         struct regulator_config config = { };
 104         struct regulator_dev *rdev;
 105         struct rc5t583_regulator_info *ri;
 106         int ret;
 107         int id;
 108
 109         if (!pdata) {
 110                 dev_err(&pdev->dev, "No platform data, exiting...\n");
 111                 return -ENODEV;
 112         }
 113
 114         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
 115                 ri = &rc5t583_reg_info[id];
 116
 117                 if (ri->deepsleep_id == RC5T583_DS_NONE)
 118                         goto skip_ext_pwr_config;
 119
 120                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
 121                                 ri->deepsleep_id,
 122                                 pdata->regulator_ext_pwr_control[id],
 123                                 pdata->regulator_deepsleep_slot[id]);
 124                 /*
 125                  * Configuring external control is not a major issue,
 126                  * just give warning.
 127                  */
 128                 if (ret < 0)
 129                         dev_warn(&pdev->dev,
 130                                 "Failed to configure ext control %d\n", id);
 131
 132 skip_ext_pwr_config:
 133                 config.dev = &pdev->dev;
 134                 config.init_data = pdata->reg_init_data[id];
 135                 config.driver_data = ri;
 136                 config.regmap = rc5t583->regmap;
 137
 138                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 139                 if (IS_ERR(rdev)) {
 140                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 141                                                 ri->desc.name);
 142                         return PTR_ERR(rdev);
 143                 }
 144         }
 145         return 0;
 146 }
 147
 148 static struct platform_driver rc5t583_regulator_driver = {
 149         .driver = {
 150                 .name   = "rc5t583-regulator",
 151                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 152         },
 153         .probe          = rc5t583_regulator_probe,
 154 };
 155
 156 static int __init rc5t583_regulator_init(void)
 157 {
 158         return platform_driver_register(&rc5t583_regulator_driver);
 159 }
 160 subsys_initcall(rc5t583_regulator_init);
 161
 162 static void __exit rc5t583_regulator_exit(void)
 163 {
 164         platform_driver_unregister(&rc5t583_regulator_driver);
 165 }
 166 module_exit(rc5t583_regulator_exit);
 167
 168 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 169 MODULE_DESCRIPTION("RC5T583 regulator driver");
 170 MODULE_ALIAS("platform:rc5t583-regulator");
 171 MODULE_LICENSE("GPL v2");