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linux/drivers/regulator/da9211-regulator.c
Steve Twiss 65378de335
regulator: da9211: Fix notifier mutex lock warning 
The mutex for the regulator_dev must be controlled by the caller of
the regulator_notifier_call_chain(), as described in the comment
for that function.

Failure to mutex lock and unlock surrounding the notifier call results
in a kernel WARN_ON_ONCE() which will dump a backtrace for the
regulator_notifier_call_chain() when that function call is first made.
The mutex can be controlled using the regulator_lock/unlock() API.

Fixes: 1028a37daa ("regulator: da9211: new regulator driver")
Suggested-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-03-13 15:11:25 +00:00

546 lines
14 KiB
C
Raw Blame History

/*
* da9211-regulator.c - Regulator device driver for DA9211/DA9212
* /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
* Copyright (C) 2015 Dialog Semiconductor Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*/
#include <linux/err.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/gpio/consumer.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/da9211.h>
#include "da9211-regulator.h"
/* DEVICE IDs */
#define DA9211_DEVICE_ID 0x22
#define DA9213_DEVICE_ID 0x23
#define DA9215_DEVICE_ID 0x24
#define DA9211_BUCK_MODE_SLEEP 1
#define DA9211_BUCK_MODE_SYNC 2
#define DA9211_BUCK_MODE_AUTO 3
/* DA9211 REGULATOR IDs */
#define DA9211_ID_BUCKA 0
#define DA9211_ID_BUCKB 1
struct da9211 {
struct device *dev;
struct regmap *regmap;
struct da9211_pdata *pdata;
struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
int num_regulator;
int chip_irq;
int chip_id;
};
static const struct regmap_range_cfg da9211_regmap_range[] = {
{
.selector_reg = DA9211_REG_PAGE_CON,
.selector_mask = DA9211_REG_PAGE_MASK,
.selector_shift = DA9211_REG_PAGE_SHIFT,
.window_start = 0,
.window_len = 256,
.range_min = 0,
.range_max = 5*128,
},
};
static const struct regmap_config da9211_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 5 * 128,
.ranges = da9211_regmap_range,
.num_ranges = ARRAY_SIZE(da9211_regmap_range),
};
/* Default limits measured in millivolts and milliamps */
#define DA9211_MIN_MV 300
#define DA9211_MAX_MV 1570
#define DA9211_STEP_MV 10
/* Current limits for DA9211 buck (uA) indices
* corresponds with register values
*/
static const int da9211_current_limits[] = {
2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
};
/* Current limits for DA9213 buck (uA) indices
* corresponds with register values
*/
static const int da9213_current_limits[] = {
3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
};
/* Current limits for DA9215 buck (uA) indices
* corresponds with register values
*/
static const int da9215_current_limits[] = {
4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
};
static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
{
int id = rdev_get_id(rdev);
struct da9211 *chip = rdev_get_drvdata(rdev);
unsigned int data;
int ret, mode = 0;
ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
if (ret < 0)
return ret;
switch (data & 0x03) {
case DA9211_BUCK_MODE_SYNC:
mode = REGULATOR_MODE_FAST;
break;
case DA9211_BUCK_MODE_AUTO:
mode = REGULATOR_MODE_NORMAL;
break;
case DA9211_BUCK_MODE_SLEEP:
mode = REGULATOR_MODE_STANDBY;
break;
}
return mode;
}
static int da9211_buck_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
int id = rdev_get_id(rdev);
struct da9211 *chip = rdev_get_drvdata(rdev);
int val = 0;
switch (mode) {
case REGULATOR_MODE_FAST:
val = DA9211_BUCK_MODE_SYNC;
break;
case REGULATOR_MODE_NORMAL:
val = DA9211_BUCK_MODE_AUTO;
break;
case REGULATOR_MODE_STANDBY:
val = DA9211_BUCK_MODE_SLEEP;
break;
}
return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
0x03, val);
}
static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
int max)
{
int id = rdev_get_id(rdev);
struct da9211 *chip = rdev_get_drvdata(rdev);
int i, max_size;
const int *current_limits;
switch (chip->chip_id) {
case DA9211:
current_limits = da9211_current_limits;
max_size = ARRAY_SIZE(da9211_current_limits)-1;
break;
case DA9213:
current_limits = da9213_current_limits;
max_size = ARRAY_SIZE(da9213_current_limits)-1;
break;
case DA9215:
current_limits = da9215_current_limits;
max_size = ARRAY_SIZE(da9215_current_limits)-1;
break;
default:
return -EINVAL;
}
/* search for closest to maximum */
for (i = max_size; i >= 0; i--) {
if (min <= current_limits[i] &&
max >= current_limits[i]) {
return regmap_update_bits(chip->regmap,
DA9211_REG_BUCK_ILIM,
(0x0F << id*4), (i << id*4));
}
}
return -EINVAL;
}
static int da9211_get_current_limit(struct regulator_dev *rdev)
{
int id = rdev_get_id(rdev);
struct da9211 *chip = rdev_get_drvdata(rdev);
unsigned int data;
int ret;
const int *current_limits;
switch (chip->chip_id) {
case DA9211:
current_limits = da9211_current_limits;
break;
case DA9213:
current_limits = da9213_current_limits;
break;
case DA9215:
current_limits = da9215_current_limits;
break;
default:
return -EINVAL;
}
ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
if (ret < 0)
return ret;
/* select one of 16 values: 0000 (2000mA or 3000mA)
* to 1111 (5000mA or 6000mA).
