drivers/regulator/wm8994-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // wm8994-regulator.c  --  Regulator driver for the WM8994
   4 //
   5 // Copyright 2009 Wolfson Microelectronics PLC.
   6 //
   7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/init.h>
  12 #include <linux/bitops.h>
  13 #include <linux/err.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/driver.h>
  16 #include <linux/regulator/machine.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/slab.h>
  19
  20 #include <linux/mfd/wm8994/core.h>
  21 #include <linux/mfd/wm8994/registers.h>
  22 #include <linux/mfd/wm8994/pdata.h>
  23
  24 struct wm8994_ldo {
  25         struct regulator_dev *regulator;
  26         struct wm8994 *wm8994;
  27         struct regulator_consumer_supply supply;
  28         struct regulator_init_data init_data;
  29 };
  30
  31 #define WM8994_LDO1_MAX_SELECTOR 0x7
  32 #define WM8994_LDO2_MAX_SELECTOR 0x3
  33
  34 static const struct regulator_ops wm8994_ldo1_ops = {
  35         .list_voltage = regulator_list_voltage_linear,
  36         .map_voltage = regulator_map_voltage_linear,
  37         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  38         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  39 };
  40
  41 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
  42                                     unsigned int selector)
  43 {
  44         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
  45
  46         if (selector > WM8994_LDO2_MAX_SELECTOR)
  47                 return -EINVAL;
  48
  49         switch (ldo->wm8994->type) {
  50         case WM8994:
  51                 return (selector * 100000) + 900000;
  52         case WM8958:
  53                 return (selector * 100000) + 1000000;
  54         case WM1811:
  55                 switch (selector) {
  56                 case 0:
  57                         return -EINVAL;
  58                 default:
  59                         return (selector * 100000) + 950000;
  60                 }
  61                 break;
  62         default:
  63                 return -EINVAL;
  64         }
  65 }
  66
  67 static const struct regulator_ops wm8994_ldo2_ops = {
  68         .list_voltage = wm8994_ldo2_list_voltage,
  69         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  70         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  71 };
  72
  73 static const struct regulator_desc wm8994_ldo_desc[] = {
  74         {
  75                 .name = "LDO1",
  76                 .id = 1,
  77                 .type = REGULATOR_VOLTAGE,
  78                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
  79                 .vsel_reg = WM8994_LDO_1,
  80                 .vsel_mask = WM8994_LDO1_VSEL_MASK,
  81                 .ops = &wm8994_ldo1_ops,
  82                 .min_uV = 2400000,
  83                 .uV_step = 100000,
  84                 .enable_time = 3000,
  85                 .off_on_delay = 36000,
  86                 .owner = THIS_MODULE,
  87         },
  88         {
  89                 .name = "LDO2",
  90                 .id = 2,
  91                 .type = REGULATOR_VOLTAGE,
  92                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
  93                 .vsel_reg = WM8994_LDO_2,
  94                 .vsel_mask = WM8994_LDO2_VSEL_MASK,
  95                 .ops = &wm8994_ldo2_ops,
  96                 .enable_time = 3000,
  97                 .off_on_delay = 36000,
  98                 .owner = THIS_MODULE,
  99         },
 100 };
 101
 102 static const struct regulator_desc wm8958_ldo_desc[] = {
 103         {
 104                 .name = "LDO1",
 105                 .id = 1,
 106                 .type = REGULATOR_VOLTAGE,
 107                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
 108                 .vsel_reg = WM8994_LDO_1,
 109                 .vsel_mask = WM8994_LDO1_VSEL_MASK,
 110                 .ops = &wm8994_ldo1_ops,
 111                 .min_uV = 2400000,
 112                 .uV_step = 100000,
 113                 .enable_time = 3000,
 114                 .owner = THIS_MODULE,
 115         },
 116         {
 117                 .name = "LDO2",
 118                 .id = 2,
 119                 .type = REGULATOR_VOLTAGE,
 120                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
 121                 .vsel_reg = WM8994_LDO_2,
 122                 .vsel_mask = WM8994_LDO2_VSEL_MASK,
 123                 .ops = &wm8994_ldo2_ops,
