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        struct regulator_dev    *rdev;
  53};
  54
  55static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
  56{
  57        struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
  58        int vsel = regulator_get_voltage_sel_regmap(rdev);
  59        int curr_uV = regulator_list_voltage_linear(rdev, vsel);
  60
  61        return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
  62}
  63
  64static struct regulator_ops rc5t583_ops = {
  65        .is_enabled             = regulator_is_enabled_regmap,
  66        .enable                 = regulator_enable_regmap,
  67        .disable                = regulator_disable_regmap,
  68        .enable_time            = rc5t583_regulator_enable_time,
  69        .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  70        .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  71        .list_voltage           = regulator_list_voltage_linear,
  72        .map_voltage            = regulator_map_voltage_linear,
  73        .set_voltage_time_sel   = regulator_set_voltage_time_sel,
  74};
  75
  76#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
  77                _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
  78{                                                               \
  79        .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
  80        .disc_bit       = _disc_bit,                            \
  81        .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
  82        .enable_uv_per_us = _enable_mv * 1000,                  \
  83        .deepsleep_id   = RC5T583_DS_##_id,                     \
  84        .desc = {                                               \
  85                .name = "rc5t583-regulator-"#_id,               \
  86                .id = RC5T583_REGULATOR_##_id,                  \
  87                .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
  88                .ops = &rc5t583_ops,                            \
  89                .type = REGULATOR_VOLTAGE,                      \
  90                .owner = THIS_MODULE,                           \
  91                .vsel_reg = RC5T583_REG_##_id##DAC,             \
  92                .vsel_mask = _vout_mask,                        \
  93                .enable_reg = RC5T583_REG_##_en_reg,            \
  94                .enable_mask = BIT(_en_bit),                    \
  95                .min_uV = _min_mv * 1000,                       \
  96                .uV_step = _step_uV,                            \
  97                .ramp_delay = 40 * 1000,                        \
  98        },                                                      \
  99}
 100
 101static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
 102        RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
 103        RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
 104        RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
 105        RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
 106        RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
 107        RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
 108        RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
 109        RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
 110        RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
 111        RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
 112        RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
 113        RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
 114        RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
 115        RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
 116};
 117
 118static int rc5t583_regulator_probe(struct platform_device *pdev)
 119{
 120        struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
 121        struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
 122        struct regulator_init_data *reg_data;
 123        struct regulator_config config = { };
 124        struct rc5t583_regulator *reg = NULL;
 125        struct rc5t583_regulator *regs;
 126        struct regulator_dev *rdev;
 127        struct rc5t583_regulator_info *ri;
 128        int ret;
 129        int id;
 130
 131        if (!pdata) {
 132                dev_err(&pdev->dev, "No platform data, exiting...\n");
 133                return -ENODEV;
 134        }
 135
 136        regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
 137                        sizeof(struct rc5t583_regulator), GFP_KERNEL);
 138        if (!regs) {
 139                dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 140                return -ENOMEM;
 141        }
 142
 143
 144        for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
 145                reg_data = pdata->reg_init_data[id];
 146
 147                /* No need to register if there is no regulator data */
 148                if (!reg_data)
 149                        continue;
 150
 151                reg = &regs[id];
 152                ri = &rc5t583_reg_info[id];
 153                reg->reg_info = ri;
 154
 155                if (ri->deepsleep_id == RC5T583_DS_NONE)
 156                        goto skip_ext_pwr_config;
 157
 158                ret = rc5t583_ext_power_req_config(rc5t583->dev,
 159                                ri->deepsleep_id,
 160                                pdata->regulator_ext_pwr_control[id],
 161                                pdata->regulator_deepsleep_slot[id]);
 162                /*
 163                 * Configuring external control is not a major issue,
 164                 * just give warning.
 165                 */
 166                if (ret < 0)
 167                        dev_warn(&pdev->dev,
 168                                "Failed to configure ext control %d\n", id);
 169
 170skip_ext_pwr_config:
 171                config.dev = &pdev->dev;
 172                config.init_data = reg_data;
 173                config.driver_data = reg;
 174                config.regmap = rc5t583->regmap;
 175
 176                rdev = regulator_register(&ri->desc, &config);
 177                if (IS_ERR(rdev)) {
 178                        dev_err(&pdev->dev, "Failed to register regulator %s\n",
 179                                                ri->desc.name);
 180                        ret = PTR_ERR(rdev);
 181                        goto clean_exit;
 182                }
 183                reg->rdev = rdev;
 184        }
 185        platform_set_drvdata(pdev, regs);
 186        return 0;
 187
 188clean_exit:
 189        while (--id >= 0)
 190                regulator_unregister(regs[id].rdev);
 191
 192        return ret;
 193}
 194
 195static int rc5t583_regulator_remove(struct platform_device *pdev)
 196{
 197        struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
 198        int id;
 199
 200        for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
 201                regulator_unregister(regs[id].rdev);
 202        return 0;
 203}
 204
 205static struct platform_driver rc5t583_regulator_driver = {
 206        .driver = {
 207                .name   = "rc5t583-regulator",
 208                .owner  = THIS_MODULE,
 209        },
 210        .probe          = rc5t583_regulator_probe,
 211        .remove         = rc5t583_regulator_remove,
 212};
 213
 214static int __init rc5t583_regulator_init(void)
 215{
 216        return platform_driver_register(&rc5t583_regulator_driver);
 217}
 218subsys_initcall(rc5t583_regulator_init);
 219
 220static void __exit rc5t583_regulator_exit(void)
 221{
 222        platform_driver_unregister(&rc5t583_regulator_driver);
 223}
 224module_exit(rc5t583_regulator_exit);
 225
 226MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 227MODULE_DESCRIPTION("RC5T583 regulator driver");
 228MODULE_ALIAS("platform:rc5t583-regulator");
 229MODULE_LICENSE("GPL v2");
 230
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