Quelle  tps6286x-regulator.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
// Copyright Axis Communications AB

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>

#include <dt-bindings/regulator/ti,tps62864.h>

#define TPS6286X_VOUT1  0x01
#define TPS6286X_VOUT1_VO1_SET GENMASK(7, 0)

#define TPS6286X_CONTROL 0x03
#define TPS6286X_CONTROL_FPWM BIT(4)
#define TPS6286X_CONTROL_SWEN BIT(5)

#define TPS6286X_STATUS  0x05

#define TPS6286X_MIN_MV  400
#define TPS6286X_MAX_MV  1675
#define TPS6286X_STEP_MV 5

static bool tps6286x_volatile_reg(struct device *dev, unsigned int reg)
{
 return reg == TPS6286X_STATUS;
}

static const struct regmap_config tps6286x_regmap_config = {
 .reg_bits = 8,
 .val_bits = 8,
 .cache_type = REGCACHE_MAPLE,
 .volatile_reg = tps6286x_volatile_reg,
};

static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
 unsigned int val;

 switch (mode) {
 case REGULATOR_MODE_NORMAL:
  val = 0;
  break;
 case REGULATOR_MODE_FAST:
  val = TPS6286X_CONTROL_FPWM;
  break;
 default:
  return -EINVAL;
 }

 return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
      TPS6286X_CONTROL_FPWM, val);
}

static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
{
 unsigned int val;
 int ret;

 ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
 if (ret < 0)
  return 0;

 return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}

static const struct regulator_ops tps6286x_regulator_ops = {
 .enable = regulator_enable_regmap,
 .disable = regulator_disable_regmap,
 .set_mode = tps6286x_set_mode,
 .get_mode = tps6286x_get_mode,
 .is_enabled = regulator_is_enabled_regmap,
 .set_voltage_sel = regulator_set_voltage_sel_regmap,
 .get_voltage_sel = regulator_get_voltage_sel_regmap,
 .list_voltage = regulator_list_voltage_linear,
};

static unsigned int tps6286x_of_map_mode(unsigned int mode)
{
 switch (mode) {
 case TPS62864_MODE_NORMAL:
  return REGULATOR_MODE_NORMAL;
 case TPS62864_MODE_FPWM:
  return REGULATOR_MODE_FAST;
 default:
  return REGULATOR_MODE_INVALID;
 }
}

static const struct regulator_desc tps6286x_reg = {
 .name = "tps6286x",
 .of_match = "SW",
 .owner = THIS_MODULE,
 .ops = &tps6286x_regulator_ops,
 .of_map_mode = tps6286x_of_map_mode,
 .regulators_node = "regulators",
 .type = REGULATOR_VOLTAGE,
 .n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
 .min_uV = TPS6286X_MIN_MV * 1000,
 .uV_step = TPS6286X_STEP_MV * 1000,
 .vsel_reg = TPS6286X_VOUT1,
 .vsel_mask = TPS6286X_VOUT1_VO1_SET,
 .enable_reg = TPS6286X_CONTROL,
 .enable_mask = TPS6286X_CONTROL_SWEN,
 .ramp_delay = 1000,
 /* tDelay + tRamp, rounded up */
 .enable_time = 3000,
};

static const struct of_device_id tps6286x_dt_ids[] = {
 { .compatible = "ti,tps62864", },
 { .compatible = "ti,tps62866", },
 { .compatible = "ti,tps62868", },
 { .compatible = "ti,tps62869", },
 { }
};
MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);

static int tps6286x_i2c_probe(struct i2c_client *i2c)
{
 struct device *dev = &i2c->dev;
 struct regulator_config config = {};
 struct regulator_dev *rdev;
 struct regmap *regmap;

 regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
 if (IS_ERR(regmap))
  return PTR_ERR(regmap);

 config.dev = &i2c->dev;
 config.of_node = dev->of_node;
 config.regmap = regmap;

 rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
 if (IS_ERR(rdev)) {
  dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
  return PTR_ERR(rdev);
 }

 return 0;
}

static const struct i2c_device_id tps6286x_i2c_id[] = {
 { "tps62864" },
 { "tps62866" },
 { "tps62868" },
 { "tps62869" },
 {}
};
MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);

static struct i2c_driver tps6286x_regulator_driver = {
 .driver = {
  .name = "tps6286x",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
  .of_match_table = tps6286x_dt_ids,
 },
 .probe = tps6286x_i2c_probe,
 .id_table = tps6286x_i2c_id,
};

module_i2c_driver(tps6286x_regulator_driver);

MODULE_DESCRIPTION("TI TPS6286x Power Regulator driver");
MODULE_LICENSE("GPL v2");