Quelle  aat2870-regulator.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/drivers/regulator/aat2870-regulator.c
 *
 * Copyright (c) 2011, NVIDIA Corporation.
 * Author: Jin Park <jinyoungp@nvidia.com>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/aat2870.h>

struct aat2870_regulator {
 struct aat2870_data *aat2870;
 struct regulator_desc desc;

 u8 enable_addr;
 u8 enable_shift;
 u8 enable_mask;

 u8 voltage_addr;
 u8 voltage_shift;
 u8 voltage_mask;
};

static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
           unsigned selector)
{
 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 struct aat2870_data *aat2870 = ri->aat2870;

 return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
          selector << ri->voltage_shift);
}

static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
{
 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 struct aat2870_data *aat2870 = ri->aat2870;
 u8 val;
 int ret;

 ret = aat2870->read(aat2870, ri->voltage_addr, &val);
 if (ret)
  return ret;

 return (val & ri->voltage_mask) >> ri->voltage_shift;
}

static int aat2870_ldo_enable(struct regulator_dev *rdev)
{
 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 struct aat2870_data *aat2870 = ri->aat2870;

 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
          ri->enable_mask);
}

static int aat2870_ldo_disable(struct regulator_dev *rdev)
{
 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 struct aat2870_data *aat2870 = ri->aat2870;

 return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
}

static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
{
 struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 struct aat2870_data *aat2870 = ri->aat2870;
 u8 val;
 int ret;

 ret = aat2870->read(aat2870, ri->enable_addr, &val);
 if (ret)
  return ret;

 return val & ri->enable_mask ? 1 : 0;
}

static const struct regulator_ops aat2870_ldo_ops = {
 .list_voltage = regulator_list_voltage_table,
 .map_voltage = regulator_map_voltage_ascend,
 .set_voltage_sel = aat2870_ldo_set_voltage_sel,
 .get_voltage_sel = aat2870_ldo_get_voltage_sel,
 .enable = aat2870_ldo_enable,
 .disable = aat2870_ldo_disable,
 .is_enabled = aat2870_ldo_is_enabled,
};

static const unsigned int aat2870_ldo_voltages[] = {
 1200000, 1300000, 1500000, 1600000,
 1800000, 2000000, 2200000, 2500000,
 2600000, 2700000, 2800000, 2900000,
 3000000, 3100000, 3200000, 3300000,
};

#define AAT2870_LDO(ids)    \
 {      \
  .desc = {    \
   .name = #ids,   \
   .id = AAT2870_ID_##ids,  \
   .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
   .volt_table = aat2870_ldo_voltages, \
   .ops = &aat2870_ldo_ops, \
   .type = REGULATOR_VOLTAGE, \
   .owner = THIS_MODULE,  \
  },     \
 }

static struct aat2870_regulator aat2870_regulators[] = {
 AAT2870_LDO(LDOA),
 AAT2870_LDO(LDOB),
 AAT2870_LDO(LDOC),
 AAT2870_LDO(LDOD),
};

static struct aat2870_regulator *aat2870_get_regulator(int id)
{
 struct aat2870_regulator *ri = NULL;
 int i;

 for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
  ri = &aat2870_regulators[i];
  if (ri->desc.id == id)
   break;
 }

 if (i == ARRAY_SIZE(aat2870_regulators))
  return NULL;

 ri->enable_addr = AAT2870_LDO_EN;
 ri->enable_shift = id - AAT2870_ID_LDOA;
 ri->enable_mask = 0x1 << ri->enable_shift;

 ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
      AAT2870_LDO_CD : AAT2870_LDO_AB;
 ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
 ri->voltage_mask = 0xF << ri->voltage_shift;

 return ri;
}

static int aat2870_regulator_probe(struct platform_device *pdev)
{
 struct aat2870_regulator *ri;
 struct regulator_config config = { };
 struct regulator_dev *rdev;

 ri = aat2870_get_regulator(pdev->id);
 if (!ri) {
  dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
  return -EINVAL;
 }
 ri->aat2870 = dev_get_drvdata(pdev->dev.parent);

 config.dev = &pdev->dev;
 config.driver_data = ri;
 config.init_data = dev_get_platdata(&pdev->dev);

 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 if (IS_ERR(rdev)) {
  dev_err(&pdev->dev, "Failed to register regulator %s\n",
   ri->desc.name);
  return PTR_ERR(rdev);
 }
 platform_set_drvdata(pdev, rdev);

 return 0;
}

static struct platform_driver aat2870_regulator_driver = {
 .driver = {
  .name = "aat2870-regulator",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 },
 .probe = aat2870_regulator_probe,
};

static int __init aat2870_regulator_init(void)
{
 return platform_driver_register(&aat2870_regulator_driver);
}
subsys_initcall(aat2870_regulator_init);

static void __exit aat2870_regulator_exit(void)
{
 platform_driver_unregister(&aat2870_regulator_driver);
}
module_exit(aat2870_regulator_exit);

MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin Park ");
MODULE_ALIAS("platform:aat2870-regulator");