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linux-sg2042/drivers/regulator/pv88080-regulator.c

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/*
* pv88080-regulator.c - Regulator device driver for PV88080
* Copyright (C) 2016 Powerventure Semiconductor Ltd.
*
* 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.
*/
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regmap.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/regulator/of_regulator.h>
#include <linux/proc_fs.h>
#include <linux/uaccess.h>
#include "pv88080-regulator.h"
#define PV88080_MAX_REGULATORS 3
/* PV88080 REGULATOR IDs */
enum {
/* BUCKs */
PV88080_ID_BUCK1,
PV88080_ID_BUCK2,
PV88080_ID_BUCK3,
};
struct pv88080_regulator {
struct regulator_desc desc;
/* Current limiting */
unsigned int n_current_limits;
const int *current_limits;
unsigned int limit_mask;
unsigned int conf;
unsigned int conf2;
unsigned int conf5;
};
struct pv88080 {
struct device *dev;
struct regmap *regmap;
struct regulator_dev *rdev[PV88080_MAX_REGULATORS];
};
struct pv88080_buck_voltage {
int min_uV;
int max_uV;
int uV_step;
};
static const struct regmap_config pv88080_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
/* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
* Entry indexes corresponds to register values.
*/
static const int pv88080_buck1_limits[] = {
3230000, 5130000, 6960000, 8790000
};
static const int pv88080_buck23_limits[] = {
1496000, 2393000, 3291000, 4189000
};
static const struct pv88080_buck_voltage pv88080_buck_vol[2] = {
{
.min_uV = 600000,
.max_uV = 1393750,
.uV_step = 6250,
},
{
.min_uV = 1400000,
.max_uV = 2193750,
.uV_step = 6250,
},
};
static unsigned int pv88080_buck_get_mode(struct regulator_dev *rdev)
{
struct pv88080_regulator *info = rdev_get_drvdata(rdev);
unsigned int data;
int ret, mode = 0;
ret = regmap_read(rdev->regmap, info->conf, &data);
if (ret < 0)
return ret;
switch (data & PV88080_BUCK1_MODE_MASK) {
case PV88080_BUCK_MODE_SYNC:
mode = REGULATOR_MODE_FAST;
break;
case PV88080_BUCK_MODE_AUTO:
mode = REGULATOR_MODE_NORMAL;
break;
case PV88080_BUCK_MODE_SLEEP:
mode = REGULATOR_MODE_STANDBY;
break;
default:
return -EINVAL;
}
return mode;
}
static int pv88080_buck_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
struct pv88080_regulator *info = rdev_get_drvdata(rdev);
int val = 0;
switch (mode) {
case REGULATOR_MODE_FAST:
val = PV88080_BUCK_MODE_SYNC;
break;
case REGULATOR_MODE_NORMAL:
val = PV88080_BUCK_MODE_AUTO;
break;
case REGULATOR_MODE_STANDBY:
val = PV88080_BUCK_MODE_SLEEP;
break;
default:
return -EINVAL;
}
return regmap_update_bits(rdev->regmap, info->conf,
PV88080_BUCK1_MODE_MASK, val);
}
static int pv88080_set_current_limit(struct regulator_dev *rdev, int min,
int max)
{
struct pv88080_regulator *info = rdev_get_drvdata(rdev);
int i;
/* search for closest to maximum */
for (i = info->n_current_limits; i >= 0; i--) {
if (min <= info->current_limits[i]
&& max >= info->current_limits[i]) {
return regmap_update_bits(rdev->regmap,
info->conf,
info->limit_mask,
i << PV88080_BUCK1_ILIM_SHIFT);
