drivers/regulator/as3711-regulator.c

   1 /*
   2  * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
   3  *
   4  * Copyright (C) 2012 Renesas Electronics Corporation
   5  * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/init.h>
  14 #include <linux/mfd/as3711.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/of_regulator.h>
  21 #include <linux/slab.h>
  22
  23 struct as3711_regulator_info {
  24         struct regulator_desc   desc;
  25 };
  26
  27 struct as3711_regulator {
  28         struct as3711_regulator_info *reg_info;
  29 };
  30
  31 /*
  32  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
  33  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
  34  * FAST:        sdX_fast=1
  35  * NORMAL:      low_noise=1
  36  * IDLE:        low_noise=0
  37  */
  38
  39 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
  40 {
  41         unsigned int fast_bit = rdev->desc->enable_mask,
  42                 low_noise_bit = fast_bit << 4;
  43         u8 val;
  44
  45         switch (mode) {
  46         case REGULATOR_MODE_FAST:
  47                 val = fast_bit | low_noise_bit;
  48                 break;
  49         case REGULATOR_MODE_NORMAL:
  50                 val = low_noise_bit;
  51                 break;
  52         case REGULATOR_MODE_IDLE:
  53                 val = 0;
  54                 break;
  55         default:
  56                 return -EINVAL;
  57         }
  58
  59         return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
  60                                   low_noise_bit | fast_bit, val);
  61 }
  62
  63 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
  64 {
  65         unsigned int fast_bit = rdev->desc->enable_mask,
  66                 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
  67         unsigned int val;
  68         int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
  69
  70         if (ret < 0)
  71                 return ret;
  72
  73         if ((val & mask) == mask)
  74                 return REGULATOR_MODE_FAST;
  75
  76         if ((val & mask) == low_noise_bit)
  77                 return REGULATOR_MODE_NORMAL;
  78
  79         if (!(val & mask))
  80                 return REGULATOR_MODE_IDLE;
  81
  82         return -EINVAL;
  83 }
  84
  85 static struct regulator_ops as3711_sd_ops = {
  86         .is_enabled             = regulator_is_enabled_regmap,
  87         .enable                 = regulator_enable_regmap,
  88         .disable                = regulator_disable_regmap,
  89         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  90         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  91         .list_voltage           = regulator_list_voltage_linear_range,
  92         .map_voltage            = regulator_map_voltage_linear_range,
  93         .get_mode               = as3711_get_mode_sd,
  94         .set_mode               = as3711_set_mode_sd,
  95 };
  96
  97 static struct regulator_ops as3711_aldo_ops = {
  98         .is_enabled             = regulator_is_enabled_regmap,
  99         .enable                 = regulator_enable_regmap,
 100         .disable                = regulator_disable_regmap,
 101         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 102         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 103         .list_voltage           = regulator_list_voltage_linear_range,
 104         .map_voltage            = regulator_map_voltage_linear_range,
 105 };
 106
 107 static struct regulator_ops as3711_dldo_ops = {
 108         .is_enabled             = regulator_is_enabled_regmap,
 109         .enable                 = regulator_enable_regmap,
 110         .disable                = regulator_disable_regmap,
 111         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 112         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 113         .list_voltage           = regulator_list_voltage_linear_range,
 114         .map_voltage            = regulator_map_voltage_linear_range,
 115 };
 116
 117 static const struct regulator_linear_range as3711_sd_ranges[] = {
 118         REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
 119         REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
 120         REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
 121 };
 122
 123 static const struct regulator_linear_range as3711_aldo_ranges[] = {
 124         REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
 125         REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
 126 };
 127
 128 static const struct regulator_linear_range as3711_dldo_ranges[] = {
 129         REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
 130         REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
 131 };
 132
 133 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx)                    \
 134         [AS3711_REGULATOR_ ## _id] = {                                     \
 135         .desc = {                                                          \
 136                 .name = "as3711-regulator-" # _id,                         \
 137                 .id = AS3711_REGULATOR_ ## _id,                            \
 138                 .n_voltages = (_vmask + 1),                                \
 139                 .ops = &as3711_ ## _sfx ## _ops,                           \
 140                 .type = REGULATOR_VOLTAGE,                                 \
 141                 .owner = THIS_MODULE,                                      \
 142                 .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                    \
 143                 .vsel_mask = _vmask,                                       \
 144                 .enable_reg = AS3711_ ## _en_reg,                          \
 145                 .enable_mask = BIT(_en_bit),                               \
 146                 .linear_ranges = as3711_ ## _sfx ## _ranges,               \
 147                 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