 124                 .enable_time = 3000,
 125                 .owner = THIS_MODULE,
 126         },
 127 };
 128
 129 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
 130         { .supply = "AVDD1" },
 131         { .supply = "DCVDD" },
 132 };
 133
 134 static const struct regulator_init_data wm8994_ldo_default[] = {
 135         {
 136                 .constraints = {
 137                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 138                 },
 139                 .num_consumer_supplies = 1,
 140         },
 141         {
 142                 .constraints = {
 143                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 144                 },
 145                 .num_consumer_supplies = 1,
 146         },
 147 };
 148
 149 static int wm8994_ldo_probe(struct platform_device *pdev)
 150 {
 151         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
 152         struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
 153         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 154         struct regulator_config config = { };
 155         struct wm8994_ldo *ldo;
 156         struct gpio_desc *gpiod;
 157         int ret;
 158
 159         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 160
 161         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
 162         if (!ldo)
 163                 return -ENOMEM;
 164
 165         ldo->wm8994 = wm8994;
 166         ldo->supply = wm8994_ldo_consumer[id];
 167         ldo->supply.dev_name = dev_name(wm8994->dev);
 168
 169         config.dev = wm8994->dev;
 170         config.driver_data = ldo;
 171         config.regmap = wm8994->regmap;
 172         config.init_data = &ldo->init_data;
 173
 174         /*
 175          * Look up LDO enable GPIO from the parent device node, we don't
 176          * use devm because the regulator core will free the GPIO
 177          */
 178         gpiod = gpiod_get_optional(pdev->dev.parent,
 179                                    id ? "wlf,ldo2ena" : "wlf,ldo1ena",
 180                                    GPIOD_OUT_LOW |
 181                                    GPIOD_FLAGS_BIT_NONEXCLUSIVE);
 182         if (IS_ERR(gpiod))
 183                 return PTR_ERR(gpiod);
 184         config.ena_gpiod = gpiod;
 185
 186         /* Use default constraints if none set up */
 187         if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
 188                 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
 189                         ldo->supply.dev_name, ldo->supply.supply);
 190
 191                 ldo->init_data = wm8994_ldo_default[id];
 192                 ldo->init_data.consumer_supplies = &ldo->supply;
 193                 if (!gpiod)
 194                         ldo->init_data.constraints.valid_ops_mask = 0;
 195         } else {
 196                 ldo->init_data = *pdata->ldo[id].init_data;
 197         }
 198
 199         /*
 200          * At this point the GPIO descriptor is handled over to the
 201          * regulator core and we need not worry about it on the
 202          * error path.
 203          */
 204         if (ldo->wm8994->type == WM8994) {
 205                 ldo->regulator = devm_regulator_register(&pdev->dev,
 206                                                          &wm8994_ldo_desc[id],
 207                                                          &config);
 208         } else {
 209                 ldo->regulator = devm_regulator_register(&pdev->dev,
 210                                                          &wm8958_ldo_desc[id],
 211                                                          &config);
 212         }
 213
 214         if (IS_ERR(ldo->regulator)) {
 215                 ret = PTR_ERR(ldo->regulator);
 216                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
 217                         id + 1, ret);
 218                 return ret;
 219         }
 220
 221         platform_set_drvdata(pdev, ldo);
 222
 223         return 0;
 224 }
 225
 226 static struct platform_driver wm8994_ldo_driver = {
 227         .probe = wm8994_ldo_probe,
 228         .driver         = {
 229                 .name   = "wm8994-ldo",
 230         },
 231 };
 232
 233 module_platform_driver(wm8994_ldo_driver);
 234
 235 /* Module information */
 236 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 237 MODULE_DESCRIPTION("WM8994 LDO driver");
 238 MODULE_LICENSE("GPL");
 239 MODULE_ALIAS("platform:wm8994-ldo");