linux-hardened/drivers/regulator/da9210-regulator.c
Steve Twiss 2d0cf04ce1 regulator: da9210: addition of device tree support
Addition of device tree support for DA9210.
Two files are modified, the driver source file and the binding document.

Updates for the regulator source file include an .of_match_table entry and
node match checking in the probe() function for a compatible da9210 string.

Minor binding documentation changes have been made to the title and the
example.

Tested-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-07-15 11:45:26 +01:00

293 lines
7.9 KiB
C

/*
* da9210-regulator.c - Regulator device driver for DA9210
* Copyright (C) 2013 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.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>
#include "da9210-regulator.h"
struct da9210 {
struct regulator_dev *rdev;
struct regmap *regmap;
};
static const struct regmap_config da9210_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
int max_uA);
static int da9210_get_current_limit(struct regulator_dev *rdev);
static const struct regulator_ops da9210_buck_ops = {
.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 = da9210_set_current_limit,
.get_current_limit = da9210_get_current_limit,
};
/* Default limits measured in millivolts and milliamps */
#define DA9210_MIN_MV 300
#define DA9210_MAX_MV 1570
#define DA9210_STEP_MV 10
/* Current limits for buck (uA) indices corresponds with register values */
static const int da9210_buck_limits[] = {
1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
};
static const struct regulator_desc da9210_reg = {
.name = "DA9210",
.id = 0,
.ops = &da9210_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
.min_uV = (DA9210_MIN_MV * 1000),
.uV_step = (DA9210_STEP_MV * 1000),
.vsel_reg = DA9210_REG_VBUCK_A,
.vsel_mask = DA9210_VBUCK_MASK,
.enable_reg = DA9210_REG_BUCK_CONT,
.enable_mask = DA9210_BUCK_EN,
.owner = THIS_MODULE,
};
static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA,
int max_uA)
{
struct da9210 *chip = rdev_get_drvdata(rdev);
unsigned int sel;
int i;
/* search for closest to maximum */
for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) {
if (min_uA <= da9210_buck_limits[i] &&
max_uA >= da9210_buck_limits[i]) {
sel = i;
sel = sel << DA9210_BUCK_ILIM_SHIFT;
return regmap_update_bits(chip->regmap,
DA9210_REG_BUCK_ILIM,
DA9210_BUCK_ILIM_MASK, sel);
}
}
return -EINVAL;
}
static int da9210_get_current_limit(struct regulator_dev *rdev)
{
struct da9210 *chip = rdev_get_drvdata(rdev);
unsigned int data;
unsigned int sel;
int ret;
ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data);
if (ret < 0)
return ret;
/* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */
sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT;
return da9210_buck_limits[sel];
}
static irqreturn_t da9210_irq_handler(int irq, void *data)
{
struct da9210 *chip = data;
unsigned int val, handled = 0;
int error, ret = IRQ_NONE;
error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
if (error < 0)
goto error_i2c;
mutex_lock(&chip->rdev->mutex);
if (val & DA9210_E_OVCURR) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_OVER_CURRENT,
NULL);
handled |= DA9210_E_OVCURR;
}
if (val & DA9210_E_NPWRGOOD) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_UNDER_VOLTAGE,
NULL);
handled |= DA9210_E_NPWRGOOD;
}
if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_OVER_TEMP, NULL);
handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
}
if (val & DA9210_E_VMAX) {
regulator_notifier_call_chain(chip->rdev,
REGULATOR_EVENT_REGULATION_OUT,
NULL);
handled |= DA9210_E_VMAX;
}
mutex_unlock(&chip->rdev->mutex);
if (handled) {
/* Clear handled events */
error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
if (error < 0)
goto error_i2c;
ret = IRQ_HANDLED;
}
return ret;
error_i2c:
dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
return ret;
}
/*
* I2C driver interface functions
*/
static const struct of_device_id da9210_dt_ids[] = {
{ .compatible = "dlg,da9210", },
{ }
};
MODULE_DEVICE_TABLE(of, da9210_dt_ids);
static int da9210_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct da9210 *chip;
struct device *dev = &i2c->dev;
struct da9210_pdata *pdata = dev_get_platdata(dev);
struct regulator_dev *rdev = NULL;
struct regulator_config config = { };
int error;
const struct of_device_id *match;
if (i2c->dev.of_node && !pdata) {
match = of_match_device(of_match_ptr(da9210_dt_ids),
&i2c->dev);
if (!match) {
dev_err(&i2c->dev, "Error: No device match found\n");
return -ENODEV;
}
}
chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
if (IS_ERR(chip->regmap)) {
error = PTR_ERR(chip->regmap);
dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
error);
return error;
}
config.dev = &i2c->dev;
config.init_data = pdata ? &pdata->da9210_constraints :
of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
config.driver_data = chip;
config.regmap = chip->regmap;
config.of_node = dev->of_node;
/* Mask all interrupt sources to deassert interrupt line */
error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
if (!error)
error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
if (error) {
dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
return error;
}
rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
if (IS_ERR(rdev)) {
dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
return PTR_ERR(rdev);
}
chip->rdev = rdev;
if (i2c->irq) {
error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
da9210_irq_handler,
IRQF_TRIGGER_LOW |
IRQF_ONESHOT | IRQF_SHARED,
"da9210", chip);
if (error) {
dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
i2c->irq, error);
return error;
}
error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
DA9210_M_TEMP_WARN |
DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
if (error < 0) {
dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
error);
return error;
}
} else {
dev_warn(&i2c->dev, "No IRQ configured\n");
}
i2c_set_clientdata(i2c, chip);
return 0;
}
static const struct i2c_device_id da9210_i2c_id[] = {
{"da9210", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
static struct i2c_driver da9210_regulator_driver = {
.driver = {
.name = "da9210",
.of_match_table = of_match_ptr(da9210_dt_ids),
},
.probe = da9210_i2c_probe,
.id_table = da9210_i2c_id,
};
module_i2c_driver(da9210_regulator_driver);
MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
MODULE_LICENSE("GPL v2");