 148         },                                                                 \
 149 }
 150
 151 static struct as3711_regulator_info as3711_reg_info[] = {
 152         AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
 153         AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
 154         AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
 155         AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
 156         AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
 157         AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
 158         AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
 159         AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
 160         AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
 161         AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
 162         AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
 163         AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
 164         /* StepUp output voltage depends on supplying regulator */
 165 };
 166
 167 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
 168
 169 static struct of_regulator_match
 170 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
 171         [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
 172         [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
 173         [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
 174         [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
 175         [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
 176         [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
 177         [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
 178         [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
 179         [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
 180         [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
 181         [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
 182         [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
 183 };
 184
 185 static int as3711_regulator_parse_dt(struct device *dev,
 186                                 struct device_node **of_node, const int count)
 187 {
 188         struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
 189         struct device_node *regulators =
 190                 of_get_child_by_name(dev->parent->of_node, "regulators");
 191         struct of_regulator_match *match;
 192         int ret, i;
 193
 194         if (!regulators) {
 195                 dev_err(dev, "regulator node not found\n");
 196                 return -ENODEV;
 197         }
 198
 199         ret = of_regulator_match(dev->parent, regulators,
 200                                  as3711_regulator_matches, count);
 201         of_node_put(regulators);
 202         if (ret < 0) {
 203                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
 204                 return ret;
 205         }
 206
 207         for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
 208                 if (match->of_node) {
 209                         pdata->init_data[i] = match->init_data;
 210                         of_node[i] = match->of_node;
 211                 }
 212
 213         return 0;
 214 }
 215
 216 static int as3711_regulator_probe(struct platform_device *pdev)
 217 {
 218         struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
 219         struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
 220         struct regulator_config config = {.dev = &pdev->dev,};
 221         struct as3711_regulator *reg = NULL;
 222         struct as3711_regulator *regs;
 223         struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
 224         struct regulator_dev *rdev;
 225         struct as3711_regulator_info *ri;
 226         int ret;
 227         int id;
 228
 229         if (!pdata) {
 230                 dev_err(&pdev->dev, "No platform data...\n");
 231                 return -ENODEV;
 232         }
 233
 234         if (pdev->dev.parent->of_node) {
 235                 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
 236                 if (ret < 0) {
 237                         dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
 238                         return ret;
 239                 }
 240         }
 241
 242         regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
 243                         sizeof(struct as3711_regulator), GFP_KERNEL);
 244         if (!regs)
 245                 return -ENOMEM;
 246
 247         for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
 248                 reg = &regs[id];
 249                 reg->reg_info = ri;
 250
 251                 config.init_data = pdata->init_data[id];
 252                 config.driver_data = reg;
 253                 config.regmap = as3711->regmap;
 254                 config.of_node = of_node[id];
 255
 256                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 257                 if (IS_ERR(rdev)) {
 258                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 259                                 ri->desc.name);
 260                         return PTR_ERR(rdev);
 261                 }
 262         }
 263         platform_set_drvdata(pdev, regs);
 264         return 0;
 265 }
 266
 267 static struct platform_driver as3711_regulator_driver = {
 268         .driver = {
 269                 .name   = "as3711-regulator",
 270         },
 271         .probe          = as3711_regulator_probe,
 272 };
 273
 274 static int __init as3711_regulator_init(void)
 275 {
 276         return platform_driver_register(&as3711_regulator_driver);
 277 }
 278 subsys_initcall(as3711_regulator_init);
 279
 280 static void __exit as3711_regulator_exit(void)
 281 {
 282         platform_driver_unregister(&as3711_regulator_driver);
 283 }
 284 module_exit(as3711_regulator_exit);
 285
 286 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 287 MODULE_DESCRIPTION("AS3711 regulator driver");
 288 MODULE_ALIAS("platform:as3711-regulator");
 289 MODULE_LICENSE("GPL v2");