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 u16 V1_table[] = {
  22        2775, 1275, 1600, 1725, 1825, 1925, 2075, 2275,
  23};
  24
  25static const u16 V2_table[] = {
  26        2500, 2775,
  27};
  28
  29static const u16 V3_table[] = {
  30        1075, 1275, 1550, 1725, 1876, 1950, 2075, 2275,
  31};
  32
  33static const u16 V4_table[] = {
  34        1275, 1550, 1725, 1875, 1950, 2075, 2275, 2775,
  35};
  36
  37static const u16 V5_table[] = {
  38        1875, 2275, 2475, 2775,
  39};
  40
  41static const u16 V6_table[] = {
  42        2475, 2775,
  43};
  44
  45static const u16 V7_table[] = {
  46        1875, 2775,
  47};
  48
  49#define V8_table V4_table
  50
  51static const u16 V9_table[] = {
  52        1575, 1875, 2475, 2775,
  53};
  54
  55static const u16 V10_table[] = {
  56        5000,
  57};
  58
  59static const u16 VAUX1_table[] = {
  60        1875, 2475, 2775, 3000,
  61};
  62
  63#define VAUX2_table VAUX1_table
  64
  65static const u16 VAUX3_table[] = {
  66        1200, 1200, 1200, 1200, 1400, 1600, 1800, 2000,
  67        2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600,
  68};
  69
  70static const u16 VAUX4_table[] = {
  71        1800, 1800, 3000, 5000,
  72};
  73
  74static const u16 VSIM_table[] = {
  75        1875, 3000,
  76};
  77
  78static const u16 VSIM2_table[] = {
  79        1875,
  80};
  81
  82static const u16 VVIB_table[] = {
  83        1300, 1800, 2000, 3000,
  84};
  85
  86static const u16 SW1_table[] = {
  87        900, 950, 1000, 1050, 1100, 1150, 1200, 1250,
  88        1300, 1350, 1400, 1450, 1500, 1600, 1875, 2250,
  89};
  90
  91#define SW2_table SW1_table
  92
  93static const u16 SW3_table[] = {
  94        4000, 4500, 5000, 5500,
  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        const u8 n_voltages;
 104        const u16 *voltage_table;
 105};
 106
 107#define NA 0xff
 108
 109#define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr)             \
 110        [_vreg] = {                                                     \
 111                .reg            = _reg,                                 \
 112                .en             = _en,                                  \
 113                .index          = _index,                               \
 114                .stby           = _stby,                                \
 115                .lowpwr         = _lowpwr,                              \
 116                .n_voltages     = ARRAY_SIZE(_vreg##_table),            \
 117                .voltage_table  = _vreg##_table,                        \
 118        }
 119
 120static struct pcap_regulator vreg_table[] = {
 121        VREG_INFO(V1,    PCAP_REG_VREG1,   1,  2,  18, 0),
 122        VREG_INFO(V2,    PCAP_REG_VREG1,   5,  6,  19, 22),
 123        VREG_INFO(V3,    PCAP_REG_VREG1,   7,  8,  20, 23),
 124        VREG_INFO(V4,    PCAP_REG_VREG1,   11, 12, 21, 24),
 125        /* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
 126        VREG_INFO(V5,    PCAP_REG_VREG1,   15, 16, 12, 19),
 127
 128        VREG_INFO(V6,    PCAP_REG_VREG2,   1,  2,  14, 20),
 129        VREG_INFO(V7,    PCAP_REG_VREG2,   3,  4,  15, 21),
 130        VREG_INFO(V8,    PCAP_REG_VREG2,   5,  6,  16, 22),
 131        VREG_INFO(V9,    PCAP_REG_VREG2,   9,  10, 17, 23),
 132        VREG_INFO(V10,   PCAP_REG_VREG2,   10, NA, 18, 24),
 133
 134        VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1,  2,  22, 23),
 135        /* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
 136        VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4,  5,  0,  1),
 137        VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7,  8,  2,  3),
 138        VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4,  5),
 139        VREG_INFO(VSIM,  PCAP_REG_AUXVREG, 17, 18, NA, 6),
 140        VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
 141        VREG_INFO(VVIB,  PCAP_REG_AUXVREG, 19, 20, NA, NA),
 142
 143        VREG_INFO(SW1,   PCAP_REG_SWCTRL,  1,  2,  NA, NA),
 144        VREG_INFO(SW2,   PCAP_REG_SWCTRL,  6,  7,  NA, NA),
 145        /* SW3 STBY is on PCAP_REG_AUXVREG */
 146        VREG_INFO(SW3,   PCAP_REG_SWCTRL,  11, 12, 24, NA),
 147
 148        /* SWxS used to control SWx voltage on standby */
 149/*      VREG_INFO(SW1S,  PCAP_REG_LOWPWR,  NA, 12, NA, NA),
 150        VREG_INFO(SW2S,  PCAP_REG_LOWPWR,  NA, 20, NA, NA), */
 151};
 152
 153static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
 154                                      int min_uV, int max_uV,
 155                                      unsigned *selector)
 156{
 157        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 158        void *pcap = rdev_get_drvdata(rdev);
 159        int uV;
 160        u8 i;
 161
 162        /* the regulator doesn't support voltage switching */
 163        if (vreg->n_voltages == 1)
 164                return -EINVAL;
 165
 166        for (i = 0; i < vreg->n_voltages; i++) {
 167                /* For V1 the first is not the best match */
 168                if (i == 0 && rdev_get_id(rdev) == V1)
 169                        i = 1;
 170                else if (i + 1 == vreg->n_voltages && rdev_get_id(rdev) == V1)
 171                        i = 0;
 172
 173                uV = vreg->voltage_table[i] * 1000;
