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         unsigned int            max_uV;
  26 };
  27
  28 struct as3711_regulator {
  29         struct as3711_regulator_info *reg_info;
  30         struct regulator_dev *rdev;
  31 };
  32
  33 /*
  34  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
  35  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
  36  * FAST:        sdX_fast=1
  37  * NORMAL:      low_noise=1
  38  * IDLE:        low_noise=0
  39  */
  40
  41 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
  42 {
  43         unsigned int fast_bit = rdev->desc->enable_mask,
  44                 low_noise_bit = fast_bit << 4;
  45         u8 val;
  46
  47         switch (mode) {
  48         case REGULATOR_MODE_FAST:
  49                 val = fast_bit | low_noise_bit;
  50                 break;
  51         case REGULATOR_MODE_NORMAL:
  52                 val = low_noise_bit;
  53                 break;
  54         case REGULATOR_MODE_IDLE:
  55                 val = 0;
  56                 break;
  57         default:
  58                 return -EINVAL;
  59         }
  60
  61         return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
  62                                   low_noise_bit | fast_bit, val);
  63 }
  64
  65 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
  66 {
  67         unsigned int fast_bit = rdev->desc->enable_mask,
  68                 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
  69         unsigned int val;
  70         int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
  71
  72         if (ret < 0)
  73                 return ret;
  74
  75         if ((val & mask) == mask)
  76                 return REGULATOR_MODE_FAST;
  77
  78         if ((val & mask) == low_noise_bit)
  79                 return REGULATOR_MODE_NORMAL;
  80
  81         if (!(val & mask))
  82                 return REGULATOR_MODE_IDLE;
  83
  84         return -EINVAL;
  85 }
  86
  87 static struct regulator_ops as3711_sd_ops = {
  88         .is_enabled             = regulator_is_enabled_regmap,
  89         .enable                 = regulator_enable_regmap,
  90         .disable                = regulator_disable_regmap,
  91         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  92         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  93         .list_voltage           = regulator_list_voltage_linear_range,
  94         .map_voltage            = regulator_map_voltage_linear_range,
  95         .get_mode               = as3711_get_mode_sd,
  96         .set_mode               = as3711_set_mode_sd,
  97 };
  98
  99 static struct regulator_ops as3711_aldo_ops = {
 100         .is_enabled             = regulator_is_enabled_regmap,
 101         .enable                 = regulator_enable_regmap,
 102         .disable                = regulator_disable_regmap,
 103         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 104         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 105         .list_voltage           = regulator_list_voltage_linear_range,
 106         .map_voltage            = regulator_map_voltage_linear_range,
 107 };
 108
 109 static struct regulator_ops as3711_dldo_ops = {
 110         .is_enabled             = regulator_is_enabled_regmap,
 111         .enable                 = regulator_enable_regmap,
 112         .disable                = regulator_disable_regmap,
 113         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 114         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 115         .list_voltage           = regulator_list_voltage_linear_range,
 116         .map_voltage            = regulator_map_voltage_linear_range,
 117 };
 118
 119 static const struct regulator_linear_range as3711_sd_ranges[] = {
 120         REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
 121         REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
 122         REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
 123 };
 124
 125 static const struct regulator_linear_range as3711_aldo_ranges[] = {
 126         REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
 127         REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
 128 };
 129
 130 static const struct regulator_linear_range as3711_dldo_ranges[] = {
 131         REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
 132         REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
 133 };
 134
 135 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)      \
 136         [AS3711_REGULATOR_ ## _id] = {                                                  \
 137         .desc = {                                                                       \
 138                 .name = "as3711-regulator-" # _id,                                      \
 139                 .id = AS3711_REGULATOR_ ## _id,                                         \
 140                 .n_voltages = (_vmask + 1),                                             \
 141                 .ops = &as3711_ ## _sfx ## _ops,                                        \
 142                 .type = REGULATOR_VOLTAGE,                                              \
 143                 .owner = THIS_MODULE,                                                   \
 144                 .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                                 \
 145                 .vsel_mask = _vmask << _vshift,                                         \
 146                 .enable_reg = AS3711_ ## _en_reg,                                       \
 147                 .enable_mask = BIT(_en_bit),                                            \
 148                 .min_uV = _min_uV,                                                      \
 149                 .linear_ranges = as3711_ ## _sfx ## _ranges,                            \
 150                 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges),              \
 151         },                                                                              \
 152         .max_uV = _max_uV,                                                              \
 153 }
 154
 155 static struct as3711_regulator_info as3711_reg_info[] = {
 156         AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
