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linux-sg2042/drivers/regulator/tps65132-regulator.c

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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(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(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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