drivers/regulator/tps65132-regulator.c

   1 /*
   2  * TI TPS65132 Regulator driver
   3  *
   4  * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
   5  *
   6  * Author: Venkat Reddy Talla <vreddytalla@nvidia.com>
   7  *              Laxman Dewangan <ldewangan@nvidia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  15  * whether express or implied; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  */
  19
  20 #include <linux/delay.h>
  21 #include <linux/err.h>
  22 #include <linux/gpio/consumer.h>
  23 #include <linux/i2c.h>
  24 #include <linux/module.h>
  25 #include <linux/regmap.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/machine.h>
  28
  29 #define TPS65132_REG_VPOS               0x00
  30 #define TPS65132_REG_VNEG               0x01
  31 #define TPS65132_REG_APPS_DISP_DISN     0x03
  32 #define TPS65132_REG_CONTROL            0x0FF
  33
  34 #define TPS65132_VOUT_MASK              0x1F
  35 #define TPS65132_VOUT_N_VOLTAGE         0x15
  36 #define TPS65132_VOUT_VMIN              4000000
  37 #define TPS65132_VOUT_VMAX              6000000
  38 #define TPS65132_VOUT_STEP              100000
  39
  40 #define TPS65132_REG_APPS_DIS_VPOS              BIT(0)
  41 #define TPS65132_REG_APPS_DIS_VNEG              BIT(1)
  42
  43 #define TPS65132_REGULATOR_ID_VPOS      0
  44 #define TPS65132_REGULATOR_ID_VNEG      1
  45 #define TPS65132_MAX_REGULATORS         2
  46
  47 #define TPS65132_ACT_DIS_TIME_SLACK             1000
  48
  49 struct tps65132_reg_pdata {
  50         struct gpio_desc *en_gpiod;
  51         struct gpio_desc *act_dis_gpiod;
  52         unsigned int act_dis_time_us;
  53         int ena_gpio_state;
  54 };
  55
  56 struct tps65132_regulator {
  57         struct device *dev;
  58         struct regmap *rmap;
  59         struct regulator_desc *rdesc[TPS65132_MAX_REGULATORS];
  60         struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
  61         struct regulator_dev *rdev[TPS65132_MAX_REGULATORS];
  62 };
  63
  64 static int tps65132_regulator_enable(struct regulator_dev *rdev)
  65 {
  66         struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
  67         int id = rdev_get_id(rdev);
  68         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
  69         int ret;
  70
  71         if (!IS_ERR(rpdata->en_gpiod)) {
  72                 gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
  73                 rpdata->ena_gpio_state = 1;
  74         }
  75
  76         /* Hardware automatically enable discharge bit in enable */
  77         if (rdev->constraints->active_discharge ==
  78                         REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
  79                 ret = regulator_set_active_discharge_regmap(rdev, false);
  80                 if (ret < 0) {
  81                         dev_err(tps->dev, "Failed to disable active discharge: %d\n",
  82                                 ret);
  83                         return ret;
  84                 }
  85         }
  86
  87         return 0;
  88 }
  89
  90 static int tps65132_regulator_disable(struct regulator_dev *rdev)
  91 {
  92         struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
  93         int id = rdev_get_id(rdev);
  94         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
  95
  96         if (!IS_ERR(rpdata->en_gpiod)) {
  97                 gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
  98                 rpdata->ena_gpio_state = 0;
  99         }
 100
 101         if (!IS_ERR(rpdata->act_dis_gpiod)) {
 102                 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
 103                 usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
 104                              TPS65132_ACT_DIS_TIME_SLACK);
 105                 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
 112 {
 113         struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
 114         int id = rdev_get_id(rdev);
 115         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
 116
 117         if (!IS_ERR(rpdata->en_gpiod))
 118                 return rpdata->ena_gpio_state;
 119
 120         return 1;
 121 }
 122
 123 static struct regulator_ops tps65132_regulator_ops = {
 124         .enable = tps65132_regulator_enable,
 125         .disable = tps65132_regulator_disable,
 126         .is_enabled = tps65132_regulator_is_enabled,
 127         .list_voltage = regulator_list_voltage_linear,
 128         .map_voltage = regulator_map_voltage_linear,
 129         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 130         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 131         .set_active_discharge = regulator_set_active_discharge_regmap,
 132 };
 133
 134 static int tps65132_of_parse_cb(struct device_node *np,
 135                                 const struct regulator_desc *desc,
 136                                 struct regulator_config *config)
 137 {
 138         struct tps65132_regulator *tps = config->driver_data;
 139         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
 140         int ret;
 141
 142         rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev,
 143                                         "enable", 0, &np->fwnode, 0, "enable");
 144         if (IS_ERR(rpdata->en_gpiod)) {
 145                 ret = PTR_ERR(rpdata->en_gpiod);
 146
 147                 /* Ignore the error other than probe defer */
 148                 if (ret == -EPROBE_DEFER)
 149                         return ret;
