mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Beniamino Galvani](/assets/img/avatar_default.png)
Ricoh RN5T618 is a power management IC which integrates 3 step-down DCDC converters, 7 low-dropout regulators, a Li-ion battery charger, fuel gauge, ADC, GPIOs and a watchdog timer. This commit adds a MFD core driver to support the I2C communication with the device. Signed-off-by: Beniamino Galvani <b.galvani@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
/*
|
|
* 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");
|