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linux-next/drivers/regulator/max77857-regulator.c
Krzysztof Kozlowski b29f42c662
regulator: max77857: Fix Wvoid-pointer-to-enum-cast warning 
'id' is an enum, thus cast of pointer on 64-bit compile test with W=1
causes:

  max77857-regulator.c:56:24: error: cast to smaller integer type 'enum max77857_id' from 'void *' [-Werror,-Wvoid-pointer-to-enum-cast]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230810111914.204847-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-08-10 15:44:45 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2023 Analog Devices, Inc.
* ADI Regulator driver for the MAX77857
* MAX77859 and MAX77831.
*/
#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/util_macros.h>
#define MAX77857_REG_INT_SRC 0x10
#define MAX77857_REG_INT_MASK 0x11
#define MAX77857_REG_CONT1 0x12
#define MAX77857_REG_CONT2 0x13
#define MAX77857_REG_CONT3 0x14
#define MAX77857_INT_SRC_OCP BIT(0)
#define MAX77857_INT_SRC_THS BIT(1)
#define MAX77857_INT_SRC_HARDSHORT BIT(2)
#define MAX77857_INT_SRC_OVP BIT(3)
#define MAX77857_INT_SRC_POK BIT(4)
#define MAX77857_ILIM_MASK GENMASK(2, 0)
#define MAX77857_CONT1_FREQ GENMASK(4, 3)
#define MAX77857_CONT3_FPWM BIT(5)
#define MAX77859_REG_INT_SRC 0x11
#define MAX77859_REG_CONT1 0x13
#define MAX77859_REG_CONT2 0x14
#define MAX77859_REG_CONT3 0x15
#define MAX77859_REG_CONT5 0x17
#define MAX77859_CONT2_FPWM BIT(2)
#define MAX77859_CONT2_INTB BIT(3)
#define MAX77859_CONT3_DVS_START BIT(2)
#define MAX77859_VOLTAGE_SEL_MASK GENMASK(9, 0)
#define MAX77859_CURRENT_MIN 1000000
#define MAX77859_CURRENT_MAX 5000000
#define MAX77859_CURRENT_STEP 50000
enum max77857_id {
ID_MAX77831 = 1,
ID_MAX77857,
ID_MAX77859,
ID_MAX77859A,
};
static bool max77857_volatile_reg(struct device *dev, unsigned int reg)
{
enum max77857_id id = (uintptr_t)dev_get_drvdata(dev);
switch (id) {
case ID_MAX77831:
case ID_MAX77857:
return reg == MAX77857_REG_INT_SRC;
case ID_MAX77859:
case ID_MAX77859A:
return reg == MAX77859_REG_INT_SRC;
default:
return true;
}
}
static struct regmap_config max77857_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.cache_type = REGCACHE_MAPLE,
.volatile_reg = max77857_volatile_reg,
};
static int max77857_get_status(struct regulator_dev *rdev)
{
unsigned int val;
int ret;
ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
if (ret)
return ret;
if (FIELD_GET(MAX77857_INT_SRC_POK, val))
return REGULATOR_STATUS_ON;
return REGULATOR_STATUS_ERROR;
}
static unsigned int max77857_get_mode(struct regulator_dev *rdev)
{
enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
unsigned int regval;
int ret;
switch (id) {
case ID_MAX77831:
case ID_MAX77857:
ret = regmap_read(rdev->regmap, MAX77857_REG_CONT3, &regval);
if (ret)
return ret;
if (FIELD_GET(MAX77857_CONT3_FPWM, regval))
return REGULATOR_MODE_FAST;
break;
case ID_MAX77859:
case ID_MAX77859A:
ret = regmap_read(rdev->regmap, MAX77859_REG_CONT2, &regval);
if (ret)
return ret;
if (FIELD_GET(MAX77859_CONT2_FPWM, regval))
return REGULATOR_MODE_FAST;
break;
default:
return -EINVAL;
}
return REGULATOR_MODE_NORMAL;
}
static int max77857_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
enum max77857_id id = (uintptr_t)rdev_get_drvdata(rdev);
unsigned int reg, val;
switch (id) {
case ID_MAX77831:
case ID_MAX77857:
reg = MAX77857_REG_CONT3;
val = MAX77857_CONT3_FPWM;
break;
case ID_MAX77859:
case ID_MAX77859A:
reg = MAX77859_REG_CONT2;
val = MAX77859_CONT2_FPWM;
break;
default:
return -EINVAL;
}
switch (mode) {
case REGULATOR_MODE_FAST:
return regmap_set_bits(rdev->regmap, reg, val);
case REGULATOR_MODE_NORMAL:
return regmap_clear_bits(rdev->regmap, reg, val);
default:
return -EINVAL;
}
}
static int max77857_get_error_flags(struct regulator_dev *rdev,
unsigned int *flags)
{
unsigned int val;
int ret;