 157         AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
 158         AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
 159         AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
 160         AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 161         AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 162         AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 163         AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 164         AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 165         AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 166         AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 167         AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 168         /* StepUp output voltage depends on supplying regulator */
 169 };
 170
 171 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
 172
 173 static struct of_regulator_match
 174 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
 175         [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
 176         [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
 177         [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
 178         [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
 179         [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
 180         [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
 181         [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
 182         [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
 183         [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
 184         [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
 185         [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
 186         [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
 187 };
 188
 189 static int as3711_regulator_parse_dt(struct device *dev,
 190                                 struct device_node **of_node, const int count)
 191 {
 192         struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
 193         struct device_node *regulators =
 194                 of_find_node_by_name(dev->parent->of_node, "regulators");
 195         struct of_regulator_match *match;
 196         int ret, i;
 197
 198         if (!regulators) {
 199                 dev_err(dev, "regulator node not found\n");
 200                 return -ENODEV;
 201         }
 202
 203         ret = of_regulator_match(dev->parent, regulators,
 204                                  as3711_regulator_matches, count);
 205         of_node_put(regulators);
 206         if (ret < 0) {
 207                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
 208                 return ret;
 209         }
 210
 211         for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
 212                 if (match->of_node) {
 213                         pdata->init_data[i] = match->init_data;
 214                         of_node[i] = match->of_node;
 215                 }
 216
 217         return 0;
 218 }
 219
 220 static int as3711_regulator_probe(struct platform_device *pdev)
 221 {
 222         struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
 223         struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
 224         struct regulator_init_data *reg_data;
 225         struct regulator_config config = {.dev = &pdev->dev,};
 226         struct as3711_regulator *reg = NULL;
 227         struct as3711_regulator *regs;
 228         struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
 229         struct regulator_dev *rdev;
 230         struct as3711_regulator_info *ri;
 231         int ret;
 232         int id;
 233
 234         if (!pdata) {
 235                 dev_err(&pdev->dev, "No platform data...\n");
 236                 return -ENODEV;
 237         }
 238
 239         if (pdev->dev.parent->of_node) {
 240                 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
 241                 if (ret < 0) {
 242                         dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
 243                         return ret;
 244                 }
 245         }
 246
 247         regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
 248                         sizeof(struct as3711_regulator), GFP_KERNEL);
 249         if (!regs) {
 250                 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 251                 return -ENOMEM;
 252         }
 253
 254         for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
 255                 reg_data = pdata->init_data[id];
 256
 257                 /* No need to register if there is no regulator data */
 258                 if (!reg_data)
 259                         continue;
 260
 261                 reg = &regs[id];
 262                 reg->reg_info = ri;
 263
 264                 config.init_data = reg_data;
 265                 config.driver_data = reg;
 266                 config.regmap = as3711->regmap;
 267                 config.of_node = of_node[id];
 268
 269                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 270                 if (IS_ERR(rdev)) {
 271                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 272                                 ri->desc.name);
 273                         return PTR_ERR(rdev);
 274                 }
 275                 reg->rdev = rdev;
 276         }
 277         platform_set_drvdata(pdev, regs);
 278         return 0;
 279 }
 280
 281 static struct platform_driver as3711_regulator_driver = {
 282         .driver = {
 283                 .name   = "as3711-regulator",
 284                 .owner  = THIS_MODULE,
 285         },
 286         .probe          = as3711_regulator_probe,
 287 };
 288
 289 static int __init as3711_regulator_init(void)
 290 {
 291         return platform_driver_register(&as3711_regulator_driver);
 292 }
 293 subsys_initcall(as3711_regulator_init);
 294
 295 static void __exit as3711_regulator_exit(void)
 296 {
 297         platform_driver_unregister(&as3711_regulator_driver);
 298 }
 299 module_exit(as3711_regulator_exit);
 300
 301 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 302 MODULE_DESCRIPTION("AS3711 regulator driver");
 303 MODULE_ALIAS("platform:as3711-regulator");
 304 MODULE_LICENSE("GPL v2");