linux/drivers/regulator/rc5t583-regulator.c
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   1/*
   2 * Regulator driver for RICOH RC5T583 power management chip.
   3 *
   4 * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
   5 * Author: Laxman dewangan <ldewangan@nvidia.com>
   6 *
   7 * based on code
   8 *      Copyright (C) 2011 RICOH COMPANY,LTD
   9 *
  10 *
  11 * This program is free software; you can redistribute it and/or modify it
  12 * under the terms and conditions of the GNU General Public License,
  13 * version 2, as published by the Free Software Foundation.
  14 *
  15 * This program is distributed in the hope it will be useful, but WITHOUT
  16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  18 * more details.
  19 *
  20 * You should have received a copy of the GNU General Public License
  21 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 *
  23 */
  24
  25#include <linux/module.h>
  26#include <linux/init.h>
  27#include <linux/slab.h>
  28#include <linux/err.h>
  29#include <linux/platform_device.h>
  30#include <linux/regulator/driver.h>
  31#include <linux/regulator/machine.h>
  32#include <linux/gpio.h>
  33#include <linux/mfd/rc5t583.h>
  34
  35struct rc5t583_regulator_info {
  36        int                     deepsleep_id;
  37
  38        /* Regulator register address.*/
  39        uint8_t                 reg_disc_reg;
  40        uint8_t                 disc_bit;
  41        uint8_t                 deepsleep_reg;
  42
  43        /* Regulator specific turn-on delay  and voltage settling time*/
  44        int                     enable_uv_per_us;
  45
  46        /* Used by regulator core */
  47        struct regulator_desc   desc;
  48};
  49
  50struct rc5t583_regulator {
  51        struct rc5t583_regulator_info *reg_info;
  52
  53        /* Devices */
  54        struct device           *dev;
  55        struct rc5t583          *mfd;
  56        struct regulator_dev    *rdev;
  57};
  58
  59static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
  60{
  61        struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
  62        int vsel = regulator_get_voltage_sel_regmap(rdev);
  63        int curr_uV = regulator_list_voltage_linear(rdev, vsel);
  64
  65        return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
  66}
  67
  68static struct regulator_ops rc5t583_ops = {
  69        .is_enabled             = regulator_is_enabled_regmap,
  70        .enable                 = regulator_enable_regmap,
  71        .disable                = regulator_disable_regmap,
  72        .enable_time            = rc5t583_regulator_enable_time,
  73        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  74        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  75        .list_voltage           = regulator_list_voltage_linear,
  76        .map_voltage            = regulator_map_voltage_linear,
  77        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
  78};
  79
  80#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
  81                _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
  82{                                                               \
  83        .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
  84        .disc_bit       = _disc_bit,                            \
  85        .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
  86        .enable_uv_per_us = _enable_mv * 1000,                  \
  87        .deepsleep_id   = RC5T583_DS_##_id,                     \
  88        .desc = {                                               \
  89                .name = "rc5t583-regulator-"#_id,               \
  90                .id = RC5T583_REGULATOR_##_id,                  \
  91                .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
  92                .ops = &rc5t583_ops,                            \
  93                .type = REGULATOR_VOLTAGE,                      \
  94                .owner = THIS_MODULE,                           \
  95                .vsel_reg = RC5T583_REG_##_id##DAC,             \
  96                .vsel_mask = _vout_mask,                        \
  97                .enable_reg = RC5T583_REG_##_en_reg,            \
  98                .enable_mask = BIT(_en_bit),                    \
  99                .min_uV = _min_mv * 1000,                       \
 100                .uV_step = _step_uV,                            \
 101                .ramp_delay = 40 * 1000,                        \
 102        },                                                      \
 103}
 104
 105static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
 106        RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
 107        RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
 108        RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
 109        RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
 110        RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
 111        RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
 112        RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
 113        RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
 114        RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
 115        RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
 116        RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
 117        RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
 118        RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
 119        RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
 120};
 121
 122static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
 123{
 124        struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
 125        struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
 126        struct regulator_init_data *reg_data;
 127        struct regulator_config config = { };
 128        struct rc5t583_regulator *reg = NULL;
 129        struct rc5t583_regulator *regs;
 130        struct regulator_dev *rdev;
 131        struct rc5t583_regulator_info *ri;
 132        int ret;
 133        int id;
 134
 135        if (!pdata) {
 136                dev_err(&pdev->dev, "No platform data, exiting...\n");
 137                return -ENODEV;
 138        }
 139
 140        regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
 141                        sizeof(struct rc5t583_regulator), GFP_KERNEL);
 142        if (!regs) {
 143                dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 144                return -ENOMEM;
 145        }
 146
 147
 148        for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
 149                reg_data = pdata->reg_init_data[id];
 150
 151                /* No need to register if there is no regulator data */
 152                if (!reg_data)
 153                        continue;
 154
 155                reg = &regs[id];
 156                ri = &rc5t583_reg_info[id];
 157                reg->reg_info = ri;
 158                reg->mfd = rc5t583;
 159                reg->dev = &pdev->dev;
 160
 161                if (ri->deepsleep_id == RC5T583_DS_NONE)
 162                        goto skip_ext_pwr_config;
 163
 164                ret = rc5t583_ext_power_req_config(rc5t583->dev,
 165                                ri->deepsleep_id,
 166                                pdata->regulator_ext_pwr_control[id],
 167                                pdata->regulator_deepsleep_slot[id]);
 168                /*
 169                 * Configuring external control is not a major issue,
 170                 * just give warning.
 171                 */
 172                if (ret < 0)
 173                        dev_warn(&pdev->dev,
 174                                "Failed to configure ext control %d\n", id);
 175
 176skip_ext_pwr_config:
 177                config.dev = &pdev->dev;
 178                config.init_data = reg_data;
 179                config.driver_data = reg;
 180                config.regmap = rc5t583->regmap;
 181
 182                rdev = regulator_register(&ri->desc, &config);
 183                if (IS_ERR(rdev)) {
 184                        dev_err(&pdev->dev, "Failed to register regulator %s\n",
 185                                                ri->desc.name);
 186                        ret = PTR_ERR(rdev);
 187                        goto clean_exit;
 188                }
 189                reg->rdev = rdev;
 190        }
 191        platform_set_drvdata(pdev, regs);
 192        return 0;
 193
 194clean_exit:
 195        while (--id >= 0)
 196                regulator_unregister(regs[id].rdev);
 197
 198        return ret;
 199}
 200
 201static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
 202{
 203        struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
 204        int id;
 205
 206        for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
 207                regulator_unregister(regs[id].rdev);
 208        return 0;
 209}
 210
 211static struct platform_driver rc5t583_regulator_driver = {
 212        .driver = {
 213                .name   = "rc5t583-regulator",
 214                .owner  = THIS_MODULE,
 215        },
 216        .probe          = rc5t583_regulator_probe,
 217        .remove         = __devexit_p(rc5t583_regulator_remove),
 218};
 219
 220static int __init rc5t583_regulator_init(void)
 221{
 222        return platform_driver_register(&rc5t583_regulator_driver);
 223}
 224subsys_initcall(rc5t583_regulator_init);
 225
 226static void __exit rc5t583_regulator_exit(void)
 227{
 228        platform_driver_unregister(&rc5t583_regulator_driver);
 229}
 230module_exit(rc5t583_regulator_exit);
 231
 232MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 233MODULE_DESCRIPTION("RC5T583 regulator driver");
 234MODULE_ALIAS("platform:rc5t583-regulator");
 235MODULE_LICENSE("GPL v2");
 236
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