}
}
return -EINVAL;
}
static int pv88080_get_current_limit(struct regulator_dev *rdev)
{
struct pv88080_regulator *info = rdev_get_drvdata(rdev);
unsigned int data;
int ret;
ret = regmap_read(rdev->regmap, info->conf, &data);
if (ret < 0)
return ret;
data = (data & info->limit_mask) >> PV88080_BUCK1_ILIM_SHIFT;
return info->current_limits[data];
}
static struct regulator_ops pv88080_buck_ops = {
.get_mode = pv88080_buck_get_mode,
.set_mode = pv88080_buck_set_mode,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.set_current_limit = pv88080_set_current_limit,
.get_current_limit = pv88080_get_current_limit,
};
#define PV88080_BUCK(chip, regl_name, min, step, max, limits_array) \
{\
.desc = {\
.id = chip##_ID_##regl_name,\
.name = __stringify(chip##_##regl_name),\
.of_match = of_match_ptr(#regl_name),\
.regulators_node = of_match_ptr("regulators"),\
.type = REGULATOR_VOLTAGE,\
.owner = THIS_MODULE,\
.ops = &pv88080_buck_ops,\
.min_uV = min, \
.uV_step = step, \
.n_voltages = ((max) - (min))/(step) + 1, \
.enable_reg = PV88080_REG_##regl_name##_CONF0, \
.enable_mask = PV88080_##regl_name##_EN, \
.vsel_reg = PV88080_REG_##regl_name##_CONF0, \
.vsel_mask = PV88080_V##regl_name##_MASK, \
},\
.current_limits = limits_array, \
.n_current_limits = ARRAY_SIZE(limits_array), \
.limit_mask = PV88080_##regl_name##_ILIM_MASK, \
.conf = PV88080_REG_##regl_name##_CONF1, \
.conf2 = PV88080_REG_##regl_name##_CONF2, \
.conf5 = PV88080_REG_##regl_name##_CONF5, \
}
static struct pv88080_regulator pv88080_regulator_info[] = {
PV88080_BUCK(PV88080, BUCK1, 600000, 6250, 1393750,
pv88080_buck1_limits),
PV88080_BUCK(PV88080, BUCK2, 600000, 6250, 1393750,
pv88080_buck23_limits),
PV88080_BUCK(PV88080, BUCK3, 600000, 6250, 1393750,
pv88080_buck23_limits),
};
static irqreturn_t pv88080_irq_handler(int irq, void *data)
{
struct pv88080 *chip = data;
int i, reg_val, err, ret = IRQ_NONE;
err = regmap_read(chip->regmap, PV88080_REG_EVENT_A, &reg_val);
if (err < 0)
goto error_i2c;
if (reg_val & PV88080_E_VDD_FLT) {
for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
if (chip->rdev[i] != NULL) {
regulator_notifier_call_chain(chip->rdev[i],
REGULATOR_EVENT_UNDER_VOLTAGE,
NULL);
}
}
err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
PV88080_E_VDD_FLT);
if (err < 0)
goto error_i2c;
ret = IRQ_HANDLED;
}
if (reg_val & PV88080_E_OVER_TEMP) {
for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
if (chip->rdev[i] != NULL) {
regulator_notifier_call_chain(chip->rdev[i],
REGULATOR_EVENT_OVER_TEMP,
NULL);
}
}
err = regmap_write(chip->regmap, PV88080_REG_EVENT_A,
PV88080_E_OVER_TEMP);
if (err < 0)
goto error_i2c;
ret = IRQ_HANDLED;
}
return ret;
error_i2c:
dev_err(chip->dev, "I2C error : %d\n", err);
return IRQ_NONE;
}
/*
* I2C driver interface functions
*/
static int pv88080_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
struct pv88080 *chip;
struct regulator_config config = { };
int i, error, ret;
unsigned int conf2, conf5;
chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88080), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &i2c->dev;
