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linux/drivers/regulator/max8997-regulator.c
Linus Walleij 84618d5e31 regulator: max8997: Convert to GPIO descriptors 
This rewrites the max8997 regulator driver to fetch the dvs
regulators as descriptors. This will likely mostly come from
the device tree since there are no in-tree users of the platform
data, but supplying GPIO descriptor tables from board files is
also possible if needed.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://msgid.link/r/20240220-descriptors-regulators-v1-4-097f608694be@linaro.org
Acked-by: Lee Jones <lee@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
2024-02-26 13:46:36 +00:00

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// SPDX-License-Identifier: GPL-2.0+
//
// max8997.c - Regulator driver for the Maxim 8997/8966
//
// Copyright (C) 2011 Samsung Electronics
// MyungJoo Ham <myungjoo.ham@samsung.com>
//
// This driver is based on max8998.c
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
#include <linux/regulator/of_regulator.h>
struct max8997_data {
struct device *dev;
struct max8997_dev *iodev;
int num_regulators;
int ramp_delay; /* in mV/us */
bool buck1_gpiodvs;
bool buck2_gpiodvs;
bool buck5_gpiodvs;
u8 buck1_vol[8];
u8 buck2_vol[8];
u8 buck5_vol[8];
struct gpio_desc *buck125_gpiods[3];
int buck125_gpioindex;
bool ignore_gpiodvs_side_effect;
u8 saved_states[MAX8997_REG_MAX];
};
static const unsigned int safeoutvolt[] = {
4850000,
4900000,
4950000,
3300000,
};
static inline void max8997_set_gpio(struct max8997_data *max8997)
{
int set3 = (max8997->buck125_gpioindex) & 0x1;
int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
gpiod_set_value(max8997->buck125_gpiods[0], set1);
gpiod_set_value(max8997->buck125_gpiods[1], set2);
gpiod_set_value(max8997->buck125_gpiods[2], set3);
}
struct voltage_map_desc {
int min;
int max;
int step;
};
/* Voltage maps in uV */
static const struct voltage_map_desc ldo_voltage_map_desc = {
.min = 800000, .max = 3950000, .step = 50000,
}; /* LDO1 ~ 18, 21 all */
static const struct voltage_map_desc buck1245_voltage_map_desc = {
.min = 650000, .max = 2225000, .step = 25000,
}; /* Buck1, 2, 4, 5 */
static const struct voltage_map_desc buck37_voltage_map_desc = {
.min = 750000, .max = 3900000, .step = 50000,
}; /* Buck3, 7 */
/* current map in uA */
static const struct voltage_map_desc charger_current_map_desc = {
.min = 200000, .max = 950000, .step = 50000,
};
static const struct voltage_map_desc topoff_current_map_desc = {
.min = 50000, .max = 200000, .step = 10000,
};
static const struct voltage_map_desc *reg_voltage_map[] = {
[MAX8997_LDO1] = &ldo_voltage_map_desc,
[MAX8997_LDO2] = &ldo_voltage_map_desc,
[MAX8997_LDO3] = &ldo_voltage_map_desc,
[MAX8997_LDO4] = &ldo_voltage_map_desc,
[MAX8997_LDO5] = &ldo_voltage_map_desc,
[MAX8997_LDO6] = &ldo_voltage_map_desc,
[MAX8997_LDO7] = &ldo_voltage_map_desc,
[MAX8997_LDO8] = &ldo_voltage_map_desc,
[MAX8997_LDO9] = &ldo_voltage_map_desc,
[MAX8997_LDO10] = &ldo_voltage_map_desc,
[MAX8997_LDO11] = &ldo_voltage_map_desc,
[MAX8997_LDO12] = &ldo_voltage_map_desc,
[MAX8997_LDO13] = &ldo_voltage_map_desc,
[MAX8997_LDO14] = &ldo_voltage_map_desc,
[MAX8997_LDO15] = &ldo_voltage_map_desc,
[MAX8997_LDO16] = &ldo_voltage_map_desc,
[MAX8997_LDO17] = &ldo_voltage_map_desc,
[MAX8997_LDO18] = &ldo_voltage_map_desc,
[MAX8997_LDO21] = &ldo_voltage_map_desc,
[MAX8997_BUCK1] = &buck1245_voltage_map_desc,
[MAX8997_BUCK2] = &buck1245_voltage_map_desc,
[MAX8997_BUCK3] = &buck37_voltage_map_desc,
[MAX8997_BUCK4] = &buck1245_voltage_map_desc,
[MAX8997_BUCK5] = &buck1245_voltage_map_desc,
[MAX8997_BUCK6] = NULL,
[MAX8997_BUCK7] = &buck37_voltage_map_desc,
[MAX8997_EN32KHZ_AP] = NULL,
[MAX8997_EN32KHZ_CP] = NULL,
[MAX8997_ENVICHG] = NULL,
[MAX8997_ESAFEOUT1] = NULL,
[MAX8997_ESAFEOUT2] = NULL,
[MAX8997_CHARGER_CV] = NULL,
[MAX8997_CHARGER] = &charger_current_map_desc,
[MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
};
static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
unsigned int selector)
{
int rid = rdev_get_id(rdev);
if (rid != MAX8997_CHARGER_CV)
goto err;
switch (selector) {
case 0x00:
return 4200000;
case 0x01 ... 0x0E:
return 4000000 + 20000 * (selector - 0x01);
case 0x0F:
return 4350000;
default:
return -EINVAL;
}
err:
return -EINVAL;
}
static int max8997_list_voltage(struct regulator_dev *rdev,
unsigned int selector)
{
const struct voltage_map_desc *desc;
int rid = rdev_get_id(rdev);
int val;
if (rid < 0 || rid >= ARRAY_SIZE(reg_voltage_map))
return -EINVAL;
desc = reg_voltage_map[rid];
if (desc == NULL)
return -EINVAL;
val = desc->min + desc->step * selector;
if (val > desc->max)
return -EINVAL;
return val;
}
static int max8997_get_enable_register(struct regulator_dev *rdev,
int *reg, int *mask, int *pattern)
{
int rid = rdev_get_id(rdev);
switch (rid) {
case MAX8997_LDO1 ... MAX8997_LDO21:
*reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
*mask = 0xC0;
*pattern = 0xC0;
break;
case MAX8997_BUCK1:
*reg = MAX8997_REG_BUCK1CTRL;
*mask = 0x01;
*pattern = 0x01;
break;
case MAX8997_BUCK2:
*reg = MAX8997_REG_BUCK2CTRL;
*mask = 0x01;
*pattern = 0x01;
break;
case MAX8997_BUCK3:
*reg = MAX8997_REG_BUCK3CTRL;
*mask = 0x01;
*pattern = 0x01;
break;
case MAX8997_BUCK4:
*reg = MAX8997_REG_BUCK4CTRL;
*mask = 0x01;
*pattern = 0x01;
break;
case MAX8997_BUCK5:
*reg = MAX8997_REG_BUCK5CTRL;
*mask = 0x01;
*pattern = 0x01;
break;
case MAX8997_BUCK6:
*reg = MAX8997_REG_BUCK6CTRL;
*mask = 0x01;
*pattern = 0x01;
break;
case MAX8997_BUCK7:
*reg = MAX8997_REG_BUCK7CTRL;
*mask = 0x01;
*pattern = 0x01;
break;
case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
*reg = MAX8997_REG_MAINCON1;
*mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
*pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
break;
case MAX8997_ENVICHG:
*reg = MAX8997_REG_MBCCTRL1;
*mask = 0x80;
*pattern = 0x80;
break;
case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
*reg = MAX8997_REG_SAFEOUTCTRL;
*mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
*pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
break;
case MAX8997_CHARGER:
*reg = MAX8997_REG_MBCCTRL2;
*mask = 0x40;
*pattern = 0x40;
break;
default:
/* Not controllable or not exists */
return -EINVAL;
}
return 0;
}
static int max8997_reg_is_enabled(struct regulator_dev *rdev)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int ret, reg, mask, pattern;
u8 val;
ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
if (ret)
return ret;
ret = max8997_read_reg(i2c, reg, &val);
if (ret)
return ret;
return (val & mask) == pattern;
}
static int max8997_reg_enable(struct regulator_dev *rdev)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int ret, reg, mask, pattern;
ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
if (ret)
return ret;
return max8997_update_reg(i2c, reg, pattern, mask);
}
static int max8997_reg_disable(struct regulator_dev *rdev)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int ret, reg, mask, pattern;
ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
if (ret)
return ret;
return max8997_update_reg(i2c, reg, ~pattern, mask);
}
static int max8997_get_voltage_register(struct regulator_dev *rdev,
int *_reg, int *_shift, int *_mask)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
int rid = rdev_get_id(rdev);
int reg, shift = 0, mask = 0x3f;
switch (rid) {
case MAX8997_LDO1 ... MAX8997_LDO21:
reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
break;
case MAX8997_BUCK1:
reg = MAX8997_REG_BUCK1DVS1;
if (max8997->buck1_gpiodvs)
reg += max8997->buck125_gpioindex;
break;
case MAX8997_BUCK2:
reg = MAX8997_REG_BUCK2DVS1;
if (max8997->buck2_gpiodvs)
reg += max8997->buck125_gpioindex;
break;
case MAX8997_BUCK3:
reg = MAX8997_REG_BUCK3DVS;
break;
case MAX8997_BUCK4:
reg = MAX8997_REG_BUCK4DVS;
break;
case MAX8997_BUCK5:
reg = MAX8997_REG_BUCK5DVS1;
