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- /*
- * TI TPS65132 Regulator driver
- *
- * Copyright (C) 2017 NVIDIA CORPORATION. All rights reserved.
- *
- * Author: Venkat Reddy Talla <vreddytalla@nvidia.com>
- * Laxman Dewangan <ldewangan@nvidia.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
- * whether express or implied; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- */
- #include <linux/delay.h>
- #include <linux/err.h>
- #include <linux/gpio/consumer.h>
- #include <linux/i2c.h>
- #include <linux/module.h>
- #include <linux/regmap.h>
- #include <linux/regulator/driver.h>
- #include <linux/regulator/machine.h>
- #define TPS65132_REG_VPOS 0x00
- #define TPS65132_REG_VNEG 0x01
- #define TPS65132_REG_APPS_DISP_DISN 0x03
- #define TPS65132_REG_CONTROL 0x0FF
- #define TPS65132_VOUT_MASK 0x1F
- #define TPS65132_VOUT_N_VOLTAGE 0x15
- #define TPS65132_VOUT_VMIN 4000000
- #define TPS65132_VOUT_VMAX 6000000
- #define TPS65132_VOUT_STEP 100000
- #define TPS65132_REG_APPS_DIS_VPOS BIT(0)
- #define TPS65132_REG_APPS_DIS_VNEG BIT(1)
- #define TPS65132_REGULATOR_ID_VPOS 0
- #define TPS65132_REGULATOR_ID_VNEG 1
- #define TPS65132_MAX_REGULATORS 2
- #define TPS65132_ACT_DIS_TIME_SLACK 1000
- struct tps65132_reg_pdata {
- struct gpio_desc *en_gpiod;
- struct gpio_desc *act_dis_gpiod;
- unsigned int act_dis_time_us;
- int ena_gpio_state;
- };
- struct tps65132_regulator {
- struct device *dev;
- struct tps65132_reg_pdata reg_pdata[TPS65132_MAX_REGULATORS];
- };
- static int tps65132_regulator_enable(struct regulator_dev *rdev)
- {
- struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
- int id = rdev_get_id(rdev);
- struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
- int ret;
- if (!IS_ERR(rpdata->en_gpiod)) {
- gpiod_set_value_cansleep(rpdata->en_gpiod, 1);
- rpdata->ena_gpio_state = 1;
- }
- /* Hardware automatically enable discharge bit in enable */
- if (rdev->constraints->active_discharge ==
- REGULATOR_ACTIVE_DISCHARGE_DISABLE) {
- ret = regulator_set_active_discharge_regmap(rdev, false);
- if (ret < 0) {
- dev_err(tps->dev, "Failed to disable active discharge: %d\n",
- ret);
- return ret;
- }
- }
- return 0;
- }
- static int tps65132_regulator_disable(struct regulator_dev *rdev)
- {
- struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
- int id = rdev_get_id(rdev);
- struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
- if (!IS_ERR(rpdata->en_gpiod)) {
- gpiod_set_value_cansleep(rpdata->en_gpiod, 0);
- rpdata->ena_gpio_state = 0;
- }
- if (!IS_ERR(rpdata->act_dis_gpiod)) {
- gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 1);
- usleep_range(rpdata->act_dis_time_us, rpdata->act_dis_time_us +
- TPS65132_ACT_DIS_TIME_SLACK);
- gpiod_set_value_cansleep(rpdata->act_dis_gpiod, 0);
- }
- return 0;
- }
- static int tps65132_regulator_is_enabled(struct regulator_dev *rdev)
- {
- struct tps65132_regulator *tps = rdev_get_drvdata(rdev);
- int id = rdev_get_id(rdev);
- struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[id];
- if (!IS_ERR(rpdata->en_gpiod))
- return rpdata->ena_gpio_state;
- return 1;
- }
- static const struct regulator_ops tps65132_regulator_ops = {
- .enable = tps65132_regulator_enable,
- .disable = tps65132_regulator_disable,
- .is_enabled = tps65132_regulator_is_enabled,
- .list_voltage = regulator_list_voltage_linear,
- .map_voltage = regulator_map_voltage_linear,
- .get_voltage_sel = regulator_get_voltage_sel_regmap,
- .set_voltage_sel = regulator_set_voltage_sel_regmap,
- .set_active_discharge = regulator_set_active_discharge_regmap,
- };
- static int tps65132_of_parse_cb(struct device_node *np,
- const struct regulator_desc *desc,
- struct regulator_config *config)
- {
- struct tps65132_regulator *tps = config->driver_data;
- struct tps65132_reg_pdata *rpdata = &tps->reg_pdata[desc->id];
- int ret;