chip->regmap = devm_regmap_init_i2c(i2c, &pv88080_regmap_config);
if (IS_ERR(chip->regmap)) {
error = PTR_ERR(chip->regmap);
dev_err(chip->dev, "Failed to allocate register map: %d\n",
error);
return error;
}
i2c_set_clientdata(i2c, chip);
if (i2c->irq != 0) {
ret = regmap_write(chip->regmap, PV88080_REG_MASK_A, 0xFF);
if (ret < 0) {
dev_err(chip->dev,
"Failed to mask A reg: %d\n", ret);
return ret;
}
ret = regmap_write(chip->regmap, PV88080_REG_MASK_B, 0xFF);
if (ret < 0) {
dev_err(chip->dev,
"Failed to mask B reg: %d\n", ret);
return ret;
}
ret = regmap_write(chip->regmap, PV88080_REG_MASK_C, 0xFF);
if (ret < 0) {
dev_err(chip->dev,
"Failed to mask C reg: %d\n", ret);
return ret;
}
ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
pv88080_irq_handler,
IRQF_TRIGGER_LOW|IRQF_ONESHOT,
"pv88080", chip);
if (ret != 0) {
dev_err(chip->dev, "Failed to request IRQ: %d\n",
i2c->irq);
return ret;
}
ret = regmap_update_bits(chip->regmap, PV88080_REG_MASK_A,
PV88080_M_VDD_FLT | PV88080_M_OVER_TEMP, 0);
if (ret < 0) {
dev_err(chip->dev,
"Failed to update mask reg: %d\n", ret);
return ret;
}
} else {
dev_warn(chip->dev, "No IRQ configured\n");
}
config.dev = chip->dev;
config.regmap = chip->regmap;
for (i = 0; i < PV88080_MAX_REGULATORS; i++) {
if (init_data)
config.init_data = &init_data[i];
ret = regmap_read(chip->regmap,
pv88080_regulator_info[i].conf2, &conf2);
if (ret < 0)
return ret;
conf2 = ((conf2 >> PV88080_BUCK_VDAC_RANGE_SHIFT) &
PV88080_BUCK_VDAC_RANGE_MASK);
ret = regmap_read(chip->regmap,
pv88080_regulator_info[i].conf5, &conf5);
if (ret < 0)
return ret;
conf5 = ((conf5 >> PV88080_BUCK_VRANGE_GAIN_SHIFT) &
PV88080_BUCK_VRANGE_GAIN_MASK);
pv88080_regulator_info[i].desc.min_uV =
pv88080_buck_vol[conf2].min_uV * (conf5+1);
pv88080_regulator_info[i].desc.uV_step =
pv88080_buck_vol[conf2].uV_step * (conf5+1);
pv88080_regulator_info[i].desc.n_voltages =
((pv88080_buck_vol[conf2].max_uV * (conf5+1))
- (pv88080_regulator_info[i].desc.min_uV))
/(pv88080_regulator_info[i].desc.uV_step) + 1;
config.driver_data = (void *)&pv88080_regulator_info[i];
chip->rdev[i] = devm_regulator_register(chip->dev,
&pv88080_regulator_info[i].desc, &config);
if (IS_ERR(chip->rdev[i])) {
dev_err(chip->dev,
"Failed to register PV88080 regulator\n");
return PTR_ERR(chip->rdev[i]);
}
}
return 0;
}
static const struct i2c_device_id pv88080_i2c_id[] = {
{"pv88080", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, pv88080_i2c_id);
#ifdef CONFIG_OF
static const struct of_device_id pv88080_dt_ids[] = {
{ .compatible = "pvs,pv88080", .data = &pv88080_i2c_id[0] },
{},
};
MODULE_DEVICE_TABLE(of, pv88080_dt_ids);
#endif
static struct i2c_driver pv88080_regulator_driver = {
.driver = {
.name = "pv88080",
.of_match_table = of_match_ptr(pv88080_dt_ids),
},
.probe = pv88080_i2c_probe,
.id_table = pv88080_i2c_id,
};
module_i2c_driver(pv88080_regulator_driver);
MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88080");
MODULE_LICENSE("GPL");
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