*/
data = (data >> id*4) & 0x0F;
return current_limits[data];
}
static const struct regulator_ops da9211_buck_ops = {
.get_mode = da9211_buck_get_mode,
.set_mode = da9211_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 = da9211_set_current_limit,
.get_current_limit = da9211_get_current_limit,
};
#define DA9211_BUCK(_id) \
{\
.name = #_id,\
.ops = &da9211_buck_ops,\
.type = REGULATOR_VOLTAGE,\
.id = DA9211_ID_##_id,\
.n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
.min_uV = (DA9211_MIN_MV * 1000),\
.uV_step = (DA9211_STEP_MV * 1000),\
.enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
.enable_mask = DA9211_BUCKA_EN,\
.vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
.vsel_mask = DA9211_VBUCK_MASK,\
.owner = THIS_MODULE,\
}
static struct regulator_desc da9211_regulators[] = {
DA9211_BUCK(BUCKA),
DA9211_BUCK(BUCKB),
};
#ifdef CONFIG_OF
static struct of_regulator_match da9211_matches[] = {
[DA9211_ID_BUCKA] = { .name = "BUCKA" },
[DA9211_ID_BUCKB] = { .name = "BUCKB" },
};
static struct da9211_pdata *da9211_parse_regulators_dt(
struct device *dev)
{
struct da9211_pdata *pdata;
struct device_node *node;
int i, num, n;
node = of_get_child_by_name(dev->of_node, "regulators");
if (!node) {
dev_err(dev, "regulators node not found\n");
return ERR_PTR(-ENODEV);
}
num = of_regulator_match(dev, node, da9211_matches,
ARRAY_SIZE(da9211_matches));
of_node_put(node);
if (num < 0) {
dev_err(dev, "Failed to match regulators\n");
return ERR_PTR(-EINVAL);
}
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
pdata->num_buck = num;
n = 0;
for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
if (!da9211_matches[i].init_data)
continue;
pdata->init_data[n] = da9211_matches[i].init_data;
pdata->reg_node[n] = da9211_matches[i].of_node;
pdata->gpiod_ren[n] = devm_gpiod_get_from_of_node(dev,
da9211_matches[i].of_node,
"enable",
0,
GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE,
"da9211-enable");
n++;
}
return pdata;
}
#else
static struct da9211_pdata *da9211_parse_regulators_dt(
struct device *dev)
{
return ERR_PTR(-ENODEV);
}
#endif
static irqreturn_t da9211_irq_handler(int irq, void *data)
{
struct da9211 *chip = data;
int reg_val, err, ret = IRQ_NONE;
err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
if (err < 0)
goto error_i2c;
if (reg_val & DA9211_E_OV_CURR_A) {
regulator_lock(chip->rdev[0]);
regulator_notifier_call_chain(chip->rdev[0],
REGULATOR_EVENT_OVER_CURRENT, NULL);
regulator_unlock(chip->rdev[0]);
err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
DA9211_E_OV_CURR_A);
if (err < 0)
goto error_i2c;
ret = IRQ_HANDLED;
}
if (reg_val & DA9211_E_OV_CURR_B) {
regulator_lock(chip->rdev[1]);
regulator_notifier_call_chain(chip->rdev[1],
REGULATOR_EVENT_OVER_CURRENT, NULL);
regulator_unlock(chip->rdev[1]);
err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
DA9211_E_OV_CURR_B);
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;
}
static int da9211_regulator_init(struct da9211 *chip)
{
struct regulator_config config = { };
int i, ret;
unsigned int data;
ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
if (ret < 0) {
dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
return ret;
}
data &= DA9211_SLAVE_SEL;
/* If configuration for 1/2 bucks is different between platform data
* and the register, driver should exit.
