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// SPDX-License-Identifier: GPL-2.0
//
// MP8867/MP8869 regulator driver
//
// Copyright (C) 2020 Synaptics Incorporated
//
// Author: Jisheng Zhang <jszhang@kernel.org>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#define MP886X_VSEL 0x00
#define MP886X_V_BOOT (1 << 7)
#define MP886X_SYSCNTLREG1 0x01
#define MP886X_MODE (1 << 0)
#define MP886X_SLEW_SHIFT 3
#define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT)
#define MP886X_GO (1 << 6)
#define MP886X_EN (1 << 7)
struct mp886x_cfg_info {
const struct regulator_ops *rops;
const int slew_rates[8];
};
struct mp886x_device_info {
struct device *dev;
struct regulator_desc desc;
struct regulator_init_data *regulator;
struct gpio_desc *en_gpio;
const struct mp886x_cfg_info *ci;
u32 r[2];
unsigned int sel;
};
static int mp886x_set_ramp(struct regulator_dev *rdev, int ramp)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
const struct mp886x_cfg_info *ci = di->ci;
int reg = -1, i;
for (i = 0; i < ARRAY_SIZE(ci->slew_rates); i++) {
if (ramp <= ci->slew_rates[i])
reg = i;
else
break;
}
if (reg < 0) {
dev_err(di->dev, "unsupported ramp value %d\n", ramp);
return -EINVAL;
}
return regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_SLEW_MASK, reg << MP886X_SLEW_SHIFT);
}
static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
switch (mode) {
case REGULATOR_MODE_FAST:
regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_MODE, MP886X_MODE);
break;
case REGULATOR_MODE_NORMAL:
regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_MODE, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
{
u32 val;
int ret;
ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
if (ret < 0)
return ret;
if (val & MP886X_MODE)
return REGULATOR_MODE_FAST;
else
return REGULATOR_MODE_NORMAL;
}
static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
int ret;
ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_GO, MP886X_GO);
if (ret < 0)
return ret;
sel <<= ffs(rdev->desc->vsel_mask) - 1;
return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
}
static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
{
u32 tmp = uv * r1 / r2;
return uv + tmp;
}
static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
int ret, uv;
unsigned int val;
bool fbloop;
ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
if (ret)
return ret;
fbloop = val & MP886X_V_BOOT;
if (fbloop) {
uv = rdev->desc->min_uV;
uv = mp8869_scale(uv, di->r[0], di->r[1]);
return regulator_map_voltage_linear(rdev, uv, uv);
}
val &= rdev->desc->vsel_mask;
val >>= ffs(rdev->desc->vsel_mask) - 1;
return val;
}
static const struct regulator_ops mp8869_regulator_ops = {
.set_voltage_sel = mp8869_set_voltage_sel,
.get_voltage_sel = mp8869_get_voltage_sel,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mp886x_set_mode,
.get_mode = mp886x_get_mode,
.set_ramp_delay = mp886x_set_ramp,
};
static const struct mp886x_cfg_info mp8869_ci = {
.rops = &mp8869_regulator_ops,
.slew_rates = {
40000,
30000,
20000,
10000,
5000,
2500,
1250,
625,
},
};
static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
int ret, delta;
ret = mp8869_set_voltage_sel(rdev, sel);
if (ret < 0)
return ret;
delta = di->sel - sel;
if (abs(delta) <= 5)
ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
MP886X_GO, 0);
di->sel = sel;
return ret;
}
static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
{
struct mp886x_device_info *di = rdev_get_drvdata(rdev);
int ret, uv;
unsigned int val;
bool fbloop;
ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
if (ret)
return ret;
fbloop = val & MP886X_V_BOOT;
val &= rdev->desc->vsel_mask;
val >>= ffs(rdev->desc->vsel_mask) - 1;
if (fbloop) {
uv = regulator_list_voltage_linear(rdev, val);
uv = mp8869_scale(uv, di->r[0], di->r[1]);
return regulator_map_voltage_linear(rdev, uv, uv);
}
return val;
}
static const struct regulator_ops mp8867_regulator_ops = {
.set_voltage_sel = mp8867_set_voltage_sel,
.get_voltage_sel = mp8867_get_voltage_sel,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.map_voltage = regulator_map_voltage_linear,
.list_voltage = regulator_list_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_mode = mp886x_set_mode,
.get_mode = mp886x_get_mode,
.set_ramp_delay = mp886x_set_ramp,
};
static const struct mp886x_cfg_info mp8867_ci = {
.rops = &mp8867_regulator_ops,
.slew_rates = {
64000,
32000,
16000,
8000,
4000,
2000,
1000,
500,
},
};
static int mp886x_regulator_register(struct mp886x_device_info *di,
struct regulator_config *config)
{
struct regulator_desc *rdesc = &di->desc;
struct regulator_dev *rdev;
rdesc->name = "mp886x-reg";
rdesc->supply_name = "vin";
rdesc->ops = di->ci->rops;
rdesc->type = REGULATOR_VOLTAGE;
rdesc->n_voltages = 128;
rdesc->enable_reg = MP886X_SYSCNTLREG1;
rdesc->enable_mask = MP886X_EN;
rdesc->min_uV = 600000;
rdesc->uV_step = 10000;
rdesc->vsel_reg = MP886X_VSEL;
rdesc->vsel_mask = 0x3f;
rdesc->owner = THIS_MODULE;
rdev = devm_regulator_register(di->dev, &di->desc, config);
if (IS_ERR(rdev))
return PTR_ERR(rdev);
di->sel = rdesc->ops->get_voltage_sel(rdev);
return 0;
}
static const struct <
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