- rpdata->en_gpiod = devm_fwnode_get_index_gpiod_from_child(tps->dev,
- "enable", 0, &np->fwnode, 0, "enable");
- if (IS_ERR_OR_NULL(rpdata->en_gpiod)) {
- ret = PTR_ERR(rpdata->en_gpiod);
- /* Ignore the error other than probe defer */
- if (ret == -EPROBE_DEFER)
- return ret;
- return 0;
- }
- rpdata->act_dis_gpiod = devm_fwnode_get_index_gpiod_from_child(
- tps->dev, "active-discharge", 0,
- &np->fwnode, 0, "active-discharge");
- if (IS_ERR_OR_NULL(rpdata->act_dis_gpiod)) {
- ret = PTR_ERR(rpdata->act_dis_gpiod);
- /* Ignore the error other than probe defer */
- if (ret == -EPROBE_DEFER)
- return ret;
- return 0;
- }
- ret = of_property_read_u32(np, "ti,active-discharge-time-us",
- &rpdata->act_dis_time_us);
- if (ret < 0) {
- dev_err(tps->dev, "Failed to read active discharge time:%d\n",
- ret);
- return ret;
- }
- return 0;
- }
- #define TPS65132_REGULATOR_DESC(_id, _name) \
- [TPS65132_REGULATOR_ID_##_id] = { \
- .name = "tps65132-"#_name, \
- .supply_name = "vin", \
- .id = TPS65132_REGULATOR_ID_##_id, \
- .of_match = of_match_ptr(#_name), \
- .of_parse_cb = tps65132_of_parse_cb, \
- .ops = &tps65132_regulator_ops, \
- .n_voltages = TPS65132_VOUT_N_VOLTAGE, \
- .min_uV = TPS65132_VOUT_VMIN, \
- .uV_step = TPS65132_VOUT_STEP, \
- .enable_time = 500, \
- .vsel_mask = TPS65132_VOUT_MASK, \
- .vsel_reg = TPS65132_REG_##_id, \
- .active_discharge_off = 0, \
- .active_discharge_on = TPS65132_REG_APPS_DIS_##_id, \
- .active_discharge_mask = TPS65132_REG_APPS_DIS_##_id, \
- .active_discharge_reg = TPS65132_REG_APPS_DISP_DISN, \
- .type = REGULATOR_VOLTAGE, \
- .owner = THIS_MODULE, \
- }
- static const struct regulator_desc tps_regs_desc[TPS65132_MAX_REGULATORS] = {
- TPS65132_REGULATOR_DESC(VPOS, outp),
- TPS65132_REGULATOR_DESC(VNEG, outn),
- };
- static const struct regmap_range tps65132_no_reg_ranges[] = {
- regmap_reg_range(TPS65132_REG_APPS_DISP_DISN + 1,
- TPS65132_REG_CONTROL - 1),
- };
- static const struct regmap_access_table tps65132_no_reg_table = {
- .no_ranges = tps65132_no_reg_ranges,
- .n_no_ranges = ARRAY_SIZE(tps65132_no_reg_ranges),
- };
- static const struct regmap_config tps65132_regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
- .max_register = TPS65132_REG_CONTROL,
- .cache_type = REGCACHE_NONE,
- .rd_table = &tps65132_no_reg_table,
- .wr_table = &tps65132_no_reg_table,
- };
- static int tps65132_probe(struct i2c_client *client,
- const struct i2c_device_id *client_id)
- {
- struct device *dev = &client->dev;
- struct tps65132_regulator *tps;
- struct regulator_dev *rdev;
- struct regmap *rmap;
- struct regulator_config config = { };
- int id;
- int ret;
- tps = devm_kzalloc(dev, sizeof(*tps), GFP_KERNEL);
- if (!tps)
- return -ENOMEM;
- rmap = devm_regmap_init_i2c(client, &tps65132_regmap_config);
- if (IS_ERR(rmap)) {
- ret = PTR_ERR(rmap);
- dev_err(dev, "regmap init failed: %d\n", ret);
- return ret;
- }
- i2c_set_clientdata(client, tps);
- tps->dev = dev;
- for (id = 0; id < TPS65132_MAX_REGULATORS; ++id) {
- config.regmap = rmap;
- config.dev = dev;
- config.driver_data = tps;
- rdev = devm_regulator_register(dev, &tps_regs_desc[id],
- &config);
- if (IS_ERR(rdev)) {
- ret = PTR_ERR(rdev);
- dev_err(dev, "regulator %s register failed: %d\n",
- tps_regs_desc[id].name, ret);
- return ret;
- }
- }
- return 0;
- }
- static const struct i2c_device_id tps65132_id[] = {
- {.name = "tps65132",},
- {},
- };
- MODULE_DEVICE_TABLE(i2c, tps65132_id);
- static struct i2c_driver tps65132_i2c_driver = {
- .driver = {
- .name = "tps65132",
- },
- .probe = tps65132_probe,
- .id_table = tps65132_id,
- };
- module_i2c_driver(tps65132_i2c_driver);
- MODULE_DESCRIPTION("tps65132 regulator driver");
- MODULE_AUTHOR("Venkat Reddy Talla <vreddytalla@nvidia.com>");
- MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
- MODULE_LICENSE("GPL v2");
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