if (max8997->buck5_gpiodvs)
reg += max8997->buck125_gpioindex;
break;
case MAX8997_BUCK7:
reg = MAX8997_REG_BUCK7DVS;
break;
case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
reg = MAX8997_REG_SAFEOUTCTRL;
shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
mask = 0x3;
break;
case MAX8997_CHARGER_CV:
reg = MAX8997_REG_MBCCTRL3;
shift = 0;
mask = 0xf;
break;
case MAX8997_CHARGER:
reg = MAX8997_REG_MBCCTRL4;
shift = 0;
mask = 0xf;
break;
case MAX8997_CHARGER_TOPOFF:
reg = MAX8997_REG_MBCCTRL5;
shift = 0;
mask = 0xf;
break;
default:
return -EINVAL;
}
*_reg = reg;
*_shift = shift;
*_mask = mask;
return 0;
}
static int max8997_get_voltage_sel(struct regulator_dev *rdev)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int reg, shift, mask, ret;
u8 val;
ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
if (ret)
return ret;
ret = max8997_read_reg(i2c, reg, &val);
if (ret)
return ret;
val >>= shift;
val &= mask;
return val;
}
static inline int max8997_get_voltage_proper_val(
const struct voltage_map_desc *desc,
int min_vol, int max_vol)
{
int i;
if (desc == NULL)
return -EINVAL;
if (max_vol < desc->min || min_vol > desc->max)
return -EINVAL;
if (min_vol < desc->min)
min_vol = desc->min;
i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
if (desc->min + desc->step * i > max_vol)
return -EINVAL;
return i;
}
static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
int min_uV, int max_uV, unsigned *selector)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int rid = rdev_get_id(rdev);
int lb, ub;
int reg, shift = 0, mask, ret = 0;
u8 val = 0x0;
if (rid != MAX8997_CHARGER_CV)
return -EINVAL;
ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
if (ret)
return ret;
if (max_uV < 4000000 || min_uV > 4350000)
return -EINVAL;
if (min_uV <= 4000000)
val = 0x1;
else if (min_uV <= 4200000 && max_uV >= 4200000)
val = 0x0;
else {
lb = (min_uV - 4000001) / 20000 + 2;
ub = (max_uV - 4000000) / 20000 + 1;
if (lb > ub)
return -EINVAL;
if (lb < 0xf)
val = lb;
else {
if (ub >= 0xf)
val = 0xf;
else
return -EINVAL;
}
}
*selector = val;
ret = max8997_update_reg(i2c, reg, val << shift, mask);
return ret;
}
/*
* For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
* BUCK1, 2, and 5 are available if they are not controlled by gpio
*/
static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
int min_uV, int max_uV, unsigned *selector)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
const struct voltage_map_desc *desc;
int rid = rdev_get_id(rdev);
int i, reg, shift, mask, ret;
switch (rid) {
case MAX8997_LDO1 ... MAX8997_LDO21:
break;
case MAX8997_BUCK1 ... MAX8997_BUCK5:
break;
case MAX8997_BUCK6:
return -EINVAL;
case MAX8997_BUCK7:
break;
case MAX8997_CHARGER:
break;
case MAX8997_CHARGER_TOPOFF:
break;
default:
return -EINVAL;
}
desc = reg_voltage_map[rid];
i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
if (i < 0)
return i;
ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
if (ret)
return ret;
ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
*selector = i;
return ret;
}
static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
unsigned int old_selector,
unsigned int new_selector)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
int rid = rdev_get_id(rdev);
const struct voltage_map_desc *desc = reg_voltage_map[rid];
/* Delay is required only if the voltage is increasing */
if (old_selector >= new_selector)
return 0;
/* No need to delay if gpio_dvs_mode */
switch (rid) {
case MAX8997_BUCK1:
if (max8997->buck1_gpiodvs)
return 0;
break;
case MAX8997_BUCK2:
if (max8997->buck2_gpiodvs)
return 0;
break;
case MAX8997_BUCK5:
if (max8997->buck5_gpiodvs)
return 0;
break;
}
switch (rid) {
case MAX8997_BUCK1:
case MAX8997_BUCK2:
case MAX8997_BUCK4:
case MAX8997_BUCK5:
return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
max8997->ramp_delay * 1000);
}
return 0;
}
/*
* Assess the damage on the voltage setting of BUCK1,2,5 by the change.
