linux/drivers/regulator/pcap-regulator.c
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   1/*
   2 * PCAP2 Regulator Driver
   3 *
   4 * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
   5 *
   6 * This program is free software; you can redistribute  it and/or modify it
   7 * under  the terms of  the GNU General  Public License as published by the
   8 * Free Software Foundation;  either version 2 of the  License, or (at your
   9 * option) any later version.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/module.h>
  14#include <linux/init.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/ezx-pcap.h>
  20
  21static const unsigned int V1_table[] = {
  22        2775000, 1275000, 1600000, 1725000, 1825000, 1925000, 2075000, 2275000,
  23};
  24
  25static const unsigned int V2_table[] = {
  26        2500000, 2775000,
  27};
  28
  29static const unsigned int V3_table[] = {
  30        1075000, 1275000, 1550000, 1725000, 1876000, 1950000, 2075000, 2275000,
  31};
  32
  33static const unsigned int V4_table[] = {
  34        1275000, 1550000, 1725000, 1875000, 1950000, 2075000, 2275000, 2775000,
  35};
  36
  37static const unsigned int V5_table[] = {
  38        1875000, 2275000, 2475000, 2775000,
  39};
  40
  41static const unsigned int V6_table[] = {
  42        2475000, 2775000,
  43};
  44
  45static const unsigned int V7_table[] = {
  46        1875000, 2775000,
  47};
  48
  49#define V8_table V4_table
  50
  51static const unsigned int V9_table[] = {
  52        1575000, 1875000, 2475000, 2775000,
  53};
  54
  55static const unsigned int V10_table[] = {
  56        5000000,
  57};
  58
  59static const unsigned int VAUX1_table[] = {
  60        1875000, 2475000, 2775000, 3000000,
  61};
  62
  63#define VAUX2_table VAUX1_table
  64
  65static const unsigned int VAUX3_table[] = {
  66        1200000, 1200000, 1200000, 1200000, 1400000, 1600000, 1800000, 2000000,
  67        2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, 3600000,
  68};
  69
  70static const unsigned int VAUX4_table[] = {
  71        1800000, 1800000, 3000000, 5000000,
  72};
  73
  74static const unsigned int VSIM_table[] = {
  75        1875000, 3000000,
  76};
  77
  78static const unsigned int VSIM2_table[] = {
  79        1875000,
  80};
  81
  82static const unsigned int VVIB_table[] = {
  83        1300000, 1800000, 2000000, 3000000,
  84};
  85
  86static const unsigned int SW1_table[] = {
  87         900000,  950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000,
  88        1300000, 1350000, 1400000, 1450000, 1500000, 1600000, 1875000, 2250000,
  89};
  90
  91#define SW2_table SW1_table
  92
  93static const unsigned int SW3_table[] = {
  94        4000000, 4500000, 5000000, 5500000,
  95};
  96
  97struct pcap_regulator {
  98        const u8 reg;
  99        const u8 en;
 100        const u8 index;
 101        const u8 stby;
 102        const u8 lowpwr;
 103};
 104
 105#define NA 0xff
 106
 107#define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr)             \
 108        [_vreg] = {                                                     \
 109                .reg            = _reg,                                 \
 110                .en             = _en,                                  \
 111                .index          = _index,                               \
 112                .stby           = _stby,                                \
 113                .lowpwr         = _lowpwr,                              \
 114        }
 115
 116static struct pcap_regulator vreg_table[] = {
 117        VREG_INFO(V1,    PCAP_REG_VREG1,   1,  2,  18, 0),
 118        VREG_INFO(V2,    PCAP_REG_VREG1,   5,  6,  19, 22),
 119        VREG_INFO(V3,    PCAP_REG_VREG1,   7,  8,  20, 23),
 120        VREG_INFO(V4,    PCAP_REG_VREG1,   11, 12, 21, 24),
 121        /* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
 122        VREG_INFO(V5,    PCAP_REG_VREG1,   15, 16, 12, 19),
 123
 124        VREG_INFO(V6,    PCAP_REG_VREG2,   1,  2,  14, 20),
 125        VREG_INFO(V7,    PCAP_REG_VREG2,   3,  4,  15, 21),
 126        VREG_INFO(V8,    PCAP_REG_VREG2,   5,  6,  16, 22),
 127        VREG_INFO(V9,    PCAP_REG_VREG2,   9,  10, 17, 23),
 128        VREG_INFO(V10,   PCAP_REG_VREG2,   10, NA, 18, 24),
 129
 130        VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1,  2,  22, 23),
 131        /* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
 132        VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4,  5,  0,  1),
 133        VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7,  8,  2,  3),
 134        VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4,  5),
 135        VREG_INFO(VSIM,  PCAP_REG_AUXVREG, 17, 18, NA, 6),
 136        VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
 137        VREG_INFO(VVIB,  PCAP_REG_AUXVREG, 19, 20, NA, NA),
 138
 139        VREG_INFO(SW1,   PCAP_REG_SWCTRL,  1,  2,  NA, NA),
 140        VREG_INFO(SW2,   PCAP_REG_SWCTRL,  6,  7,  NA, NA),
 141        /* SW3 STBY is on PCAP_REG_AUXVREG */
 142        VREG_INFO(SW3,   PCAP_REG_SWCTRL,  11, 12, 24, NA),
 143
 144        /* SWxS used to control SWx voltage on standby */
 145/*      VREG_INFO(SW1S,  PCAP_REG_LOWPWR,  NA, 12, NA, NA),