ret = regmap_read(rdev->regmap, MAX77857_REG_INT_SRC, &val);
if (ret)
return ret;
*flags = 0;
if (FIELD_GET(MAX77857_INT_SRC_OVP, val))
*flags |= REGULATOR_ERROR_OVER_VOLTAGE_WARN;
if (FIELD_GET(MAX77857_INT_SRC_OCP, val) ||
FIELD_GET(MAX77857_INT_SRC_HARDSHORT, val))
*flags |= REGULATOR_ERROR_OVER_CURRENT;
if (FIELD_GET(MAX77857_INT_SRC_THS, val))
*flags |= REGULATOR_ERROR_OVER_TEMP;
if (!FIELD_GET(MAX77857_INT_SRC_POK, val))
*flags |= REGULATOR_ERROR_FAIL;
return 0;
}
static struct linear_range max77859_lin_ranges[] = {
REGULATOR_LINEAR_RANGE(3200000, 0x0A0, 0x320, 20000)
};
static const unsigned int max77859_ramp_table[4] = {
1000, 500, 250, 125
};
static int max77859_set_voltage_sel(struct regulator_dev *rdev,
unsigned int sel)
{
__be16 reg;
int ret;
reg = cpu_to_be16(sel);
ret = regmap_bulk_write(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
if (ret)
return ret;
/* actually apply new voltage */
return regmap_set_bits(rdev->regmap, MAX77859_REG_CONT3,
MAX77859_CONT3_DVS_START);
}
static int max77859_get_voltage_sel(struct regulator_dev *rdev)
{
__be16 reg;
int ret;
ret = regmap_bulk_read(rdev->regmap, MAX77859_REG_CONT3, &reg, 2);
if (ret)
return ret;
return FIELD_GET(MAX77859_VOLTAGE_SEL_MASK, __be16_to_cpu(reg));
}
static int max77859_set_current_limit(struct regulator_dev *rdev, int min_uA, int max_uA)
{
u32 selector;
if (max_uA < MAX77859_CURRENT_MIN)
return -EINVAL;
selector = 0x12 + (max_uA - MAX77859_CURRENT_MIN) / MAX77859_CURRENT_STEP;
selector = clamp_val(selector, 0x00, 0x7F);
return regmap_write(rdev->regmap, MAX77859_REG_CONT5, selector);
}
static int max77859_get_current_limit(struct regulator_dev *rdev)
{
u32 selector;
int ret;
ret = regmap_read(rdev->regmap, MAX77859_REG_CONT5, &selector);
if (ret)
return ret;
if (selector <= 0x12)
return MAX77859_CURRENT_MIN;
if (selector >= 0x64)
return MAX77859_CURRENT_MAX;
return MAX77859_CURRENT_MIN + (selector - 0x12) * MAX77859_CURRENT_STEP;
}
static const struct regulator_ops max77859_regulator_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.set_voltage_sel = max77859_set_voltage_sel,
.get_voltage_sel = max77859_get_voltage_sel,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.get_status = max77857_get_status,
.set_mode = max77857_set_mode,
.get_mode = max77857_get_mode,
.get_error_flags = max77857_get_error_flags,
};
static const struct regulator_ops max77859a_regulator_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.set_voltage_sel = max77859_set_voltage_sel,
.get_voltage_sel = max77859_get_voltage_sel,
.set_current_limit = max77859_set_current_limit,
.get_current_limit = max77859_get_current_limit,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.get_status = max77857_get_status,
.set_mode = max77857_set_mode,
.get_mode = max77857_get_mode,
.get_error_flags = max77857_get_error_flags,
};
static const struct regulator_ops max77857_regulator_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
.get_status = max77857_get_status,
.set_mode = max77857_set_mode,
.get_mode = max77857_get_mode,
.get_error_flags = max77857_get_error_flags,
};
static struct linear_range max77857_lin_ranges[] = {
REGULATOR_LINEAR_RANGE(4485000, 0x3D, 0xCC, 73500)
};
static const unsigned int max77857_switch_freq[] = {
1200000, 1500000, 1800000, 2100000
};
#define RAMAP_DELAY_INIT_VAL 1333
static const unsigned int max77857_ramp_table[2][4] = {
{ RAMAP_DELAY_INIT_VAL, 667, 333, 227 }, /* when switch freq is 1.8MHz or 2.1MHz */
{ 1166, 667, 333, 167 }, /* when switch freq is 1.2MHz or 1.5MHz */
};
static struct regulator_desc max77857_regulator_desc = {
.ops = &max77857_regulator_ops,
.name = "max77857",
.linear_ranges = max77857_lin_ranges,
.n_linear_ranges = ARRAY_SIZE(max77857_lin_ranges),
.vsel_mask = 0xFF,
.vsel_reg = MAX77857_REG_CONT2,
