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                 .owner = THIS_MODULE,
  86         },
  87         {
  88                 .name = "LDO2",
  89                 .id = 2,
  90                 .type = REGULATOR_VOLTAGE,
  91                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
  92                 .vsel_reg = WM8994_LDO_2,
  93                 .vsel_mask = WM8994_LDO2_VSEL_MASK,
  94                 .ops = &wm8994_ldo2_ops,
  95                 .enable_time = 3000,
  96                 .owner = THIS_MODULE,
  97         },
  98 };
  99
 100 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
 101         { .supply = "AVDD1" },
 102         { .supply = "DCVDD" },
 103 };
 104
 105 static const struct regulator_init_data wm8994_ldo_default[] = {
 106         {
 107                 .constraints = {
 108                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 109                 },
 110                 .num_consumer_supplies = 1,
 111         },
 112         {
 113                 .constraints = {
 114                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
 115                 },
 116                 .num_consumer_supplies = 1,
 117         },
 118 };
 119
 120 static int wm8994_ldo_probe(struct platform_device *pdev)
 121 {
 122         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
 123         struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
 124         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
 125         struct regulator_config config = { };
 126         struct wm8994_ldo *ldo;
 127         struct gpio_desc *gpiod;
 128         int ret;
 129
 130         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 131
 132         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
 133         if (!ldo)
 134                 return -ENOMEM;
 135
 136         ldo->wm8994 = wm8994;
 137         ldo->supply = wm8994_ldo_consumer[id];
 138         ldo->supply.dev_name = dev_name(wm8994->dev);
 139
 140         config.dev = wm8994->dev;
 141         config.driver_data = ldo;
 142         config.regmap = wm8994->regmap;
 143         config.init_data = &ldo->init_data;
 144
 145         /*
 146          * Look up LDO enable GPIO from the parent device node, we don't
 147          * use devm because the regulator core will free the GPIO
 148          */
 149         gpiod = gpiod_get_optional(pdev->dev.parent,
 150                                    id ? "wlf,ldo2ena" : "wlf,ldo1ena",
 151                                    GPIOD_OUT_LOW |
 152                                    GPIOD_FLAGS_BIT_NONEXCLUSIVE);
 153         if (IS_ERR(gpiod))
 154                 return PTR_ERR(gpiod);
 155         config.ena_gpiod = gpiod;
 156
 157         /* Use default constraints if none set up */
 158         if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
 159                 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
 160                         ldo->supply.dev_name, ldo->supply.supply);
 161
 162                 ldo->init_data = wm8994_ldo_default[id];
 163                 ldo->init_data.consumer_supplies = &ldo->supply;
 164                 if (!gpiod)
 165                         ldo->init_data.constraints.valid_ops_mask = 0;
 166         } else {
 167                 ldo->init_data = *pdata->ldo[id].init_data;
 168         }
 169
 170         /*
 171          * At this point the GPIO descriptor is handled over to the
 172          * regulator core and we need not worry about it on the
 173          * error path.
 174          */
 175         ldo->regulator = devm_regulator_register(&pdev->dev,
 176                                                  &wm8994_ldo_desc[id],
 177                                                  &config);
 178         if (IS_ERR(ldo->regulator)) {
 179                 ret = PTR_ERR(ldo->regulator);
 180                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
 181                         id + 1, ret);
 182                 return ret;
 183         }
 184
 185         platform_set_drvdata(pdev, ldo);
 186
 187         return 0;
 188 }
 189
 190 static struct platform_driver wm8994_ldo_driver = {
 191         .probe = wm8994_ldo_probe,
 192         .driver         = {
 193                 .name   = "wm8994-ldo",
 194         },
 195 };
 196
 197 module_platform_driver(wm8994_ldo_driver);
 198
 199 /* Module information */
 200 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 201 MODULE_DESCRIPTION("WM8994 LDO driver");
 202 MODULE_LICENSE("GPL");
 203 MODULE_ALIAS("platform:wm8994-ldo");