 150                 return 0;
 151         }
 152
 153         rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child(
 154                                         tps->dev, "active-discharge", 0,
 155                                         &np->fwnode, 0, "active-discharge");
 156         if (IS_ERR(rpdata->act_dis_gpiod)) {
 157                 ret = PTR_ERR(rpdata->act_dis_gpiod);
 158
 159                 /* Ignore the error other than probe defer */
 160                 if (ret == -EPROBE_DEFER)
 161                         return ret;
 162
 163                 return 0;
 164         }
 165
 166         ret = of_property_read_u32(np, "ti,active-discharge-time-us",
 167                                    &rpdata->act_dis_time_us);
 168         if (ret < 0) {
 169                 dev_err(tps->dev, "Failed to read active discharge time:%d\n",
 170                         ret);
 171                 return ret;
 172         }
 173
 174         return 0;
 175 }
 176
 177 #define TPS65132_REGULATOR_DESC(_id, _name)             \
 178         [TPS65132_REGULATOR_ID_##_id] = {               \
 179                 .name = "tps65132-"#_name,              \
 180                 .supply_name = "vin",                   \
 181                 .id = TPS65132_REGULATOR_ID_##_id,      \
 182                 .of_match = of_match_ptr(#_name),       \
 183                 .of_parse_cb    = tps65132_of_parse_cb, \
 184                 .ops = &tps65132_regulator_ops,         \
 185                 .n_voltages = TPS65132_VOUT_N_VOLTAGE,  \
 186                 .min_uV = TPS65132_VOUT_VMIN,           \
 187                 .uV_step = TPS65132_VOUT_STEP,          \
 188                 .enable_time = 500,                     \
 189                 .vsel_mask = TPS65132_VOUT_MASK,        \
 190                 .vsel_reg = TPS65132_REG_##_id,         \
 191                 .active_discharge_off = 0,                      \
 192                 .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
 193                 .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
 194                 .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
 195                 .type = REGULATOR_VOLTAGE,              \
 196                 .owner = THIS_MODULE,                   \
 197         }
 198
 199 static struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
 200         TPS65132_REGULATOR_DESC(VPOS, outp),
 201         TPS65132_REGULATOR_DESC(VNEG, outn),
 202 };
 203
 204 static const struct regmap_range tps65132_no_reg_ranges[] = {
 205         regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
 206                          TPS65132_REG_CONTROL - 1),
 207 };
 208
 209 static const struct regmap_access_table tps65132_no_reg_table = {
 210         .no_ranges = tps65132_no_reg_ranges,
 211         .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
 212 };
 213
 214 static const struct regmap_config tps65132_regmap_config = {
 215         .reg_bits       = 8,
 216         .val_bits       = 8,
 217         .max_register   = TPS65132_REG_CONTROL,
 218         .cache_type     = REGCACHE_NONE,
 219         .rd_table       = &tps65132_no_reg_table,
 220         .wr_table       = &tps65132_no_reg_table,
 221 };
 222
 223 static int tps65132_probe(struct i2c_client *client,
 224                           const struct i2c_device_id *client_id)
 225 {
 226         struct device *dev = &client->dev;
 227         struct tps65132_regulator *tps;
 228         struct regulator_config config = { };
 229         int id;
 230         int ret;
 231
 232         tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
 233         if (!tps)
 234                 return -ENOMEM;
 235
 236         tps->rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
 237         if (IS_ERR(tps->rmap)) {
 238                 ret = PTR_ERR(tps->rmap);
 239                 dev_err(dev, "regmap init failed: %d\n", ret);
 240                 return ret;
 241         }
 242
 243         i2c_set_clientdata(client, tps);
 244         tps->dev = dev;
 245
 246         for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
 247                 tps->rdesc[id] = &tps_regs_desc[id];
 248
 249                 config.regmap = tps->rmap;
 250                 config.dev = dev;
 251                 config.driver_data = tps;
 252
 253                 tps->rdev[id] = devm_regulator_register(dev,
 254                                         tps->rdesc[id], &config);
 255                 if (IS_ERR(tps->rdev[id])) {
 256                         ret = PTR_ERR(tps->rdev[id]);
 257                         dev_err(dev, "regulator %s register failed: %d\n",
 258                                 tps->rdesc[id]->name, ret);
 259                         return ret;
 260                 }
 261         }
 262         return 0;
 263 }
 264
 265 static const struct i2c_device_id tps65132_id[] = {
 266         {.name = "tps65132",},
 267         {},
 268 };
 269 MODULE_DEVICE_TABLE(i2c, tps65132_id);
 270
 271 static struct i2c_driver tps65132_i2c_driver = {
 272         .driver = {
 273                 .name = "tps65132",
 274         },
 275         .probe = tps65132_probe,
 276         .id_table = tps65132_id,
 277 };
 278
 279 module_i2c_driver(tps65132_i2c_driver);
 280
 281 MODULE_DESCRIPTION("tps65132 regulator driver");
 282 MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
 283 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 284 MODULE_LICENSE("GPL v2");