*
* When GPIO-DVS mode is used for multiple bucks, changing the voltage value
* of one of the bucks may affect that of another buck, which is the side
* effect of the change (set_voltage). This function examines the GPIO-DVS
* configurations and checks whether such side-effect exists.
*/
static int max8997_assess_side_effect(struct regulator_dev *rdev,
u8 new_val, int *best)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
int rid = rdev_get_id(rdev);
u8 *buckx_val[3];
bool buckx_gpiodvs[3];
int side_effect[8];
int min_side_effect = INT_MAX;
int i;
*best = -1;
switch (rid) {
case MAX8997_BUCK1:
rid = 0;
break;
case MAX8997_BUCK2:
rid = 1;
break;
case MAX8997_BUCK5:
rid = 2;
break;
default:
return -EINVAL;
}
buckx_val[0] = max8997->buck1_vol;
buckx_val[1] = max8997->buck2_vol;
buckx_val[2] = max8997->buck5_vol;
buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
for (i = 0; i < 8; i++) {
int others;
if (new_val != (buckx_val[rid])[i]) {
side_effect[i] = -1;
continue;
}
side_effect[i] = 0;
for (others = 0; others < 3; others++) {
int diff;
if (others == rid)
continue;
if (buckx_gpiodvs[others] == false)
continue; /* Not affected */
diff = (buckx_val[others])[i] -
(buckx_val[others])[max8997->buck125_gpioindex];
if (diff > 0)
side_effect[i] += diff;
else if (diff < 0)
side_effect[i] -= diff;
}
if (side_effect[i] == 0) {
*best = i;
return 0; /* NO SIDE EFFECT! Use This! */
}
if (side_effect[i] < min_side_effect) {
min_side_effect = side_effect[i];
*best = i;
}
}
if (*best == -1)
return -EINVAL;
return side_effect[*best];
}
/*
* For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
* max8997_set_voltage_ldobuck to do the job.
*/
static int max8997_set_voltage_buck(struct regulator_dev *rdev,
int min_uV, int max_uV, unsigned *selector)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
int rid = rdev_get_id(rdev);
const struct voltage_map_desc *desc;
int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
bool gpio_dvs_mode = false;
if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
return -EINVAL;
switch (rid) {
case MAX8997_BUCK1:
if (max8997->buck1_gpiodvs)
gpio_dvs_mode = true;
break;
case MAX8997_BUCK2:
if (max8997->buck2_gpiodvs)
gpio_dvs_mode = true;
break;
case MAX8997_BUCK5:
if (max8997->buck5_gpiodvs)
gpio_dvs_mode = true;
break;
}
if (!gpio_dvs_mode)
return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
selector);
desc = reg_voltage_map[rid];
new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
if (new_val < 0)
return new_val;
tmp_dmg = INT_MAX;
tmp_idx = -1;
tmp_val = -1;
do {
damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
if (damage == 0)
goto out;
if (tmp_dmg > damage) {
tmp_idx = new_idx;
tmp_val = new_val;
tmp_dmg = damage;
}
new_val++;
} while (desc->min + desc->step * new_val <= desc->max);
new_idx = tmp_idx;
new_val = tmp_val;
if (max8997->ignore_gpiodvs_side_effect == false)
return -EINVAL;
dev_warn(&rdev->dev,
"MAX8997 GPIO-DVS Side Effect Warning: GPIO SET: %d -> %d\n",
max8997->buck125_gpioindex, tmp_idx);
out:
if (new_idx < 0 || new_val < 0)
return -EINVAL;
max8997->buck125_gpioindex = new_idx;
max8997_set_gpio(max8997);
*selector = new_val;
return 0;
}
/* For SAFEOUT1 and SAFEOUT2 */
static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
unsigned selector)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int rid = rdev_get_id(rdev);
int reg, shift = 0, mask, ret;
if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
return -EINVAL;
ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
if (ret)
return ret;
return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
}
static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int ret, reg, mask, pattern;
int rid = rdev_get_id(rdev);
ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
if (ret)
return ret;