 146        VREG_INFO(SW2S,  PCAP_REG_LOWPWR,  NA, 20, NA, NA), */
 147};
 148
 149static int pcap_regulator_set_voltage_sel(struct regulator_dev *rdev,
 150                                          unsigned selector)
 151{
 152        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 153        void *pcap = rdev_get_drvdata(rdev);
 154
 155        /* the regulator doesn't support voltage switching */
 156        if (rdev->desc->n_voltages == 1)
 157                return -EINVAL;
 158
 159        return ezx_pcap_set_bits(pcap, vreg->reg,
 160                                 (rdev->desc->n_voltages - 1) << vreg->index,
 161                                 selector << vreg->index);
 162}
 163
 164static int pcap_regulator_get_voltage_sel(struct regulator_dev *rdev)
 165{
 166        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 167        void *pcap = rdev_get_drvdata(rdev);
 168        u32 tmp;
 169
 170        if (rdev->desc->n_voltages == 1)
 171                return 0;
 172
 173        ezx_pcap_read(pcap, vreg->reg, &tmp);
 174        tmp = ((tmp >> vreg->index) & (rdev->desc->n_voltages - 1));
 175        return tmp;
 176}
 177
 178static int pcap_regulator_enable(struct regulator_dev *rdev)
 179{
 180        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 181        void *pcap = rdev_get_drvdata(rdev);
 182
 183        if (vreg->en == NA)
 184                return -EINVAL;
 185
 186        return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
 187}
 188
 189static int pcap_regulator_disable(struct regulator_dev *rdev)
 190{
 191        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 192        void *pcap = rdev_get_drvdata(rdev);
 193
 194        if (vreg->en == NA)
 195                return -EINVAL;
 196
 197        return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
 198}
 199
 200static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
 201{
 202        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 203        void *pcap = rdev_get_drvdata(rdev);
 204        u32 tmp;
 205
 206        if (vreg->en == NA)
 207                return -EINVAL;
 208
 209        ezx_pcap_read(pcap, vreg->reg, &tmp);
 210        return (tmp >> vreg->en) & 1;
 211}
 212
 213static struct regulator_ops pcap_regulator_ops = {
 214        .list_voltage   = regulator_list_voltage_table,
 215        .set_voltage_sel = pcap_regulator_set_voltage_sel,
 216        .get_voltage_sel = pcap_regulator_get_voltage_sel,
 217        .enable         = pcap_regulator_enable,
 218        .disable        = pcap_regulator_disable,
 219        .is_enabled     = pcap_regulator_is_enabled,
 220};
 221
 222#define VREG(_vreg)                                             \
 223        [_vreg] = {                                             \
 224                .name           = #_vreg,                       \
 225                .id             = _vreg,                        \
 226                .n_voltages     = ARRAY_SIZE(_vreg##_table),    \
 227                .volt_table     = _vreg##_table,                \
 228                .ops            = &pcap_regulator_ops,          \
 229                .type           = REGULATOR_VOLTAGE,            \
 230                .owner          = THIS_MODULE,                  \
 231        }
 232
 233static const struct regulator_desc pcap_regulators[] = {
 234        VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
 235        VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
 236        VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
 237};
 238
 239static int pcap_regulator_probe(struct platform_device *pdev)
 240{
 241        struct regulator_dev *rdev;
 242        void *pcap = dev_get_drvdata(pdev->dev.parent);
 243        struct regulator_config config = { };
 244
 245        config.dev = &pdev->dev;
 246        config.init_data = pdev->dev.platform_data;
 247        config.driver_data = pcap;
 248
 249        rdev = regulator_register(&pcap_regulators[pdev->id], &config);
 250        if (IS_ERR(rdev))
 251                return PTR_ERR(rdev);
 252
 253        platform_set_drvdata(pdev, rdev);
 254
 255        return 0;
 256}
 257
 258static int pcap_regulator_remove(struct platform_device *pdev)
 259{
 260        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 261
 262        regulator_unregister(rdev);
 263
 264        return 0;
 265}
 266
 267static struct platform_driver pcap_regulator_driver = {
 268        .driver = {
 269                .name   = "pcap-regulator",
 270                .owner  = THIS_MODULE,
 271        },
 272        .probe  = pcap_regulator_probe,
 273        .remove = pcap_regulator_remove,
 274};
 275
 276static int __init pcap_regulator_init(void)
 277{
 278        return platform_driver_register(&pcap_regulator_driver);
 279}
 280
 281static void __exit pcap_regulator_exit(void)
 282{
 283        platform_driver_unregister(&pcap_regulator_driver);
 284}
 285
 286subsys_initcall(pcap_regulator_init);
 287module_exit(pcap_regulator_exit);
 288
 289MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
 290MODULE_DESCRIPTION("PCAP2 Regulator Driver");
 291MODULE_LICENSE("GPL");
 292
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