// SPDX-License-Identifier: GPL-2.0-only
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
enum {
DSV_OUT_VLCM = 0,
DSV_OUT_VPOS,
DSV_OUT_VNEG,
DSV_OUT_MAX
};
#define RT4831_REG_DSVEN 0x09
#define RT4831_REG_VLCM 0x0c
#define RT4831_REG_VPOS 0x0d
#define RT4831_REG_VNEG 0x0e
#define RT4831_REG_FLAGS 0x0f
#define RT4831_VOLT_MASK GENMASK(5, 0)
#define RT4831_DSVMODE_SHIFT 5
#define RT4831_DSVMODE_MASK GENMASK(7, 5)
#define RT4831_POSADEN_MASK BIT(4)
#define RT4831_NEGADEN_MASK BIT(3)
#define RT4831_POSEN_MASK BIT(2)
#define RT4831_NEGEN_MASK BIT(1)
#define RT4831_OTP_MASK BIT(6)
#define RT4831_LCMOVP_MASK BIT(5)
#define RT4831_VPOSSCP_MASK BIT(3)
#define RT4831_VNEGSCP_MASK BIT(2)
#define DSV_MODE_NORMAL (0x4 << RT4831_DSVMODE_SHIFT)
#define DSV_MODE_BYPASS (0x6 << RT4831_DSVMODE_SHIFT)
#define STEP_UV 50000
#define VLCM_MIN_UV 4000000
#define VLCM_MAX_UV 7150000
#define VLCM_N_VOLTAGES ((VLCM_MAX_UV - VLCM_MIN_UV) / STEP_UV + 1)
#define VPN_MIN_UV 4000000
#define VPN_MAX_UV 6500000
#define VPN_N_VOLTAGES ((VPN_MAX_UV - VPN_MIN_UV) / STEP_UV + 1)
static int rt4831_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
{
struct regmap *regmap = rdev_get_regmap(rdev);
int rid = rdev_get_id(rdev);
unsigned int val, events = 0;
int ret;
ret = regmap_read(regmap, RT4831_REG_FLAGS, &val);
if (ret)
return ret;
if (val & RT4831_OTP_MASK)
events |= REGULATOR_ERROR_OVER_TEMP;
if (rid == DSV_OUT_VLCM && (val & RT4831_LCMOVP_MASK))
events |= REGULATOR_ERROR_OVER_CURRENT;
if (rid == DSV_OUT_VPOS && (val & RT4831_VPOSSCP_MASK))
events |= REGULATOR_ERROR_OVER_CURRENT;
if (rid == DSV_OUT_VNEG && (val & RT4831_VNEGSCP_MASK))
events |= REGULATOR_ERROR_OVER_CURRENT;
*flags = events;
return 0;
}
static const struct regulator_ops rt4831_dsvlcm_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_bypass = regulator_set_bypass_regmap,
.get_bypass = regulator_get_bypass_regmap,
.get_error_flags = rt4831_get_error_flags,
};
static const struct regulator_ops rt4831_dsvpn_ops = {
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_active_discharge = regulator_set_active_discharge_regmap,
.get_error_flags = rt4831_get_error_flags,
};
static const struct regulator_desc rt4831_regulator_descs[] = {
{
.name = "DSVLCM",
.ops = &rt4831_dsvlcm_ops,
.of_match = of_match_ptr("DSVLCM"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_VOLTAGE,
.id = DSV_OUT_VLCM,
.n_voltages = VLCM_N_VOLTAGES,
.min_uV = VLCM_MIN_UV,
.uV_step = STEP_UV,
.vsel_reg = RT4831_REG_VLCM,
.vsel_mask = RT4831_VOLT_MASK,
.bypass_reg = RT4831_REG_DSVEN,
.bypass_val_on = DSV_MODE_BYPASS,
.bypass_val_off = DSV_MODE_NORMAL,
},
{
.name = "DSVP",
.ops = &rt4831_dsvpn_ops,
.of_match = of_match_ptr("DSVP"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_VOLTAGE,
.id = DSV_OUT_VPOS,
.n_voltages = VPN_N_VOLTAGES,
.min_uV = VPN_MIN_UV,
.uV_step = STEP_UV,
.vsel_reg = RT4831_REG_VPOS,
.vsel_mask = RT4831_VOLT_MASK,
.enable_reg = RT4831_REG_DSVEN,
.enable_mask = RT4831_POSEN_MASK,
.active_discharge_reg = RT4831_REG_DSVEN,
.active_discharge_mask = RT4831_POSADEN_MASK,
},
{
.name = "DSVN",
.ops = &rt4831_dsvpn_ops,
.of_match = of_match_ptr("DSVN"),
.regulators_node = of_match_ptr("regulators"),
.type = REGULATOR_VOLTAGE,
.id = DSV_OUT_VNEG,
.n_voltages = VPN_N_VOLTAGES,
.min_uV = VPN_MIN_UV,
.uV_step = STEP_UV,
.vsel_reg = RT4831_REG_VNEG,
.vsel_mask = RT4831_VOLT_MASK,
.enable_reg = RT4831_REG_DSVEN,
.enable_mask = RT4831_NEGEN_MASK,
.active_discharge_reg = RT4831_REG_DSVEN,
.active_discharge_mask = RT4831_NEGADEN_MASK,
}
};
static int rt4831_regulator_probe(struct platform_device *pdev)
{
struct regmap *regmap;
struct regulator_dev *rdev;
struct regulator_config config = {};
int i, ret;
regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!regmap) {
dev_err(&pdev->dev, "Failed to init regmap\n");
return -ENODEV;
}
/* Configure DSV mode to normal by default */
ret = regmap_update_bits(regmap, RT4831_REG_DSVEN, RT4831_DSVMODE_MASK, DSV_MODE_NORMAL);
if (ret) {
dev_err(&pdev->dev, "Failed to configure dsv mode to normal\n");
return ret;
}
config.dev = pdev->dev.parent;
config.regmap = regmap;
for (i = 0; i < DSV_OUT_MAX; i++) {
rdev = devm_regulator_register(&pdev->dev, rt4831_regulator_descs + i, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev, "Failed to register %d regulator\n", i);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id rt4831_regulator_match[] = {
{ "rt4831-regulator", 0 },
{}
};
MODULE_DEVICE_TABLE(platform, rt4831_regulator_match);
static struct platform_driver rt4831_regulator_driver = {
.driver = {
.name = "rt4831-regulator",
},
.id_table = rt4831_regulator_match,
.probe = rt4831_regulator_probe,
};
module_platform_driver(rt4831_regulator_driver);
MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
MODULE_LICENSE("GPL v2");
