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/*
* MFD core driver for Ricoh RN5T618 PMIC
*
* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
* Copyright (C) 2016 Toradex AG
*
* 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/delay.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/mfd/rn5t618.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/reboot.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 struct notifier_block rn5t618_restart_handler;
static void rn5t618_trigger_poweroff_sequence(bool repower)
{
/* disable automatic repower-on */
regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
RN5T618_REPCNT_REPWRON,
repower ? 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 void rn5t618_power_off(void)
{
rn5t618_trigger_poweroff_sequence(false);
}
static int rn5t618_restart(struct notifier_block *this,
unsigned long mode, void *cmd)
{
rn5t618_trigger_poweroff_sequence(true);
/*
* Re-power factor detection on PMIC side is not instant. 1ms
* proved to be enough time until reset takes effect.
*/
mdelay(1);
return NOTIFY_DONE;
}
static const struct of_device_id rn5t618_of_match[] = {
{ .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 },
{ .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 },
{ .compatible = "ricoh,rc5t619", .data = (void *)RC5T619 },
{ }
};
MODULE_DEVICE_TABLE(of, rn5t618_of_match);
static int rn5t618_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
const struct of_device_id *of_id;
struct rn5t618 *priv;
int ret;
of_id = of_match_device(rn5t618_of_match, &i2c->dev);
if (!of_id) {
dev_err(&i2c->dev, "Failed to find matching DT ID\n");
return -EINVAL;
}
priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
i2c_set_clientdata(i2c, priv);
priv->variant = (long)of_id->data;
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 = devm_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;
}
rn5t618_pm_power_off = priv;
if (of_device_is_system_power_controller(i2c->dev.of_node)) {
if (!pm_power_off)
pm_power_off = rn5t618_power_off;
else
dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
}
rn5t618_restart_handler.notifier_call = rn5t618_restart;
rn5t618_restart_handler.priority = 192;
ret = register_restart_handler(&rn5t618_restart_handler);
if (ret) {
dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret);
return ret;
}
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;
}
unregister_restart_handler(&rn5t618_restart_handler);
return 0;
}
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 RN5T567/618 MFD driver");
MODULE_LICENSE("GPL v2");
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