*/
if (chip->pdata->num_buck == 1 && data == 0x00)
chip->num_regulator = 1;
else if (chip->pdata->num_buck == 2 && data != 0x00)
chip->num_regulator = 2;
else {
dev_err(chip->dev, "Configuration is mismatched\n");
return -EINVAL;
}
for (i = 0; i < chip->num_regulator; i++) {
config.init_data = chip->pdata->init_data[i];
config.dev = chip->dev;
config.driver_data = chip;
config.regmap = chip->regmap;
config.of_node = chip->pdata->reg_node[i];
if (chip->pdata->gpiod_ren[i])
config.ena_gpiod = chip->pdata->gpiod_ren[i];
else
config.ena_gpiod = NULL;
/*
* Hand the GPIO descriptor management over to the regulator
* core, remove it from GPIO devres management.
*/
if (config.ena_gpiod)
devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
chip->rdev[i] = devm_regulator_register(chip->dev,
&da9211_regulators[i], &config);
if (IS_ERR(chip->rdev[i])) {
dev_err(chip->dev,
"Failed to register DA9211 regulator\n");
return PTR_ERR(chip->rdev[i]);
}
if (chip->chip_irq != 0) {
ret = regmap_update_bits(chip->regmap,
DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
if (ret < 0) {
dev_err(chip->dev,
"Failed to update mask reg: %d\n", ret);
return ret;
}
}
}
return 0;
}
/*
* I2C driver interface functions
*/
static int da9211_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct da9211 *chip;
int error, ret;
unsigned int data;
chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->dev = &i2c->dev;
chip->regmap = devm_regmap_init_i2c(i2c, &da9211_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);
chip->pdata = i2c->dev.platform_data;
ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
if (ret < 0) {
dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
return ret;
}
switch (data) {
case DA9211_DEVICE_ID:
chip->chip_id = DA9211;
break;
case DA9213_DEVICE_ID:
chip->chip_id = DA9213;
break;
case DA9215_DEVICE_ID:
chip->chip_id = DA9215;
break;
default:
dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
return -ENODEV;
}
if (!chip->pdata)
chip->pdata = da9211_parse_regulators_dt(chip->dev);
if (IS_ERR(chip->pdata)) {
dev_err(chip->dev, "No regulators defined for the platform\n");
return PTR_ERR(chip->pdata);
}
chip->chip_irq = i2c->irq;
if (chip->chip_irq != 0) {
ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
da9211_irq_handler,
IRQF_TRIGGER_LOW|IRQF_ONESHOT,
"da9211", chip);
if (ret != 0) {
dev_err(chip->dev, "Failed to request IRQ: %d\n",
chip->chip_irq);
return ret;
}
} else {
dev_warn(chip->dev, "No IRQ configured\n");
}
ret = da9211_regulator_init(chip);
if (ret < 0)
dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
return ret;
}
static const struct i2c_device_id da9211_i2c_id[] = {
{"da9211", DA9211},
{"da9212", DA9212},
{"da9213", DA9213},
{"da9223", DA9223},
{"da9214", DA9214},
{"da9224", DA9224},
{"da9215", DA9215},
{"da9225", DA9225},
{},
};
MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
#ifdef CONFIG_OF
static const struct of_device_id da9211_dt_ids[] = {
{ .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
{ .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
{ .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
{ .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
{ .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
{ .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
{ .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
{ .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
{},
};
MODULE_DEVICE_TABLE(of, da9211_dt_ids);
#endif
static struct i2c_driver da9211_regulator_driver = {
.driver = {
.name = "da9211",
.of_match_table = of_match_ptr(da9211_dt_ids),
},
.probe = da9211_i2c_probe,
.id_table = da9211_i2c_id,
};
module_i2c_driver(da9211_regulator_driver);
MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
MODULE_LICENSE("GPL");
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