/*
* MFD core driver for Ricoh RN5T618 PMIC
*
* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
#include <linux/regmap.h>
static const struct mfd_cell rn5t618_cells[] = {
{ .name = "rn5t618-regulator" },
{ .name = "rn5t618-wdt" },
};
static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case RN5T618_WATCHDOGCNT:
case RN5T618_DCIRQ:
case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
case RN5T618_IR_GPR:
case RN5T618_IR_GPF:
case RN5T618_MON_IOIN:
case RN5T618_INTMON:
return true;
default:
return false;
}
}
static const struct regmap_config rn5t618_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_reg = rn5t618_volatile_reg,
.max_register = RN5T618_MAX_REG,
.cache_type = REGCACHE_RBTREE,
};
static struct rn5t618 *rn5t618_pm_power_off;
static void rn5t618_power_off(void)
{
/* disable automatic repower-on */
regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
RN5T618_REPCNT_REPWRON, 0);
/* start power-off sequence */
regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
}
static int rn5t618_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct rn5t618 *priv;
int ret;
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
i2c_set_clientdata(i2c, priv);
priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
return ret;
}
ret = mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
if (ret) {
dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
return ret;
}
if (!pm_power_off) {
rn5t618_pm_power_off = priv;
pm_power_off = rn5t618_power_off;
}
return 0;
}
static int rn5t618_i2c_remove(struct i2c_client *i2c)
{
struct rn5t618 *priv = i2c_get_clientdata(i2c);
if (priv == rn5t618_pm_power_off) {
rn5t618_pm_power_off = NULL;
pm_power_off = NULL;
}
mfd_remove_devices(&i2c->dev);
return 0;
}
static const struct of_device_id rn5t618_of_match[] = {
{ .compatible = "ricoh,rn5t618" },
{ }
};
MODULE_DEVICE_TABLE(of, rn5t618_of_match);
static const struct i2c_device_id rn5t618_i2c_id[] = {
{ }
};
MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
static struct i2c_driver rn5t618_i2c_driver = {
.driver = {
.name = "rn5t618",
.of_match_table = of_match_ptr(rn5t618_of_match),
},
.probe = rn5t618_i2c_probe,
.remove = rn5t618_i2c_remove,
.id_table = rn5t618_i2c_id,
};
module_i2c_driver(rn5t618_i2c_driver);
MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
MODULE_LICENSE("GPL v2");