.ramp_delay_table = max77857_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(max77857_ramp_table[0]),
.ramp_reg = MAX77857_REG_CONT3,
.ramp_mask = GENMASK(1, 0),
.ramp_delay = RAMAP_DELAY_INIT_VAL,
.owner = THIS_MODULE,
};
static void max77857_calc_range(struct device *dev, enum max77857_id id)
{
struct linear_range *range;
unsigned long vref_step;
u32 rtop = 0;
u32 rbot = 0;
device_property_read_u32(dev, "adi,rtop-ohms", &rtop);
device_property_read_u32(dev, "adi,rbot-ohms", &rbot);
if (!rbot || !rtop)
return;
switch (id) {
case ID_MAX77831:
case ID_MAX77857:
range = max77857_lin_ranges;
vref_step = 4900UL;
break;
case ID_MAX77859:
case ID_MAX77859A:
range = max77859_lin_ranges;
vref_step = 1250UL;
break;
}
range->step = DIV_ROUND_CLOSEST(vref_step * (rbot + rtop), rbot);
range->min = range->step * range->min_sel;
}
static int max77857_probe(struct i2c_client *client)
{
const struct i2c_device_id *i2c_id;
struct device *dev = &client->dev;
struct regulator_config cfg = { };
struct regulator_dev *rdev;
struct regmap *regmap;
enum max77857_id id;
u32 switch_freq = 0;
int ret;
i2c_id = i2c_client_get_device_id(client);
if (!i2c_id)
return -EINVAL;
id = i2c_id->driver_data;
dev_set_drvdata(dev, (void *)id);
if (id == ID_MAX77859 || id == ID_MAX77859A) {
max77857_regulator_desc.ops = &max77859_regulator_ops;
max77857_regulator_desc.linear_ranges = max77859_lin_ranges;
max77857_regulator_desc.ramp_delay_table = max77859_ramp_table;
max77857_regulator_desc.ramp_delay = max77859_ramp_table[0];
}
if (id == ID_MAX77859A)
max77857_regulator_desc.ops = &max77859a_regulator_ops;
max77857_calc_range(dev, id);
regmap = devm_regmap_init_i2c(client, &max77857_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"cannot initialize regmap\n");
device_property_read_u32(dev, "adi,switch-frequency-hz", &switch_freq);
if (switch_freq) {
switch_freq = find_closest(switch_freq, max77857_switch_freq,
ARRAY_SIZE(max77857_switch_freq));
if (id == ID_MAX77831 && switch_freq == 3)
switch_freq = 2;
switch (id) {
case ID_MAX77831:
case ID_MAX77857:
ret = regmap_update_bits(regmap, MAX77857_REG_CONT1,
MAX77857_CONT1_FREQ, switch_freq);
if (switch_freq >= 2)
break;
max77857_regulator_desc.ramp_delay_table = max77857_ramp_table[1];
max77857_regulator_desc.ramp_delay = max77857_ramp_table[1][0];
break;
case ID_MAX77859:
case ID_MAX77859A:
ret = regmap_update_bits(regmap, MAX77859_REG_CONT1,
MAX77857_CONT1_FREQ, switch_freq);
break;
}
if (ret)
return ret;
}
cfg.dev = dev;
cfg.driver_data = (void *)id;
cfg.regmap = regmap;
cfg.init_data = of_get_regulator_init_data(dev, dev->of_node,
&max77857_regulator_desc);
if (!cfg.init_data)
return -ENOMEM;
rdev = devm_regulator_register(dev, &max77857_regulator_desc, &cfg);
if (IS_ERR(rdev))
return dev_err_probe(dev, PTR_ERR(rdev),
"cannot register regulator\n");
return 0;
}
const struct i2c_device_id max77857_id[] = {
{ "max77831", ID_MAX77831 },
{ "max77857", ID_MAX77857 },
{ "max77859", ID_MAX77859 },
{ "max77859a", ID_MAX77859A },
{ }
};
MODULE_DEVICE_TABLE(i2c, max77857_id);
static const struct of_device_id max77857_of_id[] = {
{ .compatible = "adi,max77831", .data = (void *)ID_MAX77831 },
{ .compatible = "adi,max77857", .data = (void *)ID_MAX77857 },
{ .compatible = "adi,max77859", .data = (void *)ID_MAX77859 },
{ .compatible = "adi,max77859a", .data = (void *)ID_MAX77859A },
{ }
};
MODULE_DEVICE_TABLE(of, max77857_of_id);
static struct i2c_driver max77857_driver = {
.driver = {
.name = "max77857",
.of_match_table = max77857_of_id,
},
.id_table = max77857_id,
.probe = max77857_probe,
};
module_i2c_driver(max77857_driver);
MODULE_DESCRIPTION("Analog Devices MAX77857 Buck-Boost Converter Driver");
MODULE_AUTHOR("Ibrahim Tilki <Ibrahim.Tilki@analog.com>");
MODULE_AUTHOR("Okan Sahin <Okan.Sahin@analog.com>");
MODULE_LICENSE("GPL");
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