/*
* max8997.c - Regulator driver for the Maxim 8997/8966
*
* Copyright (C) 2011 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@smasung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This driver is based on max8998.c
*/
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/of_gpio.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;
struct regulator_dev **rdev;
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];
int buck125_gpios[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;
gpio_set_value(max8997->buck125_gpios[0], set1);
gpio_set_value(max8997->buck125_gpios[1], set2);
gpio_set_value(max8997->buck125_gpios[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 >= ARRAY_SIZE(reg_voltage_map) ||
rid < 0)
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, ®, &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, ®, &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, ®, &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, ®, &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, ®, &shift, &mask);
if (ret)
return ret;
if (max_uV < 4000000 || min_uV > 4350000)
return -EINVAL;
if (min_uV <= 4000000) {
if (max_uV >= 4000000)
return -EINVAL;
else
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, ®, &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, ®, &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, ®, &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 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 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 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 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 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 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 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_dvs_gpio(struct platform_device *pdev,
struct max8997_platform_data *pdata,
struct device_node *pmic_np)
{
int i, gpio;
for (i = 0; i < 3; i++) {
gpio = of_get_named_gpio(pmic_np,
"max8997,pmic-buck125-dvs-gpios", i);
if (!gpio_is_valid(gpio)) {
dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
return -EINVAL;
}
pdata->buck125_gpios[i] = gpio;
}
return 0;
}
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, ret;
pmic_np = of_node_get(iodev->dev->of_node);
if (!pmic_np) {
dev_err(&pdev->dev, "could not find pmic sub-node\n");
return -ENODEV;
}
regulators_np = of_find_node_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_kzalloc(&pdev->dev, sizeof(*rdata) *
pdata->num_regulators, GFP_KERNEL);
if (!rdata) {
of_node_put(regulators_np);
dev_err(&pdev->dev, "could not allocate memory for regulator data\n");
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_cmp(reg_np->name, regulators[i].name))
break;
if (i == ARRAY_SIZE(regulators)) {
dev_warn(&pdev->dev, "don't know how to configure regulator %s\n",
reg_np->name);
continue;
}
rdata->id = i;
rdata->initdata = of_get_regulator_init_data(&pdev->dev,
reg_np);
rdata->reg_node = reg_np;
rdata++;
}
of_node_put(regulators_np);
if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
pdata->buck1_gpiodvs = true;
if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
pdata->buck2_gpiodvs = true;
if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
pdata->buck5_gpiodvs = true;
if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
pdata->buck5_gpiodvs) {
ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
if (ret)
return -EINVAL;
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, size, 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;
size = sizeof(struct regulator_dev *) * pdata->num_regulators;
max8997->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
if (!max8997->rdev)
return -ENOMEM;
rdev = max8997->rdev;
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;
memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
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)
goto err_out;
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)
goto err_out;
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)
goto err_out;
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) {
if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
!gpio_is_valid(pdata->buck125_gpios[1]) ||
!gpio_is_valid(pdata->buck125_gpios[2])) {
dev_err(&pdev->dev, "GPIO NOT VALID\n");
ret = -EINVAL;
goto err_out;
}
ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
"MAX8997 SET1");
if (ret)
goto err_out;
ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
"MAX8997 SET2");
if (ret)
goto err_out;
ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
"MAX8997 SET3");
if (ret)
goto err_out;
gpio_direction_output(pdata->buck125_gpios[0],
(max8997->buck125_gpioindex >> 2)
& 0x1); /* SET1 */
gpio_direction_output(pdata->buck125_gpios[1],
(max8997->buck125_gpioindex >> 1)
& 0x1); /* SET2 */
gpio_direction_output(pdata->buck125_gpios[2],
(max8997->buck125_gpioindex >> 0)
& 0x1); /* SET3 */
}
/* 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[i] = regulator_register(®ulators[id], &config);
if (IS_ERR(rdev[i])) {
ret = PTR_ERR(rdev[i]);
dev_err(max8997->dev, "regulator init failed for %d\n",
id);
rdev[i] = NULL;
goto err;
}
}
return 0;
err:
while (--i >= 0)
regulator_unregister(rdev[i]);
err_out:
return ret;
}
static int max8997_pmic_remove(struct platform_device *pdev)
{
struct max8997_data *max8997 = platform_get_drvdata(pdev);
struct regulator_dev **rdev = max8997->rdev;
int i;
for (i = 0; i < max8997->num_regulators; i++)
regulator_unregister(rdev[i]);
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",
.owner = THIS_MODULE,
},
.probe = max8997_pmic_probe,
.remove = max8997_pmic_remove,
.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");