max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
if (rid == MAX8997_LDO1 ||
rid == MAX8997_LDO10 ||
rid == MAX8997_LDO21) {
dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
rdev->desc->name);
return max8997_update_reg(i2c, reg, 0x40, mask);
}
dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
rdev->desc->name, max8997->saved_states[rid] & mask,
(~pattern) & mask);
return max8997_update_reg(i2c, reg, ~pattern, mask);
}
static const struct regulator_ops max8997_ldo_ops = {
.list_voltage = max8997_list_voltage,
.is_enabled = max8997_reg_is_enabled,
.enable = max8997_reg_enable,
.disable = max8997_reg_disable,
.get_voltage_sel = max8997_get_voltage_sel,
.set_voltage = max8997_set_voltage_ldobuck,
.set_suspend_disable = max8997_reg_disable_suspend,
};
static const struct regulator_ops max8997_buck_ops = {
.list_voltage = max8997_list_voltage,
.is_enabled = max8997_reg_is_enabled,
.enable = max8997_reg_enable,
.disable = max8997_reg_disable,
.get_voltage_sel = max8997_get_voltage_sel,
.set_voltage = max8997_set_voltage_buck,
.set_voltage_time_sel = max8997_set_voltage_buck_time_sel,
.set_suspend_disable = max8997_reg_disable_suspend,
};
static const struct regulator_ops max8997_fixedvolt_ops = {
.list_voltage = max8997_list_voltage,
.is_enabled = max8997_reg_is_enabled,
.enable = max8997_reg_enable,
.disable = max8997_reg_disable,
.set_suspend_disable = max8997_reg_disable_suspend,
};
static const struct regulator_ops max8997_safeout_ops = {
.list_voltage = regulator_list_voltage_table,
.is_enabled = max8997_reg_is_enabled,
.enable = max8997_reg_enable,
.disable = max8997_reg_disable,
.get_voltage_sel = max8997_get_voltage_sel,
.set_voltage_sel = max8997_set_voltage_safeout_sel,
.set_suspend_disable = max8997_reg_disable_suspend,
};
static const struct regulator_ops max8997_fixedstate_ops = {
.list_voltage = max8997_list_voltage_charger_cv,
.get_voltage_sel = max8997_get_voltage_sel,
.set_voltage = max8997_set_voltage_charger_cv,
};
static int max8997_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
unsigned dummy;
int rid = rdev_get_id(rdev);
if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
return -EINVAL;
/* Reuse max8997_set_voltage_ldobuck to set current_limit. */
return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
}
static int max8997_get_current_limit(struct regulator_dev *rdev)
{
int sel, rid = rdev_get_id(rdev);
if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
return -EINVAL;
sel = max8997_get_voltage_sel(rdev);
if (sel < 0)
return sel;
/* Reuse max8997_list_voltage to get current_limit. */
return max8997_list_voltage(rdev, sel);
}
static const struct regulator_ops max8997_charger_ops = {
.is_enabled = max8997_reg_is_enabled,
.enable = max8997_reg_enable,
.disable = max8997_reg_disable,
.get_current_limit = max8997_get_current_limit,
.set_current_limit = max8997_set_current_limit,
};
static const struct regulator_ops max8997_charger_fixedstate_ops = {
.get_current_limit = max8997_get_current_limit,
.set_current_limit = max8997_set_current_limit,
};
#define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
.name = #_name, \
.id = MAX8997_##_name, \
.ops = &_ops, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
}
#define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
.name = #_name, \
.id = MAX8997_##_name, \
.ops = &_ops, \
.type = REGULATOR_CURRENT, \
.owner = THIS_MODULE, \
}
static struct regulator_desc regulators[] = {
MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
max8997_charger_fixedstate_ops),
};
#ifdef CONFIG_OF
static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
struct max8997_platform_data *pdata)
{
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct device_node *pmic_np, *regulators_np, *reg_np;
struct max8997_regulator_data *rdata;
unsigned int i, dvs_voltage_nr = 1;
