| 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"); |