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 tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
  59 };
  60
  61 static int tps65132_regulator_enable(struct regulator_dev *rdev)
  62 {
  63         struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
  64         int id = rdev_get_id(rdev);
  65         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
  66         int ret;
  67
  68         if (!IS_ERR(rpdata->en_gpiod)) {
  69                 gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
  70                 rpdata->ena_gpio_state = 1;
  71         }
  72
  73         /* Hardware automatically enable discharge bit in enable */
  74         if (rdev->constraints->active_discharge ==
  75                         REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
  76                 ret = regulator_set_active_discharge_regmap(rdev, false);
  77                 if (ret < 0) {
  78                         dev_err(tps->dev, "Failed to disable active discharge: %d\n",
  79                                 ret);
  80                         return ret;
  81                 }
  82         }
  83
  84         return 0;
  85 }
  86
  87 static int tps65132_regulator_disable(struct regulator_dev *rdev)
  88 {
  89         struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
  90         int id = rdev_get_id(rdev);
  91         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
  92
  93         if (!IS_ERR(rpdata->en_gpiod)) {
  94                 gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
  95                 rpdata->ena_gpio_state = 0;
  96         }
  97
  98         if (!IS_ERR(rpdata->act_dis_gpiod)) {
  99                 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
 100                 usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
 101                              TPS65132_ACT_DIS_TIME_SLACK);
 102                 gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
 109 {
 110         struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
 111         int id = rdev_get_id(rdev);
 112         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
 113
 114         if (!IS_ERR(rpdata->en_gpiod))
 115                 return rpdata->ena_gpio_state;
 116
 117         return 1;
 118 }
 119
 120 static const struct regulator_ops tps65132_regulator_ops = {
 121         .enable = tps65132_regulator_enable,
 122         .disable = tps65132_regulator_disable,
 123         .is_enabled = tps65132_regulator_is_enabled,
 124         .list_voltage = regulator_list_voltage_linear,
 125         .map_voltage = regulator_map_voltage_linear,
 126         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 127         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 128         .set_active_discharge = regulator_set_active_discharge_regmap,
 129 };
 130
 131 static int tps65132_of_parse_cb(struct device_node *np,
 132                                 const struct regulator_desc *desc,
 133                                 struct regulator_config *config)
 134 {
 135         struct tps65132_regulator *tps = config->driver_data;
 136         struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
 137         int ret;
 138
 139         rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev,
 140                                         "enable", 0, &np->fwnode, 0, "enable");
 141         if (IS_ERR(rpdata->en_gpiod)) {
 142                 ret = PTR_ERR(rpdata->en_gpiod);
 143
 144                 /* Ignore the error other than probe defer */
 145                 if (ret == -EPROBE_DEFER)
 146                         return ret;
 147                 return 0;
 148         }
 149
 150         rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child(
 151                                         tps->dev, "active-discharge", 0,
 152                                         &np->fwnode, 0, "active-discharge");
 153         if (IS_ERR(rpdata->act_dis_gpiod)) {
 154                 ret = PTR_ERR(rpdata->act_dis_gpiod);
 155
 156                 /* Ignore the error other than probe defer */
 157                 if (ret == -EPROBE_DEFER)
 158                         return ret;
 159
 160                 return 0;
 161         }
 162
 163         ret = of_property_read_u32(np, "ti,active-discharge-time-us",
 164                                    &rpdata->act_dis_time_us);
 165         if (ret < 0) {
 166                 dev_err(tps->dev, "Failed to read active discharge time:%d\n",
 167                         ret);
 168                 return ret;
 169         }
 170
 171         return 0;
 172 }
 173
 174 #define TPS65132_REGULATOR_DESC(_id, _name)             \
 175         [TPS65132_REGULATOR_ID_##_id] = {               \
 176                 .name = "tps65132-"#_name,              \
 177                 .supply_name = "vin",                   \
 178                 .id = TPS65132_REGULATOR_ID_##_id,      \
 179                 .of_match = of_match_ptr(#_name),       \
 180                 .of_parse_cb    = tps65132_of_parse_cb, \
 181                 .ops = &tps65132_regulator_ops,         \
 182                 .n_voltages = TPS65132_VOUT_N_VOLTAGE,  \
 183                 .min_uV = TPS65132_VOUT_VMIN,           \
 184                 .uV_step = TPS65132_VOUT_STEP,          \
 185                 .enable_time = 500,                     \
 186                 .vsel_mask = TPS65132_VOUT_MASK,        \
 187                 .vsel_reg = TPS65132_REG_##_id,         \
 188                 .active_discharge_off = 0,                      \
 189                 .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
 190                 .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
 191                 .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
 192                 .type = REGULATOR_VOLTAGE,              \
 193                 .owner = THIS_MODULE,                   \
 194         }
 195
 196 static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
 197         TPS65132_REGULATOR_DESC(VPOS, outp),
 198         TPS65132_REGULATOR_DESC(VNEG, outn),
 199 };
 200
 201 static const struct regmap_range tps65132_no_reg_ranges[] = {
 202         regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
 203                          TPS65132_REG_CONTROL - 1),
 204 };
 205
 206 static const struct regmap_access_table tps65132_no_reg_table = {
 207         .no_ranges = tps65132_no_reg_ranges,
 208         .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
 209 };
 210
 211 static const struct regmap_config tps65132_regmap_config = {
 212         .reg_bits       = 8,
 213         .val_bits       = 8,
 214         .max_register   = TPS65132_REG_CONTROL,
 215         .cache_type     = REGCACHE_NONE,
 216         .rd_table       = &tps65132_no_reg_table,
 217         .wr_table       = &tps65132_no_reg_table,
 218 };
 219
 220 static int tps65132_probe(struct i2c_client *client,
 221                           const struct i2c_device_id *client_id)
 222 {
 223         struct device *dev = &client->dev;
 224         struct tps65132_regulator *tps;
 225         struct regulator_dev *rdev;
 226         struct regmap *rmap;
 227         struct regulator_config config = { };
 228         int id;
 229         int ret;
 230
 231         tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
 232         if (!tps)
 233                 return -ENOMEM;
 234
 235         rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
 236         if (IS_ERR(rmap)) {
 237                 ret = PTR_ERR(rmap);
 238                 dev_err(dev, "regmap init failed: %d\n", ret);
 239                 return ret;
 240         }
 241
 242         i2c_set_clientdata(client, tps);
 243         tps->dev = dev;
 244
 245         for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
 246                 config.regmap = rmap;
 247                 config.dev = dev;
 248                 config.driver_data = tps;
 249
 250                 rdev = devm_regulator_register(dev, &tps_regs_desc[id],
 251                                                &config);
 252                 if (IS_ERR(rdev)) {
 253                         ret = PTR_ERR(rdev);
 254                         dev_err(dev, "regulator %s register failed: %d\n",
 255                                 tps_regs_desc[id].name, ret);
 256                         return ret;
 257                 }
 258         }
 259         return 0;
 260 }
 261
 262 static const struct i2c_device_id tps65132_id[] = {
 263         {.name = "tps65132",},
 264         {},
 265 };
 266 MODULE_DEVICE_TABLE(i2c, tps65132_id);
 267
 268 static struct i2c_driver tps65132_i2c_driver = {
 269         .driver = {
 270                 .name = "tps65132",
 271         },
 272         .probe = tps65132_probe,
 273         .id_table = tps65132_id,
 274 };
 275
 276 module_i2c_driver(tps65132_i2c_driver);
 277
 278 MODULE_DESCRIPTION("tps65132 regulator driver");
 279 MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
 280 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 281 MODULE_LICENSE("GPL v2");