Quelle  wm8400-regulator.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0+
//
// Regulator support for WM8400
//
// Copyright 2008 Wolfson Microelectronics PLC.
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

#include <linux/bug.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/wm8400-private.h>

static const struct linear_range wm8400_ldo_ranges[] = {
 REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
 REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
};

static const struct regulator_ops wm8400_ldo_ops = {
 .is_enabled = regulator_is_enabled_regmap,
 .enable = regulator_enable_regmap,
 .disable = regulator_disable_regmap,
 .list_voltage = regulator_list_voltage_linear_range,
 .get_voltage_sel = regulator_get_voltage_sel_regmap,
 .set_voltage_sel = regulator_set_voltage_sel_regmap,
 .map_voltage = regulator_map_voltage_linear_range,
};

static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
{
 struct regmap *rmap = rdev_get_regmap(dev);
 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 u16 data[2];
 int ret;

 ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2);
 if (ret != 0)
  return 0;

 /* Datasheet: hibernate */
 if (data[0] & WM8400_DC1_SLEEP)
  return REGULATOR_MODE_STANDBY;

 /* Datasheet: standby */
 if (!(data[0] & WM8400_DC1_ACTIVE))
  return REGULATOR_MODE_IDLE;

 /* Datasheet: active with or without force PWM */
 if (data[1] & WM8400_DC1_FRC_PWM)
  return REGULATOR_MODE_FAST;
 else
  return REGULATOR_MODE_NORMAL;
}

static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
{
 struct regmap *rmap = rdev_get_regmap(dev);
 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 int ret;

 switch (mode) {
 case REGULATOR_MODE_FAST:
  /* Datasheet: active with force PWM */
  ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
          WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
  if (ret != 0)
   return ret;

  return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
           WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
           WM8400_DC1_ACTIVE);

 case REGULATOR_MODE_NORMAL:
  /* Datasheet: active */
  ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
          WM8400_DC1_FRC_PWM, 0);
  if (ret != 0)
   return ret;

  return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
           WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
           WM8400_DC1_ACTIVE);

 case REGULATOR_MODE_IDLE:
  /* Datasheet: standby */
  return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
           WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
 default:
  return -EINVAL;
 }
}

static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
       int input_uV, int output_uV,
       int load_uA)
{
 return REGULATOR_MODE_NORMAL;
}

static const struct regulator_ops wm8400_dcdc_ops = {
 .is_enabled = regulator_is_enabled_regmap,
 .enable = regulator_enable_regmap,
 .disable = regulator_disable_regmap,
 .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,
 .get_mode = wm8400_dcdc_get_mode,
 .set_mode = wm8400_dcdc_set_mode,
 .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
};

