2 * MFD core driver for Ricoh RN5T618 PMIC
4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
10 * You should have received a copy of the GNU General Public License
11 * along with this program. If not, see <http://www.gnu.org/licenses/>.
14 #include <linux/i2c.h>
15 #include <linux/mfd/core.h>
16 #include <linux/mfd/rn5t618.h>
17 #include <linux/module.h>
18 #include <linux/regmap.h>
20 static const struct mfd_cell rn5t618_cells[] = {
21 { .name = "rn5t618-regulator" },
22 { .name = "rn5t618-wdt" },
25 static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
28 case RN5T618_WATCHDOGCNT:
30 case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
32 case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
35 case RN5T618_MON_IOIN:
43 static const struct regmap_config rn5t618_regmap_config = {
46 .volatile_reg = rn5t618_volatile_reg,
47 .max_register = RN5T618_MAX_REG,
48 .cache_type = REGCACHE_RBTREE,
51 static struct rn5t618 *rn5t618_pm_power_off;
53 static void rn5t618_power_off(void)
55 /* disable automatic repower-on */
56 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
57 RN5T618_REPCNT_REPWRON, 0);
58 /* start power-off sequence */
59 regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
60 RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
63 static int rn5t618_i2c_probe(struct i2c_client *i2c,
64 const struct i2c_device_id *id)
69 priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
73 i2c_set_clientdata(i2c, priv);
75 priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
76 if (IS_ERR(priv->regmap)) {
77 ret = PTR_ERR(priv->regmap);
78 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
82 ret = mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
83 ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
85 dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
90 rn5t618_pm_power_off = priv;
91 pm_power_off = rn5t618_power_off;
97 static int rn5t618_i2c_remove(struct i2c_client *i2c)
99 struct rn5t618 *priv = i2c_get_clientdata(i2c);
101 if (priv == rn5t618_pm_power_off) {
102 rn5t618_pm_power_off = NULL;
106 mfd_remove_devices(&i2c->dev);
110 static const struct of_device_id rn5t618_of_match[] = {
111 { .compatible = "ricoh,rn5t618" },
114 MODULE_DEVICE_TABLE(of, rn5t618_of_match);
116 static const struct i2c_device_id rn5t618_i2c_id[] = {
119 MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
121 static struct i2c_driver rn5t618_i2c_driver = {
124 .of_match_table = of_match_ptr(rn5t618_of_match),
126 .probe = rn5t618_i2c_probe,
127 .remove = rn5t618_i2c_remove,
128 .id_table = rn5t618_i2c_id,
131 module_i2c_driver(rn5t618_i2c_driver);
133 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
134 MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
135 MODULE_LICENSE("GPL v2");