linux-stable/drivers/regulator/da9210-regulator.c
Geert Uytterhoeven 4d9cbff5aa regulator: da9210: Mask all interrupt sources to deassert interrupt line
After boot-up, some events may be set, and cause the da9210 interrupt
line to be asserted. As the da9210 driver doesn't have interrupt support
yet, this causes havoc on systems where the interrupt line is shared
among multiple devices.

This is the case on e.g. r8a7791/koelsch, where the interrupt line is
shared with a da9063 regulator, and the following events are set:

    EVENT_A = 0x00000011 (GPI0 | GPI4)
    EVENT_B = 0x00000002 (NPWRGOOD)

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-02-17 23:04:15 +09:00

197 lines
5.5 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/init.h>
#include <linux/slab.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.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 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];
}
/*
* I2C driver interface functions
*/
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;
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;
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",
.owner = THIS_MODULE,
},
.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");