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 struct pcap_regulator {
  90         const u8 reg;
  91         const u8 en;
  92         const u8 index;
  93         const u8 stby;
  94         const u8 lowpwr;
  95 };
  96
  97 #define NA 0xff
  98
  99 #define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr)             \
 100         [_vreg] = {                                                     \
 101                 .reg            = _reg,                                 \
 102                 .en             = _en,                                  \
 103                 .index          = _index,                               \
 104                 .stby           = _stby,                                \
 105                 .lowpwr         = _lowpwr,                              \
 106         }
 107
 108 static struct pcap_regulator vreg_table[] = {
 109         VREG_INFO(V1,    PCAP_REG_VREG1,   1,  2,  18, 0),
 110         VREG_INFO(V2,    PCAP_REG_VREG1,   5,  6,  19, 22),
 111         VREG_INFO(V3,    PCAP_REG_VREG1,   7,  8,  20, 23),
 112         VREG_INFO(V4,    PCAP_REG_VREG1,   11, 12, 21, 24),
 113         /* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
 114         VREG_INFO(V5,    PCAP_REG_VREG1,   15, 16, 12, 19),
 115
 116         VREG_INFO(V6,    PCAP_REG_VREG2,   1,  2,  14, 20),
 117         VREG_INFO(V7,    PCAP_REG_VREG2,   3,  4,  15, 21),
 118         VREG_INFO(V8,    PCAP_REG_VREG2,   5,  6,  16, 22),
 119         VREG_INFO(V9,    PCAP_REG_VREG2,   9,  10, 17, 23),
 120         VREG_INFO(V10,   PCAP_REG_VREG2,   10, NA, 18, 24),
 121
 122         VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1,  2,  22, 23),
 123         /* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
 124         VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4,  5,  0,  1),
 125         VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7,  8,  2,  3),
 126         VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4,  5),
 127         VREG_INFO(VSIM,  PCAP_REG_AUXVREG, 17, 18, NA, 6),
 128         VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
 129         VREG_INFO(VVIB,  PCAP_REG_AUXVREG, 19, 20, NA, NA),
 130
 131         VREG_INFO(SW1,   PCAP_REG_SWCTRL,  1,  2,  NA, NA),
 132         VREG_INFO(SW2,   PCAP_REG_SWCTRL,  6,  7,  NA, NA),
 133         /* SW3 STBY is on PCAP_REG_AUXVREG */
 134         VREG_INFO(SW3,   PCAP_REG_SWCTRL,  11, 12, 24, NA),
 135
 136         /* SWxS used to control SWx voltage on standby */
 137 /*      VREG_INFO(SW1S,  PCAP_REG_LOWPWR,  NA, 12, NA, NA),
 138         VREG_INFO(SW2S,  PCAP_REG_LOWPWR,  NA, 20, NA, NA), */
 139 };
 140
 141 static int pcap_regulator_set_voltage_sel(struct regulator_dev *rdev,
 142                                           unsigned selector)
 143 {
 144         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 145         void *pcap = rdev_get_drvdata(rdev);
 146
 147         /* the regulator doesn't support voltage switching */
 148         if (rdev->desc->n_voltages == 1)
 149                 return -EINVAL;
 150
 151         return ezx_pcap_set_bits(pcap, vreg->reg,
 152                                  (rdev->desc->n_voltages - 1) << vreg->index,
 153                                  selector << vreg->index);
 154 }
 155
 156 static int pcap_regulator_get_voltage_sel(struct regulator_dev *rdev)
 157 {
 158         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 159         void *pcap = rdev_get_drvdata(rdev);
 160         u32 tmp;
 161
 162         if (rdev->desc->n_voltages == 1)
 163                 return 0;
 164
 165         ezx_pcap_read(pcap, vreg->reg, &tmp);
 166         tmp = ((tmp >> vreg->index) & (rdev->desc->n_voltages - 1));
 167         return tmp;
 168 }
 169
 170 static int pcap_regulator_enable(struct regulator_dev *rdev)
 171 {
 172         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 173         void *pcap = rdev_get_drvdata(rdev);
 174
 175         if (vreg->en == NA)
 176                 return -EINVAL;
 177
 178         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
 179 }
 180
 181 static int pcap_regulator_disable(struct regulator_dev *rdev)
 182 {
 183         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 184         void *pcap = rdev_get_drvdata(rdev);
 185
 186         if (vreg->en == NA)
 187                 return -EINVAL;
 188
 189         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
 190 }
 191
 192 static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
 193 {
 194         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
 195         void *pcap = rdev_get_drvdata(rdev);
 196         u32 tmp;
 197
 198         if (vreg->en == NA)
 199                 return -EINVAL;
 200
 201         ezx_pcap_read(pcap, vreg->reg, &tmp);
 202         return (tmp >> vreg->en) & 1;
 203 }
 204
 205 static const struct regulator_ops pcap_regulator_ops = {
 206         .list_voltage   = regulator_list_voltage_table,
 207         .set_voltage_sel = pcap_regulator_set_voltage_sel,
 208         .get_voltage_sel = pcap_regulator_get_voltage_sel,
 209         .enable         = pcap_regulator_enable,
 210         .disable        = pcap_regulator_disable,
 211         .is_enabled     = pcap_regulator_is_enabled,
 212 };
 213
 214 #define VREG(_vreg)                                             \
 215         [_vreg] = {                                             \
 216                 .name           = #_vreg,                       \
 217                 .id             = _vreg,                        \
 218                 .n_voltages     = ARRAY_SIZE(_vreg##_table),    \
 219                 .volt_table     = _vreg##_table,                \
 220                 .ops            = &pcap_regulator_ops,          \
 221                 .type           = REGULATOR_VOLTAGE,            \
 222                 .owner          = THIS_MODULE,                  \
 223         }
 224
 225 static const struct regulator_desc pcap_regulators[] = {
 226         VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
 227         VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
 228         VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
 229 };
 230
 231 static int pcap_regulator_probe(struct platform_device *pdev)
 232 {
 233         struct regulator_dev *rdev;
 234         void *pcap = dev_get_drvdata(pdev->dev.parent);
 235         struct regulator_config config = { };
 236
 237         config.dev = &pdev->dev;
 238         config.init_data = dev_get_platdata(&pdev->dev);
 239         config.driver_data = pcap;
 240
 241         rdev = devm_regulator_register(&pdev->dev, &pcap_regulators[pdev->id],
 242                                        &config);
 243         if (IS_ERR(rdev))
 244                 return PTR_ERR(rdev);
 245
 246         platform_set_drvdata(pdev, rdev);
 247
 248         return 0;
 249 }
 250
 251 static struct platform_driver pcap_regulator_driver = {
 252         .driver = {
 253                 .name   = "pcap-regulator",
 254                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 255         },
 256         .probe  = pcap_regulator_probe,
 257 };
 258
 259 static int __init pcap_regulator_init(void)
 260 {
 261         return platform_driver_register(&pcap_regulator_driver);
 262 }
 263
 264 static void __exit pcap_regulator_exit(void)
 265 {
 266         platform_driver_unregister(&pcap_regulator_driver);
 267 }
 268
 269 subsys_initcall(pcap_regulator_init);
 270 module_exit(pcap_regulator_exit);
 271
 272 MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
 273 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
 274 MODULE_LICENSE("GPL");