drivers/regulator/pcap-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * PCAP2 Regulator Driver
   4  *
   5  * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/err.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/machine.h>
  15 #include <linux/mfd/ezx-pcap.h>
  16
  17 static const unsigned int V1_table[] = {
  18         2775000, 1275000, 1600000, 1725000, 1825000, 1925000, 2075000, 2275000,
  19 };
  20
  21 static const unsigned int V2_table[] = {
  22         2500000, 2775000,
  23 };
  24
  25 static const unsigned int V3_table[] = {
  26         1075000, 1275000, 1550000, 1725000, 1876000, 1950000, 2075000, 2275000,
  27 };
  28
  29 static const unsigned int V4_table[] = {
  30         1275000, 1550000, 1725000, 1875000, 1950000, 2075000, 2275000, 2775000,
  31 };
  32
  33 static const unsigned int V5_table[] = {
  34         1875000, 2275000, 2475000, 2775000,
  35 };
  36
  37 static const unsigned int V6_table[] = {
  38         2475000, 2775000,
  39 };
  40
  41 static const unsigned int V7_table[] = {
  42         1875000, 2775000,
  43 };
  44
  45 #define V8_table V4_table
  46
  47 static const unsigned int V9_table[] = {
  48         1575000, 1875000, 2475000, 2775000,
  49 };
  50
  51 static const unsigned int V10_table[] = {
  52         5000000,
  53 };
  54
  55 static const unsigned int VAUX1_table[] = {
  56         1875000, 2475000, 2775000, 3000000,
  57 };
  58
  59 #define VAUX2_table VAUX1_table
  60
  61 static const unsigned int VAUX3_table[] = {
  62         1200000, 1200000, 1200000, 1200000, 1400000, 1600000, 1800000, 2000000,
  63         2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, 3600000,
  64 };
  65
  66 static const unsigned int VAUX4_table[] = {
  67         1800000, 1800000, 3000000, 5000000,
  68 };
  69
  70 static const unsigned int VSIM_table[] = {
  71         1875000, 3000000,
  72 };
  73
  74 static const unsigned int VSIM2_table[] = {
  75         1875000,
  76 };
  77
  78 static const unsigned int VVIB_table[] = {
  79         1300000, 1800000, 2000000, 3000000,
  80 };
  81
  82 static const unsigned int SW1_table[] = {
  83          900000,  950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000,
  84         1300000, 1350000, 1400000, 1450000, 1500000, 1600000, 1875000, 2250000,
  85 };
  86
  87 #define SW2_table SW1_table
  88
  89 static const unsigned int SW3_table[] = {
  90         4000000, 4500000, 5000000, 5500000,
  91 };
  92
  93 struct pcap_regulator {
  94         const u8 reg;
  95         const u8 en;
  96         const u8 index;
  97         const u8 stby;
  98         const u8 lowpwr;
  99 };
 100
 101 #define NA 0xff
 102
 103 #define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr)             \
 104         [_vreg] = {                                                     \
 105                 .reg            = _reg,                                 \
 106                 .en             = _en,                                  \
 107                 .index          = _index,                               \
 108                 .stby           = _stby,                                \
 109                 .lowpwr         = _lowpwr,                              \
 110         }
 111
 112 static struct pcap_regulator vreg_table[] = {
 113         VREG_INFO(V1,    PCAP_REG_VREG1,   1,  2,  18, 0),
 114         VREG_INFO(V2,    PCAP_REG_VREG1,   5,  6,  19, 22),
 115         VREG_INFO(V3,    PCAP_REG_VREG1,   7,  8,  20, 23),
 116         VREG_INFO(V4,    PCAP_REG_VREG1,   11, 12, 21, 24),
 117         /* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
 118         VREG_INFO(V5,    PCAP_REG_VREG1,   15, 16, 12, 19),
 119
 120         VREG_INFO(V6,    PCAP_REG_VREG2,   1,  2,  14, 20),
 121         VREG_INFO(V7,    PCAP_REG_VREG2,   3,  4,  15, 21),
 122         VREG_INFO(V8,    PCAP_REG_VREG2,   5,  6,  16, 22),
 123         VREG_INFO(V9,    PCAP_REG_VREG2,   9,  10, 17, 23),
 124         VREG_INFO(V10,   PCAP_REG_VREG2,   10, NA, 18, 24),
 125
 126         VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1,  2,  22, 23),
 127         /* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
 128         VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4,  5,  0,  1),
 129         VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7,  8,  2,  3),
 130         VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4,  5),
 131         VREG_INFO(VSIM,  PCAP_REG_AUXVREG, 17, 18, NA, 6),
 132         VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
 133         VREG_INFO(VVIB,  PCAP_REG_AUXVREG, 19, 20, NA, NA),
 134
 135         VREG_INFO(SW1,   PCAP_REG_SWCTRL,  1,  2,  NA, NA),
 136         VREG_INFO(SW2,   PCAP_REG_SWCTRL,  6,  7,  NA, NA),
 137         /* SW3 STBY is on PCAP_REG_AUXVREG */
 138         VREG_INFO(SW3,   PCAP_REG_SWCTRL,  11, 12, 24, NA),
 139
 140         /* SWxS used to control SWx voltage on standby */
 141 /*      VREG_INFO(SW1S,  PCAP_REG_LOWPWR,  NA, 12, NA, NA),