static const struct regulator_desc regulators[] = {
 {
  .name = "LDO1",
  .id = WM8400_LDO1,
  .ops = &wm8400_ldo_ops,
  .enable_reg = WM8400_LDO1_CONTROL,
  .enable_mask = WM8400_LDO1_ENA,
  .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
  .linear_ranges = wm8400_ldo_ranges,
  .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
  .vsel_reg = WM8400_LDO1_CONTROL,
  .vsel_mask = WM8400_LDO1_VSEL_MASK,
  .type = REGULATOR_VOLTAGE,
  .owner = THIS_MODULE,
 },
 {
  .name = "LDO2",
  .id = WM8400_LDO2,
  .ops = &wm8400_ldo_ops,
  .enable_reg = WM8400_LDO2_CONTROL,
  .enable_mask = WM8400_LDO2_ENA,
  .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
  .linear_ranges = wm8400_ldo_ranges,
  .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
  .type = REGULATOR_VOLTAGE,
  .vsel_reg = WM8400_LDO2_CONTROL,
  .vsel_mask = WM8400_LDO2_VSEL_MASK,
  .owner = THIS_MODULE,
 },
 {
  .name = "LDO3",
  .id = WM8400_LDO3,
  .ops = &wm8400_ldo_ops,
  .enable_reg = WM8400_LDO3_CONTROL,
  .enable_mask = WM8400_LDO3_ENA,
  .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
  .linear_ranges = wm8400_ldo_ranges,
  .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
  .vsel_reg = WM8400_LDO3_CONTROL,
  .vsel_mask = WM8400_LDO3_VSEL_MASK,
  .type = REGULATOR_VOLTAGE,
  .owner = THIS_MODULE,
 },
 {
  .name = "LDO4",
  .id = WM8400_LDO4,
  .ops = &wm8400_ldo_ops,
  .enable_reg = WM8400_LDO4_CONTROL,
  .enable_mask = WM8400_LDO4_ENA,
  .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
  .linear_ranges = wm8400_ldo_ranges,
  .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
  .vsel_reg = WM8400_LDO4_CONTROL,
  .vsel_mask = WM8400_LDO4_VSEL_MASK,
  .type = REGULATOR_VOLTAGE,
  .owner = THIS_MODULE,
 },
 {
  .name = "DCDC1",
  .id = WM8400_DCDC1,
  .ops = &wm8400_dcdc_ops,
  .enable_reg = WM8400_DCDC1_CONTROL_1,
  .enable_mask = WM8400_DC1_ENA_MASK,
  .n_voltages = WM8400_DC1_VSEL_MASK + 1,
  .vsel_reg = WM8400_DCDC1_CONTROL_1,
  .vsel_mask = WM8400_DC1_VSEL_MASK,
  .min_uV = 850000,
  .uV_step = 25000,
  .type = REGULATOR_VOLTAGE,
  .owner = THIS_MODULE,
 },
 {
  .name = "DCDC2",
  .id = WM8400_DCDC2,
  .ops = &wm8400_dcdc_ops,
  .enable_reg = WM8400_DCDC2_CONTROL_1,
  .enable_mask = WM8400_DC2_ENA_MASK,
  .n_voltages = WM8400_DC2_VSEL_MASK + 1,
  .vsel_reg = WM8400_DCDC2_CONTROL_1,
  .vsel_mask = WM8400_DC2_VSEL_MASK,
  .min_uV = 850000,
  .uV_step = 25000,
  .type = REGULATOR_VOLTAGE,
  .owner = THIS_MODULE,
 },
};

static int wm8400_regulator_probe(struct platform_device *pdev)
{
 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
 struct regulator_config config = { };
 struct regulator_dev *rdev;

 config.dev = &pdev->dev;
 config.init_data = dev_get_platdata(&pdev->dev);
 config.driver_data = wm8400;
 config.regmap = wm8400->regmap;

 rdev = devm_regulator_register(&pdev->dev, ®ulators[pdev->id],
           &config);
 if (IS_ERR(rdev))
  return PTR_ERR(rdev);

 platform_set_drvdata(pdev, rdev);

 return 0;
}

static struct platform_driver wm8400_regulator_driver = {
 .driver = {
  .name = "wm8400-regulator",
  .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 },
 .probe = wm8400_regulator_probe,
};

/**
 * wm8400_register_regulator - enable software control of a WM8400 regulator
 *
 * This function enables software control of a WM8400 regulator via
 * the regulator API.  It is intended to be called from the
 * platform_init() callback of the WM8400 MFD driver.
 *
 * @dev:      The WM8400 device to operate on.
 * @reg:      The regulator to control.
 * @initdata: Regulator initdata for the regulator.
 */
int wm8400_register_regulator(struct device *dev, int reg,
         struct regulator_init_data *initdata)
{
 struct wm8400 *wm8400 = dev_get_drvdata(dev);

 if (wm8400->regulators[reg].name)
  return -EBUSY;

 initdata->driver_data = wm8400;

 wm8400->regulators[reg].name = "wm8400-regulator";
 wm8400->regulators[reg].id = reg;
 wm8400->regulators[reg].dev.parent = dev;
 wm8400->regulators[reg].dev.platform_data = initdata;

 return platform_device_register(&wm8400->regulators[reg]);
}
EXPORT_SYMBOL_GPL(wm8400_register_regulator);

static int __init wm8400_regulator_init(void)
{
 return platform_driver_register(&wm8400_regulator_driver);
}
subsys_initcall(wm8400_regulator_init);

static void __exit wm8400_regulator_exit(void)
{
 platform_driver_unregister(&wm8400_regulator_driver);
}
module_exit(wm8400_regulator_exit);

MODULE_AUTHOR("Mark Brown ");
MODULE_DESCRIPTION("WM8400 regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8400-regulator");