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 u16 V1_table[] = {
  22         2775, 1275, 1600, 1725, 1825, 1925, 2075, 2275,
  23 };
  24
  25 static const u16 V2_table[] = {
  26         2500, 2775,
  27 };
  28
  29 static const u16 V3_table[] = {
  30         1075, 1275, 1550, 1725, 1876, 1950, 2075, 2275,
  31 };
  32
  33 static const u16 V4_table[] = {
  34         1275, 1550, 1725, 1875, 1950, 2075, 2275, 2775,
  35 };
  36
  37 static const u16 V5_table[] = {
  38         1875, 2275, 2475, 2775,
  39 };
  40
  41 static const u16 V6_table[] = {
  42         2475, 2775,
  43 };
  44
  45 static const u16 V7_table[] = {
  46         1875, 2775,
  47 };
  48
  49 #define V8_table V4_table
  50
  51 static const u16 V9_table[] = {
  52         1575, 1875, 2475, 2775,
  53 };
  54
  55 static const u16 V10_table[] = {
  56         5000,
  57 };
  58
  59 static const u16 VAUX1_table[] = {
  60         1875, 2475, 2775, 3000,
  61 };
  62
  63 #define VAUX2_table VAUX1_table
  64
  65 static const u16 VAUX3_table[] = {
  66         1200, 1200, 1200, 1200, 1400, 1600, 1800, 2000,
  67         2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600,
  68 };
  69
  70 static const u16 VAUX4_table[] = {
  71         1800, 1800, 3000, 5000,
  72 };
  73
  74 static const u16 VSIM_table[] = {
  75         1875, 3000,
  76 };
  77
  78 static const u16 VSIM2_table[] = {
  79         1875,
  80 };
  81
  82 static const u16 VVIB_table[] = {
  83         1300, 1800, 2000, 3000,
  84 };
  85
  86 static 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
  93 static const u16 SW3_table[] = {
  94         4000, 4500, 5000, 5500,
  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         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
 120 static 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
 153 static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
 154                                                 int min_uV, int max_uV)
 155 {
 156         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 157         void *pcap = rdev_get_drvdata(rdev);
 158         int uV;
 159         u8 i;
 160
 161         /* the regulator doesn't support voltage switching */
 162         if (vreg->n_voltages == 1)
 163                 return -EINVAL;
 164
 165         for (i = 0; i < vreg->n_voltages; i++) {
 166                 /* For V1 the first is not the best match */
 167                 if (i == 0 && rdev_get_id(rdev) == V1)
 168                         i = 1;
 169                 else if (i + 1 == vreg->n_voltages && rdev_get_id(rdev) == V1)
 170                         i = 0;
 171
 172                 uV = vreg->voltage_table[i] * 1000;
 173                 if (min_uV <= uV && uV <= max_uV)
 174                         return ezx_pcap_set_bits(pcap, vreg->reg,
 175                                         (vreg->n_voltages - 1) << vreg->index,
 176                                         i << vreg->index);
 177
 178                 if (i == 0 && rdev_get_id(rdev) == V1)
 179                         i = vreg->n_voltages - 1;
 180         }
 181
 182         /* the requested voltage range is not supported by this regulator */
 183         return -EINVAL;
 184 }
 185
 186 static int pcap_regulator_get_voltage(struct regulator_dev *rdev)
 187 {
 188         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 189         void *pcap = rdev_get_drvdata(rdev);
 190         u32 tmp;
 191         int mV;
 192
 193         if (vreg->n_voltages == 1)
 194                 return vreg->voltage_table[0] * 1000;
 195
 196         ezx_pcap_read(pcap, vreg->reg, &tmp);
 197         tmp = ((tmp >> vreg->index) & (vreg->n_voltages - 1));
 198         mV = vreg->voltage_table[tmp];
 199
 200         return mV * 1000;
 201 }
 202
 203 static int pcap_regulator_enable(struct regulator_dev *rdev)
 204 {
 205         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 206         void *pcap = rdev_get_drvdata(rdev);
 207
 208         if (vreg->en == NA)
 209                 return -EINVAL;
 210
 211         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
 212 }
 213
 214 static int pcap_regulator_disable(struct regulator_dev *rdev)
 215 {
 216         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 217         void *pcap = rdev_get_drvdata(rdev);
 218
 219         if (vreg->en == NA)
 220                 return -EINVAL;
 221
 222         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
 223 }
 224
 225 static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
 226 {
 227         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 228         void *pcap = rdev_get_drvdata(rdev);
 229         u32 tmp;
 230
 231         if (vreg->en == NA)
 232                 return -EINVAL;
 233
 234         ezx_pcap_read(pcap, vreg->reg, &tmp);
 235         return (tmp >> vreg->en) & 1;
 236 }
 237
 238 static int pcap_regulator_list_voltage(struct regulator_dev *rdev,
 239                                                         unsigned int index)
 240 {
 241         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 242
 243         return vreg->voltage_table[index] * 1000;
 244 }
 245
 246 static struct regulator_ops pcap_regulator_ops = {
 247         .list_voltage   = pcap_regulator_list_voltage,
 248         .set_voltage    = pcap_regulator_set_voltage,
 249         .get_voltage    = pcap_regulator_get_voltage,
 250         .enable         = pcap_regulator_enable,
 251         .disable        = pcap_regulator_disable,
 252         .is_enabled     = pcap_regulator_is_enabled,
 253 };
 254
 255 #define VREG(_vreg)                                             \
 256         [_vreg] = {                                             \
 257                 .name           = #_vreg,                       \
 258                 .id             = _vreg,                        \
 259                 .n_voltages     = ARRAY_SIZE(_vreg##_table),    \
 260                 .ops            = &pcap_regulator_ops,          \
 261                 .type           = REGULATOR_VOLTAGE,            \
 262                 .owner          = THIS_MODULE,                  \
 263         }
 264
 265 static struct regulator_desc pcap_regulators[] = {
 266         VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
 267         VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
 268         VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
 269 };
 270
 271 static int __devinit pcap_regulator_probe(struct platform_device *pdev)
 272 {
 273         struct regulator_dev *rdev;
 274         void *pcap = dev_get_drvdata(pdev->dev.parent);
 275
 276         rdev = regulator_register(&pcap_regulators[pdev->id], &pdev->dev,
 277                                 pdev->dev.platform_data, pcap);
 278         if (IS_ERR(rdev))
 279                 return PTR_ERR(rdev);
 280
 281         platform_set_drvdata(pdev, rdev);
 282
 283         return 0;
 284 }
 285
 286 static int __devexit pcap_regulator_remove(struct platform_device *pdev)
 287 {
 288         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 289
 290         regulator_unregister(rdev);
 291         platform_set_drvdata(pdev, NULL);
 292
 293         return 0;
 294 }
 295
 296 static struct platform_driver pcap_regulator_driver = {
 297         .driver = {
 298                 .name   = "pcap-regulator",
 299                 .owner  = THIS_MODULE,
 300         },
 301         .probe  = pcap_regulator_probe,
 302         .remove = __devexit_p(pcap_regulator_remove),
 303 };
 304
 305 static int __init pcap_regulator_init(void)
 306 {
 307         return platform_driver_register(&pcap_regulator_driver);
 308 }
 309
 310 static void __exit pcap_regulator_exit(void)
 311 {
 312         platform_driver_unregister(&pcap_regulator_driver);
 313 }
 314
 315 subsys_initcall(pcap_regulator_init);
 316 module_exit(pcap_regulator_exit);
 317
 318 MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
 319 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
 320 MODULE_LICENSE("GPL");