 142         VREG_INFO(SW2S,  PCAP_REG_LOWPWR,  NA, 20, NA, NA), */
 143 };
 144
 145 static int pcap_regulator_set_voltage_sel(struct regulator_dev *rdev,
 146                                           unsigned selector)
 147 {
 148         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 149         void *pcap = rdev_get_drvdata(rdev);
 150
 151         /* the regulator doesn't support voltage switching */
 152         if (rdev->desc->n_voltages == 1)
 153                 return -EINVAL;
 154
 155         return ezx_pcap_set_bits(pcap, vreg->reg,
 156                                  (rdev->desc->n_voltages - 1) << vreg->index,
 157                                  selector << vreg->index);
 158 }
 159
 160 static int pcap_regulator_get_voltage_sel(struct regulator_dev *rdev)
 161 {
 162         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 163         void *pcap = rdev_get_drvdata(rdev);
 164         u32 tmp;
 165
 166         if (rdev->desc->n_voltages == 1)
 167                 return 0;
 168
 169         ezx_pcap_read(pcap, vreg->reg, &tmp);
 170         tmp = ((tmp >> vreg->index) & (rdev->desc->n_voltages - 1));
 171         return tmp;
 172 }
 173
 174 static int pcap_regulator_enable(struct regulator_dev *rdev)
 175 {
 176         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 177         void *pcap = rdev_get_drvdata(rdev);
 178
 179         if (vreg->en == NA)
 180                 return -EINVAL;
 181
 182         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
 183 }
 184
 185 static int pcap_regulator_disable(struct regulator_dev *rdev)
 186 {
 187         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 188         void *pcap = rdev_get_drvdata(rdev);
 189
 190         if (vreg->en == NA)
 191                 return -EINVAL;
 192
 193         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
 194 }
 195
 196 static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
 197 {
 198         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 199         void *pcap = rdev_get_drvdata(rdev);
 200         u32 tmp;
 201
 202         if (vreg->en == NA)
 203                 return -EINVAL;
 204
 205         ezx_pcap_read(pcap, vreg->reg, &tmp);
 206         return (tmp >> vreg->en) & 1;
 207 }
 208
 209 static const struct regulator_ops pcap_regulator_ops = {
 210         .list_voltage   = regulator_list_voltage_table,
 211         .set_voltage_sel = pcap_regulator_set_voltage_sel,
 212         .get_voltage_sel = pcap_regulator_get_voltage_sel,
 213         .enable         = pcap_regulator_enable,
 214         .disable        = pcap_regulator_disable,
 215         .is_enabled     = pcap_regulator_is_enabled,
 216 };
 217
 218 #define VREG(_vreg)                                             \
 219         [_vreg] = {                                             \
 220                 .name           = #_vreg,                       \
 221                 .id             = _vreg,                        \
 222                 .n_voltages     = ARRAY_SIZE(_vreg##_table),    \
 223                 .volt_table     = _vreg##_table,                \
 224                 .ops            = &pcap_regulator_ops,          \
 225                 .type           = REGULATOR_VOLTAGE,            \
 226                 .owner          = THIS_MODULE,                  \
 227         }
 228
 229 static const struct regulator_desc pcap_regulators[] = {
 230         VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
 231         VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
 232         VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
 233 };
 234
 235 static int pcap_regulator_probe(struct platform_device *pdev)
 236 {
 237         struct regulator_dev *rdev;
 238         void *pcap = dev_get_drvdata(pdev->dev.parent);
 239         struct regulator_config config = { };
 240
 241         config.dev = &pdev->dev;
 242         config.init_data = dev_get_platdata(&pdev->dev);
 243         config.driver_data = pcap;
 244
 245         rdev = devm_regulator_register(&pdev->dev, &pcap_regulators[pdev->id],
 246                                        &config);
 247         if (IS_ERR(rdev))
 248                 return PTR_ERR(rdev);
 249
 250         platform_set_drvdata(pdev, rdev);
 251
 252         return 0;
 253 }
 254
 255 static struct platform_driver pcap_regulator_driver = {
 256         .driver = {
 257                 .name   = "pcap-regulator",
 258         },
 259         .probe  = pcap_regulator_probe,
 260 };
 261
 262 static int __init pcap_regulator_init(void)
 263 {
 264         return platform_driver_register(&pcap_regulator_driver);
 265 }
 266
 267 static void __exit pcap_regulator_exit(void)
 268 {
 269         platform_driver_unregister(&pcap_regulator_driver);
 270 }
 271
 272 subsys_initcall(pcap_regulator_init);
 273 module_exit(pcap_regulator_exit);
 274
 275 MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
 276 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
 277 MODULE_LICENSE("GPL");