 174                if (min_uV <= uV && uV <= max_uV) {
 175                        *selector = i;
 176                        return ezx_pcap_set_bits(pcap, vreg->reg,
 177                                        (vreg->n_voltages - 1) << vreg->index,
 178                                        i << vreg->index);
 179                }
 180
 181                if (i == 0 && rdev_get_id(rdev) == V1)
 182                        i = vreg->n_voltages - 1;
 183        }
 184
 185        /* the requested voltage range is not supported by this regulator */
 186        return -EINVAL;
 187}
 188
 189static int pcap_regulator_get_voltage(struct regulator_dev *rdev)
 190{
 191        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 192        void *pcap = rdev_get_drvdata(rdev);
 193        u32 tmp;
 194        int mV;
 195
 196        if (vreg->n_voltages == 1)
 197                return vreg->voltage_table[0] * 1000;
 198
 199        ezx_pcap_read(pcap, vreg->reg, &tmp);
 200        tmp = ((tmp >> vreg->index) & (vreg->n_voltages - 1));
 201        mV = vreg->voltage_table[tmp];
 202
 203        return mV * 1000;
 204}
 205
 206static int pcap_regulator_enable(struct regulator_dev *rdev)
 207{
 208        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 209        void *pcap = rdev_get_drvdata(rdev);
 210
 211        if (vreg->en == NA)
 212                return -EINVAL;
 213
 214        return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
 215}
 216
 217static int pcap_regulator_disable(struct regulator_dev *rdev)
 218{
 219        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 220        void *pcap = rdev_get_drvdata(rdev);
 221
 222        if (vreg->en == NA)
 223                return -EINVAL;
 224
 225        return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
 226}
 227
 228static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
 229{
 230        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 231        void *pcap = rdev_get_drvdata(rdev);
 232        u32 tmp;
 233
 234        if (vreg->en == NA)
 235                return -EINVAL;
 236
 237        ezx_pcap_read(pcap, vreg->reg, &tmp);
 238        return (tmp >> vreg->en) & 1;
 239}
 240
 241static int pcap_regulator_list_voltage(struct regulator_dev *rdev,
 242                                                        unsigned int index)
 243{
 244        struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 245
 246        return vreg->voltage_table[index] * 1000;
 247}
 248
 249static struct regulator_ops pcap_regulator_ops = {
 250        .list_voltage   = pcap_regulator_list_voltage,
 251        .set_voltage    = pcap_regulator_set_voltage,
 252        .get_voltage    = pcap_regulator_get_voltage,
 253        .enable         = pcap_regulator_enable,
 254        .disable        = pcap_regulator_disable,
 255        .is_enabled     = pcap_regulator_is_enabled,
 256};
 257
 258#define VREG(_vreg)                                             \
 259        [_vreg] = {                                             \
 260                .name           = #_vreg,                       \
 261                .id             = _vreg,                        \
 262                .n_voltages     = ARRAY_SIZE(_vreg##_table),    \
 263                .ops            = &pcap_regulator_ops,          \
 264                .type           = REGULATOR_VOLTAGE,            \
 265                .owner          = THIS_MODULE,                  \
 266        }
 267
 268static struct regulator_desc pcap_regulators[] = {
 269        VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
 270        VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
 271        VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
 272};
 273
 274static int __devinit pcap_regulator_probe(struct platform_device *pdev)
 275{
 276        struct regulator_dev *rdev;
 277        void *pcap = dev_get_drvdata(pdev->dev.parent);
 278
 279        rdev = regulator_register(&pcap_regulators[pdev->id], &pdev->dev,
 280                                pdev->dev.platform_data, pcap, NULL);
 281        if (IS_ERR(rdev))
 282                return PTR_ERR(rdev);
 283
 284        platform_set_drvdata(pdev, rdev);
 285
 286        return 0;
 287}
 288
 289static int __devexit pcap_regulator_remove(struct platform_device *pdev)
 290{
 291        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 292
 293        regulator_unregister(rdev);
 294        platform_set_drvdata(pdev, NULL);
 295
 296        return 0;
 297}
 298
 299static struct platform_driver pcap_regulator_driver = {
 300        .driver = {
 301                .name   = "pcap-regulator",
 302                .owner  = THIS_MODULE,
 303        },
 304        .probe  = pcap_regulator_probe,
 305        .remove = __devexit_p(pcap_regulator_remove),
 306};
 307
 308static int __init pcap_regulator_init(void)
 309{
 310        return platform_driver_register(&pcap_regulator_driver);
 311}
 312
 313static void __exit pcap_regulator_exit(void)
 314{
 315        platform_driver_unregister(&pcap_regulator_driver);
 316}
 317
 318subsys_initcall(pcap_regulator_init);
 319module_exit(pcap_regulator_exit);
 320
 321MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
 322MODULE_DESCRIPTION("PCAP2 Regulator Driver");
 323MODULE_LICENSE("GPL");
 324