pmic_np = iodev->dev->of_node;
if (!pmic_np) {
dev_err(&pdev->dev, "could not find pmic sub-node\n");
return -ENODEV;
}
regulators_np = of_get_child_by_name(pmic_np, "regulators");
if (!regulators_np) {
dev_err(&pdev->dev, "could not find regulators sub-node\n");
return -EINVAL;
}
/* count the number of regulators to be supported in pmic */
pdata->num_regulators = of_get_child_count(regulators_np);
rdata = devm_kcalloc(&pdev->dev,
pdata->num_regulators, sizeof(*rdata),
GFP_KERNEL);
if (!rdata) {
of_node_put(regulators_np);
return -ENOMEM;
}
pdata->regulators = rdata;
for_each_child_of_node(regulators_np, reg_np) {
for (i = 0; i < ARRAY_SIZE(regulators); i++)
if (of_node_name_eq(reg_np, regulators[i].name))
break;
if (i == ARRAY_SIZE(regulators)) {
dev_warn(&pdev->dev, "don't know how to configure regulator %pOFn\n",
reg_np);
continue;
}
rdata->id = i;
rdata->initdata = of_get_regulator_init_data(&pdev->dev,
reg_np,
&regulators[i]);
rdata->reg_node = reg_np;
rdata++;
}
of_node_put(regulators_np);
pdata->buck1_gpiodvs = of_property_read_bool(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs");
pdata->buck2_gpiodvs = of_property_read_bool(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs");
pdata->buck5_gpiodvs = of_property_read_bool(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs");
if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
pdata->buck5_gpiodvs) {
if (of_property_read_u32(pmic_np,
"max8997,pmic-buck125-default-dvs-idx",
&pdata->buck125_default_idx)) {
pdata->buck125_default_idx = 0;
} else {
if (pdata->buck125_default_idx >= 8) {
pdata->buck125_default_idx = 0;
dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
}
}
if (of_get_property(pmic_np,
"max8997,pmic-ignore-gpiodvs-side-effect", NULL))
pdata->ignore_gpiodvs_side_effect = true;
dvs_voltage_nr = 8;
}
if (of_property_read_u32_array(pmic_np,
"max8997,pmic-buck1-dvs-voltage",
pdata->buck1_voltage, dvs_voltage_nr)) {
dev_err(&pdev->dev, "buck1 voltages not specified\n");
return -EINVAL;
}
if (of_property_read_u32_array(pmic_np,
"max8997,pmic-buck2-dvs-voltage",
pdata->buck2_voltage, dvs_voltage_nr)) {
dev_err(&pdev->dev, "buck2 voltages not specified\n");
return -EINVAL;
}
if (of_property_read_u32_array(pmic_np,
"max8997,pmic-buck5-dvs-voltage",
pdata->buck5_voltage, dvs_voltage_nr)) {
dev_err(&pdev->dev, "buck5 voltages not specified\n");
return -EINVAL;
}
return 0;
}
#else
static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
struct max8997_platform_data *pdata)
{
return 0;
}
#endif /* CONFIG_OF */
static int max8997_pmic_probe(struct platform_device *pdev)
{
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max8997_platform_data *pdata = iodev->pdata;
struct regulator_config config = { };
struct regulator_dev *rdev;
struct max8997_data *max8997;
struct i2c_client *i2c;
int i, ret, nr_dvs;
u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
if (!pdata) {
dev_err(&pdev->dev, "No platform init data supplied.\n");
return -ENODEV;
}
if (iodev->dev->of_node) {
ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
if (ret)
return ret;
}
max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
GFP_KERNEL);
if (!max8997)
return -ENOMEM;
max8997->dev = &pdev->dev;
max8997->iodev = iodev;
max8997->num_regulators = pdata->num_regulators;
platform_set_drvdata(pdev, max8997);
i2c = max8997->iodev->i2c;
max8997->buck125_gpioindex = pdata->buck125_default_idx;
max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
pdata->buck5_gpiodvs) ? 8 : 1;
for (i = 0; i < nr_dvs; i++) {
max8997->buck1_vol[i] = ret =
max8997_get_voltage_proper_val(
&buck1245_voltage_map_desc,
pdata->buck1_voltage[i],
pdata->buck1_voltage[i] +
buck1245_voltage_map_desc.step);
if (ret < 0)
return ret;
max8997->buck2_vol[i] = ret =
max8997_get_voltage_proper_val(
&buck1245_voltage_map_desc,
