linux/drivers/regulator/aat2870-regulator.c
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   1/*
   2 * linux/drivers/regulator/aat2870-regulator.c
   3 *
   4 * Copyright (c) 2011, NVIDIA Corporation.
   5 * Author: Jin Park <jinyoungp@nvidia.com>
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License
   9 * version 2 as published by the Free Software Foundation.
  10 *
  11 * This program is distributed in the hope that it will be useful, but
  12 * WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 * General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19 * 02110-1301 USA
  20 */
  21
  22#include <linux/kernel.h>
  23#include <linux/init.h>
  24#include <linux/err.h>
  25#include <linux/module.h>
  26#include <linux/slab.h>
  27#include <linux/platform_device.h>
  28#include <linux/regulator/driver.h>
  29#include <linux/regulator/machine.h>
  30#include <linux/mfd/aat2870.h>
  31
  32struct aat2870_regulator {
  33        struct aat2870_data *aat2870;
  34        struct regulator_desc desc;
  35
  36        u8 enable_addr;
  37        u8 enable_shift;
  38        u8 enable_mask;
  39
  40        u8 voltage_addr;
  41        u8 voltage_shift;
  42        u8 voltage_mask;
  43};
  44
  45static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
  46                                       unsigned selector)
  47{
  48        struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
  49        struct aat2870_data *aat2870 = ri->aat2870;
  50
  51        return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
  52                               selector << ri->voltage_shift);
  53}
  54
  55static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
  56{
  57        struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
  58        struct aat2870_data *aat2870 = ri->aat2870;
  59        u8 val;
  60        int ret;
  61
  62        ret = aat2870->read(aat2870, ri->voltage_addr, &val);
  63        if (ret)
  64                return ret;
  65
  66        return (val & ri->voltage_mask) >> ri->voltage_shift;
  67}
  68
  69static int aat2870_ldo_enable(struct regulator_dev *rdev)
  70{
  71        struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
  72        struct aat2870_data *aat2870 = ri->aat2870;
  73
  74        return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
  75                               ri->enable_mask);
  76}
  77
  78static int aat2870_ldo_disable(struct regulator_dev *rdev)
  79{
  80        struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
  81        struct aat2870_data *aat2870 = ri->aat2870;
  82
  83        return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
  84}
  85
  86static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
  87{
  88        struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
  89        struct aat2870_data *aat2870 = ri->aat2870;
  90        u8 val;
  91        int ret;
  92
  93        ret = aat2870->read(aat2870, ri->enable_addr, &val);
  94        if (ret)
  95                return ret;
  96
  97        return val & ri->enable_mask ? 1 : 0;
  98}
  99
 100static struct regulator_ops aat2870_ldo_ops = {
 101        .list_voltage = regulator_list_voltage_table,
 102        .set_voltage_sel = aat2870_ldo_set_voltage_sel,
 103        .get_voltage_sel = aat2870_ldo_get_voltage_sel,
 104        .enable = aat2870_ldo_enable,
 105        .disable = aat2870_ldo_disable,
 106        .is_enabled = aat2870_ldo_is_enabled,
 107};
 108
 109static const unsigned int aat2870_ldo_voltages[] = {
 110        1200000, 1300000, 1500000, 1600000,
 111        1800000, 2000000, 2200000, 2500000,
 112        2600000, 2700000, 2800000, 2900000,
 113        3000000, 3100000, 3200000, 3300000,
 114};
 115
 116#define AAT2870_LDO(ids)                                \
 117        {                                               \
 118                .desc = {                               \
 119                        .name = #ids,                   \
 120                        .id = AAT2870_ID_##ids,         \
 121                        .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
 122                        .volt_table = aat2870_ldo_voltages, \
 123                        .ops = &aat2870_ldo_ops,        \
 124                        .type = REGULATOR_VOLTAGE,      \
 125                        .owner = THIS_MODULE,           \
 126                },                                      \
 127        }
 128
 129static struct aat2870_regulator aat2870_regulators[] = {
 130        AAT2870_LDO(LDOA),
 131        AAT2870_LDO(LDOB),
 132        AAT2870_LDO(LDOC),
 133        AAT2870_LDO(LDOD),
 134};
 135
 136static struct aat2870_regulator *aat2870_get_regulator(int id)
 137{
 138        struct aat2870_regulator *ri = NULL;
 139        int i;
 140
 141        for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
 142                ri = &aat2870_regulators[i];
 143                if (ri->desc.id == id)
 144                        break;
 145        }
 146
 147        if (i == ARRAY_SIZE(aat2870_regulators))
 148                return NULL;
 149
 150        ri->enable_addr = AAT2870_LDO_EN;
 151        ri->enable_shift = id - AAT2870_ID_LDOA;
 152        ri->enable_mask = 0x1 << ri->enable_shift;
 153
 154        ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
 155                           AAT2870_LDO_CD : AAT2870_LDO_AB;
 156        ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
 157        ri->voltage_mask = 0xF << ri->voltage_shift;
 158
 159        return ri;
 160}
 161
 162static int aat2870_regulator_probe(struct platform_device *pdev)
 163{
 164        struct aat2870_regulator *ri;
 165        struct regulator_config config = { };
 166        struct regulator_dev *rdev;
 167
 168        ri = aat2870_get_regulator(pdev->id);
 169        if (!ri) {
 170                dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
 171                return -EINVAL;
 172        }
 173        ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
 174
 175        config.dev = &pdev->dev;
 176        config.driver_data = ri;
 177        config.init_data = pdev->dev.platform_data;
 178
 179        rdev = regulator_register(&ri->desc, &config);
 180        if (IS_ERR(rdev)) {
 181                dev_err(&pdev->dev, "Failed to register regulator %s\n",
 182                        ri->desc.name);
 183                return PTR_ERR(rdev);
 184        }
 185        platform_set_drvdata(pdev, rdev);
 186
 187        return 0;
 188}
 189
 190static int __devexit aat2870_regulator_remove(struct platform_device *pdev)
 191{
 192        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 193
 194        regulator_unregister(rdev);
 195        return 0;
 196}
 197
 198static struct platform_driver aat2870_regulator_driver = {
 199        .driver = {
 200                .name   = "aat2870-regulator",
 201                .owner  = THIS_MODULE,
 202        },
 203        .probe  = aat2870_regulator_probe,
 204        .remove = __devexit_p(aat2870_regulator_remove),
 205};
 206
 207static int __init aat2870_regulator_init(void)
 208{
 209        return platform_driver_register(&aat2870_regulator_driver);
 210}
 211subsys_initcall(aat2870_regulator_init);
 212
 213static void __exit aat2870_regulator_exit(void)
 214{
 215        platform_driver_unregister(&aat2870_regulator_driver);
 216}
 217module_exit(aat2870_regulator_exit);
 218
 219MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
 220MODULE_LICENSE("GPL");
 221MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
 222MODULE_ALIAS("platform:aat2870-regulator");
 223
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