drivers/regulator/pcap-regulator.c

   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
  21 static const unsigned int V1_table[] = {
  22         2775000, 1275000, 1600000, 1725000, 1825000, 1925000, 2075000, 2275000,
  23 };
  24
  25 static const unsigned int V2_table[] = {
  26         2500000, 2775000,
  27 };
  28
  29 static const unsigned int V3_table[] = {
  30         1075000, 1275000, 1550000, 1725000, 1876000, 1950000, 2075000, 2275000,
  31 };
  32
  33 static const unsigned int V4_table[] = {
  34         1275000, 1550000, 1725000, 1875000, 1950000, 2075000, 2275000, 2775000,
  35 };
  36
  37 static const unsigned int V5_table[] = {
  38         1875000, 2275000, 2475000, 2775000,
  39 };
  40
  41 static const unsigned int V6_table[] = {
  42         2475000, 2775000,
  43 };
  44
  45 static const unsigned int V7_table[] = {
  46         1875000, 2775000,
  47 };
  48
  49 #define V8_table V4_table
  50
  51 static const unsigned int V9_table[] = {
  52         1575000, 1875000, 2475000, 2775000,
  53 };
  54
  55 static const unsigned int V10_table[] = {
  56         5000000,
  57 };
  58
  59 static const unsigned int VAUX1_table[] = {
  60         1875000, 2475000, 2775000, 3000000,
  61 };
  62
  63 #define VAUX2_table VAUX1_table
  64
  65 static 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
  70 static const unsigned int VAUX4_table[] = {
  71         1800000, 1800000, 3000000, 5000000,
  72 };
  73
  74 static const unsigned int VSIM_table[] = {
  75         1875000, 3000000,
  76 };
  77
  78 static const unsigned int VSIM2_table[] = {
  79         1875000,
  80 };
  81
  82 static const unsigned int VVIB_table[] = {
  83         1300000, 1800000, 2000000, 3000000,
  84 };
  85
  86 static 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
  93 static const unsigned int SW3_table[] = {
  94         4000000, 4500000, 5000000, 5500000,
  95 };
  96
  97 struct 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
 116 static 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
 149 static 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
 164 static 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
 178 static 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
 189 static 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
 200 static 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
 213 static 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
 233 static 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
 239 static int __devinit 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
 258 static int __devexit pcap_regulator_remove(struct platform_device *pdev)
 259 {
 260         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 261
 262         regulator_unregister(rdev);
 263         platform_set_drvdata(pdev, NULL);
 264
 265         return 0;
 266 }
 267
 268 static struct platform_driver pcap_regulator_driver = {
 269         .driver = {
 270                 .name   = "pcap-regulator",
 271                 .owner  = THIS_MODULE,
 272         },
 273         .probe  = pcap_regulator_probe,
 274         .remove = __devexit_p(pcap_regulator_remove),
 275 };
 276
 277 static int __init pcap_regulator_init(void)
 278 {
 279         return platform_driver_register(&pcap_regulator_driver);
 280 }
 281
 282 static void __exit pcap_regulator_exit(void)
 283 {
 284         platform_driver_unregister(&pcap_regulator_driver);
 285 }
 286
 287 subsys_initcall(pcap_regulator_init);
 288 module_exit(pcap_regulator_exit);
 289
 290 MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
 291 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
 292 MODULE_LICENSE("GPL");