pdata->buck2_voltage[i],
pdata->buck2_voltage[i] +
buck1245_voltage_map_desc.step);
if (ret < 0)
return ret;
max8997->buck5_vol[i] = ret =
max8997_get_voltage_proper_val(
&buck1245_voltage_map_desc,
pdata->buck5_voltage[i],
pdata->buck5_voltage[i] +
buck1245_voltage_map_desc.step);
if (ret < 0)
return ret;
if (max_buck1 < max8997->buck1_vol[i])
max_buck1 = max8997->buck1_vol[i];
if (max_buck2 < max8997->buck2_vol[i])
max_buck2 = max8997->buck2_vol[i];
if (max_buck5 < max8997->buck5_vol[i])
max_buck5 = max8997->buck5_vol[i];
}
/* For the safety, set max voltage before setting up */
for (i = 0; i < 8; i++) {
max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
max_buck1, 0x3f);
max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
max_buck2, 0x3f);
max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
max_buck5, 0x3f);
}
/* Initialize all the DVS related BUCK registers */
for (i = 0; i < nr_dvs; i++) {
max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
max8997->buck1_vol[i],
0x3f);
max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
max8997->buck2_vol[i],
0x3f);
max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
max8997->buck5_vol[i],
0x3f);
}
/*
* If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
* If at least one of them cares, set gpios.
*/
if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
pdata->buck5_gpiodvs) {
const char *gpio_names[3] = {"MAX8997 SET1", "MAX8997 SET2", "MAX8997 SET3"};
for (i = 0; i < 3; i++) {
enum gpiod_flags flags;
if (max8997->buck125_gpioindex & BIT(2 - i))
flags = GPIOD_OUT_HIGH;
else
flags = GPIOD_OUT_LOW;
max8997->buck125_gpiods[i] = devm_gpiod_get_index(iodev->dev,
"max8997,pmic-buck125-dvs",
i,
flags);
if (IS_ERR(max8997->buck125_gpiods[i])) {
ret = PTR_ERR(max8997->buck125_gpiods[i]);
return dev_err_probe(iodev->dev, ret, "cant get GPIO %d (%d)\n",
i, ret);
}
gpiod_set_consumer_name(max8997->buck125_gpiods[i], gpio_names[i]);
}
}
/* DVS-GPIO disabled */
max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
(1 << 1) : (0 << 1), 1 << 1);
max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
(1 << 1) : (0 << 1), 1 << 1);
max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
(1 << 1) : (0 << 1), 1 << 1);
/* Misc Settings */
max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
for (i = 0; i < pdata->num_regulators; i++) {
const struct voltage_map_desc *desc;
int id = pdata->regulators[i].id;
desc = reg_voltage_map[id];
if (desc) {
regulators[id].n_voltages =
(desc->max - desc->min) / desc->step + 1;
} else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
regulators[id].volt_table = safeoutvolt;
regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
} else if (id == MAX8997_CHARGER_CV) {
regulators[id].n_voltages = 16;
}
config.dev = max8997->dev;
config.init_data = pdata->regulators[i].initdata;
config.driver_data = max8997;
config.of_node = pdata->regulators[i].reg_node;
rdev = devm_regulator_register(&pdev->dev, &regulators[id],
&config);
if (IS_ERR(rdev)) {
dev_err(max8997->dev, "regulator init failed for %d\n",
id);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id max8997_pmic_id[] = {
{ "max8997-pmic", 0},
{ },
};
MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
static struct platform_driver max8997_pmic_driver = {
.driver = {
.name = "max8997-pmic",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = max8997_pmic_probe,
.id_table = max8997_pmic_id,
};
static int __init max8997_pmic_init(void)
{
return platform_driver_register(&max8997_pmic_driver);
}
subsys_initcall(max8997_pmic_init);
static void __exit max8997_pmic_cleanup(void)
{
platform_driver_unregister(&max8997_pmic_driver);
}
module_exit(max8997_pmic_cleanup);
MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");
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